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From: Douglas Otis <doug.mtview@gmail.com>
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Subject: [perpass] Avoiding abuse related to large scale encrypted email
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Dear Perpass WG,

Several have expressed valid concerns regarding abuse of encrypted =
email.  While CAs may not be trustworthy, it seems DANE offers a =
workable and reasonably transparent  alternative to protect against =
undetected tampering.  In addition, DANE reduces incremental costs =
associated with certificates which should prove beneficial for email =
use.

That said, proprietary schemes are available permitting multiple =
decoding keys derived from conveyed indexes.  The derived keys are =
assigned to outbound message scanners used by enterprises to ensure =
governmental data compliance requirements while also ensuring the =
integrity of the entire path traversed.  If there is interest, I could =
prevail on my employer to disclose IPR terms and details.

Secondly, while web based TLS exchanges normally ignore client =
certificates, this would not be desirable for StartTLS related to open =
email exchanges.  Currently, only source IP addresses are effectively =
used to defend SMTP servers.  DKIM does not offer a suitable replacement =
because it fails to capture who initiated the exchange, and to whom it =
was being sent.  In other words, DKIM lacks essential elements needed to =
properly identify those accountable for email abuse.

IPv6 will significantly challenge the use of source IP addresses.  While =
the number of legitimate addresses may represent a reasonable number, =
most of email is sourced from compromised systems likely using privacy =
extensions.  Just a bit map tracking whether a /64 prefix is active =
requires 5,650 Terra-bytes to cover just the announced /64 prefix space. =
 At any point in time, a bit more than 100 million registered domains =
are active that collapses down to subdomains below the registrar.  This =
relatively small number is fairly manageable compared against IP =
addresses, even when attempting to just white-list new MTAs.

A domain based approach may seem fairly disruptive, but even the best =
content scanners fail to provide full detections while demanding =
significant resources. Content based acceptance is not cost effective as =
the first stage in a vetting process.  One hundred thousand domains =
control 90% of the Internet traffic. The top 150 domains control 50%, =
and the top 2,500 domains control 75%.=20

Secure SMTP using DNS-Based Authentication of Named Entities (DANE) TLSA =
records and SMTP security via opportunistic DANE TLS offer interesting =
starting points.  For this to work well, a more disruptive approach is =
required where sending domains should be encouraged to use their own =
certificates.  The initial availability of TSLA RRs should not miss the =
opportunity to use this to signal a new paradigm of expectations.

Regards.
Douglas Otis


--Apple-Mail=_080A7D4B-AA9C-416B-910E-BE158EDB40DE
Content-Transfer-Encoding: quoted-printable
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	charset=us-ascii

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
"><div>Dear Perpass WG,</div><div><br></div><div>Several have expressed =
valid concerns regarding abuse of encrypted email. &nbsp;While CAs may =
not be trustworthy, it seems DANE offers a workable and reasonably =
transparent &nbsp;alternative to protect against undetected tampering. =
&nbsp;In addition, DANE reduces incremental costs associated with =
certificates which should prove beneficial for email =
use.</div><div><br></div><div>That said, proprietary schemes are =
available permitting multiple decoding keys derived from conveyed =
indexes. &nbsp;The derived keys are assigned to outbound message =
scanners used by enterprises to ensure&nbsp;governmental data compliance =
requirements&nbsp;while also ensuring the integrity of the entire path =
traversed. &nbsp;If there is interest, I could prevail on my employer to =
disclose IPR terms and details.</div><div><br></div><div>Secondly, while =
web based TLS exchanges normally ignore client certificates, this would =
not be desirable for StartTLS related to open email exchanges. =
&nbsp;Currently, only source IP addresses are effectively used to defend =
SMTP servers. &nbsp;DKIM does not offer a suitable replacement because =
it fails to capture who initiated the exchange, and to whom it was being =
sent. &nbsp;In other words, DKIM lacks essential elements needed to =
properly identify those accountable for email =
abuse.</div><div><br></div><div>IPv6 will significantly challenge the =
use of source IP addresses. &nbsp;While the number of legitimate =
addresses may represent a reasonable number, most of email is sourced =
from compromised systems likely using privacy extensions. &nbsp;Just a =
bit map tracking whether a /64 prefix is active requires&nbsp;5,650 =
Terra-bytes to cover just the announced /64 prefix space. &nbsp;At any =
point in time, a bit more than 100 million registered domains are active =
that collapses down to subdomains below the registrar. &nbsp;This =
relatively small number is fairly manageable compared against IP =
addresses, even when attempting to just white-list new =
MTAs.</div><div><br></div><div>A domain based approach may seem fairly =
disruptive, but even the best content scanners fail to provide full =
detections while demanding significant resources. Content based =
acceptance is not cost effective as the first stage in a vetting =
process. &nbsp;One hundred
        thousand domains control 90% of the Internet traffic. The top =
150 domains control 50%, and the top 2,500 domains
        control 75%.&nbsp;</div><div><br></div><div><a =
href=3D"http://tools.ietf.org/html/draft-ietf-dane-smtp">Secure SMTP =
using DNS-Based Authentication of Named Entities (DANE) TLSA =
records</a>&nbsp;and&nbsp;<a =
href=3D"http://tools.ietf.org/html/draft-dukhovni-smtp-opportunistic-tls">=
SMTP security via opportunistic DANE TLS</a>&nbsp;offer interesting =
starting points. &nbsp;For this to work well, a more disruptive approach =
is required where sending domains should be encouraged to use their own =
certificates. &nbsp;The initial availability of TSLA RRs should not miss =
the opportunity to use this to signal a new paradigm of =
expectations.</div><div><br></div><div>Regards.</div><div>Douglas =
Otis</div><div><br></div></body></html>=

--Apple-Mail=_080A7D4B-AA9C-416B-910E-BE158EDB40DE--

From stephen.farrell@cs.tcd.ie  Fri Oct  4 06:23:14 2013
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Subject: [perpass] perpass session in  Vancouver
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Hiya,

The IAB and IESG had our BoF call last week and approved
the perpass session. Scheduling is being discussed now
and a draft agenda for the overall IETF meeting is due
out soon, but as always don't plan any travel around that
until the agenda is final. (Planning for the spending the
entire week at the IETF is of course the best thing:-)

The goal of our session will be to level-set in terms
of what the IETF can realistically do, and then to
construct a list of actions (with willing victims:-)
that can be followed up in the IETF.

The draft agenda we're considering is below.

minutes - topic
0000 - intro, agenda bash
0010 - overview pressie
0040 - open mic, have we level-set?
0060 - threat model
0070 - hard and open topics
0080 - high level on more use of tls
0090 - privacy bcp
0100 - open mic, comments on pressies, what's missing?
0120 - summarise actions, open-points
0150 - end

Since our face to face time is limited and highly valuable,
we're aiming for these slot to discuss concrete and specific
things the IETF should be doing, that are tractable and where
we've some idea that someone is willing and able to do the
work. (We've got some folks who are willing to lead the
various bits of discussion so no need for now to offer to
do that.)

Spending too much time on how stuff works or how soemone
might have broken something is probably not the best use
of our time at this session.

Comments on the above draft agenda are welcome.

And we'll want good note-takers in addition, so if you're
willing to volunteer for that let Sean and I know.

Cheers,
S.

From paul@nohats.ca  Mon Oct  7 07:34:12 2013
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From: Paul Wouters <paul@nohats.ca>
To: Douglas Otis <doug.mtview@gmail.com>
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Subject: Re: [perpass] Avoiding abuse related to large scale encrypted email
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On Thu, 3 Oct 2013, Douglas Otis wrote:

> Several have expressed valid concerns regarding abuse of encrypted email.

One can always request encrypted email is signed. Than an abuser's key
can simply be blacklisted. Or all encrypted but not signed email can be
refused or disgarded. Encryption and key verification in DNS is actually
a really good anti-spammer tool.

> That said, proprietary schemes are available permitting multiple decoding keys derived from conveyed indexes.  The derived keys are
> assigned to outbound message scanners used by enterprises to ensure governmental data compliance requirements while also ensuring the
> integrity of the entire path traversed.  If there is interest, I could prevail on my employer to disclose IPR terms and details.

Generaly, I think people are only interested in hearing unencumbered
ideas. So unless your employer has license terms that are unrestricted,
I at least do not wish to hear it.

> Secondly, while web based TLS exchanges normally ignore client certificates, this would not be desirable for StartTLS related to open
> email exchanges.  Currently, only source IP addresses are effectively used to defend SMTP servers.

See above. If that is a concern, simply block encrypted but unsigned
email. Or only allow signed email if the public key is available in DNS.

> IPv6 will significantly challenge the use of source IP addresses.

Someone should tell Paul Vixie that, his ipv6 reverse check is
preventing me from emailing him on various occasions when my mail
client happens to get some v6 address :P

> Secure SMTP using DNS-Based Authentication of Named Entities (DANE) TLSA records and SMTP security via opportunistic DANE TLS offer
> interesting starting points.  For this to work well, a more disruptive approach is required where sending domains should be encouraged
> to use their own certificates.  The initial availability of TSLA RRs should not miss the opportunity to use this to signal a new
> paradigm of expectations.

I am not sure what you are saying here?

encryption is unrelated to authentication or authorization. spam and
verifiable email origin are unrelated to encrypted the content (and/or
meta data) of email. It just happens that we used to use the content
and/or metadata to mark bogus email as spam. Clearly that has to change
if we are successful at hiding those properties from passive attackers
as well as anti-spam technologies.

Paul

From rlb@ipv.sx  Mon Oct  7 12:09:21 2013
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Date: Mon, 7 Oct 2013 15:09:09 -0400
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Subject: Re: [perpass] Avoiding abuse related to large scale encrypted email
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--001a11c308e00ce71c04e82b638f
Content-Type: text/plain; charset=ISO-8859-1

On Mon, Oct 7, 2013 at 10:33 AM, Paul Wouters <paul@nohats.ca> wrote:

> On Thu, 3 Oct 2013, Douglas Otis wrote:
>
>  Several have expressed valid concerns regarding abuse of encrypted email.
>>
>
> One can always request encrypted email is signed. Than an abuser's key
> can simply be blacklisted. Or all encrypted but not signed email can be
> refused or disgarded. Encryption and key verification in DNS is actually
> a really good anti-spammer tool.


Note that this would require Encrypt-then-Sign or
Sign-then-Encrypt-then-Sign, either of which has some security implications.
<http://tools.ietf.org/html/rfc5751#section-3.6>

--Richard



>
>
>  That said, proprietary schemes are available permitting multiple decoding
>> keys derived from conveyed indexes.  The derived keys are
>> assigned to outbound message scanners used by enterprises to
>> ensure governmental data compliance requirements while also ensuring the
>> integrity of the entire path traversed.  If there is interest, I could
>> prevail on my employer to disclose IPR terms and details.
>>
>
> Generaly, I think people are only interested in hearing unencumbered
> ideas. So unless your employer has license terms that are unrestricted,
> I at least do not wish to hear it.
>
>
>  Secondly, while web based TLS exchanges normally ignore client
>> certificates, this would not be desirable for StartTLS related to open
>> email exchanges.  Currently, only source IP addresses are effectively
>> used to defend SMTP servers.
>>
>
> See above. If that is a concern, simply block encrypted but unsigned
> email. Or only allow signed email if the public key is available in DNS.
>
>
>  IPv6 will significantly challenge the use of source IP addresses.
>>
>
> Someone should tell Paul Vixie that, his ipv6 reverse check is
> preventing me from emailing him on various occasions when my mail
> client happens to get some v6 address :P
>
>
>  Secure SMTP using DNS-Based Authentication of Named Entities (DANE) TLSA
>> records and SMTP security via opportunistic DANE TLS offer
>> interesting starting points.  For this to work well, a more disruptive
>> approach is required where sending domains should be encouraged
>> to use their own certificates.  The initial availability of TSLA RRs
>> should not miss the opportunity to use this to signal a new
>> paradigm of expectations.
>>
>
> I am not sure what you are saying here?
>
> encryption is unrelated to authentication or authorization. spam and
> verifiable email origin are unrelated to encrypted the content (and/or
> meta data) of email. It just happens that we used to use the content
> and/or metadata to mark bogus email as spam. Clearly that has to change
> if we are successful at hiding those properties from passive attackers
> as well as anti-spam technologies.
>
> Paul
> ______________________________**_________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/**listinfo/perpass<https://www.ietf.org/mailman/listinfo/perpass>
>

--001a11c308e00ce71c04e82b638f
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Mon, Oct 7, 2013 at 10:33 AM, Paul Wouters <span dir=3D"ltr">&lt=
;<a href=3D"mailto:paul@nohats.ca" target=3D"_blank">paul@nohats.ca</a>&gt;=
</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div class=3D"im">On Thu, 3 Oct 2013, Douglas Otis wrote:<=
br>

<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
Several have expressed valid concerns regarding abuse of encrypted email.<b=
r>
</blockquote>
<br></div>
One can always request encrypted email is signed. Than an abuser&#39;s key<=
br>
can simply be blacklisted. Or all encrypted but not signed email can be<br>
refused or disgarded. Encryption and key verification in DNS is actually<br=
>
a really good anti-spammer tool.</blockquote><div><br></div><div>Note that =
this would require Encrypt-then-Sign or Sign-then-Encrypt-then-Sign, either=
 of which has some security implications.</div><div>&lt;<a href=3D"http://t=
ools.ietf.org/html/rfc5751#section-3.6">http://tools.ietf.org/html/rfc5751#=
section-3.6</a>&gt;</div>
<div><br></div><div>--Richard</div><div><br></div><div>=A0</div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:=
1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left=
:1ex">
<div class=3D"im"><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
That said, proprietary schemes are available permitting multiple decoding k=
eys derived from conveyed indexes. =A0The derived keys are<br>
assigned to outbound message scanners used by enterprises to ensure=A0gover=
nmental data compliance requirements=A0while also ensuring the<br>
integrity of the entire path traversed. =A0If there is interest, I could pr=
evail on my employer to disclose IPR terms and details.<br>
</blockquote>
<br></div>
Generaly, I think people are only interested in hearing unencumbered<br>
ideas. So unless your employer has license terms that are unrestricted,<br>
I at least do not wish to hear it.<div class=3D"im"><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
Secondly, while web based TLS exchanges normally ignore client certificates=
, this would not be desirable for StartTLS related to open<br>
email exchanges. =A0Currently, only source IP addresses are effectively use=
d to defend SMTP servers.<br>
</blockquote>
<br></div>
See above. If that is a concern, simply block encrypted but unsigned<br>
email. Or only allow signed email if the public key is available in DNS.<di=
v class=3D"im"><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
IPv6 will significantly challenge the use of source IP addresses.<br>
</blockquote>
<br></div>
Someone should tell Paul Vixie that, his ipv6 reverse check is<br>
preventing me from emailing him on various occasions when my mail<br>
client happens to get some v6 address :P<div class=3D"im"><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
Secure SMTP using DNS-Based Authentication of Named Entities (DANE) TLSA re=
cords=A0and=A0SMTP security via opportunistic DANE TLS=A0offer<br>
interesting starting points. =A0For this to work well, a more disruptive ap=
proach is required where sending domains should be encouraged<br>
to use their own certificates. =A0The initial availability of TSLA RRs shou=
ld not miss the opportunity to use this to signal a new<br>
paradigm of expectations.<br>
</blockquote>
<br></div>
I am not sure what you are saying here?<br>
<br>
encryption is unrelated to authentication or authorization. spam and<br>
verifiable email origin are unrelated to encrypted the content (and/or<br>
meta data) of email. It just happens that we used to use the content<br>
and/or metadata to mark bogus email as spam. Clearly that has to change<br>
if we are successful at hiding those properties from passive attackers<br>
as well as anti-spam technologies.<br>
<br>
Paul<br>
______________________________<u></u>_________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org" target=3D"_blank">perpass@ietf.org</a><=
br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/<u></u>listinfo/perpass</a><br>
</blockquote></div><br></div></div>

--001a11c308e00ce71c04e82b638f--

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References: <4C5C85B1-0DF1-4DFE-9F6D-DC2DEF512F8A@gmail.com> <alpine.LFD.2.10.1310071024540.4993@bofh.nohats.ca> <CAL02cgQNsR2=jPjkddQ4bLCvWNb0X2tOR3VE=ZkqcJyRFfWpCw@mail.gmail.com>
Date: Mon, 7 Oct 2013 16:07:02 -0400
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From: Phillip Hallam-Baker <hallam@gmail.com>
To: Richard Barnes <rlb@ipv.sx>
Content-Type: multipart/alternative; boundary=001a11c34e6c13c00c04e82c3275
Cc: perpass <perpass@ietf.org>, Paul Wouters <paul@nohats.ca>, Douglas Otis <doug.mtview@gmail.com>
Subject: Re: [perpass] Avoiding abuse related to large scale encrypted email
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On Mon, Oct 7, 2013 at 3:09 PM, Richard Barnes <rlb@ipv.sx> wrote:

>
>
>
> On Mon, Oct 7, 2013 at 10:33 AM, Paul Wouters <paul@nohats.ca> wrote:
>
>> On Thu, 3 Oct 2013, Douglas Otis wrote:
>>
>>  Several have expressed valid concerns regarding abuse of encrypted email.
>>>
>>
>> One can always request encrypted email is signed. Than an abuser's key
>> can simply be blacklisted. Or all encrypted but not signed email can be
>> refused or disgarded. Encryption and key verification in DNS is actually
>> a really good anti-spammer tool.
>
>
> Note that this would require Encrypt-then-Sign or
> Sign-then-Encrypt-then-Sign, either of which has some security implications.
> <http://tools.ietf.org/html/rfc5751#section-3.6>
>

Please be specific.

There is no consensus on the order of operations and never will be because
there are security considerations of doing it either way.

There are more options than S(E(m,k1),k2) or E(S(m,k2),k1) as well.

Encryption takes place under a session key and that session key can be used
to encrypt the hash or encrypt the message.

So be precise, it is really important here. One of the things that holds
the field back is that a lot of the time repetition of lore substitutes for
thinking.


The scheme I am currently working with has a policy layer so at the same
time the email recipient publishes their key they tell people how to use it
to send them mail.

This allows for constraints such as:

1) Always try to send me encrypted mail.

2) Only send encrypted mail on prior permission.

3) Encrypt data to my personal key

4) Encrypt data to the organization's key.

5) Encrypt data to my personal key, sign it and then super encrypt under
the enterprise key.


Pre-PRISM we used to argue about choice A or choice B.

What Bruce-who-has-seen-the-docs tells me is that when the NSA has that
choice their answer is always do both.

And we have to do the same if we are going to win this.

-- 
Website: http://hallambaker.com/

--001a11c34e6c13c00c04e82c3275
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Mon, Oct 7, 2013 at 3:09 PM, Richard Barnes <span dir=3D"ltr">&l=
t;<a href=3D"mailto:rlb@ipv.sx" target=3D"_blank">rlb@ipv.sx</a>&gt;</span>=
 wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><br><div class=3D"gmail_ext=
ra"><br><br><div class=3D"gmail_quote"><div class=3D"im">On Mon, Oct 7, 201=
3 at 10:33 AM, Paul Wouters <span dir=3D"ltr">&lt;<a href=3D"mailto:paul@no=
hats.ca" target=3D"_blank">paul@nohats.ca</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div>On Thu, 3 Oct 2013, Douglas Otis wrote:<br>

<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
Several have expressed valid concerns regarding abuse of encrypted email.<b=
r>
</blockquote>
<br></div>
One can always request encrypted email is signed. Than an abuser&#39;s key<=
br>
can simply be blacklisted. Or all encrypted but not signed email can be<br>
refused or disgarded. Encryption and key verification in DNS is actually<br=
>
a really good anti-spammer tool.</blockquote><div><br></div></div><div>Note=
 that this would require Encrypt-then-Sign or Sign-then-Encrypt-then-Sign, =
either of which has some security implications.</div><div>&lt;<a href=3D"ht=
tp://tools.ietf.org/html/rfc5751#section-3.6" target=3D"_blank">http://tool=
s.ietf.org/html/rfc5751#section-3.6</a>&gt;</div>
</div></div></div></blockquote><div><br></div><div>Please be specific.=A0</=
div><div><br></div><div>There is no consensus on the order of operations an=
d never will be because there are security considerations of doing it eithe=
r way. =A0</div>
</div><div><br></div><div>There are more options than S(E(m,k1),k2) or E(S(=
m,k2),k1) as well.</div><div><br></div><div>Encryption takes place under a =
session key and that session key can be used to encrypt the hash or encrypt=
 the message.</div>
<div><br></div><div>So be precise, it is really important here. One of the =
things that holds the field back is that a lot of the time repetition of lo=
re substitutes for thinking.</div><div><br></div><div><br></div><div>The sc=
heme I am currently working with has a policy layer so at the same time the=
 email recipient publishes their key they tell people how to use it to send=
 them mail.=A0</div>
<div><br></div><div>This allows for constraints such as:</div><div><br></di=
v><div>1) Always try to send me encrypted mail.</div><div><br></div><div>2)=
 Only send encrypted mail on prior permission.</div><div><br></div><div>
3) Encrypt data to my personal key=A0</div><div><br></div><div>4) Encrypt d=
ata to the organization&#39;s key.</div><div><br></div><div>5) Encrypt data=
 to my personal key, sign it and then super encrypt under the enterprise ke=
y.</div>
<div><br></div><div><br></div><div>Pre-PRISM we used to argue about choice =
A or choice B.=A0</div><div><br></div><div>What Bruce-who-has-seen-the-docs=
 tells me is that when the NSA has that choice their answer is always do bo=
th.</div>
<div><br></div><div>And we have to do the same if we are going to win this.=
</div><div><br></div>-- <br>Website: <a href=3D"http://hallambaker.com/">ht=
tp://hallambaker.com/</a><br>
</div></div>

--001a11c34e6c13c00c04e82c3275--

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References: <4C5C85B1-0DF1-4DFE-9F6D-DC2DEF512F8A@gmail.com> <alpine.LFD.2.10.1310071024540.4993@bofh.nohats.ca> <CAL02cgQNsR2=jPjkddQ4bLCvWNb0X2tOR3VE=ZkqcJyRFfWpCw@mail.gmail.com> <CAMm+LwiyBQ-JCA4ff-v9eOe1=tPPyjsbNK6=V+bM945pgja9_g@mail.gmail.com>
Date: Mon, 7 Oct 2013 16:45:46 -0400
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From: Richard Barnes <rlb@ipv.sx>
To: Phillip Hallam-Baker <hallam@gmail.com>
Content-Type: multipart/alternative; boundary=089e01538bc48d6d5a04e82cbc5d
Cc: perpass <perpass@ietf.org>, Paul Wouters <paul@nohats.ca>, Douglas Otis <doug.mtview@gmail.com>
Subject: Re: [perpass] Avoiding abuse related to large scale encrypted email
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--089e01538bc48d6d5a04e82cbc5d
Content-Type: text/plain; charset=ISO-8859-1

I'm not proposing anything new here.  My point was simply that if
anti-abuse requires the sender's key is on the outside, then it rules out
some schemes.  Namely any scheme where the signature only exists within an
encrypted segment (e.g., your E(S(m,k2),k1)).  This limitation could be
considered an undesirable side-effect of Paul's proposal to use the
signature for anti-abuse.

--Richard


On Mon, Oct 7, 2013 at 4:07 PM, Phillip Hallam-Baker <hallam@gmail.com>wrote:

>
>
>
> On Mon, Oct 7, 2013 at 3:09 PM, Richard Barnes <rlb@ipv.sx> wrote:
>
>>
>>
>>
>> On Mon, Oct 7, 2013 at 10:33 AM, Paul Wouters <paul@nohats.ca> wrote:
>>
>>> On Thu, 3 Oct 2013, Douglas Otis wrote:
>>>
>>>  Several have expressed valid concerns regarding abuse of encrypted
>>>> email.
>>>>
>>>
>>> One can always request encrypted email is signed. Than an abuser's key
>>> can simply be blacklisted. Or all encrypted but not signed email can be
>>> refused or disgarded. Encryption and key verification in DNS is actually
>>> a really good anti-spammer tool.
>>
>>
>> Note that this would require Encrypt-then-Sign or
>> Sign-then-Encrypt-then-Sign, either of which has some security implications.
>> <http://tools.ietf.org/html/rfc5751#section-3.6>
>>
>
> Please be specific.
>
> There is no consensus on the order of operations and never will be because
> there are security considerations of doing it either way.
>
> There are more options than S(E(m,k1),k2) or E(S(m,k2),k1) as well.
>
> Encryption takes place under a session key and that session key can be
> used to encrypt the hash or encrypt the message.
>
> So be precise, it is really important here. One of the things that holds
> the field back is that a lot of the time repetition of lore substitutes for
> thinking.
>
>
> The scheme I am currently working with has a policy layer so at the same
> time the email recipient publishes their key they tell people how to use it
> to send them mail.
>
> This allows for constraints such as:
>
> 1) Always try to send me encrypted mail.
>
> 2) Only send encrypted mail on prior permission.
>
> 3) Encrypt data to my personal key
>
> 4) Encrypt data to the organization's key.
>
> 5) Encrypt data to my personal key, sign it and then super encrypt under
> the enterprise key.
>
>
> Pre-PRISM we used to argue about choice A or choice B.
>
> What Bruce-who-has-seen-the-docs tells me is that when the NSA has that
> choice their answer is always do both.
>
> And we have to do the same if we are going to win this.
>
> --
> Website: http://hallambaker.com/
>

--089e01538bc48d6d5a04e82cbc5d
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">I&#39;m not proposing anything new here. =A0My point was s=
imply that if anti-abuse requires the sender&#39;s key is on the outside, t=
hen it rules out some schemes. =A0Namely any scheme where the signature onl=
y exists within an encrypted segment (e.g., your=A0<span style=3D"font-fami=
ly:arial,sans-serif;font-size:13px">E(S(m,k2),k1)</span>). =A0This limitati=
on could be considered an=A0undesirable side-effect of Paul&#39;s proposal =
to use the signature for anti-abuse.<div>
<br></div><div>--Richard</div></div><div class=3D"gmail_extra"><br><br><div=
 class=3D"gmail_quote">On Mon, Oct 7, 2013 at 4:07 PM, Phillip Hallam-Baker=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:hallam@gmail.com" target=3D"_blank=
">hallam@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><br><div class=3D"gmail_ext=
ra"><br><br><div class=3D"gmail_quote"><div class=3D"im">On Mon, Oct 7, 201=
3 at 3:09 PM, Richard Barnes <span dir=3D"ltr">&lt;<a href=3D"mailto:rlb@ip=
v.sx" target=3D"_blank">rlb@ipv.sx</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><br><div class=3D"gmail_ext=
ra"><br><br><div class=3D"gmail_quote"><div>On Mon, Oct 7, 2013 at 10:33 AM=
, Paul Wouters <span dir=3D"ltr">&lt;<a href=3D"mailto:paul@nohats.ca" targ=
et=3D"_blank">paul@nohats.ca</a>&gt;</span> wrote:<br>


<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div>On Thu, 3 Oct 2013, Douglas Otis wrote:<br>

<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
Several have expressed valid concerns regarding abuse of encrypted email.<b=
r>
</blockquote>
<br></div>
One can always request encrypted email is signed. Than an abuser&#39;s key<=
br>
can simply be blacklisted. Or all encrypted but not signed email can be<br>
refused or disgarded. Encryption and key verification in DNS is actually<br=
>
a really good anti-spammer tool.</blockquote><div><br></div></div><div>Note=
 that this would require Encrypt-then-Sign or Sign-then-Encrypt-then-Sign, =
either of which has some security implications.</div><div>&lt;<a href=3D"ht=
tp://tools.ietf.org/html/rfc5751#section-3.6" target=3D"_blank">http://tool=
s.ietf.org/html/rfc5751#section-3.6</a>&gt;</div>

</div></div></div></blockquote><div><br></div></div><div>Please be specific=
.=A0</div><div><br></div><div>There is no consensus on the order of operati=
ons and never will be because there are security considerations of doing it=
 either way. =A0</div>

</div><div><br></div><div>There are more options than S(E(m,k1),k2) or E(S(=
m,k2),k1) as well.</div><div><br></div><div>Encryption takes place under a =
session key and that session key can be used to encrypt the hash or encrypt=
 the message.</div>

<div><br></div><div>So be precise, it is really important here. One of the =
things that holds the field back is that a lot of the time repetition of lo=
re substitutes for thinking.</div><div><br></div><div><br></div><div>The sc=
heme I am currently working with has a policy layer so at the same time the=
 email recipient publishes their key they tell people how to use it to send=
 them mail.=A0</div>

<div><br></div><div>This allows for constraints such as:</div><div><br></di=
v><div>1) Always try to send me encrypted mail.</div><div><br></div><div>2)=
 Only send encrypted mail on prior permission.</div><div><br></div><div>

3) Encrypt data to my personal key=A0</div><div><br></div><div>4) Encrypt d=
ata to the organization&#39;s key.</div><div><br></div><div>5) Encrypt data=
 to my personal key, sign it and then super encrypt under the enterprise ke=
y.</div>

<div><br></div><div><br></div><div>Pre-PRISM we used to argue about choice =
A or choice B.=A0</div><div><br></div><div>What Bruce-who-has-seen-the-docs=
 tells me is that when the NSA has that choice their answer is always do bo=
th.</div>

<div><br></div><div>And we have to do the same if we are going to win this.=
</div><span class=3D"HOEnZb"><font color=3D"#888888"><div><br></div>-- <br>=
Website: <a href=3D"http://hallambaker.com/" target=3D"_blank">http://halla=
mbaker.com/</a><br>

</font></span></div></div>
</blockquote></div><br></div>

--089e01538bc48d6d5a04e82cbc5d--

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Subject: Re: [perpass] Avoiding abuse related to large scale encrypted email
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--089e01229a585cddb004e82cd0db
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On Mon, Oct 7, 2013 at 7:33 AM, Paul Wouters <paul@nohats.ca> wrote:

> On Thu, 3 Oct 2013, Douglas Otis wrote:
>
>  Several have expressed valid concerns regarding abuse of encrypted email.
>>
>
> One can always request encrypted email is signed.



FWIW,

Pond's use of group signatures (with traceability) for anti-abuse is a very
clever idea along these lines, and avoids some of the disadvantages (e.g.
loss of deniability and anonymity) of traditional public-key signatures.

https://pond.imperialviolet.org/tech.html

Trevor

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Mon, Oct 7, 2013 at 7:33 AM, Paul Wouters <span dir=3D"ltr">&lt;=
<a href=3D"mailto:paul@nohats.ca" target=3D"_blank">paul@nohats.ca</a>&gt;<=
/span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div class=3D"im">On Thu, 3 Oct 2013, Douglas Otis wrote:<=
br>

<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
Several have expressed valid concerns regarding abuse of encrypted email.<b=
r>
</blockquote>
<br></div>
One can always request encrypted email is signed.</blockquote><div><br></di=
v><div><div><br class=3D"">FWIW,</div><div><br></div><div>Pond&#39;s use of=
 group signatures (with traceability) for anti-abuse is a very clever idea =
along these lines, and avoids some of the disadvantages (e.g. loss of denia=
bility and anonymity) of traditional public-key signatures.</div>
<div><br></div><div><a href=3D"https://pond.imperialviolet.org/tech.html">h=
ttps://pond.imperialviolet.org/tech.html</a><br></div><div><br></div><div>T=
revor</div></div><div><br></div></div></div></div>

--089e01229a585cddb004e82cd0db--

From stephen.farrell@cs.tcd.ie  Tue Oct  8 04:56:35 2013
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Folks,

Preliminary agenda for the IETF is out [1] with this
session slated for Wed 1pm. That could change but
frankly I doubt it given the constraints for this
one. (But don't blame me if it does:-) Our session
will be preceeded by a tech-plenary Wed morning
that'll also discuss this topic, but (I hope:-) at
a higher level. (That's also described in [1] and
is why our session is unlikely to move.)

I've yet to see any comment on this agenda and am
underwhelmed with volunteers for scribing etc. Be
nice if those both changed...

Cheers,
S.

[1] https://datatracker.ietf.org/meeting/88/agenda.html

On 10/04/2013 02:12 PM, Stephen Farrell wrote:
> 
> Hiya,
> 
> The IAB and IESG had our BoF call last week and approved
> the perpass session. Scheduling is being discussed now
> and a draft agenda for the overall IETF meeting is due
> out soon, but as always don't plan any travel around that
> until the agenda is final. (Planning for the spending the
> entire week at the IETF is of course the best thing:-)
> 
> The goal of our session will be to level-set in terms
> of what the IETF can realistically do, and then to
> construct a list of actions (with willing victims:-)
> that can be followed up in the IETF.
> 
> The draft agenda we're considering is below.
> 
> minutes - topic
> 0000 - intro, agenda bash
> 0010 - overview pressie
> 0040 - open mic, have we level-set?
> 0060 - threat model
> 0070 - hard and open topics
> 0080 - high level on more use of tls
> 0090 - privacy bcp
> 0100 - open mic, comments on pressies, what's missing?
> 0120 - summarise actions, open-points
> 0150 - end
> 
> Since our face to face time is limited and highly valuable,
> we're aiming for these slot to discuss concrete and specific
> things the IETF should be doing, that are tractable and where
> we've some idea that someone is willing and able to do the
> work. (We've got some folks who are willing to lead the
> various bits of discussion so no need for now to offer to
> do that.)
> 
> Spending too much time on how stuff works or how soemone
> might have broken something is probably not the best use
> of our time at this session.
> 
> Comments on the above draft agenda are welcome.
> 
> And we'll want good note-takers in addition, so if you're
> willing to volunteer for that let Sean and I know.
> 
> Cheers,
> S.
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

From nweaver@icsi.berkeley.edu  Tue Oct  8 10:18:38 2013
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I've been a big advocate on the DNSSEC related lists that "Eh, the =
recursive resolver is the enemy, so validate on the client and don't =
bother validating on the recursive resolver". =20

With the recent revelation that the NSA/GCHQ is doing =
packet-injection/man-on-the-side attacks on the backbone, at scale, and =
even using this to target NATO allies, I've changed my tune.  Even =
forget about NSA/GCHQ directly, they've now implicitly said that "hey, =
its OK" for everyone else to do it, too.

Backbone DNS injection allows converting a man-on-the-side attacker =
(who, eg, even with a certificate, can't intercept TLS using perfect =
forward secrecy, and who when attacking HTTP directly can only see =
requests before deciding what to do) into a full man-in-the-middle, as =
long as the attacker knows the target's recursive resolver.


Thus I've changed my tune:

1:  Recursive resolvers MUST validate DNSSEC as well as clients.  Not =
because I trust the recursive resolver, but there is now an adversary =
set where recursive resolver validation does help, and its an easier =
point to do.

2:  Validation failures due to bad signatures/etc MUST result in a =
failure unless specifically whitelisted.

3:  Future protocols MUST support "Connect by multiple name" semantics:  =
Given MULTIPLE names, only connect if all K names have the same IP after =
resolution.  This enables multiple-validation-path DNSSEC, which is a =
pretty unique feature of DNSSEC.  I may not trust Verisign/NSA.  I =
certainly do not trust the Russians.  But I can probably trust that .com =
and .ru won't be subverted by the same parties.



--
Nicholas Weaver                  it is a tale, told by an idiot,
nweaver@icsi.berkeley.edu                full of sound and fury,
510-666-2903                                 .signifying nothing
PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub.asc


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From paul@cypherpunks.ca  Tue Oct  8 11:21:37 2013
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Subject: Re: [perpass] perpass session in  Vancouver
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On Tue, 8 Oct 2013, Stephen Farrell wrote:

> I've yet to see any comment on this agenda and am
> underwhelmed with volunteers for scribing etc. Be
> nice if those both changed...

Happy to scribe. Happy to talk about some brainstorming that
has happened since last IETF regarding IPsec OE and DNSSEC.

Paul

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Dean,

Here are responses to your comments:

  

Too bad. We can try to minimize the impact, but a net that gets you killed because
the wrong person heard you say the wrong thing is worse than one with slightly less bandwidth or temporal QoS.â€

  

I'm not sure I understand the context of your assertion re use of deadly 
force. I assume you don't
mean to suggest that many/most Internet users are in physical jeopardy 
as a result of nation state surveillance, right? Is your argument that 
_every_ user of the Internet should incur performance and convenience 
penalties to provide cover for the very, very tiny fraction of users who 
are in real, physical jeopardy as a result of such surveillance? I donâ€™t 
think that those of us who develop Internet standards are in a position 
to make such tradeoffs.


There are legitimate concerns that arise if we push the envelope wrt 
traffic flow security on
a wide scale basis, e.g., bandwidth consumption (especially in mobile 
environments), battery power , user-perceptible performance (traffic 
engineering based on traffic type), and even reliability (load balancing 
performed by devices not so close to servers.) Thatâ€™s why Iâ€™m 
comfortable offering mandatory-to-implement security features in 
standards, but not mandatory-to-use security features.

Perhaps. But unless one accepts it as a principle, one is doomed to build
surveillance-friendly networks.

  

I guess we disagree about the relative threats to personal privacy, and how such threats
are perceived by most users. I base my perception of the security-privacy vs. convenience and
performance tradeoff based on online habits in contexts where folks clearly
sacrifice privacy to commercial concerns on a massive basis.

  

  

I've been enterprise IT. And enterprise security. Most of their security problems
come form their own people abusing the loopholes. Sure, the IT department is lazy.
But once the "generally accepted best practices" require e2e, they'll play along. remember,
corporate policies are driven by generally accepted best practices such as GAAP for
accounting.   Note that, at least under US law, the management of a corporation is subject
to legal attacks from shareholders for losses related to the failure to deploy generally
accepted best practices for information security.

  

I agree that companies do tend to follow the heard, for the reasons you suggest. But, that does
not mean that we are in a position to tell enterprises that their concerns wrt monitoring
internal traffic, debugging, etc. are less important that a (well-intentioned) desire to thwart
surveillance at a global level. Again, it's the mandatory-to-use vs. implement issue.

  

A listing of best practies [sic] is here:   
http://www.wpi.edu/academics/CCC/Policies/bestpractices.html   

  

Note that they're written by people like CDT (an officer of which edited our privacy RFC),
NIST, and other bodies that we influence.

  

The IETF does not generally influence NIST or most of the other organizations that are sources
for the cited documents. (The IETF has often adopted NIST standards for our security RFCs.) Also,
the WPI URL lists security best practices documents from dozens of sources, not just NIST or CDT.

  

Should it? Who funds BBN, anyhow? What's your motivation for making choices that increase
surveillance?    

  

I'm pretty sure we get all our money from the GFF (Good Funding Fairy)  ;-).

I have no idea what triggered this nasty comment in response to my observation that we have offered
TFS options (e.g., in ESP) that have never been used. I was the designer of the TFS features of
ESP, so itâ€™s absurd for you to suggest that I am â€œmaking choices that increase surveillance.â€

  

Yeah, that's an ad hominem attack . But we're going to get a lot of those, and need to have
a great deal of confidence in our answers. "Nobody wants security" is probably not a good
enough answer â€¦ Nor is "Security costs too much", especially until the costs have been
more completely quantified -- including the costs of making systems that nobody will buy
because they don't want to spill their guts to our friends at Meade. Even the least suspicion
of pro-surveillance bias needs to be avoided for the results to be credible.

  

So, your reasoning appears to be that, because â€œweâ€ may the target of future ad hominem attacks,
you are justified in engaging in one now. Do you now what a non sequitur is?

  

Ah yes, the old "if we build E2E, nobody will use it" argument. I find that to be an
extremely suspicious argument, but recognize it and its kin have, for many years, led
us down a rabbit-warren of bad choices, resulting in the problem we have today.

  

I am the author of several standards (e.g., RFC 4301, 4302, 4303) that enable e-t-e security.
If I didn't hope people would make use of such technology I would not have spent a lot of time
on these documents. You state that you find my comments with  respect to use of security â€œsuspicious.â€
I find your comments about an absolute need to impose  Internet standards that mandate_use_  of
security to be amazingly hubristic, especially from someone with NO security RFCs to his credit.

  

Regrettably, and as a former Cisco employee, I can tell you that folks there also face
certain pressures from state actors. I'm sure this is true of most folks. David may be a
saint. He might be a devil. But as an external party lacking the expertise, I have no way of
telling if his position is biased against my objectives.   

  

I agree that you are â€œan external party lacking expertise.â€

  

So unless we have widespread review, from people likely to be in the influence of multiple
and conflicting actors, we really haven't had a review. How widespread? I'm not exactly sure
-- but it means more than one review, from more than one company, from more than one sector,
and from more than one nation-state at a minimum. Trust is really hard; our best substitute
is a very widespread consensus.    

  

I review a fair number of security-themed papers for journals every year. Most are terrible.
I don't think the IETF needs inputs from folks like he authors of those papers. â€œVery
widespread consensusâ€ is not a substitute for high quality review by competent people. But, this
aspects of our discussion is largely irrelevant, since the IETF process does acquire inputs
from a wide range of folks as we evaluate and progress standards.

  

Arguably, the mode that we've operated in for many years has given us a rather bad current
situation. Perhaps we should reassess "good enough".

  

IWe have standardized a pretty reasonable set of security mechanisms, many of which are
either not used or have been badly implemented, or both. Some of the sources of significant
vulnerabilities have arisen because of decisions by actors external to the IETF, e.g., vendors and
service providers, for business reasons. (One good example is provided by he PKI trust model
implemented in browsers, but there are many, many more examples.)

Could we do better? Yes, in some areas we could have better standards.

Should we mandate_use_  of additional, possibly burdensome security mechanisms by
all Internet users? I think not.

Steve



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    Dean,<br>
    <pre>
Here are responses to your comments:<o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">Too bad. We can try to minimize the impact, but a net that gets you killed because 
the wrong person heard you say the wrong thing is worse than one with slightly less bandwidth or temporal QoS.â€<o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <p class="MsoNormal"><span
        style="font-size:10.0pt;font-family:Courier">I'm not sure I
        understand the context of your assertion re use of deadly force.
        I assume you don't<br>
        mean to suggest that many/most Internet users are in physical
        jeopardy as a result of nation state surveillance, right? Is
        your argument that <u>every</u> user of the Internet should
        incur performance and convenience penalties to provide cover for
        the very, very tiny fraction of users who are in real, physical
        jeopardy as a result of such surveillance? I donâ€™t think that
        those of us who develop Internet standards are in a position to
        make such tradeoffs. <br>
      </span></p>
    <p class="MsoNormal"><span
        style="font-size:10.0pt;font-family:Courier"><br>
        There are legitimate concerns that arise if we push the envelope
        wrt traffic flow security on<br>
        a wide scale basis, e.g., bandwidth consumption (especially in
        mobile environments), battery power , user-perceptible
        performance (traffic engineering based on traffic type), and
        even reliability (load balancing performed by devices not so
        close to servers.) Thatâ€™s why Iâ€™m comfortable offering
        mandatory-to-implement security features in standards, but not
        mandatory-to-use security features.<o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-size:10.0pt;font-family:Courier"><o:p>Â </o:p></span></p>
    <pre style="margin-left:.5in">Perhaps. But unless one accepts it as a principle, one is doomed to build 
surveillance-friendly networks.<o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre>I guess we disagree about the relative threats to personal privacy, and how such threats 
are perceived by most users. I base my perception of the security-privacy vs. convenience and 
performance tradeoff based on online habits in contexts where folks clearly
sacrifice privacy to commercial concerns on a massive basis. <o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">I've been enterprise IT. And enterprise security. Most of their security problems 
come form their own people abusing the loopholes. Sure, the IT department is lazy. 
But once the "generally accepted best practices" require e2e, they'll play along. remember,
corporate policies are driven by generally accepted best practices such as GAAP for 
accounting.<span style="mso-spacerun:yes">Â  </span>Note that, at least under US law, the management of a corporation is subject 
to legal attacks from shareholders for losses related to the failure to deploy generally 
accepted best practices for information security.<o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre>I agree that companies do tend to follow the heard, for the reasons you suggest. But, that does 
not mean that we are in a position to tell enterprises that their concerns wrt monitoring 
internal traffic, debugging, etc. are less important that a (well-intentioned) desire to thwart 
surveillance at a global level. Again, it's the mandatory-to-use vs. implement issue.<o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">A listing of best practies [sic] is here:<span style="mso-spacerun:yes">Â  
</span><a class="moz-txt-link-freetext" href="http://www.wpi.edu/academics/CCC/Policies/bestpractices.html">http://www.wpi.edu/academics/CCC/Policies/bestpractices.html</a><span style="mso-spacerun:yes">Â  </span><o:p></o:p></pre>
    <pre style="margin-left:.5in"><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">Note that they're written by people like CDT (an officer of which edited our privacy RFC),
NIST, and other bodies that we influence. <o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre>The IETF does not generally influence NIST or most of the other organizations that are sources 
for the cited documents. (The IETF has often adopted NIST standards for our security RFCs.) Also, 
the WPI URL lists security best practices documents from dozens of sources, not just NIST or CDT.<o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">Should it? Who funds BBN, anyhow? What's your motivation for making choices that increase
surveillance?<span style="mso-spacerun:yes">Â Â  </span><o:p></o:p></pre>
    <pre style="margin-left:.5in"><o:p>Â </o:p></pre>
    <pre>I'm pretty sure we get all our money from the GFF (Good Funding Fairy) <span class="moz-smiley-s3"><span> ;-) </span></span>. 

I have no idea what triggered this nasty comment in response to my observation that we have offered 
TFS options (e.g., in ESP) that have never been used. I was the designer of the TFS features of 
ESP, so itâ€™s absurd for you to suggest that I am â€œmaking choices that increase surveillance.â€ <o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">Yeah, that's an ad hominem attack . But we're going to get a lot of those, and need to have 
a great deal of confidence in our answers. "Nobody wants security" is probably not a good 
enough answer â€¦ Nor is "Security costs too much", especially until the costs have been 
more completely quantified -- including the costs of making systems that nobody will buy 
because they don't want to spill their guts to our friends at Meade. Even the least suspicion 
of pro-surveillance bias needs to be avoided for the results to be credible.<o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre>So, your reasoning appears to be that, because â€œweâ€ may the target of future ad hominem attacks, 
you are justified in engaging in one now. Do you now what a non sequitur is? <o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">Ah yes, the old "if we build E2E, nobody will use it" argument. I find that to be an 
extremely suspicious argument, but recognize it and its kin have, for many years, led 
us down a rabbit-warren of bad choices, resulting in the problem we have today.<o:p></o:p></pre>
    <pre> <o:p></o:p></pre>
    <pre>I am the author of several standards (e.g., RFC 4301, 4302, 4303) that enable e-t-e security. 
If I didn't hope people would make use of such technology I would not have spent a lot of time 
on these documents. You state that you find my comments with  respect to use of security â€œsuspicious.â€ 
I find your comments about an absolute need to impose  Internet standards that mandate <u>use</u> of 
security to be amazingly hubristic, especially from someone with NO security RFCs to his credit.<o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">Regrettably, and as a former Cisco employee, I can tell you that folks there also face 
certain pressures from state actors. I'm sure this is true of most folks. David may be a 
saint. He might be a devil. But as an external party lacking the expertise, I have no way of 
telling if his position is biased against my objectives.<span style="mso-spacerun:yes">Â  </span><o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre>I agree that you are â€œan external party lacking expertise.â€<o:p></o:p></pre>
    <pre style="margin-left:.5in"><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">So unless we have widespread review, from people likely to be in the influence of multiple 
and conflicting actors, we really haven't had a review. How widespread? I'm not exactly sure 
-- but it means more than one review, from more than one company, from more than one sector, 
and from more than one nation-state at a minimum. Trust is really hard; our best substitute 
is a very widespread consensus.<span style="mso-spacerun:yes">Â Â  </span><o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre>I review a fair number of security-themed papers for journals every year. Most are terrible.
I don't think the IETF needs inputs from folks like he authors of those papers. â€œVery 
widespread consensusâ€ is not a substitute for high quality review by competent people. But, this 
aspects of our discussion is largely irrelevant, since the IETF process does acquire inputs 
from a wide range of folks as we evaluate and progress standards. <o:p></o:p></pre>
    <pre style="margin-left:.5in"><o:p>Â </o:p></pre>
    <pre style="margin-left:.5in">Arguably, the mode that we've operated in for many years has given us a rather bad current 
situation. Perhaps we should reassess "good enough". <o:p></o:p></pre>
    <pre><o:p>Â </o:p></pre>
    <pre>IWe have standardized a pretty reasonable set of security mechanisms, many of which are 
either not used or have been badly implemented, or both. Some of the sources of significant 
vulnerabilities have arisen because of decisions by actors external to the IETF, e.g., vendors and 
service providers, for business reasons. (One good example is provided by he PKI trust model 
implemented in browsers, but there are many, many more examples.) 

Could we do better? Yes, in some areas we could have better standards. 

Should we mandate <u>use</u> of additional, possibly burdensome security mechanisms by 
all Internet users? I think not.

Steve<o:p></o:p></pre>
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From stephen.farrell@cs.tcd.ie  Tue Oct  8 14:06:24 2013
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On 09/13/2013 06:12 PM, Dean Willis wrote:
> Yeah, that's an ad hominem attack .

Oops. Sorry Steve, my fault for not noticing that in Dean's
mail from a few weeks ago. Dean, please desist from ad-hominen
attacks.

And I figure this particular thread has run its course in
terms of being productive. (A new thread on the issue of
MTI vs mandatory-to-use-or-similar would be interesting
though.)

Thanks,
S.





From stephen.farrell@cs.tcd.ie  Tue Oct  8 14:14:37 2013
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Hi,

Steve's mail argues for the current IETF position that
mandatory-to-implement (MTI) is the correct target IETF
specifications.

Some folks (me included to be honest) wonder if the current
situation argues for raising the bar there somewhat on the
basis that MTI security features are frequently turned off
or not sufficiently well tested to be usable. (Pick your
favourite example, mine are usually rfc4744 or Diameter
being run in clear.) And an upshot from that is that that
helps those who want to pervasively monitor everything.

Others argue that that'd be the IETF straying into the
space of policy - all we should do is define how to use
strong security features and make sure the code is there so
they can be turned on and the rest is policy.

I'm sure there are loads more arguments, and I do think
it'd be useful to see those discussed here.

Thanks,
Stephen.

PS: Our -00 privacy BCP doesn't go beyond MTI for now, but
were there consensus for that, I think it'd be good if we
could go further.



From jon.peterson@neustar.biz  Tue Oct  8 15:24:05 2013
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From: "Peterson, Jon" <jon.peterson@neustar.biz>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, perpass <perpass@ietf.org>
Thread-Topic: [perpass] mandatory-to-implement vs. more?
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Moving the bar from MTI to mandatory-to-use (can we overload the acronym
MTU?) goes beyond just questions of policy, and into the questions of how
we build consensus and what the shapes the output of our engineering
process.

Just to take an example I've followed a bit, SIP is relatively successful
IETF protocol. It has some notable security issues. We could have designed
SIP in a way that reduced the ability of middlemen to work themselves into
the path of SIP messages, and thus reduced the potential for eavesdropping
on the sessions that SIP creates - and its usefulness as a tool of
surveillance.

Had we made some of those design decisions, however, it's unclear to me
that SIP would have been such a successful protocol. But we wouldn't have
made those decisions anyway, because the relevant documents would never
have garnered consensus in the working groups. Our consensus process
reflects the aggregate of the requirements of our participants, which come
from many sources: employers, or regulators, or academic interests, or
personal consciences.

If we had designed SIP to be a protocol that didn't meet those
requirements, of course it wouldn't see much deployment. Extensions to SIP
that have leaned in this direction have had little impact on the
protocol's use. That is the purpose of a consensus process, to reflect the
likely implementation and deployment community. Like it or not, the
participants in our consensus process want protocols like SIP to be
modifiable by intermediaries for numerous reasons - and once we open that
door, we have to understand it will be open for all comers.

We could change our process so that it overrides consensus on some of
these crucial points. I think it would be safe to say that we already do
so, in a limited way, as a results of various forms of cross-area review.
As popular protocol go through our process, we levy requirements that are
winked at by document authors and ignored by implementers. There are
however lines here we could cross that would result in nothing but the
severing of IETF work from the reality of deployment. That would not serve
our mission of making the Internet better.

We undoubtedly need to make changes to reflect our new understanding of
the threats facing the Internet. I think this needs to come from the
bottom up, though, not from the top down. I am heartened that our
consensus process has elevated core security mechanisms to
mandatory-to-use level for some recent work, like in RTCWeb. We need to
shed the brightest light we can on these issues, educate the community
about the new risks and the practical countermeasures, and then execute
our consensus process as we always have. In some cases, mandatory-to-use
will be the right choice. In others, it won't.

Jon Peterson
Neustar, Inc.

On 10/8/13 2:14 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote:

>
>Hi,
>
>Steve's mail argues for the current IETF position that
>mandatory-to-implement (MTI) is the correct target IETF
>specifications.
>
>Some folks (me included to be honest) wonder if the current
>situation argues for raising the bar there somewhat on the
>basis that MTI security features are frequently turned off
>or not sufficiently well tested to be usable. (Pick your
>favourite example, mine are usually rfc4744 or Diameter
>being run in clear.) And an upshot from that is that that
>helps those who want to pervasively monitor everything.
>
>Others argue that that'd be the IETF straying into the
>space of policy - all we should do is define how to use
>strong security features and make sure the code is there so
>they can be turned on and the rest is policy.
>
>I'm sure there are loads more arguments, and I do think
>it'd be useful to see those discussed here.
>
>Thanks,
>Stephen.
>
>PS: Our -00 privacy BCP doesn't go beyond MTI for now, but
>were there consensus for that, I think it'd be good if we
>could go further.
>
>
>_______________________________________________
>perpass mailing list
>perpass@ietf.org
>https://www.ietf.org/mailman/listinfo/perpass


From brian.e.carpenter@gmail.com  Tue Oct  8 16:03:06 2013
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On 09/10/2013 11:23, Peterson, Jon wrote:
> Moving the bar from MTI to mandatory-to-use (can we overload the acronym
> MTU?) goes beyond just questions of policy, and into the questions of how
> we build consensus and what the shapes the output of our engineering
> process.

How about mandatory-to-be-on-by-default and mandatory-to-have-an-off-switch?

    Brian

From stephen.farrell@cs.tcd.ie  Tue Oct  8 16:12:54 2013
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hi Jon,

I think SIP vs. WebRTC could be a fine contrast that could shed
some light on this, though its maybe a bit early in the latter
case. Do you know if anyone's done a comparison between those
two from the security point of view (well, between SIP deployment
and WebRTC plans is probably the best that could be done I guess).

Some more points below...

On 10/08/2013 11:23 PM, Peterson, Jon wrote:
> 
> Moving the bar from MTI to mandatory-to-use (can we overload the acronym
> MTU?) goes beyond just questions of policy, and into the questions of how
> we build consensus and what the shapes the output of our engineering
> process.

I don't think I agree there. My suggestion was that we discuss
whether or not we may have a new consensus, not a change in how
we determine consenesus. In the event it appeared there was a
new consensus on this list, that'd have to be tested more
broadly before it'd impact on anything.

> 
> Just to take an example I've followed a bit, SIP is relatively successful
> IETF protocol. It has some notable security issues. 

Nice understatement;-) IMO that's quite relevant too. SIP could be
at the same time a nice example of a successful insecure protocol
and of a very unsuccessful security protocol. That's a bit pejorative
but I guess you know what I mean.

> We could have designed
> SIP in a way that reduced the ability of middlemen to work themselves into
> the path of SIP messages, and thus reduced the potential for eavesdropping
> on the sessions that SIP creates - and its usefulness as a tool of
> surveillance.
> 
> Had we made some of those design decisions, however, it's unclear to me
> that SIP would have been such a successful protocol. 

Well, that assumes that the SIP-proxy driven aproach that's current was
always going to be necessary. Its clearly necessary now though so
the middlebox aspect is a real issue here (and for HTTP).

> But we wouldn't have
> made those decisions anyway, because the relevant documents would never
> have garnered consensus in the working groups. Our consensus process
> reflects the aggregate of the requirements of our participants, which come
> from many sources: employers, or regulators, or academic interests, or
> personal consciences.
> 
> If we had designed SIP to be a protocol that didn't meet those
> requirements, of course it wouldn't see much deployment. Extensions to SIP
> that have leaned in this direction have had little impact on the
> protocol's use. That is the purpose of a consensus process, to reflect the
> likely implementation and deployment community. Like it or not, the
> participants in our consensus process want protocols like SIP to be
> modifiable by intermediaries for numerous reasons - and once we open that
> door, we have to understand it will be open for all comers.
> 
> We could change our process so that it overrides consensus on some of
> these crucial points. I think it would be safe to say that we already do
> so, in a limited way, as a results of various forms of cross-area review.
> As popular protocol go through our process, we levy requirements that are
> winked at by document authors and ignored by implementers. 

Yeah, that's a PITA. References to RFC 4744 and RFC 3118 are my least
favourite things to see when reviewing drafts. Both indicate that
people are trying to pretend to do security, and that they're even
doing that badly;-)

That does I think make for an argument for more than MTI - if it
really has to be used for the protocol to operate, then its far
more likely to work and get used and have been properly engineered.

> There are
> however lines here we could cross that would result in nothing but the
> severing of IETF work from the reality of deployment. That would not serve
> our mission of making the Internet better.
> 
> We undoubtedly need to make changes to reflect our new understanding of
> the threats facing the Internet. I think this needs to come from the
> bottom up, though, not from the top down. 

Fully agree. And that's what (I think) we're doing here. Seeing what
really is new and what folks want to do about it. But maybe I'm mixed
up, I've no idea what top-down thing you mean to be honest.

> I am heartened that our
> consensus process has elevated core security mechanisms to
> mandatory-to-use level for some recent work, like in RTCWeb. We need to
> shed the brightest light we can on these issues, educate the community
> about the new risks and the practical countermeasures, and then execute
> our consensus process as we always have. In some cases, mandatory-to-use
> will be the right choice. In others, it won't.

That's one possible outcome - to say that more-than-MTI is a valid
choice that can be made on a protocol by protocol basis. And while
that's not described in BCP61, the WebRTC case shows its doable
aleady I guess that's an argument for the status quo. (Which is fine,
the point for now is to see what arguments there are that might
convince folks here that the status quo is or is not ok.)

S.


> 
> Jon Peterson
> Neustar, Inc.
> 
> On 10/8/13 2:14 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote:
> 
>>
>> Hi,
>>
>> Steve's mail argues for the current IETF position that
>> mandatory-to-implement (MTI) is the correct target IETF
>> specifications.
>>
>> Some folks (me included to be honest) wonder if the current
>> situation argues for raising the bar there somewhat on the
>> basis that MTI security features are frequently turned off
>> or not sufficiently well tested to be usable. (Pick your
>> favourite example, mine are usually rfc4744 or Diameter
>> being run in clear.) And an upshot from that is that that
>> helps those who want to pervasively monitor everything.
>>
>> Others argue that that'd be the IETF straying into the
>> space of policy - all we should do is define how to use
>> strong security features and make sure the code is there so
>> they can be turned on and the rest is policy.
>>
>> I'm sure there are loads more arguments, and I do think
>> it'd be useful to see those discussed here.
>>
>> Thanks,
>> Stephen.
>>
>> PS: Our -00 privacy BCP doesn't go beyond MTI for now, but
>> were there consensus for that, I think it'd be good if we
>> could go further.
>>
>>
>> _______________________________________________
>> perpass mailing list
>> perpass@ietf.org
>> https://www.ietf.org/mailman/listinfo/perpass
> 
> 
> 

From kathleen.moriarty@emc.com  Tue Oct  8 18:01:21 2013
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From: "Moriarty, Kathleen" <kathleen.moriarty@emc.com>
To: "Peterson, Jon" <jon.peterson@neustar.biz>, Stephen Farrell <stephen.farrell@cs.tcd.ie>, perpass <perpass@ietf.org>
Date: Tue, 8 Oct 2013 21:00:33 -0400
Thread-Topic: [perpass] mandatory-to-implement vs. more?
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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+1

I do run into cases where people are already confused on MTI and think it m=
eans MTU on IETF documents.  I've heard it used as a reason not to use a pr=
otocol (too complex for users to implement).  In one case, mutual authentic=
ation on a peer-to-peer exchange of sensitive information was argued as too=
 much and a non-IETF standard is getting some traction as a result (so is t=
he IETF standard by those who actually evaluated).  I do think it is import=
ant to have key features as MTI, then making it very clear what is MTU and =
what is by policy may be fine.

Many of us will have to worry about customer requirements that will cover a=
 broad range from different governments (these could evolve), those worried=
 about monitoring, and those that don't set forth any requirements.

Thanks,
Kathleen

-----Original Message-----
From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf =
Of Peterson, Jon
Sent: Tuesday, October 08, 2013 6:24 PM
To: Stephen Farrell; perpass
Subject: Re: [perpass] mandatory-to-implement vs. more?


Moving the bar from MTI to mandatory-to-use (can we overload the acronym
MTU?) goes beyond just questions of policy, and into the questions of how w=
e build consensus and what the shapes the output of our engineering process=
.

Just to take an example I've followed a bit, SIP is relatively successful I=
ETF protocol. It has some notable security issues. We could have designed S=
IP in a way that reduced the ability of middlemen to work themselves into t=
he path of SIP messages, and thus reduced the potential for eavesdropping o=
n the sessions that SIP creates - and its usefulness as a tool of surveilla=
nce.

Had we made some of those design decisions, however, it's unclear to me tha=
t SIP would have been such a successful protocol. But we wouldn't have made=
 those decisions anyway, because the relevant documents would never have ga=
rnered consensus in the working groups. Our consensus process reflects the =
aggregate of the requirements of our participants, which come from many sou=
rces: employers, or regulators, or academic interests, or personal conscien=
ces.

If we had designed SIP to be a protocol that didn't meet those requirements=
, of course it wouldn't see much deployment. Extensions to SIP that have le=
aned in this direction have had little impact on the protocol's use. That i=
s the purpose of a consensus process, to reflect the likely implementation =
and deployment community. Like it or not, the participants in our consensus=
 process want protocols like SIP to be modifiable by intermediaries for num=
erous reasons - and once we open that door, we have to understand it will b=
e open for all comers.

We could change our process so that it overrides consensus on some of these=
 crucial points. I think it would be safe to say that we already do so, in =
a limited way, as a results of various forms of cross-area review.
As popular protocol go through our process, we levy requirements that are w=
inked at by document authors and ignored by implementers. There are however=
 lines here we could cross that would result in nothing but the severing of=
 IETF work from the reality of deployment. That would not serve our mission=
 of making the Internet better.

We undoubtedly need to make changes to reflect our new understanding of the=
 threats facing the Internet. I think this needs to come from the bottom up=
, though, not from the top down. I am heartened that our consensus process =
has elevated core security mechanisms to mandatory-to-use level for some re=
cent work, like in RTCWeb. We need to shed the brightest light we can on th=
ese issues, educate the community about the new risks and the practical cou=
ntermeasures, and then execute our consensus process as we always have. In =
some cases, mandatory-to-use will be the right choice. In others, it won't.

Jon Peterson
Neustar, Inc.

On 10/8/13 2:14 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote:

>
>Hi,
>
>Steve's mail argues for the current IETF position that=20
>mandatory-to-implement (MTI) is the correct target IETF specifications.
>
>Some folks (me included to be honest) wonder if the current situation=20
>argues for raising the bar there somewhat on the basis that MTI=20
>security features are frequently turned off or not sufficiently well=20
>tested to be usable. (Pick your favourite example, mine are usually=20
>rfc4744 or Diameter being run in clear.) And an upshot from that is=20
>that that helps those who want to pervasively monitor everything.
>
>Others argue that that'd be the IETF straying into the space of policy=20
>- all we should do is define how to use strong security features and=20
>make sure the code is there so they can be turned on and the rest is=20
>policy.
>
>I'm sure there are loads more arguments, and I do think it'd be useful=20
>to see those discussed here.
>
>Thanks,
>Stephen.
>
>PS: Our -00 privacy BCP doesn't go beyond MTI for now, but were there=20
>consensus for that, I think it'd be good if we could go further.
>
>
>_______________________________________________
>perpass mailing list
>perpass@ietf.org
>https://www.ietf.org/mailman/listinfo/perpass

_______________________________________________
perpass mailing list
perpass@ietf.org
https://www.ietf.org/mailman/listinfo/perpass


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On 10/09/2013 02:00 AM, Moriarty, Kathleen wrote:
> +1
> 
> I do run into cases where people are already confused on MTI and
> think it means MTU on IETF documents.  

True, but a different discussion.

> I've heard it used as a reason
> not to use a protocol (too complex for users to implement). 

Users don't implement as I'd use those terms, so I'm not
sure I get what you mean.

> In one
> case, mutual authentication on a peer-to-peer exchange of sensitive
> information was argued as too much and a non-IETF standard is getting
> some traction as a result (so is the IETF standard by those who
> actually evaluated).  I do think it is important to have key features
> as MTI, then making it very clear what is MTU and what is by policy
> may be fine.

Right, that's the status quo. AFAIK it leads to pretty much
all Diameter exchanges being done in clear. Now that we have
a new threat model, is that still considered ok? I think that
is really worth questioning. As Jon said - WebRTC can do it,
the initial SPDY proposals did it, so there's no reason why
most protocols can't do similarly that I can see - what's
different other than intent? I think there are interesting
questions there to explore.

> Many of us will have to worry about customer requirements that will
> cover a broad range from different governments (these could evolve),
> those worried about monitoring, and those that don't set forth any
> requirements.

That's a little ambiguous: I'm not sure if you're saying you
have customers who are concerned that pervasive monitoring might
be happening, or customers who are governemtns that worry that
they can't monitor enough;-)

But either way, the new reality seems to be that we have a
demonstration that a set of governments want to pervasively
monitor everything. And I'm sure there're others also trying
that. And now there'll be a whole new set trying to join that
club. So even the governments that want to monitor everyone
else will I think soon realise that they're better off it they
themselves/their citizens are less easy to monitor.

I'm very simple: this is an attack on the network. If we
treat it that way, and do that well, we might all win.

S.


> 
> Thanks, Kathleen
> 
> -----Original Message----- From: perpass-bounces@ietf.org
> [mailto:perpass-bounces@ietf.org] On Behalf Of Peterson, Jon Sent:
> Tuesday, October 08, 2013 6:24 PM To: Stephen Farrell; perpass 
> Subject: Re: [perpass] mandatory-to-implement vs. more?
> 
> 
> Moving the bar from MTI to mandatory-to-use (can we overload the
> acronym MTU?) goes beyond just questions of policy, and into the
> questions of how we build consensus and what the shapes the output of
> our engineering process.
> 
> Just to take an example I've followed a bit, SIP is relatively
> successful IETF protocol. It has some notable security issues. We
> could have designed SIP in a way that reduced the ability of
> middlemen to work themselves into the path of SIP messages, and thus
> reduced the potential for eavesdropping on the sessions that SIP
> creates - and its usefulness as a tool of surveillance.
> 
> Had we made some of those design decisions, however, it's unclear to
> me that SIP would have been such a successful protocol. But we
> wouldn't have made those decisions anyway, because the relevant
> documents would never have garnered consensus in the working groups.
> Our consensus process reflects the aggregate of the requirements of
> our participants, which come from many sources: employers, or
> regulators, or academic interests, or personal consciences.
> 
> If we had designed SIP to be a protocol that didn't meet those
> requirements, of course it wouldn't see much deployment. Extensions
> to SIP that have leaned in this direction have had little impact on
> the protocol's use. That is the purpose of a consensus process, to
> reflect the likely implementation and deployment community. Like it
> or not, the participants in our consensus process want protocols like
> SIP to be modifiable by intermediaries for numerous reasons - and
> once we open that door, we have to understand it will be open for all
> comers.
> 
> We could change our process so that it overrides consensus on some of
> these crucial points. I think it would be safe to say that we already
> do so, in a limited way, as a results of various forms of cross-area
> review. As popular protocol go through our process, we levy
> requirements that are winked at by document authors and ignored by
> implementers. There are however lines here we could cross that would
> result in nothing but the severing of IETF work from the reality of
> deployment. That would not serve our mission of making the Internet
> better.
> 
> We undoubtedly need to make changes to reflect our new understanding
> of the threats facing the Internet. I think this needs to come from
> the bottom up, though, not from the top down. I am heartened that our
> consensus process has elevated core security mechanisms to
> mandatory-to-use level for some recent work, like in RTCWeb. We need
> to shed the brightest light we can on these issues, educate the
> community about the new risks and the practical countermeasures, and
> then execute our consensus process as we always have. In some cases,
> mandatory-to-use will be the right choice. In others, it won't.
> 
> Jon Peterson Neustar, Inc.
> 
> On 10/8/13 2:14 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie>
> wrote:
> 
>> 
>> Hi,
>> 
>> Steve's mail argues for the current IETF position that 
>> mandatory-to-implement (MTI) is the correct target IETF
>> specifications.
>> 
>> Some folks (me included to be honest) wonder if the current
>> situation argues for raising the bar there somewhat on the basis
>> that MTI security features are frequently turned off or not
>> sufficiently well tested to be usable. (Pick your favourite
>> example, mine are usually rfc4744 or Diameter being run in clear.)
>> And an upshot from that is that that helps those who want to
>> pervasively monitor everything.
>> 
>> Others argue that that'd be the IETF straying into the space of
>> policy - all we should do is define how to use strong security
>> features and make sure the code is there so they can be turned on
>> and the rest is policy.
>> 
>> I'm sure there are loads more arguments, and I do think it'd be
>> useful to see those discussed here.
>> 
>> Thanks, Stephen.
>> 
>> PS: Our -00 privacy BCP doesn't go beyond MTI for now, but were
>> there consensus for that, I think it'd be good if we could go
>> further.
>> 
>> 
>> _______________________________________________ perpass mailing
>> list perpass@ietf.org 
>> https://www.ietf.org/mailman/listinfo/perpass
> 
> _______________________________________________ perpass mailing list 
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
> 
> _______________________________________________ perpass mailing list 
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
> 
> 

From jon.peterson@neustar.biz  Tue Oct  8 22:50:40 2013
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From: "Peterson, Jon" <jon.peterson@neustar.biz>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, perpass <perpass@ietf.org>
Thread-Topic: [perpass] mandatory-to-implement vs. more?
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I'm sure we could put together some instructive parables on the contrast
between SIP and WebRTC, but that would largely be a discussion about the
different market dynamics of browsers and the web versus the more
telecom-centric influences that shaped SIP. Again, a question of which
requirements constituents bring to the table and what points of consensus
we can reach.

And...

>>=20
>> Moving the bar from MTI to mandatory-to-use (can we overload the acronym
>> MTU?) goes beyond just questions of policy, and into the questions of
>>how
>> we build consensus and what the shapes the output of our engineering
>> process.
>
>I don't think I agree there. My suggestion was that we discuss
>whether or not we may have a new consensus, not a change in how
>we determine consenesus. In the event it appeared there was a
>new consensus on this list, that'd have to be tested more
>broadly before it'd impact on anything.

I think we could get a consensus that people really should eat broccoli,
but that's a very different matter than whether or not the meal in front
of us at any given moment should have broccoli in it.

We have a consensus that there should be cross-area review for security
today, and we are working towards similar constraints for privacy, but we
need to acknowledge that there is a certain amount of broccoli being
shoved onto random plates that is perhaps not going into people's mouths
today. If we replace the whole meal with broccoli, people will decide to
dine elsewhere.

[snip]
>>=20
>> We could change our process so that it overrides consensus on some of
>> these crucial points. I think it would be safe to say that we already do
>> so, in a limited way, as a results of various forms of cross-area
>>review.
>> As popular protocol go through our process, we levy requirements that
>>are
>> winked at by document authors and ignored by implementers.
>
>Yeah, that's a PITA. References to RFC 4744 and RFC 3118 are my least
>favourite things to see when reviewing drafts. Both indicate that
>people are trying to pretend to do security, and that they're even
>doing that badly;-)
>
>That does I think make for an argument for more than MTI - if it
>really has to be used for the protocol to operate, then its far
>more likely to work and get used and have been properly engineered.

I think it makes an argument that we need to target our security
requirements on places where they will genuinely impact implementations
and deployments, rather than flooding security anywhere it will fit and
hoping that a rising tide will lift all boats. Our current process is not
however conducive to identifying places where security will be successful.

[snip]
>> In some cases, mandatory-to-use
>> will be the right choice. In others, it won't.
>
>That's one possible outcome - to say that more-than-MTI is a valid
>choice that can be made on a protocol by protocol basis. And while
>that's not described in BCP61, the WebRTC case shows its doable
>aleady I guess that's an argument for the status quo. (Which is fine,
>the point for now is to see what arguments there are that might
>convince folks here that the status quo is or is not ok.)

I don't mean to argue for the status quo, I'm as outraged and scared as
anyone. I just don't want to see us make changes that will ultimately work
against our interests. I'd like to find ways that we can convince the
community to accept confidentiality mechanisms as routine. My concern is
that, as the case of SIP demonstrated, sometimes the success of a protocol
depends on lacking security features in certain places, and if we're here
to engineer successful protocols, broadly mandating the use of features
like confidentiality will necessary limit that success.

There will be places the community will accept security, and others where
they won't. Today, where they find guidance onerous they just ignore it -
if we make distasteful guidance inseparable from our protocols, then they
will just ignore our protocols.

Jon Peterson
Neustar, Inc.


>S.


From trammell@tik.ee.ethz.ch  Tue Oct  8 23:14:27 2013
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hi Brian, all,

On Oct 9, 2013, at 1:02 AM, Brian E Carpenter =
<brian.e.carpenter@gmail.com> wrote:

> On 09/10/2013 11:23, Peterson, Jon wrote:
>> Moving the bar from MTI to mandatory-to-use (can we overload the =
acronym
>> MTU?) goes beyond just questions of policy, and into the questions of =
how
>> we build consensus and what the shapes the output of our engineering
>> process.
>=20
> How about mandatory-to-be-on-by-default and =
mandatory-to-have-an-off-switch?

It doesn't seem to me that going any further is practical; declaring =
something "mandatory to use" especially in absence of a deployment =
certification program (and I hope we can agree we don't want to go =
there) essentially invites people to ignore you,

Mandatory default (beyond MTI) would at the very least have the effect =
of moving testing "with security" up the priority list during interop =
testing.

Case in point: IPFIX. SCTP + DTLS is MTI; TCP and UDP transports (each =
with TLS/DTLS) are optional. The situation is much better now, but at =
the time when the Proposed Standard revision (RFC 5101) was first =
undergoing interop testing, doing a compliant open-source implementation =
pretty much meant trying to hack working DTLS over SCTP into OpenSSL or =
similar, or worse, rolling your own DTLS from scratch. So the interop =
testing ran through all the features "insecure", then treated security =
as an afterthought. At the first one I took part in, we only managed to =
interop TCP+TLS.

The temporary guidance we gave in this situation (RFC 5153): use SCTP on =
dedicated or otherwise-secured (e.g. IPsec tunnels) for new =
installations inside a trusted perimeter, use TCP+TLS for IPFIX on the =
open Internet until SCTP+DTLS works. Since NetFlow ran over UDP (very =
convenient especially for mostly-hardware implementations of exporters) =
and the NetFlow community is used to the myriad ways in which NetFlow =
over UDP can fail, we defined a UDP (and UDP+DTLS) binding for IPFIX as =
well.

Now, SCTP has its own problems on the open Internet, and we'll probably =
end up defining IPFIX over SCTP over UDP+DTLS as an alternate binding to =
get around the dodgy middleboxes; that's a separate issue. But I do =
think part of the problem is that we did not specify default-on for =
security. The result? Most IPFIX I know of runs unsecured on UDP on =
local network links which are presumed secure since they're inside the =
perimeter and don't touch the Big Scary Internet, because that's what =
you get when you take the box out of the box and plug it in.

Making mandatory default security work is difficult in current practice, =
in that it adds key management to the out-of-box experience, and there =
is very little if anything that is fun about key management. Moving =
toward opportunistic encryption here would be a significant improvement: =
it guarantees less than "doing it right", but much more than nothing, =
and in a lot of cases nothing is what we have.

Cheers,

Brian


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On 8 October 2013 22:14, Stephen Farrell <stephen.farrell@cs.tcd.ie> wrote:
>
>
> Hi,
>
> Steve's mail argues for the current IETF position that
> mandatory-to-implement (MTI) is the correct target IETF
> specifications.
>
> Some folks (me included to be honest) wonder if the current
> situation argues for raising the bar there somewhat on the
> basis that MTI security features are frequently turned off
> or not sufficiently well tested to be usable. (Pick your
> favourite example, mine are usually rfc4744 or Diameter
> being run in clear.) And an upshot from that is that that
> helps those who want to pervasively monitor everything.
>
>
> Others argue that that'd be the IETF straying into the
> space of policy - all we should do is define how to use
> strong security features and make sure the code is there so
> they can be turned on and the rest is policy.
>
> I'm sure there are loads more arguments, and I do think
> it'd be useful to see those discussed here.

How about a distinction in compliance? That is, you can say you comply
to RFC xyzw if you implement it, but to say you _securely_ comply, you
have to switch on the MTUFS (mandatory to use for security) and switch
off MTNUFS (mandatory to not use for security) features in the RFC.
Some RFCs could only have a secure compliance mode, of course.

That way, those who argue that the security is too expensive/not
needed for their use case can disable it, but then can't claim that
they're secure (regardless of the name of the RFC :-).

So, in TLS, for example, secure compliance might consist of TLS 1.2 +
AEAD modes only (note: really an example, not an actual proposal).

From kathleen.moriarty@emc.com  Wed Oct  9 06:28:58 2013
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From: "Moriarty, Kathleen" <kathleen.moriarty@emc.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, "Peterson, Jon" <jon.peterson@neustar.biz>, perpass <perpass@ietf.org>
Date: Wed, 9 Oct 2013 09:28:38 -0400
Thread-Topic: [perpass] mandatory-to-implement vs. more?
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hi Stephen,

I'll respond in line to clarify my initial email.

Thanks,
Kathleen
-----Original Message-----
From: Stephen Farrell [mailto:stephen.farrell@cs.tcd.ie]=20
Sent: Tuesday, October 08, 2013 9:34 PM
To: Moriarty, Kathleen; Peterson, Jon; perpass
Subject: Re: [perpass] mandatory-to-implement vs. more?



On 10/09/2013 02:00 AM, Moriarty, Kathleen wrote:
> +1
>=20
> I do run into cases where people are already confused on MTI and think=20
> it means MTU on IETF documents.

True, but a different discussion.

KM> Yes, but if these are more clearly defined, it could help with the prob=
lem you are trying to solve.  Non-IETF people (developers and those who use=
/setup protocols), from my experience, have trouble understanding what MTI =
means and the scope of it.  Having MTU defined and differentiated clearly c=
ould help this group and assist with the problem you are trying to solve.

> I've heard it used as a reason
> not to use a protocol (too complex for users to implement).=20

Users don't implement as I'd use those terms, so I'm not sure I get what yo=
u mean.

KM> By implement, I mean setup as opposed to develop code, which is where y=
ou mean implement.  Using a protocol may not be the same person as the one =
who set up a connection. =20

> In one
> case, mutual authentication on a peer-to-peer exchange of sensitive=20
> information was argued as too much and a non-IETF standard is getting=20
> some traction as a result (so is the IETF standard by those who=20
> actually evaluated).  I do think it is important to have key features=20
> as MTI, then making it very clear what is MTU and what is by policy=20
> may be fine.

Right, that's the status quo. AFAIK it leads to pretty much all Diameter ex=
changes being done in clear. Now that we have a new threat model, is that s=
till considered ok? I think that is really worth questioning. As Jon said -=
 WebRTC can do it, the initial SPDY proposals did it, so there's no reason =
why most protocols can't do similarly that I can see - what's different oth=
er than intent? I think there are interesting questions there to explore.

KM> In the case of MILE, there was a protocol written outside of the IETF c=
alled TAXII, that is very similar to RID.  Some of the initial reasons that=
 the developers of TAXII used to promote it over RID was that their protoco=
l didn't require mutual authentication, it also does not require TLS and ca=
n be sent in the clear if security is too much trouble to configure.  This =
explanation came my way by a few people.  RID also specifies the ability to=
 provide object level security (XML encryption and digital signatures), thi=
s was also seen as too much by the TAXII team even though RID has it as MTI=
, not MTU.  They are promoting the use of many options, which in addition t=
o security problems, will make interoperability difficult.  There is a lot =
more to this discussion, but I am limiting it to security features and the =
result - a protocol that did not have the benefit of IETF review and securi=
ty options is in use for some instead.  Some are using RID, but how this wi=
ll play out is still TBD as some prefer the security features and I think i=
t is necessary to have them in a protocol that transports sensitive data.  =
There are other protocols that may be better for some use cases, but that's=
 another discussion as well.

> Many of us will have to worry about customer requirements that will=20
> cover a broad range from different governments (these could evolve),=20
> those worried about monitoring, and those that don't set forth any=20
> requirements.

That's a little ambiguous: I'm not sure if you're saying you have customers=
 who are concerned that pervasive monitoring might be happening, or custome=
rs who are governemtns that worry that they can't monitor enough;-)

KM> Both - some governments do not want to sue protocols they suspect could=
 be subject to monitoring.  Then we still have to worry about FIPS complian=
ce requirements for the US government.  For the last group who are in the d=
ark, it would be nice to have them using secure protocols without them havi=
ng to know about it.

But either way, the new reality seems to be that we have a demonstration th=
at a set of governments want to pervasively monitor everything. And I'm sur=
e there're others also trying that. And now there'll be a whole new set try=
ing to join that club. So even the governments that want to monitor everyon=
e else will I think soon realise that they're better off it they themselves=
/their citizens are less easy to monitor.

I'm very simple: this is an attack on the network. If we treat it that way,=
 and do that well, we might all win.

KM> The current reality for vendors is that we have to have options.  There=
 might be a monitoring prevention set of options or a profile and a profile=
 to meet specific requirements for regulations (industry or government).  I=
n an ideal world, we could just prevent monitoring everywhere (to the best =
of our knowledge)

S.


>=20
> Thanks, Kathleen
>=20
> -----Original Message----- From: perpass-bounces@ietf.org=20
> [mailto:perpass-bounces@ietf.org] On Behalf Of Peterson, Jon Sent:
> Tuesday, October 08, 2013 6:24 PM To: Stephen Farrell; perpass
> Subject: Re: [perpass] mandatory-to-implement vs. more?
>=20
>=20
> Moving the bar from MTI to mandatory-to-use (can we overload the=20
> acronym MTU?) goes beyond just questions of policy, and into the=20
> questions of how we build consensus and what the shapes the output of=20
> our engineering process.
>=20
> Just to take an example I've followed a bit, SIP is relatively=20
> successful IETF protocol. It has some notable security issues. We=20
> could have designed SIP in a way that reduced the ability of middlemen=20
> to work themselves into the path of SIP messages, and thus reduced the=20
> potential for eavesdropping on the sessions that SIP creates - and its=20
> usefulness as a tool of surveillance.
>=20
> Had we made some of those design decisions, however, it's unclear to=20
> me that SIP would have been such a successful protocol. But we=20
> wouldn't have made those decisions anyway, because the relevant=20
> documents would never have garnered consensus in the working groups.
> Our consensus process reflects the aggregate of the requirements of=20
> our participants, which come from many sources: employers, or=20
> regulators, or academic interests, or personal consciences.
>=20
> If we had designed SIP to be a protocol that didn't meet those=20
> requirements, of course it wouldn't see much deployment. Extensions to=20
> SIP that have leaned in this direction have had little impact on the=20
> protocol's use. That is the purpose of a consensus process, to reflect=20
> the likely implementation and deployment community. Like it or not,=20
> the participants in our consensus process want protocols like SIP to=20
> be modifiable by intermediaries for numerous reasons - and once we=20
> open that door, we have to understand it will be open for all comers.
>=20
> We could change our process so that it overrides consensus on some of=20
> these crucial points. I think it would be safe to say that we already=20
> do so, in a limited way, as a results of various forms of cross-area=20
> review. As popular protocol go through our process, we levy=20
> requirements that are winked at by document authors and ignored by=20
> implementers. There are however lines here we could cross that would=20
> result in nothing but the severing of IETF work from the reality of=20
> deployment. That would not serve our mission of making the Internet=20
> better.
>=20
> We undoubtedly need to make changes to reflect our new understanding=20
> of the threats facing the Internet. I think this needs to come from=20
> the bottom up, though, not from the top down. I am heartened that our=20
> consensus process has elevated core security mechanisms to=20
> mandatory-to-use level for some recent work, like in RTCWeb. We need=20
> to shed the brightest light we can on these issues, educate the=20
> community about the new risks and the practical countermeasures, and=20
> then execute our consensus process as we always have. In some cases,=20
> mandatory-to-use will be the right choice. In others, it won't.
>=20
> Jon Peterson Neustar, Inc.
>=20
> On 10/8/13 2:14 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie>
> wrote:
>=20
>>=20
>> Hi,
>>=20
>> Steve's mail argues for the current IETF position that=20
>> mandatory-to-implement (MTI) is the correct target IETF=20
>> specifications.
>>=20
>> Some folks (me included to be honest) wonder if the current situation=20
>> argues for raising the bar there somewhat on the basis that MTI=20
>> security features are frequently turned off or not sufficiently well=20
>> tested to be usable. (Pick your favourite example, mine are usually=20
>> rfc4744 or Diameter being run in clear.) And an upshot from that is=20
>> that that helps those who want to pervasively monitor everything.
>>=20
>> Others argue that that'd be the IETF straying into the space of=20
>> policy - all we should do is define how to use strong security=20
>> features and make sure the code is there so they can be turned on and=20
>> the rest is policy.
>>=20
>> I'm sure there are loads more arguments, and I do think it'd be=20
>> useful to see those discussed here.
>>=20
>> Thanks, Stephen.
>>=20
>> PS: Our -00 privacy BCP doesn't go beyond MTI for now, but were there=20
>> consensus for that, I think it'd be good if we could go further.
>>=20
>>=20
>> _______________________________________________ perpass mailing list=20
>> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
>=20
> _______________________________________________ perpass mailing list=20
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
>=20
> _______________________________________________ perpass mailing list=20
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
>=20
>=20


From kent@bbn.com  Wed Oct  9 08:56:21 2013
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Cc: perpass <perpass@ietf.org>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Ben,

> O...
> How about a distinction in compliance? That is, you can say you comply
> to RFC xyzw if you implement it, but to say you _securely_ comply, you
> have to switch on the MTUFS (mandatory to use for security) and switch
> off MTNUFS (mandatory to not use for security) features in the RFC.
> Some RFCs could only have a secure compliance mode, of course.
>
> That way, those who argue that the security is too expensive/not
> needed for their use case can disable it, but then can't claim that
> they're secure (regardless of the name of the RFC :-).
>
> So, in TLS, for example, secure compliance might consist of TLS 1.2 +
> AEAD modes only (note: really an example, not an actual proposal).
That's a novel suggestion, a clever way to try to thread the needle!
But, for many, many years we've had trouble getting the broader community to
recognize than not all RFCs are standards. I doubt that the distinction
you suggest would be better understood.

Steve

From benl@google.com  Wed Oct  9 09:47:24 2013
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From: Ben Laurie <benl@google.com>
To: Stephen Kent <kent@bbn.com>
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Cc: perpass <perpass@ietf.org>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On 9 October 2013 16:55, Stephen Kent <kent@bbn.com> wrote:
> Ben,
>
>> O...
>>
>> How about a distinction in compliance? That is, you can say you comply
>> to RFC xyzw if you implement it, but to say you _securely_ comply, you
>> have to switch on the MTUFS (mandatory to use for security) and switch
>> off MTNUFS (mandatory to not use for security) features in the RFC.
>> Some RFCs could only have a secure compliance mode, of course.
>>
>> That way, those who argue that the security is too expensive/not
>> needed for their use case can disable it, but then can't claim that
>> they're secure (regardless of the name of the RFC :-).
>>
>> So, in TLS, for example, secure compliance might consist of TLS 1.2 +
>> AEAD modes only (note: really an example, not an actual proposal).
>
> That's a novel suggestion, a clever way to try to thread the needle!
> But, for many, many years we've had trouble getting the broader community to
> recognize than not all RFCs are standards. I doubt that the distinction
> you suggest would be better understood.

It's all about incentives. Why would anyone care right now whether an
RFC is a standard or not? No-one beats them up for complying with
non-standards. Or even failing to comply with standards.

If we are proposing to move into a world where we incentivise people
to care, then we need to actually call out people who fail to follow
the standards - and, as well, who fail to follow the secure standards.

Just as now it is at least reasonably well understood by vendors that
TLS is desirable, because it gets pointed out if it isn't used, we
need to do the same for other secure standards.

Note that TLS for SMTP does not enjoy the same level of security as
TLS for HTTP. Why? I claim it is because it is completely invisible to
users, so there's no incentives for vendors to get it right.

We need to make these things visible (and I don't mean "show a
padlock", btw, I mean the kind of visibility we propose for
Certificate Transparency, namely, if it doesn't work right, you don't
connect).

From kent@bbn.com  Wed Oct  9 10:22:37 2013
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Stephen,

Thanks for creating a new thread to discuss this topic. It's a good 
starting point for

an important discussion.


I think MTU (vs. MTI) is a very hard argument to make, for several reasons,
some of which I noted in my response to Dean.

Internet protocols are used in a very, very wide range of contexts, 
e.g., enterprises of various sorts, the IoT, and public environments. In 
principle one ought to make decisions about what security measures to 
deploy and enable based on a perception of threat. Threats differ in 
different contexts. Our current, MTI-based approach to security enables 
responsible parties in each environment to make decisions about what 
security to offer based on perceived threats and tradeoffs, e.g., 
performance, processing overhead, user experience, etc.

I admit that, in my experience, very few parties appear to make such 
decisions in a well thought-out fashion, but they could. Suggesting that 
we can make such decisions for the folks who are ultimately responsible 
for the operation of services in a wide range of contexts strikes me 
hubristic.

We've already made concessions for the Smart Grid context in the case of 
IPsec as MTI for IPv6. To me this suggests that we were persuaded that 
even MTI can be a barrier to adoption and deployment in some contexts. 
Pursuing a single set of MTUstandards for a wide range of contexts seems 
doomed to failure. Generating MTU RFCs for various contexts might be an 
alternative. That would imply MTI protocol standards, augmented with 
BCPs. Is that what you envision?


Evaluating tradeoffs of security and privacy vs. other factors is hard 
when one deals with a wide range of contexts. For example, end user 
devices range from big servers to laptops, to tablets, to smart phones. 
Battery use if a big issue for some of these devices, as is bandwidth. 
Some of the more extreme TFS mechanisms discussed would have adverse 
implications for both. That's an example of why MTU, at the protocol 
spec levelk,
strikes me as a bad idea.

There are a lot of middleboxes in the Internet. I am no fan of them; I'm 
a true believer in the e-t-e model for everything, not just security. 
But middleboxes are a fact of life and they exist because the folks who 
purchase equipment and offer services have found them to be operational 
necessities. Middleboxes provide ways to deal with backward 
compatibility and migration issues, broken implementations from vendors, 
security services for enterprises, network traffic engineering, etc. If 
we argue that security against widespread nation-state surveillance is 
more important than all of these other considerations, I think we risk 
having the IETF be described as out of touch with reality.

Steve



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        style="font-family:Courier;mso-fareast-font-family:
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        Roman&quot;">Stephen,<br>
        <br>
        Thanks for creating a new thread to discuss this topic. It's a
        good starting point for <br>
      </span></p>
    <p class="MsoNormal"><span
        style="font-family:Courier;mso-fareast-font-family:
        &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New
        Roman&quot;">an important discussion.</span></p>
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        style="font-family:Courier;mso-fareast-font-family:
        &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New
        Roman&quot;"><br>
        I think MTU (vs. MTI) is a very hard argument to make, for
        several reasons, <br>
        some
        of which I noted in my response to Dean.<br
          style="mso-special-character:line-break">
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        style="font-family:Courier;mso-fareast-font-family:
        &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New
        Roman&quot;">Internet protocols
        are used in a very, very wide range of contexts, e.g.,
        enterprises of various sorts,
        the IoT, and public environments. In principle one ought to make
        decisions
        about what security measures to deploy and enable based on a
        perception of
        threat. Threats differ in different contexts. Our current,
        MTI-based approach
        to security enables responsible parties in each environment to
        make decisions
        about what security to offer based on perceived threats and
        tradeoffs, e.g., performance,
        processing overhead, user experience, etc. <o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-family:Courier;mso-fareast-font-family:
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        style="font-family:Courier;mso-fareast-font-family:
        &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New
        Roman&quot;">I admit that, in my
        experience, very few parties appear to make such decisions in a
        well
        thought-out fashion, but they could. Suggesting that we can make
        such decisions
        for the folks who are ultimately responsible for the operation
        of services in a
        wide range of contexts strikes me hubristic.<o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-family:Courier;mso-fareast-font-family:
        &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New
        Roman&quot;"><o:p>&nbsp;</o:p></span></p>
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        style="font-family:Courier;mso-fareast-font-family:
        &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New
        Roman&quot;">We&#8217;ve already made
        concessions for the Smart Grid context in the case of IPsec as
        MTI for IPv6. To
        me this suggests that we were persuaded that even MTI can be a
        barrier to
        adoption and deployment in some contexts. Pursuing a single set
        of MTU<span style="mso-spacerun:yes">&nbsp; </span>standards for a
        wide range of contexts seems doomed to failure. Generating MTU
        RFCs for various contexts might be an alternative. That would
        imply MTI protocol standards, augmented with
        BCPs. Is that what you envision?<o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-family:Courier;mso-fareast-font-family:
        &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New
        Roman&quot;"><br>
        Evaluating tradeoffs of security and privacy vs. other factors
        is hard when one
        deals with a wide range of contexts. For example, end user
        devices range from
        big servers to laptops, to tablets, to smart phones. Battery use
        if a big issue
        for some of these devices, as is bandwidth. Some of the more
        extreme TFS
        mechanisms discussed would have adverse implications for both.
        That's an example of why MTU, at the protocol spec levelk,<br>
        strikes me as a bad idea.<o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-family:Courier;mso-fareast-font-family:
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        Roman&quot;"><o:p>&nbsp;</o:p></span></p>
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        style="font-family:Courier;mso-fareast-font-family:
        &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New
        Roman&quot;">There are a lot of
        middleboxes in the Internet. I am no fan of them; I&#8217;m a true
        believer in the e-t-e
        model for everything, not just security. But middleboxes are a
        fact of life and
        they exist because the folks who purchase equipment and offer
        services have
        found them to be operational necessities. Middleboxes provide
        ways to deal with
        backward compatibility and migration issues, broken
        implementations from vendors,
        security services for enterprises, network traffic engineering,
        etc. If we
        argue that security against widespread nation-state surveillance
        is more
        important than all of these other considerations, I think we
        risk having the
        IETF be described as out of touch with reality.<br>
        <br>
      </span></p>
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        style="font-family:Courier;mso-fareast-font-family:
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From kent@bbn.com  Wed Oct  9 10:33:36 2013
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Date: Wed, 09 Oct 2013 13:33:29 -0400
From: Stephen Kent <kent@bbn.com>
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Ben,
...
> It's all about incentives. Why would anyone care right now whether an
> RFC is a standard or not? No-one beats them up for complying with
> non-standards. Or even failing to comply with standards.
That does not seem to be uniformly true. Some folks who purchase
equipment have been know to require prospective bidders to
assert that the products being proposed comply with selected RFCs.
> If we are proposing to move into a world where we incentivise people
> to care, then we need to actually call out people who fail to follow
> the standards - and, as well, who fail to follow the secure standards.
I think we gave up on  the notion of the IETF packet police a long time
ago, when Jeff Schiller was Sec AD. :-)
> Just as now it is at least reasonably well understood by vendors that
> TLS is desirable, because it gets pointed out if it isn't used, we
> need to do the same for other secure standards.
TLS has been very successful in terms of widespread deployment, and
a lot of web sites mandate its use. But, it is also an example of
a good technology that has often been misunderstood. If I am at home,
making a credit-card purchase, TLS provides me with protection against
the wrong threat. My CC number is at much greater risk of being stolen
once it has arrived (securely) at the server, vs. when it was in transit.
(If I were using WiFi in Starbucks the threat mode would be different.)
The real benefit to me, as a client, is the nominal authentication of 
the web
site offered by use of the underlying PKI. Of course, the browser PKI model
is not so great, but it's better than nothing.
> Note that TLS for SMTP does not enjoy the same level of security as
> TLS for HTTP. Why? I claim it is because it is completely invisible to
> users, so there's no incentives for vendors to get it right.
My example above suggests another possible reason; I don't perceive
a serious threat against inter-SMTP server hops for the vast majority of 
my e-mail.
> We need to make these things visible (and I don't mean "show a
> padlock", btw, I mean the kind of visibility we propose for
> Certificate Transparency, namely, if it doesn't work right, you don't
> connect).
Ben, please stop pushing CT as the solution for everything; it's become
more than tiresome.

Steve

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Date: Wed, 9 Oct 2013 18:51:51 +0100
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From: Ben Laurie <benl@google.com>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On 9 October 2013 18:33, Stephen Kent <kent@bbn.com> wrote:
>> We need to make these things visible (and I don't mean "show a
>> padlock", btw, I mean the kind of visibility we propose for
>> Certificate Transparency, namely, if it doesn't work right, you don't
>> connect).
>
> Ben, please stop pushing CT as the solution for everything; it's become
> more than tiresome.

I was not pushing CT in any way! I was pushing for visibility that is
not a padlock, since we know that doesn't work.

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Ben,

Sorry if I misinterpreted your comment in this context.

Steve
> ...
>> Ben, please stop pushing CT as the solution for everything; it's become
>> more than tiresome.
> I was not pushing CT in any way! I was pushing for visibility that is
> not a padlock, since we know that doesn't work.
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>


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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On 9 October 2013 18:33, Stephen Kent <kent@bbn.com> wrote:
> Ben,
> ...
>
>> It's all about incentives. Why would anyone care right now whether an
>> RFC is a standard or not? No-one beats them up for complying with
>> non-standards. Or even failing to comply with standards.
>
> That does not seem to be uniformly true. Some folks who purchase
> equipment have been know to require prospective bidders to
> assert that the products being proposed comply with selected RFCs.
>
>> If we are proposing to move into a world where we incentivise people
>> to care, then we need to actually call out people who fail to follow
>> the standards - and, as well, who fail to follow the secure standards.
>
> I think we gave up on  the notion of the IETF packet police a long time
> ago, when Jeff Schiller was Sec AD. :-)

Yeah, I don't think that's the answer. I think the answer is more
along the lines of products not taking the attitude that they should
work around everyone's broken crap, but instead that they should take
a hard line.

In short, "be liberal in what you accept" was a terrible idea for
security and its time we dropped it.

>> Just as now it is at least reasonably well understood by vendors that
>> TLS is desirable, because it gets pointed out if it isn't used, we
>> need to do the same for other secure standards.
>
> TLS has been very successful in terms of widespread deployment, and
> a lot of web sites mandate its use. But, it is also an example of
> a good technology that has often been misunderstood. If I am at home,
> making a credit-card purchase, TLS provides me with protection against
> the wrong threat. My CC number is at much greater risk of being stolen
> once it has arrived (securely) at the server, vs. when it was in transit.
> (If I were using WiFi in Starbucks the threat mode would be different.)
> The real benefit to me, as a client, is the nominal authentication of the
> web
> site offered by use of the underlying PKI. Of course, the browser PKI model
> is not so great, but it's better than nothing.
>
>> Note that TLS for SMTP does not enjoy the same level of security as
>> TLS for HTTP. Why? I claim it is because it is completely invisible to
>> users, so there's no incentives for vendors to get it right.
>
> My example above suggests another possible reason; I don't perceive
> a serious threat against inter-SMTP server hops for the vast majority of my
> e-mail.

But this is exactly the problem: 99% of the time you don't care, so
you argue that we should make it impossible to fix your problem in the
other 1% of cases.

I think the new reality is that you should worry about the 1% of the
time you care and put up with whatever slight hardships it brings for
your 99% case.

From richard@shockey.us  Wed Oct  9 13:57:37 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Well from a SIP perspective we have always had mandatory to implement TLS in
any number of specifications but in practice no one uses it. No one.  No one
cares.  

-----Original Message-----
From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf
Of Stephen Farrell
Sent: Tuesday, October 08, 2013 7:13 PM
To: Peterson, Jon; perpass
Subject: Re: [perpass] mandatory-to-implement vs. more?


Hi Jon,

I think SIP vs. WebRTC could be a fine contrast that could shed some light
on this, though its maybe a bit early in the latter case. Do you know if
anyone's done a comparison between those two from the security point of view
(well, between SIP deployment and WebRTC plans is probably the best that
could be done I guess).

Some more points below...

On 10/08/2013 11:23 PM, Peterson, Jon wrote:
> 
> Moving the bar from MTI to mandatory-to-use (can we overload the 
> acronym
> MTU?) goes beyond just questions of policy, and into the questions of 
> how we build consensus and what the shapes the output of our 
> engineering process.

I don't think I agree there. My suggestion was that we discuss whether or
not we may have a new consensus, not a change in how we determine
consenesus. In the event it appeared there was a new consensus on this list,
that'd have to be tested more broadly before it'd impact on anything.

> 
> Just to take an example I've followed a bit, SIP is relatively 
> successful IETF protocol. It has some notable security issues.

Nice understatement;-) IMO that's quite relevant too. SIP could be at the
same time a nice example of a successful insecure protocol and of a very
unsuccessful security protocol. That's a bit pejorative but I guess you know
what I mean.

> We could have designed
> SIP in a way that reduced the ability of middlemen to work themselves 
> into the path of SIP messages, and thus reduced the potential for 
> eavesdropping on the sessions that SIP creates - and its usefulness as 
> a tool of surveillance.
> 
> Had we made some of those design decisions, however, it's unclear to 
> me that SIP would have been such a successful protocol.

Well, that assumes that the SIP-proxy driven aproach that's current was
always going to be necessary. Its clearly necessary now though so the
middlebox aspect is a real issue here (and for HTTP).

> But we wouldn't have
> made those decisions anyway, because the relevant documents would 
> never have garnered consensus in the working groups. Our consensus 
> process reflects the aggregate of the requirements of our 
> participants, which come from many sources: employers, or regulators, 
> or academic interests, or personal consciences.
> 
> If we had designed SIP to be a protocol that didn't meet those 
> requirements, of course it wouldn't see much deployment. Extensions to 
> SIP that have leaned in this direction have had little impact on the 
> protocol's use. That is the purpose of a consensus process, to reflect 
> the likely implementation and deployment community. Like it or not, 
> the participants in our consensus process want protocols like SIP to 
> be modifiable by intermediaries for numerous reasons - and once we 
> open that door, we have to understand it will be open for all comers.
> 
> We could change our process so that it overrides consensus on some of 
> these crucial points. I think it would be safe to say that we already 
> do so, in a limited way, as a results of various forms of cross-area
review.
> As popular protocol go through our process, we levy requirements that 
> are winked at by document authors and ignored by implementers.

Yeah, that's a PITA. References to RFC 4744 and RFC 3118 are my least
favourite things to see when reviewing drafts. Both indicate that people are
trying to pretend to do security, and that they're even doing that badly;-)

That does I think make for an argument for more than MTI - if it really has
to be used for the protocol to operate, then its far more likely to work and
get used and have been properly engineered.

> There are
> however lines here we could cross that would result in nothing but the 
> severing of IETF work from the reality of deployment. That would not 
> serve our mission of making the Internet better.
> 
> We undoubtedly need to make changes to reflect our new understanding 
> of the threats facing the Internet. I think this needs to come from 
> the bottom up, though, not from the top down.

Fully agree. And that's what (I think) we're doing here. Seeing what really
is new and what folks want to do about it. But maybe I'm mixed up, I've no
idea what top-down thing you mean to be honest.

> I am heartened that our
> consensus process has elevated core security mechanisms to 
> mandatory-to-use level for some recent work, like in RTCWeb. We need 
> to shed the brightest light we can on these issues, educate the 
> community about the new risks and the practical countermeasures, and 
> then execute our consensus process as we always have. In some cases, 
> mandatory-to-use will be the right choice. In others, it won't.

That's one possible outcome - to say that more-than-MTI is a valid choice
that can be made on a protocol by protocol basis. And while that's not
described in BCP61, the WebRTC case shows its doable aleady I guess that's
an argument for the status quo. (Which is fine, the point for now is to see
what arguments there are that might convince folks here that the status quo
is or is not ok.)

S.


> 
> Jon Peterson
> Neustar, Inc.
> 
> On 10/8/13 2:14 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote:
> 
>>
>> Hi,
>>
>> Steve's mail argues for the current IETF position that 
>> mandatory-to-implement (MTI) is the correct target IETF 
>> specifications.
>>
>> Some folks (me included to be honest) wonder if the current situation 
>> argues for raising the bar there somewhat on the basis that MTI 
>> security features are frequently turned off or not sufficiently well 
>> tested to be usable. (Pick your favourite example, mine are usually 
>> rfc4744 or Diameter being run in clear.) And an upshot from that is 
>> that that helps those who want to pervasively monitor everything.
>>
>> Others argue that that'd be the IETF straying into the space of 
>> policy - all we should do is define how to use strong security 
>> features and make sure the code is there so they can be turned on and 
>> the rest is policy.
>>
>> I'm sure there are loads more arguments, and I do think it'd be 
>> useful to see those discussed here.
>>
>> Thanks,
>> Stephen.
>>
>> PS: Our -00 privacy BCP doesn't go beyond MTI for now, but were there 
>> consensus for that, I think it'd be good if we could go further.
>>
>>
>> _______________________________________________
>> perpass mailing list
>> perpass@ietf.org
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> 
> 
> 
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From derhoermi@gmx.net  Wed Oct  9 15:00:42 2013
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From: Bjoern Hoehrmann <derhoermi@gmx.net>
To: Mike Demmers <mdietf@demmers.org>
Date: Thu, 10 Oct 2013 00:00:31 +0200
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References: <20130925110934.464c7592@cicero.demmers.org> <524343B5.8010808@cs.tcd.ie> <20130930135150.23771137@cicero.demmers.org>
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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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* Mike Demmers wrote:
>TThe basic concept of default deny for encrypted emails only seems very 'right' to
>me, because if you are going to the trouble to do this, and handle things like
>key exchanges, that communication must be pretty special to begin with. Why would
>you want 'just anyone' to be able to send you encrypted emails?

I got the PGP key in my signature particularily so that strangers can
contact me in a somewhat confidential manner (that was in 1999 when I
was still in secondary education, and pretty much everybody I knew at
the time would have better ways for confidential communication, but
strangers living thousands of kilometers away lacked those options).
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

From jon.peterson@neustar.biz  Wed Oct  9 15:44:16 2013
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From: "Peterson, Jon" <jon.peterson@neustar.biz>
To: Richard Shockey <richard@shockey.us>, 'Stephen Farrell' <stephen.farrell@cs.tcd.ie>, 'perpass' <perpass@ietf.org>
Thread-Topic: [perpass] mandatory-to-implement vs. more?
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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For PSTN replacement deployments in effectively private networks, the case
for transport-level security is unconvincing, sure.

To Steve Kent's earlier point, documents that explain why strong security
is a best practice for particular environments would do better than a
blanket assertion that SIP must always use TLS. If the latter statement
were built into RFC3261, it would serve little purpose other than
rendering many implementations non-compliant with RFC3261. A BCP could
however provide the necessary motivation for using TLS in the situations
where it will actually help, and the recent revelations make that case
rather eloquently.

Jon Peterson
Neustar, Inc.

On 10/9/13 1:55 PM, "Richard Shockey" <richard@shockey.us> wrote:

>Well from a SIP perspective we have always had mandatory to implement TLS
>in
>any number of specifications but in practice no one uses it. No one.  No
>one
>cares. =20
>
>-----Original Message-----
>From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf
>Of Stephen Farrell
>Sent: Tuesday, October 08, 2013 7:13 PM
>To: Peterson, Jon; perpass
>Subject: Re: [perpass] mandatory-to-implement vs. more?
>
>
>Hi Jon,
>
>I think SIP vs. WebRTC could be a fine contrast that could shed some light
>on this, though its maybe a bit early in the latter case. Do you know if
>anyone's done a comparison between those two from the security point of
>view
>(well, between SIP deployment and WebRTC plans is probably the best that
>could be done I guess).
>
>Some more points below...
>
>On 10/08/2013 11:23 PM, Peterson, Jon wrote:
>>=20
>> Moving the bar from MTI to mandatory-to-use (can we overload the
>> acronym
>> MTU?) goes beyond just questions of policy, and into the questions of
>> how we build consensus and what the shapes the output of our
>> engineering process.
>
>I don't think I agree there. My suggestion was that we discuss whether or
>not we may have a new consensus, not a change in how we determine
>consenesus. In the event it appeared there was a new consensus on this
>list,
>that'd have to be tested more broadly before it'd impact on anything.
>
>>=20
>> Just to take an example I've followed a bit, SIP is relatively
>> successful IETF protocol. It has some notable security issues.
>
>Nice understatement;-) IMO that's quite relevant too. SIP could be at the
>same time a nice example of a successful insecure protocol and of a very
>unsuccessful security protocol. That's a bit pejorative but I guess you
>know
>what I mean.
>
>> We could have designed
>> SIP in a way that reduced the ability of middlemen to work themselves
>> into the path of SIP messages, and thus reduced the potential for
>> eavesdropping on the sessions that SIP creates - and its usefulness as
>> a tool of surveillance.
>>=20
>> Had we made some of those design decisions, however, it's unclear to
>> me that SIP would have been such a successful protocol.
>
>Well, that assumes that the SIP-proxy driven aproach that's current was
>always going to be necessary. Its clearly necessary now though so the
>middlebox aspect is a real issue here (and for HTTP).
>
>> But we wouldn't have
>> made those decisions anyway, because the relevant documents would
>> never have garnered consensus in the working groups. Our consensus
>> process reflects the aggregate of the requirements of our
>> participants, which come from many sources: employers, or regulators,
>> or academic interests, or personal consciences.
>>=20
>> If we had designed SIP to be a protocol that didn't meet those
>> requirements, of course it wouldn't see much deployment. Extensions to
>> SIP that have leaned in this direction have had little impact on the
>> protocol's use. That is the purpose of a consensus process, to reflect
>> the likely implementation and deployment community. Like it or not,
>> the participants in our consensus process want protocols like SIP to
>> be modifiable by intermediaries for numerous reasons - and once we
>> open that door, we have to understand it will be open for all comers.
>>=20
>> We could change our process so that it overrides consensus on some of
>> these crucial points. I think it would be safe to say that we already
>> do so, in a limited way, as a results of various forms of cross-area
>review.
>> As popular protocol go through our process, we levy requirements that
>> are winked at by document authors and ignored by implementers.
>
>Yeah, that's a PITA. References to RFC 4744 and RFC 3118 are my least
>favourite things to see when reviewing drafts. Both indicate that people
>are
>trying to pretend to do security, and that they're even doing that
>badly;-)
>
>That does I think make for an argument for more than MTI - if it really
>has
>to be used for the protocol to operate, then its far more likely to work
>and
>get used and have been properly engineered.
>
>> There are
>> however lines here we could cross that would result in nothing but the
>> severing of IETF work from the reality of deployment. That would not
>> serve our mission of making the Internet better.
>>=20
>> We undoubtedly need to make changes to reflect our new understanding
>> of the threats facing the Internet. I think this needs to come from
>> the bottom up, though, not from the top down.
>
>Fully agree. And that's what (I think) we're doing here. Seeing what
>really
>is new and what folks want to do about it. But maybe I'm mixed up, I've no
>idea what top-down thing you mean to be honest.
>
>> I am heartened that our
>> consensus process has elevated core security mechanisms to
>> mandatory-to-use level for some recent work, like in RTCWeb. We need
>> to shed the brightest light we can on these issues, educate the
>> community about the new risks and the practical countermeasures, and
>> then execute our consensus process as we always have. In some cases,
>> mandatory-to-use will be the right choice. In others, it won't.
>
>That's one possible outcome - to say that more-than-MTI is a valid choice
>that can be made on a protocol by protocol basis. And while that's not
>described in BCP61, the WebRTC case shows its doable aleady I guess that's
>an argument for the status quo. (Which is fine, the point for now is to
>see
>what arguments there are that might convince folks here that the status
>quo
>is or is not ok.)
>
>S.
>
>
>>=20
>> Jon Peterson
>> Neustar, Inc.
>>=20
>> On 10/8/13 2:14 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote:
>>=20
>>>
>>> Hi,
>>>
>>> Steve's mail argues for the current IETF position that
>>> mandatory-to-implement (MTI) is the correct target IETF
>>> specifications.
>>>
>>> Some folks (me included to be honest) wonder if the current situation
>>> argues for raising the bar there somewhat on the basis that MTI
>>> security features are frequently turned off or not sufficiently well
>>> tested to be usable. (Pick your favourite example, mine are usually
>>> rfc4744 or Diameter being run in clear.) And an upshot from that is
>>> that that helps those who want to pervasively monitor everything.
>>>
>>> Others argue that that'd be the IETF straying into the space of
>>> policy - all we should do is define how to use strong security
>>> features and make sure the code is there so they can be turned on and
>>> the rest is policy.
>>>
>>> I'm sure there are loads more arguments, and I do think it'd be
>>> useful to see those discussed here.
>>>
>>> Thanks,
>>> Stephen.
>>>
>>> PS: Our -00 privacy BCP doesn't go beyond MTI for now, but were there
>>> consensus for that, I think it'd be good if we could go further.
>>>
>>>
>>> _______________________________________________
>>> perpass mailing list
>>> perpass@ietf.org
>>> https://www.ietf.org/mailman/listinfo/perpass
>>=20
>>=20
>>=20
>_______________________________________________
>perpass mailing list
>perpass@ietf.org
>https://www.ietf.org/mailman/listinfo/perpass
>


From stephen.farrell@cs.tcd.ie  Wed Oct  9 16:01:05 2013
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On 10/09/2013 11:44 PM, Peterson, Jon wrote:
> A BCP could
> however provide the necessary motivation for using TLS in the situations
> where it will actually help, and the recent revelations make that case
> rather eloquently.

I'm confused by that a bit - given the GCHQ/Belgacom example, in
which situations would running SIP over TLS never help?

Note that I've not yet argued for MTU at all, so that's a real
question.

S.

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From: "Peterson, Jon" <jon.peterson@neustar.biz>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, Richard Shockey <richard@shockey.us>, 'perpass' <perpass@ietf.org>
Thread-Topic: [perpass] mandatory-to-implement vs. more?
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I suspect your confusion surrounds who exactly would be helped and what
that help would be. All I was saying is that there are deployments whose
operators and implementers don't perceive the need for such help, and that
we're unlikely to persuade them of it. Making TLS MTU for SIP would have
no appreciable impact on those environments.

Jon Peterson
Neustar, Inc.

On 10/9/13 3:59 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote:

>
>
>On 10/09/2013 11:44 PM, Peterson, Jon wrote:
>> A BCP could
>> however provide the necessary motivation for using TLS in the situations
>> where it will actually help, and the recent revelations make that case
>> rather eloquently.
>
>I'm confused by that a bit - given the GCHQ/Belgacom example, in
>which situations would running SIP over TLS never help?
>
>Note that I've not yet argued for MTU at all, so that's a real
>question.
>
>S.


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On 10/10/2013 12:21 AM, Peterson, Jon wrote:
> 
> I suspect your confusion surrounds who exactly would be helped and what
> that help would be. All I was saying is that there are deployments whose
> operators and implementers don't perceive the need for such help, 

I agree with that.

> and that
> we're unlikely to persuade them of it. 

Ah. I thought you had said that TLS wouldn't actually add value.

But you actually meant it wouldn't be perceived to add value by
those who don't perceive the need I guess, which seems a little
tautological.

> Making TLS MTU for SIP would have
> no appreciable impact on those environments.

The question is not IMO whether we declare TLS to be MTU for SIP.

For me, the question is: Nobody uses SIP/TLS now. Using SIP/TLS
would add some value. How can we make it more likely they do use
SIP/TLS?

S.

> 
> Jon Peterson
> Neustar, Inc.
> 
> On 10/9/13 3:59 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote:
> 
>>
>>
>> On 10/09/2013 11:44 PM, Peterson, Jon wrote:
>>> A BCP could
>>> however provide the necessary motivation for using TLS in the situations
>>> where it will actually help, and the recent revelations make that case
>>> rather eloquently.
>>
>> I'm confused by that a bit - given the GCHQ/Belgacom example, in
>> which situations would running SIP over TLS never help?
>>
>> Note that I've not yet argued for MTU at all, so that's a real
>> question.
>>
>> S.
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

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On 10/09/2013 09:55 PM, Richard Shockey wrote:
> Well from a SIP perspective we have always had mandatory to implement TLS in
> any number of specifications but in practice no one uses it. No one.  No one
> cares.  

BTW - thanks Rich - I think saying what really happens is very helpful.
Pretend security is IMO worse and defo much more of a PITA.

S.

> 
> -----Original Message-----
> From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf
> Of Stephen Farrell
> Sent: Tuesday, October 08, 2013 7:13 PM
> To: Peterson, Jon; perpass
> Subject: Re: [perpass] mandatory-to-implement vs. more?
> 
> 
> Hi Jon,
> 
> I think SIP vs. WebRTC could be a fine contrast that could shed some light
> on this, though its maybe a bit early in the latter case. Do you know if
> anyone's done a comparison between those two from the security point of view
> (well, between SIP deployment and WebRTC plans is probably the best that
> could be done I guess).
> 
> Some more points below...
> 
> On 10/08/2013 11:23 PM, Peterson, Jon wrote:
>>
>> Moving the bar from MTI to mandatory-to-use (can we overload the 
>> acronym
>> MTU?) goes beyond just questions of policy, and into the questions of 
>> how we build consensus and what the shapes the output of our 
>> engineering process.
> 
> I don't think I agree there. My suggestion was that we discuss whether or
> not we may have a new consensus, not a change in how we determine
> consenesus. In the event it appeared there was a new consensus on this list,
> that'd have to be tested more broadly before it'd impact on anything.
> 
>>
>> Just to take an example I've followed a bit, SIP is relatively 
>> successful IETF protocol. It has some notable security issues.
> 
> Nice understatement;-) IMO that's quite relevant too. SIP could be at the
> same time a nice example of a successful insecure protocol and of a very
> unsuccessful security protocol. That's a bit pejorative but I guess you know
> what I mean.
> 
>> We could have designed
>> SIP in a way that reduced the ability of middlemen to work themselves 
>> into the path of SIP messages, and thus reduced the potential for 
>> eavesdropping on the sessions that SIP creates - and its usefulness as 
>> a tool of surveillance.
>>
>> Had we made some of those design decisions, however, it's unclear to 
>> me that SIP would have been such a successful protocol.
> 
> Well, that assumes that the SIP-proxy driven aproach that's current was
> always going to be necessary. Its clearly necessary now though so the
> middlebox aspect is a real issue here (and for HTTP).
> 
>> But we wouldn't have
>> made those decisions anyway, because the relevant documents would 
>> never have garnered consensus in the working groups. Our consensus 
>> process reflects the aggregate of the requirements of our 
>> participants, which come from many sources: employers, or regulators, 
>> or academic interests, or personal consciences.
>>
>> If we had designed SIP to be a protocol that didn't meet those 
>> requirements, of course it wouldn't see much deployment. Extensions to 
>> SIP that have leaned in this direction have had little impact on the 
>> protocol's use. That is the purpose of a consensus process, to reflect 
>> the likely implementation and deployment community. Like it or not, 
>> the participants in our consensus process want protocols like SIP to 
>> be modifiable by intermediaries for numerous reasons - and once we 
>> open that door, we have to understand it will be open for all comers.
>>
>> We could change our process so that it overrides consensus on some of 
>> these crucial points. I think it would be safe to say that we already 
>> do so, in a limited way, as a results of various forms of cross-area
> review.
>> As popular protocol go through our process, we levy requirements that 
>> are winked at by document authors and ignored by implementers.
> 
> Yeah, that's a PITA. References to RFC 4744 and RFC 3118 are my least
> favourite things to see when reviewing drafts. Both indicate that people are
> trying to pretend to do security, and that they're even doing that badly;-)
> 
> That does I think make for an argument for more than MTI - if it really has
> to be used for the protocol to operate, then its far more likely to work and
> get used and have been properly engineered.
> 
>> There are
>> however lines here we could cross that would result in nothing but the 
>> severing of IETF work from the reality of deployment. That would not 
>> serve our mission of making the Internet better.
>>
>> We undoubtedly need to make changes to reflect our new understanding 
>> of the threats facing the Internet. I think this needs to come from 
>> the bottom up, though, not from the top down.
> 
> Fully agree. And that's what (I think) we're doing here. Seeing what really
> is new and what folks want to do about it. But maybe I'm mixed up, I've no
> idea what top-down thing you mean to be honest.
> 
>> I am heartened that our
>> consensus process has elevated core security mechanisms to 
>> mandatory-to-use level for some recent work, like in RTCWeb. We need 
>> to shed the brightest light we can on these issues, educate the 
>> community about the new risks and the practical countermeasures, and 
>> then execute our consensus process as we always have. In some cases, 
>> mandatory-to-use will be the right choice. In others, it won't.
> 
> That's one possible outcome - to say that more-than-MTI is a valid choice
> that can be made on a protocol by protocol basis. And while that's not
> described in BCP61, the WebRTC case shows its doable aleady I guess that's
> an argument for the status quo. (Which is fine, the point for now is to see
> what arguments there are that might convince folks here that the status quo
> is or is not ok.)
> 
> S.
> 
> 
>>
>> Jon Peterson
>> Neustar, Inc.
>>
>> On 10/8/13 2:14 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote:
>>
>>>
>>> Hi,
>>>
>>> Steve's mail argues for the current IETF position that 
>>> mandatory-to-implement (MTI) is the correct target IETF 
>>> specifications.
>>>
>>> Some folks (me included to be honest) wonder if the current situation 
>>> argues for raising the bar there somewhat on the basis that MTI 
>>> security features are frequently turned off or not sufficiently well 
>>> tested to be usable. (Pick your favourite example, mine are usually 
>>> rfc4744 or Diameter being run in clear.) And an upshot from that is 
>>> that that helps those who want to pervasively monitor everything.
>>>
>>> Others argue that that'd be the IETF straying into the space of 
>>> policy - all we should do is define how to use strong security 
>>> features and make sure the code is there so they can be turned on and 
>>> the rest is policy.
>>>
>>> I'm sure there are loads more arguments, and I do think it'd be 
>>> useful to see those discussed here.
>>>
>>> Thanks,
>>> Stephen.
>>>
>>> PS: Our -00 privacy BCP doesn't go beyond MTI for now, but were there 
>>> consensus for that, I think it'd be good if we could go further.
>>>
>>>
>>> _______________________________________________
>>> perpass mailing list
>>> perpass@ietf.org
>>> https://www.ietf.org/mailman/listinfo/perpass
>>
>>
>>
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

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Hi Steve,

On 10/09/2013 06:22 PM, Stephen Kent wrote:
> Stephen,
> 
> Thanks for creating a new thread to discuss this topic. It's a good
> starting point for
> 
> an important discussion.

I agree its important.

> I think MTU (vs. MTI) is a very hard argument to make, for several reasons,
> some of which I noted in my response to Dean.

Well, MTU vs MTI is not quite what the subject line says, but is
clearly one of the options worth discussing.

> Internet protocols are used in a very, very wide range of contexts,
> e.g., enterprises of various sorts, the IoT, and public environments. In
> principle one ought to make decisions about what security measures to
> deploy and enable based on a perception of threat. Threats differ in
> different contexts. Our current, MTI-based approach to security enables
> responsible parties in each environment to make decisions about what
> security to offer based on perceived threats and tradeoffs, e.g.,
> performance, processing overhead, user experience, etc.

All good.

> I admit that, in my experience, very few parties appear to make such
> decisions in a well thought-out fashion, but they could. 

That's the catch though isn't it? They don't, for whatever reason(s)
as seems to be shown by the SIP discussion.

I conclude that that means we're doing something wrong. (Maybe we're
not the only ones doing something wrong, but I do think we contribute
to the problem.)

> Suggesting that
> we can make such decisions for the folks who are ultimately responsible
> for the operation of services in a wide range of contexts strikes me
> hubristic.

Hmm. But we're happy enough to suggest that URI scheme names
can't contain a ":" and as a more relevant example, we don't have
a problem that web sockets requires a Sec-WebSocket-Key header. So
I don't buy the "we can't do that" argument to be honest.

> We've already made concessions for the Smart Grid context in the case of
> IPsec as MTI for IPv6. To me this suggests that we were persuaded that
> even MTI can be a barrier to adoption and deployment in some contexts.

But on the other hand maybe we were wrong there. Not sure myself.

> Pursuing a single set of MTUstandards for a wide range of contexts seems
> doomed to failure. 

Perhaps. But I'm not sure what a "single set of MTUstandards" means
to be honest. If we did have consensus for more than MTI then we
could clearly mess up in loads of ways;-)

> Generating MTU RFCs for various contexts might be an
> alternative. That would imply MTI protocol standards, augmented with
> BCPs. Is that what you envision?

Could be. Defo worth thinking about. Be great if folks had some
suggestions for situations where that might produce a better
outcome than we have today.

> Evaluating tradeoffs of security and privacy vs. other factors is hard
> when one deals with a wide range of contexts. For example, end user
> devices range from big servers to laptops, to tablets, to smart phones.
> Battery use if a big issue for some of these devices, as is bandwidth.
> Some of the more extreme TFS mechanisms discussed would have adverse
> implications for both. That's an example of why MTU, at the protocol
> spec levelk,
> strikes me as a bad idea.

Hm. I don't see why that applies to just this aspect of protocol
development. Sure, crypto involves some more CPU but that's not
that big a deal (far less than having the radio on in a challenged
device) and some round-trips which turns out to be a problem in
unchallenged-envirionments.

> There are a lot of middleboxes in the Internet. I am no fan of them; I'm
> a true believer in the e-t-e model for everything, not just security.
> But middleboxes are a fact of life and they exist because the folks who
> purchase equipment and offer services have found them to be operational
> necessities. Middleboxes provide ways to deal with backward
> compatibility and migration issues, broken implementations from vendors,
> security services for enterprises, network traffic engineering, etc. 

I'm surprised that you're convinced by the existence of bad practice:-)
But yes, middleboxes are there and we can't ignore that.

> If
> we argue that security against widespread nation-state surveillance is
> more important than all of these other considerations, I think we risk
> having the IETF be described as out of touch with reality.

Equally, if we ignored pervasive monitoring, we'd actaully be out of
touch with reality.

But there are definite trade-offs here. Its entirely true that we can't
improve privacy without affecting other things. One of my conclusions
from recent revelations is that we've not done a good enough job on
privacy so fixing that will involve such trade-offs if we're serious
about it and not just pretending.

S.

> 
> Steve
> 
> 
> 

From richard@shockey.us  Wed Oct  9 18:59:30 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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+1 .. unlikely is a mild word. I would have probably used the words never
persuade them.

-----Original Message-----
From: Peterson, Jon [mailto:jon.peterson@neustar.biz] 
Sent: Wednesday, October 09, 2013 7:21 PM
To: Stephen Farrell; Richard Shockey; 'perpass'
Subject: Re: [perpass] mandatory-to-implement vs. more?


I suspect your confusion surrounds who exactly would be helped and what that
help would be. All I was saying is that there are deployments whose
operators and implementers don't perceive the need for such help, and that
we're unlikely to persuade them of it. Making TLS MTU for SIP would have no
appreciable impact on those environments.

Jon Peterson
Neustar, Inc.

On 10/9/13 3:59 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote:

>
>
>On 10/09/2013 11:44 PM, Peterson, Jon wrote:
>> A BCP could
>> however provide the necessary motivation for using TLS in the 
>> situations where it will actually help, and the recent revelations 
>> make that case rather eloquently.
>
>I'm confused by that a bit - given the GCHQ/Belgacom example, in which 
>situations would running SIP over TLS never help?
>
>Note that I've not yet argued for MTU at all, so that's a real 
>question.
>
>S.


From huitema@huitema.net  Wed Oct  9 20:29:09 2013
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> For me, the question is: Nobody uses SIP/TLS now. Using SIP/TLS
> would add some value. How can we make it more likely they do use
> SIP/TLS?

Define "nobody," please. Microsoft Lync uses SIP/TLS by default. That must
be more than "nobody."

-- Christian Huitema



From stephen.farrell@cs.tcd.ie  Thu Oct 10 01:41:37 2013
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On 10/10/2013 04:28 AM, Christian Huitema wrote:
>> For me, the question is: Nobody uses SIP/TLS now. Using SIP/TLS
>> would add some value. How can we make it more likely they do use
>> SIP/TLS?
> 
> Define "nobody," please. Microsoft Lync uses SIP/TLS by default. That must
> be more than "nobody."

Apologies. I was going from Rich and Jon's statements which
I guess are more considering telco deployments. But even if
its "almost nobody," the question remains.

S.

From mdietf@demmers.org  Thu Oct 10 05:01:05 2013
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Date: Thu, 10 Oct 2013 05:00:40 -0700
From: Mike Demmers <mdietf@demmers.org>
To: Perpass List Submit <perpass@ietf.org>
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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On Thu, 10 Oct 2013 00:00:31 +0200
Bjoern Hoehrmann <derhoermi@gmx.net> wrote:

> * Mike Demmers wrote:
> >TThe basic concept of default deny for encrypted emails only seems very 'right' to
> >me, because if you are going to the trouble to do this, and handle things like
> >key exchanges, that communication must be pretty special to begin with. Why would
> >you want 'just anyone' to be able to send you encrypted emails?  
> 
> I got the PGP key in my signature particularily so that strangers can
> contact me in a somewhat confidential manner (that was in 1999 when I
> was still in secondary education, and pretty much everybody I knew at
> the time would have better ways for confidential communication, but
> strangers living thousands of kilometers away lacked those options).

If using default deny for encrypted email, they would simply have to first send you a non-encrypted email that said something like "I would like to exchange email with you confidentially and have added your address to my 'allow' list, would you add me to yours?"

Would this be a problem? Remember, this is email, and PGP - the fact that they are contacting you is not hidden in either case, just the actual content.

Of course, if you ONLY want encrypted email communications in that circumstance, you might want to just turn off default deny. I am suggesting this as a standard default, not as something required - the user must always have the choice.

In the case of someone with no previous contact, if they tried to send you encrypted email, they would get an immediate bounce with an error message something like:

550 "Email rejected because not on users whitelist. Please ask for whitelisting in an unencrypted email."

Ideally, user email programs would have some really simple ways to handle this.

-Mike

From derhoermi@gmx.net  Thu Oct 10 05:44:50 2013
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* Mike Demmers wrote:
>If using default deny for encrypted email, they would simply have to 
>first send you a non-encrypted email that said something like "I would 
>like to exchange email with you confidentially and have added your 
>address to my 'allow' list, would you add me to yours?"
>
>Would this be a problem? Remember, this is email, and PGP - the fact 
>that they are contacting you is not hidden in either case, just the 
>actual content.

Back in the day it did not seem unusual for people to know about things
like anonymous remailers or how trivial it is to manually deliver mails
by typing SMTP commands into a console, including spoofing various bits
of header data, so that did not seem that big an issue to me.

There are a couple of problems with your approach above. One is knowing
whether and when you have been added to someone's `allow` list. Another
is that people can include the encrypted message in their request to be
put on the `allow` list if they can somehow obtain the recipient's key,
rendering the request redundant. Spammers can ask to be put on the list
just like anybody else.

>In the case of someone with no previous contact, if they tried to send 
>you encrypted email, they would get an immediate bounce with an error 
>message something like:

That would be a bad default policy: can be abused to verify addresses,
disclose encrypted email policy, recover parts of the white list if the
mail system allows address spoofing, doesn't work when the receiving
system is down for maintenance for an hour or two, mails might get lost
when the sender switches addresses or uses a wrong one by accident, ...
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

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From: Phillip Hallam-Baker <hallam@gmail.com>
To: perpass <perpass@ietf.org>
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Subject: [perpass] Business cases for strong email encryption
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--089e0118293a4b017c04e862e032
Content-Type: text/plain; charset=ISO-8859-1

To make encryption work on the Web we needed a strong business case to
persuade millions of merchants to get SSL certificates. If we are going to
achieve strong email encryption we should look for similar business cases.

I have just received a note from Chase to tell me that my Amazon credit
card bill is due in 10 days. Seems they don't understand that my policy is
that I keep the float, not them. I get maybe ten similar notes a month,
none of which have the amount of the bill specified.

The reason they don't attach the invoice is that email is insecure, there
is no confidentiality. But what if they could send the email and be
confident is was confidential? Their business costs would go down.


So if there was an extended email address of the form
<user>@<domain>?<Key-ID> a sender could consult some infrastructure that
turns key ids into public keys (and validity statements) and encrypt the
message it sends to me.

For purposes of sending invoices the spam problem is easily dealt with. An
invoice sent by Chase or Amex should have a digital signature endorsed by
an EV cert at the very least. It should probably have the logotype
extension populated.


I am not sure about the separator character, # or ! also seem good. Can't
use : or , for obvious reasons, or the braces.

Could even have a scheme where we use all three:

? For encryption keys
! For Signature keys
# For Dual purpose keys

But in the PKI scheme I am thinking would back this, any key that is used
in such a fashion would be seen as a long term key used only for
endorsement of other keys rather than the encryption key itself so I don't
think we need multiple versions.

Tending towards ? as it is the 50th anniversary of Dr Who. This would make
a memorable URI form:

who:alice@example.com?TKLBE-LUOPM-SWYZ5-CNDFY-5FWWC-J6LRA

We can add in a locator version of the same value which would specify the
DNS name of a service that would resolve the identifier to a credential:

who://example.net/alice@example.com?TKLBE-LUOPM-SWYZ5-CNDFY-5FWWC-J6LRA

[This is equivalent to the news/nntp uri treatment]

Yes, I know we can do the same thing in ni, but this is user facing and so
every character in the identifier counts. Not going to repeat the OpenID
idiocy of using a URI (which was only so that someone could make money from
a poxy registry).
-- 
Website: http://hallambaker.com/

--089e0118293a4b017c04e862e032
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>To make encryption work on the Web we needed a strong=
 business case to persuade millions of merchants to get SSL certificates. I=
f we are going to achieve strong email encryption we should look for simila=
r business cases.</div>
<div><br></div><div>I have just received a note from Chase to tell me that =
my Amazon credit card bill is due in 10 days. Seems they don&#39;t understa=
nd that my policy is that I keep the float, not them. I get maybe ten simil=
ar notes a month, none of which have the amount of the bill specified.</div=
>
<div><br></div><div>The reason they don&#39;t attach the invoice is that em=
ail is insecure, there is no confidentiality. But what if they could send t=
he email and be confident is was confidential? Their business costs would g=
o down.</div>
<div><br></div><div><br></div><div>So if there was an extended email addres=
s of the form &lt;user&gt;@&lt;domain&gt;?&lt;Key-ID&gt; a sender could con=
sult some infrastructure that turns key ids into public keys (and validity =
statements) and encrypt the message it sends to me.</div>
<div><br></div><div>For purposes of sending invoices the spam problem is ea=
sily dealt with. An invoice sent by Chase or Amex should have a digital sig=
nature endorsed by an EV cert at the very least. It should probably have th=
e logotype extension populated.</div>
<br clear=3D"all"><div><br></div><div>I am not sure about the separator cha=
racter, # or ! also seem good. Can&#39;t use : or , for obvious reasons, or=
 the braces.</div><div><br></div><div>Could even have a scheme where we use=
 all three:</div>
<div><br></div><div>? For encryption keys</div><div>! For Signature keys</d=
iv><div># For Dual purpose keys</div><div><br></div><div>But in the PKI sch=
eme I am thinking would back this, any key that is used in such a fashion w=
ould be seen as a long term key used only for endorsement of other keys rat=
her than the encryption key itself so I don&#39;t think we need multiple ve=
rsions.</div>
<div><br></div><div>Tending towards ? as it is the 50th anniversary of Dr W=
ho. This would make a memorable URI form:</div><div><br></div><div><a href=
=3D"http://who:alice@example.com?TKLBE-LUOPM-SWYZ5-CNDFY-5FWWC-J6LRA">who:a=
lice@example.com?TKLBE-LUOPM-SWYZ5-CNDFY-5FWWC-J6LRA</a></div>
<div><br></div><div>We can add in a locator version of the same value which=
 would specify the DNS name of a service that would resolve the identifier =
to a credential:</div><div><br></div><div>who://<a href=3D"http://example.n=
et/alice@example.com?TKLBE-LUOPM-SWYZ5-CNDFY-5FWWC-J6LRA">example.net/alice=
@example.com?TKLBE-LUOPM-SWYZ5-CNDFY-5FWWC-J6LRA</a><br>
</div><div><br></div><div>[This is equivalent to the news/nntp uri treatmen=
t]</div><div><br></div><div>Yes, I know we can do the same thing in ni, but=
 this is user facing and so every character in the identifier counts. Not g=
oing to repeat the OpenID idiocy of using a URI (which was only so that som=
eone could make money from a poxy registry).</div>
-- <br>Website: <a href=3D"http://hallambaker.com/">http://hallambaker.com/=
</a><br>
</div>

--089e0118293a4b017c04e862e032--

From mdietf@demmers.org  Thu Oct 10 06:26:00 2013
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From: Mike Demmers <mdietf@demmers.org>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Wed, 9 Oct 2013 09:28:38 -0400
"Moriarty, Kathleen" <kathleen.moriarty@emc.com> wrote:

> But either way, the new reality seems to be that we have a demonstration that a set of governments want to pervasively monitor everything. And I'm sure there're others also trying that. And now there'll be a whole new set trying to join that club. So even the governments that want to monitor everyone else will I think soon realise that they're better off it they themselves/their citizens are less easy to monitor.

But that is only one of the major problems: The other is that these idiots are trying to turn the internet into a theater of war. They are actively attackng user systems, not just other state actors. I am not sure if they are actually building botnets of user machines to use as weapons, but they may be. At the least they are attacking routers to gain access for surveillance.

NSA has publicly _admitted_ to attacking over 200 systems. By their own definition, those are acts of war. By most of _our_ definitions, they are, at the least, hacking. Why should any of their packets be allowed on the public internet?

> I'm very simple: this is an attack on the network. If we treat it that way, and do that well, we might all win.

I heartily agree and I think this should be treated as such. All the way to the 'nuclear option', if necessary.

The threat is complex and diffuse. But consider, there is another, somewhat similar threat we have been dealing with for many years, the spam and hacker problems - and some of the specific solutions used for this have been effective.

The antispam community has made community blocklists, used to block email - very effective. Now, even whole providers can find thenselves in blocklists if they do not make an honest attempt to rid themselves of spammers. In the early days, I remember the Cyber Promotions era (Sanford Wallace) and that there was one backbone which decided to allow his business on it that was so heavily blocked and null-routed that it was, if not the cause, at least contrbutory to, its demise.

Maybe we need (voluntary) blocklists for routers, and a similar public response. 'Attack other systems, and you may find ALL your space null routed by blocklists, including nominally unrelated public sites'. Like your spy agency recruiting sites, for example.

RFX-xxxx 'Internet routers, gateways, and firewalls MUST make a good faith effort to drop packets from hosts or networks known to be deliberately attacking other hosts or networks, and SHOULD also block other packets controlled by the same entity'.

Including governments.

It would be nice if all routers had a away to use the kind of blocklists commonly used in email programs (in MTAs).

Because of the amount of spam and hacking that comes from Chinese space, I regularly just block ALL their space, unless there is a business or other good reason not to. This is on -small- business systems, of course. But there are a LOT of those. A lot more than there are large Google sized systems - people forget this. 

If I had a good blocklist for NSA space, GHCQ space, and other defense space, right now I would block it all too, for the same reasons. It's just self defense. 

We have one advantage over the bad guys, which, if we can find good ways to use it, will insure we can win: we outnumber them many, many times over. 

Blocklists are effective because many, many systems voluntariy use them. Nobody -mandated- that, but a mechanism was found to make it -easier-.

Yeah, I am a little angry... ;-) I probably shouldn't write stuff to this list after I have been up all night.

-Mike



From hallam@gmail.com  Thu Oct 10 07:00:53 2013
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--089e01228148b9927104e8636d02
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I think the problem is that many protocols are at the wrong level of
abstraction to mandate use of any security controls.

For example, consider IPSEC which at one time was mandatory to implement in
IPv6 but isn't any more because most protocols use SSL rather than IPSEC in
any case.

Should TLS be mandatory for SMTP? Well probably but what if an
implementation uses IPSEC?

The same problem comes up with SSL and HTTP. We can mandate the use of SSL
but not a mechanism to validate the certs and without that SSL has little
value.

We can mandate the use of DNSSEC but that would be counterproductive at
this point as DNSSEC is still a protocol with real deployment problems and
issues that have to be fixed before it is ready. They might have been
addressed earlier if the people involved were not so confident that
deployment was inevitable, making use mandatory would further discourage
fixing issues such as how clients get access to the DNSSEC signatures so
they can do validation.

--089e01228148b9927104e8636d02
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">I think the problem is that many protocols are at the wron=
g level of abstraction to mandate use of any security controls.<div><br></d=
iv><div>For example, consider IPSEC which at one time was mandatory to impl=
ement in IPv6 but isn&#39;t any more because most protocols use SSL rather =
than IPSEC in any case.</div>
<div><br></div><div>Should TLS be mandatory for SMTP? Well probably but wha=
t if an implementation uses IPSEC?</div><div><br></div><div>The same proble=
m comes up with SSL and HTTP. We can mandate the use of SSL but not a mecha=
nism to validate the certs and without that SSL has little value.=A0</div>
<div><br></div><div>We can mandate the use of DNSSEC but that would be coun=
terproductive at this point as DNSSEC is still a protocol with real deploym=
ent problems and issues that have to be fixed before it is ready. They migh=
t have been addressed earlier if the people involved were not so confident =
that deployment was inevitable, making use mandatory would further discoura=
ge fixing issues such as how clients get access to the DNSSEC signatures so=
 they can do validation.</div>
</div>

--089e01228148b9927104e8636d02--

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Correct in virtually all the teleco deployments of SIP it is not used.  Its
generally not used in the hosted PBX systems the teleco's deploy as well aka
Broadsoft though I'm sure you have better information on the status of
current hosted Lync deployments. Certainly some enterprises do actually turn
on the TLS function but the anecdotal evidence is a very very small
percentage. The resistance level at both the service provider and enterprise
level is actually considerable. 

For the telecos 
A. the customer demand is not there.  There may be a Government demand but
that is another question.

B.  it does represent computational costs that under the current environment
is difficult for service providers to justify from a CAPEX perspective

That said the security situation with Intercarrier SIP traffic IS a matter
under serious consideration with the IETF STIR proposition, but the problem
statement is not the security of the RTP traffic it is actually validating
the source of the call session itself.  That is going to get serious
attention since the problem centers on criminal fraud, disruption of public
safety communications and violation of the national do not call lists.
There are certainly areas where SIP security could be improved could be
improved but we are not the protocol police and IMHO any thought of a
Mandatory to Use security level will simply be ignored until the usability
factors are improved. 

Personally I find IETF discussions of Government behavior distasteful.
Frankly we have met the enemy and it is us.  The IETF ended up designing
security protocols that are very very difficult to deploy at scale.  

E-Mail encryption is the obvious problem.  Oh gee I'm really going to turn
that on if it ends up defeating the anti-spam measures.  Good luck with
that.  

-----Original Message-----
From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf
Of Stephen Farrell
Sent: Thursday, October 10, 2013 4:41 AM
To: Christian Huitema; 'Peterson, Jon'; 'Richard Shockey'; 'perpass'
Subject: Re: [perpass] mandatory-to-implement vs. more?



On 10/10/2013 04:28 AM, Christian Huitema wrote:
>> For me, the question is: Nobody uses SIP/TLS now. Using SIP/TLS would 
>> add some value. How can we make it more likely they do use SIP/TLS?
> 
> Define "nobody," please. Microsoft Lync uses SIP/TLS by default. That 
> must be more than "nobody."

Apologies. I was going from Rich and Jon's statements which I guess are more
considering telco deployments. But even if its "almost nobody," the question
remains.

S.
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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++1, Rich.

Furthermore, it's fairly clueless.  Anyone seeking
a secure universe isn't going to find it in this one.
Any given instantiation of anything has n to the nth
vulnerabilities waiting to be discovered and exploited
by someone.  Governments are among the lesser of
the threat actors.

Most of the real world has moved to risk management
conceptualizations - as is pretty obvious on this list.
Along those lines, is the new NIST SP800-53 Rev. 4
useful, and shouldn't the discussion be shifted in that
direction?

--tony



On 10/10/2013 10:36 AM, Richard Shockey wrote:
> Personally I find IETF discussions of Government behavior distasteful.
> Frankly we have met the enemy and it is us.  The IETF ended up designing
> security protocols that are very very difficult to deploy at scale.
>
> E-Mail encryption is the obvious problem.  Oh gee I'm really going to turn
> that on if it ends up defeating the anti-spam measures.  Good luck with
> that.


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Subject: Re: [perpass] mandatory-to-implement vs. more?
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I suspect the President of Brazil would be very interested in a BCP on
Mandatory to Use TLS for SIP. :-) 

 But the Government of Brazil has the Authority to Act as a protocol police,
the IETF does not. 

-----Original Message-----
From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf
Of Stephen Farrell
Sent: Wednesday, October 09, 2013 6:59 PM
To: Peterson, Jon; Richard Shockey; 'perpass'
Subject: Re: [perpass] mandatory-to-implement vs. more?



On 10/09/2013 11:44 PM, Peterson, Jon wrote:
> A BCP could
> however provide the necessary motivation for using TLS in the 
> situations where it will actually help, and the recent revelations 
> make that case rather eloquently.

I'm confused by that a bit - given the GCHQ/Belgacom example, in which
situations would running SIP over TLS never help?

Note that I've not yet argued for MTU at all, so that's a real question.

S.
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Unlikely; at least not without some back
doors.  Brazil is the leading Latin American
nation in the network surveillance business. :-)
--tony

On 10/10/2013 10:52 AM, Richard Shockey wrote:
> I suspect the President of Brazil would be very interested in a BCP on
> Mandatory to Use TLS for SIP.:-)  
>
>   But the Government of Brazil has the Authority to Act as a protocol police,
> the IETF does not.


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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Tony .. Always wonderful to hear from you!

The point we clearly agree on is that a productive discussion on this
subject would be the usability and deployability of security protocols. I
there has been a failure it lies there.  

I totally agree the concepts of risk management and ultimately reputation
management are central to mitigating the problems we now see. 

-----Original Message-----
From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf
Of Tony Rutkowski
Sent: Thursday, October 10, 2013 10:52 AM
To: Richard Shockey; 'Stephen Farrell'; 'Christian Huitema'; 'Peterson,
Jon'; 'perpass'
Subject: Re: [perpass] mandatory-to-implement vs. more?

++1, Rich.

Furthermore, it's fairly clueless.  Anyone seeking a secure universe isn't
going to find it in this one.
Any given instantiation of anything has n to the nth vulnerabilities waiting
to be discovered and exploited by someone.  Governments are among the lesser
of the threat actors.

Most of the real world has moved to risk management conceptualizations - as
is pretty obvious on this list.
Along those lines, is the new NIST SP800-53 Rev. 4 useful, and shouldn't the
discussion be shifted in that direction?

--tony



On 10/10/2013 10:36 AM, Richard Shockey wrote:
> Personally I find IETF discussions of Government behavior distasteful.
> Frankly we have met the enemy and it is us.  The IETF ended up 
> designing security protocols that are very very difficult to deploy at
scale.
>
> E-Mail encryption is the obvious problem.  Oh gee I'm really going to 
> turn that on if it ends up defeating the anti-spam measures.  Good 
> luck with that.

_______________________________________________
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From mdietf@demmers.org  Thu Oct 10 09:25:21 2013
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Date: Thu, 10 Oct 2013 09:25:04 -0700
From: Mike Demmers <mdietf@demmers.org>
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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On Thu, 10 Oct 2013 14:44:45 +0200
Bjoern Hoehrmann <derhoermi@gmx.net> wrote:

> Back in the day it did not seem unusual for people to know about things
> like anonymous remailers or how trivial it is to manually deliver mails
> by typing SMTP commands into a console, including spoofing various bits
> of header data, so that did not seem that big an issue to me.

Oh, I don't think this is _quite_ to the level of telnetting to the MTA!

How about this:

There are two new standard buttons on the MUA: FRIEND UNFRIEND

Everything possible is set up by the MUA when it is first run - keys, made, if they do not exist, questions asked and answered about keyservers, pass phrases, various preferences etc. Same as it SHOULD be now.

"Coolmail has a new feature! You can 'Friend' people, and if they also friend you, you will be communicating privately from then on. Better yet, you will see no spam in this mode (unless you friend a spammer).

It's easy to use! When someone you wish to communicate with privately emails you, just hit the friend button. This will handle everything automatically. They will be sent a plain text message with your special key. And if they also friend you, their special key will be sent to you, if you do not already have it. (all automatic). 

You can also set up this feature to automatically check the keyserver of your choice in preferences/friending" blah blah blah..."

Something like that. Does not seem hard to me. Probably a bit less hard than learning how to add an attachment to an email, most everyone learns to do that.

You just have to hit one button, all else is handled automatically. 

> There are a couple of problems with your approach above. One is knowing
> whether and when you have been added to someone's `allow` list. 

Works just like now: If you are on the whitelist, your mail just goes through. If not, you get a bounce.

As it works now: My mail goes through, unless someone has me blocked, in which case I get a bounce.

People are quite familiar with bounces.

> Another
> is that people can include the encrypted message in their request to be
> put on the `allow` list if they can somehow obtain the recipient's key,
> rendering the request redundant. 

But it won't be decoded, because it is not marked as encrypted email. If you are trying to spam me this way, I will not see it, so what is the point? Optionally I could just drop all such messages, as part of the normal spam filtering. A friend request with an encrypted section is invalid.

This is just ordinary non encrypted email far as the MTA system knows, and normal antispam measures will be applied.

The best way to get me to add someone to my allow list would be a plain email asking for that (perhaps with a reason so I can judge whether they are a spammer or not) but then don't worry about keys, just hit the friend button and let the system handle the key exchanges.

>Spammers can ask to be put on the list
> just like anybody else.

They can, but why would I add them? This is intended to be private email - friends, family, work, special people. The plain text mail system will still work just as now, for other purposes. 

It is also very likely that message from a spammer will be dropped by a blocklist long before I could see it. Most spam is either sent from (pretty quickly) known spam netblocks, or from hacked user machines, which are generally in ISP spaces labeled as such and mostly blocked (if you have any reasonable anti-spam system in place).

Another factor is that spammers just won't, for the most part, be willing to go through such a two step process. For one thing, most will be -technically- unable to do so, because they are using hacked systems and this setup requires a reply from the actual sender to work. That simply cannot happen for most spam, because it is using forged addresses in the from lines, most often to completely different systems.

-Friending is not complete until both sides have done the exchange.-

This is a bit like confirmed email lists. Spammers could get on my lists if they really tried, but what I actually see is that they do not go past the first step - they just try to send some spam, if that does not work, they just move on. Too much work for them.

OK, so...just checking the steps...

I get plain email requesting friend status.
I hit friend button, friend request is sent to original user, I am in half-completed friend state.
Remote user gets request, half friend status, hits friend button, sends friend request, marks as completed.
I get friend request, hit friend button, mark as completed.

I think that should work. An active friend button hit is required from both sides to complete. There had to be valid return addresses on both sides for this to work.


> >In the case of someone with no previous contact, if they tried to send 
> >you encrypted email, they would get an immediate bounce with an error 
> >message something like:  

> That would be a bad default policy: can be abused to verify addresses,

No different than how email works right now. How is a bounce from this any different from a bounce for any other reason?

If you are a spammer you are sending out millions of emails. To verify an address is in my 'inner circle', you would have to try, what, 200 million or so guesses, of which about 1,999,990 would be negative.

Not likely to happen.

> disclose encrypted email policy, 

The policy is default deny. Pefectly public. Why not? Right now the default policy for -all- mail is default accept, and everyone knows this. 

That is all they can learn from this. The exact same bounce for every single email they try. Millions to get one good one. Defeats the cost basis of spamming.

> recover parts of the white list if the
> mail system allows address spoofing,

Again, millions to test. No spammer will do this. Most MTAs have limits on the number of addresses that can be tried, this is because spammers try to do that now with the existing mail system - this is no different and the same defenses apply.

Now, if they happen to KNOW the address of one of my 'friends', they could send me spam IF my key was in a public keyserver or they got it from an email sent from me, AND they forged the sending address.

A defense against that situation would be to have two sets of keys, one for initial contact that might be given out in an email, and once a secure setup was established, change to a second very private 'public' key, with the key exchange going through the already encrypted emails. This is kind of like how ssh works, I create 'public' keys for servers, but do NOT want those in a public keyserver or in emails. They are sort of private, public keys. 

> doesn't work when the receiving
> system is down for maintenance for an hour or two, 

No, perhaps you do not understand that this is blocking done by the MTA, not the MUA. If the MTA goes down, exactly the same thing happens that happens now: The mail is requeued by the sending MTA and sent later when the receiving MTA is back up. No difference from now.

> mails might get lost
> when the sender switches addresses or uses a wrong one by accident, ...

Same as the existng system. User will get a bounce. They just need to 'friend' the new address. Or correct their error. Just like when you make a typo in an email address. Nothing will be lost. -This is not filtering.- It is mail bounces, done at the MTA, specifically because that insures against such things. The feedback is very fast to the user.

The changes to the mail system are extremely minor. The mailserver has a new way to handle the metadata that an email is encrypted - this is the only new feature change in the MTA. It is set to default deny for encrypted emails, using the existing system (same as used for anti-spam now) and to whitelist certain encrypted emails from that - again using the existing system. Everything else is unchanged, there is no more risk of losing emails or any other mail problem than there is now. For many different reasons, an email may bounce now - we have just added one new reason; a bounce is still a bounce and is handled exactly the same way.

The purpose here is to give the average user a reason to use encryption (anti-spam, some privacy where you especially want it). And to make it so easy to use that many people will.

It helps by at least providing some privacy for the user, and helps us all by the fact that if many people are using encryption, it changes the situation where if you are using encryption, that alone is cause for suspicion.

It does nothing to help the metadata problems of email, and no doubt NSA etc could MITM it pretty easily. But it's work to do that. And if it is encrypted, they cannot do trivial searches on plain text to accuse me of being a terrorist because I happened to need a new seal for my pressure cooker. They at least have to get my keys somehow and decode it, or MITM me. If they want me that bad, I figure I am toast anyway.

All the 'perfect' encryption in the world is useless if no one uses it, the way it is now. 

Get everyone on board, and I am sure things can be improved in time.

-Mike


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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Ben,
> Yeah, I don't think that's the answer. I think the answer is more
> along the lines of products not taking the attitude that they should
> work around everyone's broken crap, but instead that they should take
> a hard line.
Amen! But, I so rarely see that attitude among vendors.
> In short, "be liberal in what you accept" was a terrible idea for
> security and its time we dropped it.
I have long said the same re security, even when Jon and I served together
on the IAB. But, as I noted in my reply to Stephen Farrell, we have 
middleboxes
that are part of today's (and yesterday's and tomorrow's) reality. They 
are not
a potential impediment, they are real, and they impose some limits on 
what we _can_ do
technically, in addition to what we _might_ do even if we were confident 
that the vast
majority of users want to accept some inconvenience in the name of 
improved privacy.
> ...
> But this is exactly the problem: 99% of the time you don't care, so 
> you argue that we should make it impossible to fix your problem in the 
> other 1% of cases.
I did not make that argument. I did argue that we ought not impose 
degraded user
experiences on 99% of the users, all the time, to enable some users 
(probably much less that 1%)
to have high quality, covert communications.
> I think the new reality is that you should worry about the 1% of the
> time you care and put up with whatever slight hardships it brings for
> your 99% case.
Not my reality :-).

Steve


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<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Ben,
    <blockquote
cite="mid:CABrd9SRb7JctxdLUWS9QAv+ApK8MNzMhBSxoDEfY-AbbQeJn5w@mail.gmail.com"
      type="cite">
      <pre wrap="">Yeah, I don't think that's the answer. I think the answer is more
along the lines of products not taking the attitude that they should
work around everyone's broken crap, but instead that they should take
a hard line.</pre>
    </blockquote>
    Amen! But, I so rarely see that attitude among vendors.<br>
    <blockquote
cite="mid:CABrd9SRb7JctxdLUWS9QAv+ApK8MNzMhBSxoDEfY-AbbQeJn5w@mail.gmail.com"
      type="cite">
      <pre wrap="">In short, "be liberal in what you accept" was a terrible idea for
security and its time we dropped it.</pre>
    </blockquote>
    I have long said the same re security, even when Jon and I served
    together<br>
    on the IAB. But, as I noted in my reply to Stephen Farrell, we have
    middleboxes<br>
    that are part of today's (and yesterday's and tomorrow's) reality.
    They are not<br>
    a potential impediment, they are real, and they impose some limits
    on what we <u>can</u> do<br>
    technically, in addition to what we <u>might</u> do even if we were
    confident that the vast <br>
    majority of users want to accept some inconvenience in the name of
    improved privacy.<br>
    <blockquote
cite="mid:CABrd9SRb7JctxdLUWS9QAv+ApK8MNzMhBSxoDEfY-AbbQeJn5w@mail.gmail.com"
      type="cite">...</blockquote>
    <blockquote
cite="mid:CABrd9SRb7JctxdLUWS9QAv+ApK8MNzMhBSxoDEfY-AbbQeJn5w@mail.gmail.com"
      type="cite">But this is exactly the problem: 99% of the time you
      don't care, so
      you argue that we should make it impossible to fix your problem in
      the
      other 1% of cases.</blockquote>
    I did not make that argument. I did argue that we ought not impose
    degraded user<br>
    experiences on 99% of the users, all the time, to enable some users
    (probably much less that 1%)<br>
    to have high quality, covert communications.<br>
    <blockquote
cite="mid:CABrd9SRb7JctxdLUWS9QAv+ApK8MNzMhBSxoDEfY-AbbQeJn5w@mail.gmail.com"
      type="cite">
      <pre wrap="">I think the new reality is that you should worry about the 1% of the
time you care and put up with whatever slight hardships it brings for
your 99% case.</pre>
    </blockquote>
    Not my reality&nbsp;<span class="moz-smiley-s1"><span> :-)</span></span>.
    <br>
    <br>
    Steve<br>
    <blockquote
cite="mid:CABrd9SRb7JctxdLUWS9QAv+ApK8MNzMhBSxoDEfY-AbbQeJn5w@mail.gmail.com"
      type="cite">
    </blockquote>
    <br>
  </body>
</html>

--------------070605040208020001030203--

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Stephen,
> Well, MTU vs MTI is not quite what the subject line says, but is
> clearly one of the options worth discussing.
I thought that was the focus, based on the subject line. Sorry.
>> I admit that, in my experience, very few parties appear to make such
>> decisions in a well thought-out fashion, but they could.
> That's the catch though isn't it? They don't, for whatever reason(s)
> as seems to be shown by the SIP discussion.
In my experience, enterprise IT folks want to deploy a "solution"
that has low capital cost and low cost to maintain, and that is
perceived as 'best practice" relative to their industry. This is
consistent with some of Dean's observations. Being truly effective
against legitimate threats often is not on their checklist :-) .
> I conclude that that means we're doing something wrong. (Maybe we're
> not the only ones doing something wrong, but I do think we contribute
> to the problem.)
I don 't think we're doing anything  wrong; we're makers of standards,
not enforcers of good security practices for every business, academic
institution, service provider, and individual user of the Internet.
> Hmm. But we're happy enough to suggest that URI scheme names
> can't contain a ":" and as a more relevant example, we don't have
> a problem that web sockets requires a Sec-WebSocket-Key header. So
> I don't buy the "we can't do that" argument to be honest.
Sorry, but I don't see the analogy. These are MTI examples, and the first
is a technical compatibility issue, right?
> Pursuing a single set of MTUstandards for a wide range of contexts seems
> doomed to failure.
> Perhaps. But I'm not sure what a "single set of MTUstandards" means
> to be honest. If we did have consensus for more than MTI then we
> could clearly mess up in loads of ways;-)
By "single set" I mean MTUs that apply to a standard irrespective
of its use context.
>> Evaluating tradeoffs of security and privacy vs. other factors is hard
>> when one deals with a wide range of contexts. For example, end user
>> devices range from big servers to laptops, to tablets, to smart phones.
>> Battery use if a big issue for some of these devices, as is bandwidth.
>> Some of the more extreme TFS mechanisms discussed would have adverse
>> implications for both. That's an example of why MTU, at the protocol
>> spec levelk,
>> strikes me as a bad idea.
> Hm. I don't see why that applies to just this aspect of protocol
> development. Sure, crypto involves some more CPU but that's not
> that big a deal (far less than having the radio on in a challenged
> device) and some round-trips which turns out to be a problem in
> unchallenged-envirionments.
Fair point; tradeoffs are part of every protocol design, not just
security vs. X tradeoffs. I think that we usually have adequate IETF
participation by folks who are well-positioned to analyze _most_ 
protocol design
tradeoffs. However, we have some significant examples where that has not 
been true.
The first DNSSEC design, approved as a set of RFCs, was not workable. We 
had to
try again, and that cost us several years of effort. I am not convinced 
that we
have the right set of folks participating to design sweeping changes 
that _mandate _
use of security mechanisms that are good enough to deal with nation 
state surveillance.
> Equally, if we ignored pervasive monitoring, we'd actaully be out of
> touch with reality.
For a long time the IETF has offered security mechanisms that can be
used to protect a wide range of users against a broad spectrum of attacks.
We know that use of many of these mechanisms is very minimal in many 
(most?) contexts.
How does that experience justify mandating _use_ of additional, new 
mechanisms?
Let's not assume that the concern over pervasive monitoring that is
triggering our discussions, and which is well-represented on this list, is
necessarily representative of the concerns (priorities) of most users. When
folks stop posting TMI info on Facebook, updating their locations via
social media, and give up many, many other privacy-undermining habits, 
then I'll
be ready to believe that their priorities have shifted.

Steve

--------------010009080008040407060705
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Content-Transfer-Encoding: 7bit

<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Stephen,<br>
    <blockquote cite="mid:5255EC1D.5040006@cs.tcd.ie" type="cite">
      <pre wrap="">Well, MTU vs MTI is not quite what the subject line says, but is
clearly one of the options worth discussing.</pre>
    </blockquote>
    I thought that was the focus, based on the subject line. Sorry.
    <blockquote cite="mid:5255EC1D.5040006@cs.tcd.ie" type="cite">
      <blockquote type="cite">
        <pre wrap="">I admit that, in my experience, very few parties appear to make such
decisions in a well thought-out fashion, but they could. 
</pre>
      </blockquote>
      <pre wrap="">
That's the catch though isn't it? They don't, for whatever reason(s)
as seems to be shown by the SIP discussion.</pre>
    </blockquote>
    In my experience, enterprise IT folks want to deploy a "solution"<br>
    that has low capital cost and low cost to maintain, and that is<br>
    perceived as 'best practice" relative to their industry. This is<br>
    consistent with some of Dean's observations. Being truly effective<br>
    against legitimate threats often is not on their checklist <span
      class="moz-smiley-s1"><span> :-) </span></span>.<br>
    <blockquote cite="mid:5255EC1D.5040006@cs.tcd.ie" type="cite">
      <pre wrap="">I conclude that that means we're doing something wrong. (Maybe we're
not the only ones doing something wrong, but I do think we contribute
to the problem.)</pre>
    </blockquote>
    I don 't think we're doing anything&nbsp; wrong; we're makers of
    standards,<br>
    not enforcers of good security practices for every business,
    academic<br>
    institution, service provider, and individual user of the Internet.<br>
    <blockquote cite="mid:5255EC1D.5040006@cs.tcd.ie" type="cite">
      <pre wrap="">Hmm. But we're happy enough to suggest that URI scheme names
can't contain a ":" and as a more relevant example, we don't have
a problem that web sockets requires a Sec-WebSocket-Key header. So
I don't buy the "we can't do that" argument to be honest.</pre>
    </blockquote>
    Sorry, but I don't see the analogy. These are MTI examples, and the
    first<br>
    is a technical compatibility issue, right?
    <blockquote cite="mid:5255EC1D.5040006@cs.tcd.ie" type="cite">
      <pre wrap="">Pursuing a single set of MTUstandards for a wide range of contexts seems
doomed to failure. 
</pre>
      <pre wrap="">
Perhaps. But I'm not sure what a "single set of MTUstandards" means
to be honest. If we did have consensus for more than MTI then we
could clearly mess up in loads of ways;-)</pre>
    </blockquote>
    By "single set" I mean MTUs that apply to a standard irrespective<br>
    of its use context.<br>
    <blockquote cite="mid:5255EC1D.5040006@cs.tcd.ie" type="cite">
      <blockquote type="cite">
        <pre wrap="">Evaluating tradeoffs of security and privacy vs. other factors is hard
when one deals with a wide range of contexts. For example, end user
devices range from big servers to laptops, to tablets, to smart phones.
Battery use if a big issue for some of these devices, as is bandwidth.
Some of the more extreme TFS mechanisms discussed would have adverse
implications for both. That's an example of why MTU, at the protocol
spec levelk,
strikes me as a bad idea.
</pre>
      </blockquote>
      <pre wrap="">
Hm. I don't see why that applies to just this aspect of protocol
development. Sure, crypto involves some more CPU but that's not
that big a deal (far less than having the radio on in a challenged
device) and some round-trips which turns out to be a problem in
unchallenged-envirionments.</pre>
    </blockquote>
    Fair point; tradeoffs are part of every protocol design, not just<br>
    security vs. X tradeoffs. I think that we usually have adequate IETF
    <br>
    participation by folks who are well-positioned to analyze <u>most</u>
    protocol design<br>
    tradeoffs. However, we have some significant examples where that has
    not been true. <br>
    The first DNSSEC design, approved as a set of RFCs, was not
    workable. We had to <br>
    try again, and that cost us several years of effort. I am not
    convinced that we <br>
    have the right set of folks participating to design sweeping changes
    that <u>mandate </u><br>
    use of security mechanisms that are good enough to deal with nation
    state surveillance.<br>
    <blockquote cite="mid:5255EC1D.5040006@cs.tcd.ie" type="cite">
      <pre wrap="">Equally, if we ignored pervasive monitoring, we'd actaully be out of
touch with reality.</pre>
    </blockquote>
    For a long time the IETF has offered security mechanisms that can be<br>
    used to protect a wide range of users against a broad spectrum of
    attacks. <br>
    We know that use of many of these mechanisms is very minimal in many
    (most?) contexts. <br>
    How does that experience justify mandating <u>use</u> of
    additional, new mechanisms? <br>
    Let's not assume that the concern over pervasive monitoring that is<br>
    triggering our discussions, and which is well-represented on this
    list, is <br>
    necessarily representative of the concerns (priorities) of most
    users. When<br>
    folks stop posting TMI info on Facebook, updating their locations
    via<br>
    social media, and give up many, many other privacy-undermining
    habits, then I'll <br>
    be ready to believe that their priorities have shifted.<br>
    <br>
    Steve<br>
  </body>
</html>

--------------010009080008040407060705--

From stephen.farrell@cs.tcd.ie  Thu Oct 10 11:52:02 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On 10/10/2013 04:11 PM, Richard Shockey wrote:
> Tony .. Always wonderful to hear from you!
> 
> The point we clearly agree on is that a productive discussion on this
> subject would be the usability and deployability of security protocols. I
> there has been a failure it lies there.  

I think the above is somewhat fair. We have tended to have only
the crap-or-no security version of protocols and the (ideally)
highly-secure version, which makes a good bit of sense in many
ways but perhaps less when one considers pervasive monitoring.

But personally I don't buy that that exaplains everything. We are
still faced with a bunch of cases where we have MTI security in
specs and its just not deployed. For example, there are no user
interface issues between SIP proxies, and deploying TLS just
should not be hard for such server-server interactions - you'd
nearly have to go out of your way as an implementer to make it
hard I think. (Assuming you start implementing it:-) Maybe as
Jon said the need just wasn't perceived for one reason or
another, but I reckon today's new situation might change that
somewhat.

In any case, mandating strong MTI security just hasn't by
itself worked well enough in some cases for whatever reason.

So... what can we change to make it more likely that good
security and privacy features are specified and deployed?

S.

From stephen.farrell@cs.tcd.ie  Thu Oct 10 12:14:10 2013
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Hiya,

On 10/10/2013 07:49 PM, Stephen Kent wrote:
> Stephen,
>> Well, MTU vs MTI is not quite what the subject line says, but is
>> clearly one of the options worth discussing.
> I thought that was the focus, based on the subject line. Sorry.

Partly my fault, but I reckon there should be more options than
just an MTI->MTU transition. For example, requiring BCPs as you
suggested, or maybe requiring (some) security be on-by-default
in some cases or lots of other things. I'm hoping to get folks
suggestions and opinions (so please send yours!)

>>> I admit that, in my experience, very few parties appear to make such
>>> decisions in a well thought-out fashion, but they could.
>> That's the catch though isn't it? They don't, for whatever reason(s)
>> as seems to be shown by the SIP discussion.
> In my experience, enterprise IT folks want to deploy a "solution"
> that has low capital cost and low cost to maintain, and that is
> perceived as 'best practice" relative to their industry. This is
> consistent with some of Dean's observations. Being truly effective
> against legitimate threats often is not on their checklist :-) .

Yup. Veniality does win sometimes;-)

>> I conclude that that means we're doing something wrong. (Maybe we're
>> not the only ones doing something wrong, but I do think we contribute
>> to the problem.)
> I don 't think we're doing anything  wrong; we're makers of standards,
> not enforcers of good security practices for every business, academic
> institution, service provider, and individual user of the Internet.

I disagree. IMO all the snowdonia stuff is very good evidence that
we need to do better. And "enforcer" is not at issue.

>> Hmm. But we're happy enough to suggest that URI scheme names
>> can't contain a ":" and as a more relevant example, we don't have
>> a problem that web sockets requires a Sec-WebSocket-Key header. So
>> I don't buy the "we can't do that" argument to be honest.
> Sorry, but I don't see the analogy. These are MTI examples, and the first
> is a technical compatibility issue, right?

And the 2nd. But the 2nd is a case where there's a teeny bit of
crypto baked into websockets so that websockets just doesn't
work without it. But not one to rathole on.

>> Pursuing a single set of MTUstandards for a wide range of contexts seems
>> doomed to failure.
>> Perhaps. But I'm not sure what a "single set of MTUstandards" means
>> to be honest. If we did have consensus for more than MTI then we
>> could clearly mess up in loads of ways;-)
> By "single set" I mean MTUs that apply to a standard irrespective
> of its use context.

Ack.

>>> Evaluating tradeoffs of security and privacy vs. other factors is hard
>>> when one deals with a wide range of contexts. For example, end user
>>> devices range from big servers to laptops, to tablets, to smart phones.
>>> Battery use if a big issue for some of these devices, as is bandwidth.
>>> Some of the more extreme TFS mechanisms discussed would have adverse
>>> implications for both. That's an example of why MTU, at the protocol
>>> spec levelk,
>>> strikes me as a bad idea.
>> Hm. I don't see why that applies to just this aspect of protocol
>> development. Sure, crypto involves some more CPU but that's not
>> that big a deal (far less than having the radio on in a challenged
>> device) and some round-trips which turns out to be a problem in
>> unchallenged-envirionments.
> Fair point; tradeoffs are part of every protocol design, not just
> security vs. X tradeoffs. I think that we usually have adequate IETF
> participation by folks who are well-positioned to analyze _most_
> protocol design
> tradeoffs. However, we have some significant examples where that has not
> been true.
> The first DNSSEC design, approved as a set of RFCs, was not workable. We
> had to
> try again, and that cost us several years of effort. I am not convinced
> that we
> have the right set of folks participating to design sweeping changes
> that _mandate _
> use of security mechanisms that are good enough to deal with nation
> state surveillance.

Going back to a mail from Yoav a few weeks ago - we're not trying to
prevent state surveillance, but we would like to make it more
expensive so Yoav isn't on the list of folks that they can afford
to surveil. Assuming we share that description as a goal, (do we?)
what other kind of folks do you think we might need to make progress
on that?

>> Equally, if we ignored pervasive monitoring, we'd actaully be out of
>> touch with reality.
> For a long time the IETF has offered security mechanisms that can be
> used to protect a wide range of users against a broad spectrum of attacks.
> We know that use of many of these mechanisms is very minimal in many
> (most?) contexts.
> How does that experience justify mandating _use_ of additional, new
> mechanisms?
> Let's not assume that the concern over pervasive monitoring that is
> triggering our discussions, and which is well-represented on this list, is
> necessarily representative of the concerns (priorities) of most users. When
> folks stop posting TMI info on Facebook, updating their locations via
> social media, and give up many, many other privacy-undermining habits,
> then I'll
> be ready to believe that their priorities have shifted.

There is a fair point there but dealing with what people do on FB
is not really within the IETF's scope I think. Making it harder for
a few hacked nodes to record everything everyone does is though.
(And if we can do that well, I suspect we'll get a bunch of other
security benefits too.)

And there's also the user-consent issue - regardless of what one
thinks about web site T&C, it is absolutely the case that users
have not given permission for the pervasive monitoring that's
been reported.

Cheers,
S.

> 
> Steve
> 

From brian.e.carpenter@gmail.com  Thu Oct 10 12:24:41 2013
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Phill,

On 11/10/2013 03:00, Phillip Hallam-Baker wrote:
> I think the problem is that many protocols are at the wrong level of
> abstraction to mandate use of any security controls.
> 
> For example, consider IPSEC which at one time was mandatory to implement in
> IPv6 but isn't any more because most protocols use SSL rather than IPSEC in
> any case.

Please let's be accurate. The reason that IPsec was a MUST in RFC 4294
but became a SHOULD in RFC 6434 was nothing to do with SSL:

  "This document recognizes that there exists a range of device types
   and environments where approaches to security other than IPsec can be
   justified.  For example, special-purpose devices may support only a
   very limited number or type of applications, and an application-
   specific security approach may be sufficient for limited management
   or configuration capabilities.  Alternatively, some devices may run
   on extremely constrained hardware (e.g., sensors) where the full
   IPsec Architecture is not justified."

Also, it was clear from the start that IPsec for IPv6 was MTI, not MTU,
and the downgrade to RTI (recommended to implement) was to allow for low
end devices where the code would never be used anyway.

   Brian

From rutkowski.tony@gmail.com  Thu Oct 10 12:42:59 2013
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Date: Thu, 10 Oct 2013 15:42:20 -0400
From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Probably not a shared goal.

State surveillance has been a "mandate" since the
inception of communications - postal, long before
electronic.  Essentially ever nation engages in it.
Most users don't care.  Some welcome it. Few users
will pay the price or accept the contraints to mitigate it.
Even fewer providers will go out of business to avoid
it.  In most instances involving individuals, the State
threat represents a far less a danger than other actors.
The obvious exceptions are industrial espionage and
cyberwarfare.

The paranoid should climb inside a sealed mu-metal
box with a Faraday shield around it and never exit.

--tony




On 10/10/2013 3:09 PM, Stephen Farrell wrote:
> Going back to a mail from Yoav a few weeks ago - we're not trying to
> prevent state surveillance, but we would like to make it more
> expensive so Yoav isn't on the list of folks that they can afford
> to surveil. Assuming we share that description as a goal, (do we?)
> what other kind of folks do you think we might need to make progress
> on that?


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Subject: Re: [perpass] mandatory-to-implement vs. more?
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-----Original Message-----
From: Stephen Farrell [mailto:stephen.farrell@cs.tcd.ie] 
Sent: Thursday, October 10, 2013 2:51 PM
To: Richard Shockey; 'perpass'
Subject: Re: [perpass] mandatory-to-implement vs. more?



On 10/10/2013 04:11 PM, Richard Shockey wrote:
> Tony .. Always wonderful to hear from you!
> 
> The point we clearly agree on is that a productive discussion on this 
> subject would be the usability and deployability of security 
> protocols. I there has been a failure it lies there.

I think the above is somewhat fair. We have tended to have only the
crap-or-no security version of protocols and the (ideally) highly-secure
version, which makes a good bit of sense in many ways but perhaps less when
one considers pervasive monitoring.

[RS> ]  A very thoughtful point.  Once we looked at the highly-secure
versions of protocols we inadvertently injected complexity and a difficulty
to implement that caused folks to go .. "WTF I just need this to work."  If
I turn off FOO by default will it work? And we know the answer to that. 

But personally I don't buy that that exaplains everything. 

[RS> ]   I'd never suggest it does. Also a lot of people really don't care
or they actually don't mind a certain level of pervasive surveillance if
there is some rational oversight.  Its not just communications protocols.
London has more CCTV cameras per capita than any city on earth.   RFID tags
on cars can track every conceivable movement.  Forget call detail records..
think of the HLR/VLR/HSS  records on mobile devices. We can go on here but
that is fruitless discussion.  

We are still faced with a bunch of cases where we have MTI security in specs
and its just not deployed. For example, there are no user interface issues
between SIP proxies, and deploying TLS just should not be hard for such
server-server interactions - you'd nearly have to go out of your way as an
implementer to make it hard I think. (Assuming you start implementing it:-) 

[RS> ] Or you don't write the checks...Shockey's law "Money is the answer
what is the question.?"  Look when brother Peterson I and countless others
started working on SIP we idealistically thought we could "replace" the
phone networks. We never envisioned SIP would BECOME the phone network.
When I and others worked on 6116 we thought one thing... the result was
"WHAT!!!  You mean this is really a SS7 TCAP replacement?"   Oh well..  the
best laid plans of mice and engineers. 

Maybe as Jon said the need just wasn't perceived for one reason or another,
but I reckon today's new situation might change that somewhat.

In any case, mandating strong MTI security just hasn't by itself worked well
enough in some cases for whatever reason.

So... what can we change to make it more likely that good security and
privacy features are specified and deployed?

[RS> ]  Well one thing is actually start to enforce "running code"
requirements on new security related protocols.  That is an ongoing debate
in the community well worth expanding on.  We've hit the potholes enough
times where usability and deployability were not mandatory considerations in
the protocol design process.  I would argue now that "pretty good security"
might actually be pretty good vs the alternative which is nothing.  


S.

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From hallam@gmail.com  Thu Oct 10 14:20:30 2013
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From: Phillip Hallam-Baker <hallam@gmail.com>
To: perpass <perpass@ietf.org>
Content-Type: multipart/alternative; boundary=047d7b3a83d498c3a704e86991de
Subject: [perpass] PKCS#12 needs fix'n
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Looking at some comments from Peter Guttman from way back he reports having
a large collection of PKCS#12 files with private keys and no password.

Ooops

So I am wondering if this might be one of the holes being exploited? It
would be consistent with a lot of what we have heard.

There seem to be several issues

1) Chronic usability issues on Windows re PFX PKCS#12 which leads users to
export without a password

2) Weak cipher suites. The strongest seems to be 3DES, I suspect the
default is RC4 which is one of the ciphers I trust least right now.


The ciphersuites issue seems to be a real problem. PKCS#12 does not use
standard identifiers so a new one has to be cut each time and because it is
a low priority it tends to lag. It is also unnecessarily captive to the
legacy base.

There is a draft to update PKCS#12 and to put it under IETF control. I
think it needs to be given a higher priority (the draft has expired BTW).

It could also do to have some examples. I am finding the draft very opaque
without.

http://tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01


-- 
Website: http://hallambaker.com/

--047d7b3a83d498c3a704e86991de
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<div dir=3D"ltr"><div>Looking at some comments from Peter Guttman from way =
back he reports having a large collection of PKCS#12 files with private key=
s and no password.=A0</div><div><br></div><div>Ooops</div><div><br></div><d=
iv>
So I am wondering if this might be one of the holes being exploited? It wou=
ld be consistent with a lot of what we have heard.</div><div><br></div><div=
>There seem to be several issues</div><div><br></div><div>1) Chronic usabil=
ity issues on Windows re PFX PKCS#12 which leads users to export without a =
password</div>
<div><br></div><div>2) Weak cipher suites. The strongest seems to be 3DES, =
I suspect the default is RC4 which is one of the ciphers I trust least righ=
t now.</div><div><br></div><div><br></div><div>The ciphersuites issue seems=
 to be a real problem. PKCS#12 does not use standard identifiers so a new o=
ne has to be cut each time and because it is a low priority it tends to lag=
. It is also unnecessarily captive to the legacy base.</div>
<div><br></div><div>There is a draft to update PKCS#12 and to put it under =
IETF control. I think it needs to be given a higher priority (the draft has=
 expired BTW).</div><div><br></div><div>It could also do to have some examp=
les. I am finding the draft very opaque without.</div>
<div><br></div><div><a href=3D"http://tools.ietf.org/html/draft-moriarty-pk=
cs12v1-1-01">http://tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01</a><br=
></div><div><br clear=3D"all"><div><br></div>-- <br>Website: <a href=3D"htt=
p://hallambaker.com/">http://hallambaker.com/</a><br>

</div></div>

--047d7b3a83d498c3a704e86991de--

From kathleen.moriarty@emc.com  Thu Oct 10 14:28:01 2013
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From: "Moriarty, Kathleen" <kathleen.moriarty@emc.com>
To: Phillip Hallam-Baker <hallam@gmail.com>, perpass <perpass@ietf.org>
Date: Thu, 10 Oct 2013 17:27:21 -0400
Thread-Topic: [perpass] PKCS#12 needs fix'n
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Subject: Re: [perpass] PKCS#12 needs fix'n
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Hello,

I should have a new version of the draft out soon, hopefully before the nex=
t meeting.  My working version has incorporated most of the adjustments req=
uested by the sponsoring AD and the document shepherd.  I am just waiting o=
n some language on transferring change control to ensure this is done prope=
rly.  We will get this version transferred and then updates can be made in =
a new document to revise as needed.

It does have a high priority, but we need to do this correctly so that ther=
e are no issues with the transfer.  I chose to let it expire rather than pr=
ovide an update without the right language in the document for the transfer=
, since this would happen soon.

Thank you,
Kathleen

From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf =
Of Phillip Hallam-Baker
Sent: Thursday, October 10, 2013 5:20 PM
To: perpass
Subject: [perpass] PKCS#12 needs fix'n

Looking at some comments from Peter Guttman from way back he reports having=
 a large collection of PKCS#12 files with private keys and no password.

Ooops

So I am wondering if this might be one of the holes being exploited? It wou=
ld be consistent with a lot of what we have heard.

There seem to be several issues

1) Chronic usability issues on Windows re PFX PKCS#12 which leads users to =
export without a password

2) Weak cipher suites. The strongest seems to be 3DES, I suspect the defaul=
t is RC4 which is one of the ciphers I trust least right now.


The ciphersuites issue seems to be a real problem. PKCS#12 does not use sta=
ndard identifiers so a new one has to be cut each time and because it is a =
low priority it tends to lag. It is also unnecessarily captive to the legac=
y base.

There is a draft to update PKCS#12 and to put it under IETF control. I thin=
k it needs to be given a higher priority (the draft has expired BTW).

It could also do to have some examples. I am finding the draft very opaque =
without.

http://tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01


--
Website: http://hallambaker.com/

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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue vli=
nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'f=
ont-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hello,<o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;fon=
t-family:"Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></span></p>=
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";color:#1F497D'>I should have a new version of the draft out so=
on, hopefully before the next meeting.&nbsp; My working version has incorpo=
rated most of the adjustments requested by the sponsoring AD and the docume=
nt shepherd.&nbsp; I am just waiting on some language on transferring chang=
e control to ensure this is done properly.&nbsp; We will get this version t=
ransferred and then updates can be made in a new document to revise as need=
ed.<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0=
pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Cal=
ibri","sans-serif";color:#1F497D'>It does have a high priority, but we need=
 to do this correctly so that there are no issues with the transfer.&nbsp; =
I chose to let it expire rather than provide an update without the right la=
nguage in the document for the transfer, since this would happen soon.<o:p>=
</o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-=
family:"Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p=
 class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri","s=
ans-serif";color:#1F497D'>Thank you,<o:p></o:p></span></p><p class=3DMsoNor=
mal><span style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";colo=
r:#1F497D'>Kathleen<o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p=
>&nbsp;</o:p></span></p><p class=3DMsoNormal><b><span style=3D'font-size:10=
.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style=3D'font=
-size:10.0pt;font-family:"Tahoma","sans-serif"'> perpass-bounces@ietf.org [=
mailto:perpass-bounces@ietf.org] <b>On Behalf Of </b>Phillip Hallam-Baker<b=
r><b>Sent:</b> Thursday, October 10, 2013 5:20 PM<br><b>To:</b> perpass<br>=
<b>Subject:</b> [perpass] PKCS#12 needs fix'n<o:p></o:p></span></p><p class=
=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>Looking at=
 some comments from Peter Guttman from way back he reports having a large c=
ollection of PKCS#12 files with private keys and no password.&nbsp;<o:p></o=
:p></p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p c=
lass=3DMsoNormal>Ooops<o:p></o:p></p></div><div><p class=3DMsoNormal><o:p>&=
nbsp;</o:p></p></div><div><p class=3DMsoNormal>So I am wondering if this mi=
ght be one of the holes being exploited? It would be consistent with a lot =
of what we have heard.<o:p></o:p></p></div><div><p class=3DMsoNormal><o:p>&=
nbsp;</o:p></p></div><div><p class=3DMsoNormal>There seem to be several iss=
ues<o:p></o:p></p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></di=
v><div><p class=3DMsoNormal>1) Chronic usability issues on Windows re PFX P=
KCS#12 which leads users to export without a password<o:p></o:p></p></div><=
div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNorm=
al>2) Weak cipher suites. The strongest seems to be 3DES, I suspect the def=
ault is RC4 which is one of the ciphers I trust least right now.<o:p></o:p>=
</p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p clas=
s=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>The ciph=
ersuites issue seems to be a real problem. PKCS#12 does not use standard id=
entifiers so a new one has to be cut each time and because it is a low prio=
rity it tends to lag. It is also unnecessarily captive to the legacy base.<=
o:p></o:p></p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><d=
iv><p class=3DMsoNormal>There is a draft to update PKCS#12 and to put it un=
der IETF control. I think it needs to be given a higher priority (the draft=
 has expired BTW).<o:p></o:p></p></div><div><p class=3DMsoNormal><o:p>&nbsp=
;</o:p></p></div><div><p class=3DMsoNormal>It could also do to have some ex=
amples. I am finding the draft very opaque without.<o:p></o:p></p></div><di=
v><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal=
><a href=3D"http://tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01">http:/=
/tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01</a><o:p></o:p></p></div><=
div><p class=3DMsoNormal><br clear=3Dall><o:p></o:p></p><div><p class=3DMso=
Normal><o:p>&nbsp;</o:p></p></div><p class=3DMsoNormal>-- <br>Website: <a h=
ref=3D"http://hallambaker.com/">http://hallambaker.com/</a><o:p></o:p></p><=
/div></div></div></body></html>=

--_000_F5063677821E3B4F81ACFB7905573F24049E8BC61FMX15Acorpemcc_--

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From: Russ Housley <housley@vigilsec.com>
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Subject: Re: [perpass] PKCS#12 needs fix'n
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Kathleen:

Thanks for working to transfer change control to the IETF.  Once this =
happens, the community can work to resolve any shortcomings in the =
specification in an open and transparent manner.

Once the specification is done, hopefully all of the implementers will =
quickly incorporate the improvements.

Russ


On Oct 10, 2013, at 5:27 PM, Moriarty, Kathleen wrote:

> Hello,
> =20
> I should have a new version of the draft out soon, hopefully before =
the next meeting.  My working version has incorporated most of the =
adjustments requested by the sponsoring AD and the document shepherd.  I =
am just waiting on some language on transferring change control to =
ensure this is done properly.  We will get this version transferred and =
then updates can be made in a new document to revise as needed.
> =20
> It does have a high priority, but we need to do this correctly so that =
there are no issues with the transfer.  I chose to let it expire rather =
than provide an update without the right language in the document for =
the transfer, since this would happen soon.
> =20
> Thank you,
> Kathleen
> =20
> From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On =
Behalf Of Phillip Hallam-Baker
> Sent: Thursday, October 10, 2013 5:20 PM
> To: perpass
> Subject: [perpass] PKCS#12 needs fix'n
> =20
> Looking at some comments from Peter Guttman from way back he reports =
having a large collection of PKCS#12 files with private keys and no =
password.=20
> =20
> Ooops
> =20
> So I am wondering if this might be one of the holes being exploited? =
It would be consistent with a lot of what we have heard.
> =20
> There seem to be several issues
> =20
> 1) Chronic usability issues on Windows re PFX PKCS#12 which leads =
users to export without a password
> =20
> 2) Weak cipher suites. The strongest seems to be 3DES, I suspect the =
default is RC4 which is one of the ciphers I trust least right now.
> =20
> =20
> The ciphersuites issue seems to be a real problem. PKCS#12 does not =
use standard identifiers so a new one has to be cut each time and =
because it is a low priority it tends to lag. It is also unnecessarily =
captive to the legacy base.
> =20
> There is a draft to update PKCS#12 and to put it under IETF control. I =
think it needs to be given a higher priority (the draft has expired =
BTW).
> =20
> It could also do to have some examples. I am finding the draft very =
opaque without.
> =20
> http://tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01
>=20
> =20
> --=20
> Website: http://hallambaker.com/
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


--Apple-Mail-126--592817620
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<html><head></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
">Kathleen:<div><br></div><div>Thanks for working to transfer change =
control to the IETF. &nbsp;Once this happens, the community can work to =
resolve any shortcomings in the specification in an open and transparent =
manner.</div><div><br></div><div>Once the specification is done, =
hopefully all of the implementers will quickly incorporate the =
improvements.</div><div><br></div><div>Russ</div><div><br></div><div><br><=
div><div>On Oct 10, 2013, at 5:27 PM, Moriarty, Kathleen wrote:</div><br =
class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><span =
class=3D"Apple-style-span" style=3D"border-collapse: separate; =
font-family: Helvetica; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: =
none; white-space: normal; widows: 2; word-spacing: 0px; =
-webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: =
0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div =
lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"WordSection1" =
style=3D"page: WordSection1; "><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
">Hello,<o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
"><o:p>&nbsp;</o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">I =
should have a new version of the draft out soon, hopefully before the =
next meeting.&nbsp; My working version has incorporated most of the =
adjustments requested by the sponsoring AD and the document =
shepherd.&nbsp; I am just waiting on some language on transferring =
change control to ensure this is done properly.&nbsp; We will get this =
version transferred and then updates can be made in a new document to =
revise as needed.<o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
"><o:p>&nbsp;</o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">It =
does have a high priority, but we need to do this correctly so that =
there are no issues with the transfer.&nbsp; I chose to let it expire =
rather than provide an update without the right language in the document =
for the transfer, since this would happen =
soon.<o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
"><o:p>&nbsp;</o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Thank =
you,<o:p></o:p></span></div><div style=3D"margin-top: 0in; margin-right: =
0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; "><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
">Kathleen<o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
"><o:p>&nbsp;</o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><b><span =
style=3D"font-size: 10pt; font-family: Tahoma, sans-serif; =
">From:</span></b><span style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif; "><span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:perpass-bounces@ietf.org" style=3D"color: blue; =
text-decoration: underline; ">perpass-bounces@ietf.org</a><span =
class=3D"Apple-converted-space">&nbsp;</span>[mailto:perpass-bounces@ietf.=
org]<span class=3D"Apple-converted-space">&nbsp;</span><b>On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>Phillip =
Hallam-Baker<br><b>Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thursday, October 10, 2013 =
5:20 PM<br><b>To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>perpass<br><b>Subject:</b><sp=
an class=3D"Apple-converted-space">&nbsp;</span>[perpass] PKCS#12 needs =
fix'n<o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div><div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; ">Looking at some comments =
from Peter Guttman from way back he reports having a large collection of =
PKCS#12 files with private keys and no =
password.&nbsp;<o:p></o:p></div></div><div><div style=3D"margin-top: =
0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
">Ooops<o:p></o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; ">So I am wondering if this =
might be one of the holes being exploited? It would be consistent with a =
lot of what we have heard.<o:p></o:p></div></div><div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; "><o:p>&nbsp;</o:p></div></div><div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; ">There seem to be several =
issues<o:p></o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; ">1) Chronic usability =
issues on Windows re PFX PKCS#12 which leads users to export without a =
password<o:p></o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; ">2) Weak cipher suites. =
The strongest seems to be 3DES, I suspect the default is RC4 which is =
one of the ciphers I trust least right =
now.<o:p></o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; ">The ciphersuites issue =
seems to be a real problem. PKCS#12 does not use standard identifiers so =
a new one has to be cut each time and because it is a low priority it =
tends to lag. It is also unnecessarily captive to the legacy =
base.<o:p></o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; ">There is a draft to =
update PKCS#12 and to put it under IETF control. I think it needs to be =
given a higher priority (the draft has expired =
BTW).<o:p></o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; ">It could also do to have =
some examples. I am finding the draft very opaque =
without.<o:p></o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><a =
href=3D"http://tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01" =
style=3D"color: blue; text-decoration: underline; =
">http://tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01</a><o:p></o:p></=
div></div><div><div style=3D"margin-top: 0in; margin-right: 0in; =
margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: =
'Times New Roman', serif; "><br clear=3D"all"><o:p></o:p></div><div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; "><o:p>&nbsp;</o:p></div></div><div style=3D"margin-top: =
0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; ">--<span =
class=3D"Apple-converted-space">&nbsp;</span><br>Website:<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"http://hallambaker.com/" style=3D"color: blue; text-decoration: =
underline; =
">http://hallambaker.com/</a><o:p></o:p></div></div></div></div>__________=
_____________________________________<br>perpass mailing list<br><a =
href=3D"mailto:perpass@ietf.org" style=3D"color: blue; text-decoration: =
underline; ">perpass@ietf.org</a><br><a =
href=3D"https://www.ietf.org/mailman/listinfo/perpass" style=3D"color: =
blue; text-decoration: underline; =
">https://www.ietf.org/mailman/listinfo/perpass</a><br></div></span></bloc=
kquote></div><br></div></body></html>=

--Apple-Mail-126--592817620--

From kent@bbn.com  Thu Oct 10 14:57:37 2013
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hay,

> Hiya,
>>> I...
> I disagree. IMO all the snowdonia stuff is very good evidence that
> we need to do better. And "enforcer" is not at issue.
Can yo be more specific here? I have not examined all of what is being made
public; I do have a day job :-) .
> And the 2nd. But the 2nd is a case where there's a teeny bit of
> crypto baked into websockets so that websockets just doesn't
> work without it. But not one to rathole on.
OK, moving on.
> ...
> Going back to a mail from Yoav a few weeks ago - we're not trying to
> prevent state surveillance, but we would like to make it more
> expensive so Yoav isn't on the list of folks that they can afford
> to surveil. Assuming we share that description as a goal, (do we?)
> what other kind of folks do you think we might need to make progress
> on that?
I understand the goal of making life harder for state surveillance.
However, I am not willing (personally) to incur any degraded user 
experience,
premature cell phone battery depletion, etc in order to support this goal.
I suspect, but cannot prove, that most users would express similar feelings.

But, if there are things we can do that are "free" of adverse impacts,
and supportive of the goal you noted, we should consider them.
> There is a fair point there but dealing with what people do on FB
> is not really within the IETF's scope I think. Making it harder for
> a few hacked nodes to record everything everyone does is though.
> (And if we can do that well, I suspect we'll get a bunch of other
> security benefits too.)
I use Gmail for some traffic. If I really cared about the confidentiality
of that traffic, I should choose another provider. How many million
folks make the same decision?

I use the weather channel to check forecasts for my home area, and
for airports en route to destinations, and for vacation and work
trips. I see ads popping up that are a obvious, direct result of
the WC folks having access to cookies from my browser! Somehow
I learned to live with that ;-) .
> And there's also the user-consent issue - regardless of what one
> thinks about web site T&C, it is absolutely the case that users
> have not given permission for the pervasive monitoring that's
> been reported.
Agreed.

Steve

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To: Richard Shockey <richard@shockey.us>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On 10 October 2013 16:11, Richard Shockey <richard@shockey.us> wrote:
> The point we clearly agree on is that a productive discussion on this
> subject would be the usability and deployability of security protocols. I
> there has been a failure it lies there.
>
> I totally agree the concepts of risk management and ultimately reputation
> management are central to mitigating the problems we now see.

+1.

From rlb@ipv.sx  Fri Oct 11 07:56:49 2013
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From: Richard Barnes <rlb@ipv.sx>
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Cc: perpass <perpass@ietf.org>, "Moriarty, Kathleen" <kathleen.moriarty@emc.com>
Subject: Re: [perpass] PKCS#12 needs fix'n
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--e89a8fb1fbfe7f08d504e87852e2
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I would note that the JSON Web Key [1] spec from the JOSE WG provides a
similar, much simpler format than PKCS#12.  Just have JWK Set with one
public, unencrypted member, and one encrypted member:

[
  { "kty": "RSA", "n": "...", "e": "...", "x5c": "..." },
  JWE({ "kty": "RSA", "n": "...", "e": "...", "d": "..." })
]

Since software is going to have to change in any case to use a revised
PKCS#12, I wonder if it might not be a better idea to ditch ASN.1 while
we're at it.

--Richard


On Thu, Oct 10, 2013 at 5:41 PM, Russ Housley <housley@vigilsec.com> wrote:

> Kathleen:
>
> Thanks for working to transfer change control to the IETF.  Once this
> happens, the community can work to resolve any shortcomings in the
> specification in an open and transparent manner.
>
> Once the specification is done, hopefully all of the implementers will
> quickly incorporate the improvements.
>
> Russ
>
>
> On Oct 10, 2013, at 5:27 PM, Moriarty, Kathleen wrote:
>
> Hello,****
> ** **
> I should have a new version of the draft out soon, hopefully before the
> next meeting.  My working version has incorporated most of the adjustments
> requested by the sponsoring AD and the document shepherd.  I am just
> waiting on some language on transferring change control to ensure this is
> done properly.  We will get this version transferred and then updates can
> be made in a new document to revise as needed.****
> ** **
> It does have a high priority, but we need to do this correctly so that
> there are no issues with the transfer.  I chose to let it expire rather
> than provide an update without the right language in the document for the
> transfer, since this would happen soon.****
> ** **
> Thank you,****
> Kathleen****
> ** **
> *From:* perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] *On
> Behalf Of *Phillip Hallam-Baker
> *Sent:* Thursday, October 10, 2013 5:20 PM
> *To:* perpass
> *Subject:* [perpass] PKCS#12 needs fix'n****
> ** **
> Looking at some comments from Peter Guttman from way back he reports
> having a large collection of PKCS#12 files with private keys and no
> password. ****
> ** **
> Ooops****
> ** **
> So I am wondering if this might be one of the holes being exploited? It
> would be consistent with a lot of what we have heard.****
> ** **
> There seem to be several issues****
> ** **
> 1) Chronic usability issues on Windows re PFX PKCS#12 which leads users to
> export without a password****
> ** **
> 2) Weak cipher suites. The strongest seems to be 3DES, I suspect the
> default is RC4 which is one of the ciphers I trust least right now.****
> ** **
> ** **
> The ciphersuites issue seems to be a real problem. PKCS#12 does not use
> standard identifiers so a new one has to be cut each time and because it is
> a low priority it tends to lag. It is also unnecessarily captive to the
> legacy base.****
> ** **
> There is a draft to update PKCS#12 and to put it under IETF control. I
> think it needs to be given a higher priority (the draft has expired BTW).*
> ***
> ** **
> It could also do to have some examples. I am finding the draft very opaque
> without.****
> ** **
> http://tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01****
>
> ****
> ** **
> --
> Website: http://hallambaker.com/****
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>
>
>
> _______________________________________________
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> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>
>

--e89a8fb1fbfe7f08d504e87852e2
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">I would note that the JSON Web Key [1] spec from the JOSE =
WG provides a similar, much simpler format than PKCS#12. =A0Just have JWK S=
et with one public, unencrypted member, and one encrypted member:<div><br><=
/div>
<div>[</div><div>=A0 { &quot;kty&quot;: &quot;RSA&quot;, &quot;n&quot;: &qu=
ot;...&quot;, &quot;e&quot;: &quot;...&quot;, &quot;x5c&quot;: &quot;...&qu=
ot; },</div><div>=A0 JWE({ &quot;kty&quot;: &quot;RSA&quot;, &quot;n&quot;:=
 &quot;...&quot;, &quot;e&quot;: &quot;...&quot;, &quot;d&quot;: &quot;...&=
quot; })</div>
<div>]</div><div><br></div><div>Since software is going to have to change i=
n any case to use a revised PKCS#12, I wonder if it might not be a better i=
dea to ditch ASN.1 while we&#39;re at it.</div><div><br></div><div>--Richar=
d</div>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Thu,=
 Oct 10, 2013 at 5:41 PM, Russ Housley <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:housley@vigilsec.com" target=3D"_blank">housley@vigilsec.com</a>&gt;</s=
pan> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div style=3D"word-wrap:break-word">Kathleen=
:<div><br></div><div>Thanks for working to transfer change control to the I=
ETF. =A0Once this happens, the community can work to resolve any shortcomin=
gs in the specification in an open and transparent manner.</div>
<div><br></div><div>Once the specification is done, hopefully all of the im=
plementers will quickly incorporate the improvements.</div><div><br></div><=
div>Russ</div><div><br></div><div><br><div><div><div class=3D"h5"><div>On O=
ct 10, 2013, at 5:27 PM, Moriarty, Kathleen wrote:</div>
<br></div></div><blockquote type=3D"cite"><span style=3D"border-collapse:se=
parate;font-family:Helvetica;font-style:normal;font-variant:normal;font-wei=
ght:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto=
;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;fo=
nt-size:medium"><div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div><div class=3D"h5"><div><div style=3D"margin-top:0in;margin-right:0in;m=
argin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-family:&#39;Times=
 New Roman&#39;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Hello,<u></u><u></u></span></div>
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)"><u></u>=A0<u></u></span></div>
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)">I should have a new version of the draft out soon, hopefully before the =
next meeting.=A0 My working version has incorporated most of the adjustment=
s requested by the sponsoring AD and the document shepherd.=A0 I am just wa=
iting on some language on transferring change control to ensure this is don=
e properly.=A0 We will get this version transferred and then updates can be=
 made in a new document to revise as needed.<u></u><u></u></span></div>
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)"><u></u>=A0<u></u></span></div>
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)">It does have a high priority, but we need to do this correctly so that t=
here are no issues with the transfer.=A0 I chose to let it expire rather th=
an provide an update without the right language in the document for the tra=
nsfer, since this would happen soon.<u></u><u></u></span></div>
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)"><u></u>=A0<u></u></span></div>
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)">Thank you,<u></u><u></u></span></div>
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)">Kathleen<u></u><u></u></span></div>
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)"><u></u>=A0<u></u></span></div>
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"><b><s=
pan style=3D"font-size:10pt;font-family:Tahoma,sans-serif">From:</span></b>=
<span style=3D"font-size:10pt;font-family:Tahoma,sans-serif"><span>=A0</spa=
n><a href=3D"mailto:perpass-bounces@ietf.org" style=3D"color:blue;text-deco=
ration:underline" target=3D"_blank">perpass-bounces@ietf.org</a><span>=A0</=
span>[mailto:<a href=3D"mailto:perpass-bounces@ietf.org" target=3D"_blank">=
perpass-bounces@ietf.org</a>]<span>=A0</span><b>On Behalf Of<span>=A0</span=
></b>Phillip Hallam-Baker<br>
<b>Sent:</b><span>=A0</span>Thursday, October 10, 2013 5:20 PM<br><b>To:</b=
><span>=A0</span>perpass<br><b>Subject:</b><span>=A0</span>[perpass] PKCS#1=
2 needs fix&#39;n<u></u><u></u></span></div><div style=3D"margin-top:0in;ma=
rgin-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-f=
amily:&#39;Times New Roman&#39;,serif">
<u></u>=A0<u></u></div><div><div><div style=3D"margin-top:0in;margin-right:=
0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-family:&#39;=
Times New Roman&#39;,serif">Looking at some comments from Peter Guttman fro=
m way back he reports having a large collection of PKCS#12 files with priva=
te keys and no password.=A0<u></u><u></u></div>
</div><div><div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;ma=
rgin-bottom:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,s=
erif"><u></u>=A0<u></u></div></div><div><div style=3D"margin-top:0in;margin=
-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-famil=
y:&#39;Times New Roman&#39;,serif">
Ooops<u></u><u></u></div></div><div><div style=3D"margin-top:0in;margin-rig=
ht:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-family:&#=
39;Times New Roman&#39;,serif"><u></u>=A0<u></u></div></div><div><div style=
=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom:0.0001pt;=
font-size:12pt;font-family:&#39;Times New Roman&#39;,serif">
So I am wondering if this might be one of the holes being exploited? It wou=
ld be consistent with a lot of what we have heard.<u></u><u></u></div></div=
><div><div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-=
bottom:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif"=
>
<u></u>=A0<u></u></div></div><div><div style=3D"margin-top:0in;margin-right=
:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-family:&#39=
;Times New Roman&#39;,serif">There seem to be several issues<u></u><u></u><=
/div>
</div><div><div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;ma=
rgin-bottom:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,s=
erif"><u></u>=A0<u></u></div></div><div><div style=3D"margin-top:0in;margin=
-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-famil=
y:&#39;Times New Roman&#39;,serif">
1) Chronic usability issues on Windows re PFX PKCS#12 which leads users to =
export without a password<u></u><u></u></div></div><div><div style=3D"margi=
n-top:0in;margin-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size=
:12pt;font-family:&#39;Times New Roman&#39;,serif">
<u></u>=A0<u></u></div></div><div><div style=3D"margin-top:0in;margin-right=
:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-family:&#39=
;Times New Roman&#39;,serif">2) Weak cipher suites. The strongest seems to =
be 3DES, I suspect the default is RC4 which is one of the ciphers I trust l=
east right now.<u></u><u></u></div>
</div><div><div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;ma=
rgin-bottom:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,s=
erif"><u></u>=A0<u></u></div></div><div><div style=3D"margin-top:0in;margin=
-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-famil=
y:&#39;Times New Roman&#39;,serif">
<u></u>=A0<u></u></div></div><div><div style=3D"margin-top:0in;margin-right=
:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-family:&#39=
;Times New Roman&#39;,serif">The ciphersuites issue seems to be a real prob=
lem. PKCS#12 does not use standard identifiers so a new one has to be cut e=
ach time and because it is a low priority it tends to lag. It is also unnec=
essarily captive to the legacy base.<u></u><u></u></div>
</div><div><div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;ma=
rgin-bottom:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,s=
erif"><u></u>=A0<u></u></div></div><div><div style=3D"margin-top:0in;margin=
-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-famil=
y:&#39;Times New Roman&#39;,serif">
There is a draft to update PKCS#12 and to put it under IETF control. I thin=
k it needs to be given a higher priority (the draft has expired BTW).<u></u=
><u></u></div></div><div><div style=3D"margin-top:0in;margin-right:0in;marg=
in-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-family:&#39;Times Ne=
w Roman&#39;,serif">
<u></u>=A0<u></u></div></div><div><div style=3D"margin-top:0in;margin-right=
:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-family:&#39=
;Times New Roman&#39;,serif">It could also do to have some examples. I am f=
inding the draft very opaque without.<u></u><u></u></div>
</div><div><div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;ma=
rgin-bottom:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,s=
erif"><u></u>=A0<u></u></div></div><div><div style=3D"margin-top:0in;margin=
-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-famil=
y:&#39;Times New Roman&#39;,serif">
<a href=3D"http://tools.ietf.org/html/draft-moriarty-pkcs12v1-1-01" style=
=3D"color:blue;text-decoration:underline" target=3D"_blank">http://tools.ie=
tf.org/html/draft-moriarty-pkcs12v1-1-01</a><u></u><u></u></div></div><div>=
<div style=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom=
:0.0001pt;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif">
<br clear=3D"all"><u></u><u></u></div><div><div style=3D"margin-top:0in;mar=
gin-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:12pt;font-fa=
mily:&#39;Times New Roman&#39;,serif"><u></u>=A0<u></u></div></div><div sty=
le=3D"margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom:0.0001p=
t;font-size:12pt;font-family:&#39;Times New Roman&#39;,serif">
--<span>=A0</span><br>Website:<span>=A0</span><a href=3D"http://hallambaker=
.com/" style=3D"color:blue;text-decoration:underline" target=3D"_blank">htt=
p://hallambaker.com/</a><u></u><u></u></div></div></div></div></div></div>_=
______________________________________________<br>
perpass mailing list<br><a href=3D"mailto:perpass@ietf.org" style=3D"color:=
blue;text-decoration:underline" target=3D"_blank">perpass@ietf.org</a><br><=
a href=3D"https://www.ietf.org/mailman/listinfo/perpass" style=3D"color:blu=
e;text-decoration:underline" target=3D"_blank">https://www.ietf.org/mailman=
/listinfo/perpass</a><br>
</div></span></blockquote></div><br></div></div><br>_______________________=
________________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/perpass</a><br>
<br></blockquote></div><br></div>

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Date: Fri, 11 Oct 2013 14:26:50 -0400
From: Carl Wallace <carl@redhoundsoftware.com>
To: Richard Barnes <rlb@ipv.sx>
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Thread-Topic: [perpass] PKCS#12 needs fix'n
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From:  Richard Barnes <rlb@ipv.sx>
Date:  Friday, October 11, 2013 10:56 AM
To:  Russ Housley <housley@vigilsec.com>
Cc:  perpass <perpass@ietf.org>, "Moriarty, Kathleen"
<kathleen.moriarty@emc.com>
Subject:  Re: [perpass] PKCS#12 needs fix'n

> I would note that the JSON Web Key [1] spec from the JOSE WG provides a
> similar, much simpler format than PKCS#12.  Just have JWK Set with one public,
> unencrypted member, and one encrypted member:
> 
> [
>   { "kty": "RSA", "n": "...", "e": "...", "x5c": "..." },
>   JWE({ "kty": "RSA", "n": "...", "e": "...", "d": "..." })
> ]
> 
> Since software is going to have to change in any case to use a revised
> PKCS#12, I wonder if it might not be a better idea to ditch ASN.1 while we're
> at it.

I think I see some ASN.1 in your JSON too:-)



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<html><head></head><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: s=
pace; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size:=
 14px; font-family: Calibri, sans-serif; "><div><br></div><span id=3D"OLK_SRC_=
BODY_SECTION"><div style=3D"font-family:Calibri; font-size:11pt; text-align:le=
ft; color:black; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDI=
NG-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1=
pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt"><span style=3D"font-wei=
ght:bold">From: </span> Richard Barnes &lt;<a href=3D"mailto:rlb@ipv.sx">rlb@i=
pv.sx</a>&gt;<br><span style=3D"font-weight:bold">Date: </span> Friday, Octobe=
r 11, 2013 10:56 AM<br><span style=3D"font-weight:bold">To: </span> Russ Housl=
ey &lt;<a href=3D"mailto:housley@vigilsec.com">housley@vigilsec.com</a>&gt;<br=
><span style=3D"font-weight:bold">Cc: </span> perpass &lt;<a href=3D"mailto:perp=
ass@ietf.org">perpass@ietf.org</a>&gt;, "Moriarty, Kathleen" &lt;<a href=3D"ma=
ilto:kathleen.moriarty@emc.com">kathleen.moriarty@emc.com</a>&gt;<br><span s=
tyle=3D"font-weight:bold">Subject: </span> Re: [perpass] PKCS#12 needs fix'n<b=
r></div><div><br></div><blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" s=
tyle=3D"BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;"><div d=
ir=3D"ltr">I would note that the JSON Web Key [1] spec from the JOSE WG provid=
es a similar, much simpler format than PKCS#12. &nbsp;Just have JWK Set with=
 one public, unencrypted member, and one encrypted member:<div><br></div><di=
v>[</div><div>&nbsp; { "kty": "RSA", "n": "...", "e": "...", "x5c": "..." },=
</div><div>&nbsp; JWE({ "kty": "RSA", "n": "...", "e": "...", "d": "..." })<=
/div><div>]</div><div><br></div><div>Since software is going to have to chan=
ge in any case to use a revised PKCS#12, I wonder if it might not be a bette=
r idea to ditch ASN.1 while we're at it.</div></div></blockquote></span><div=
><br></div><div>I think I see some ASN.1 in your JSON too:-)</div></body></h=
tml>

--B_3464346414_30499081--



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Subject: Re: [perpass] PKCS#12 needs fix'n
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On Fri, Oct 11, 2013 at 2:26 PM, Carl Wallace <carl@redhoundsoftware.com>wrote:

>
> From: Richard Barnes <rlb@ipv.sx>
> Date: Friday, October 11, 2013 10:56 AM
> To: Russ Housley <housley@vigilsec.com>
> Cc: perpass <perpass@ietf.org>, "Moriarty, Kathleen" <
> kathleen.moriarty@emc.com>
> Subject: Re: [perpass] PKCS#12 needs fix'n
>
> I would note that the JSON Web Key [1] spec from the JOSE WG provides a
> similar, much simpler format than PKCS#12.  Just have JWK Set with one
> public, unencrypted member, and one encrypted member:
>
> [
>   { "kty": "RSA", "n": "...", "e": "...", "x5c": "..." },
>   JWE({ "kty": "RSA", "n": "...", "e": "...", "d": "..." })
> ]
>
> Since software is going to have to change in any case to use a revised
> PKCS#12, I wonder if it might not be a better idea to ditch ASN.1 while
> we're at it.
>
>
> I think I see some ASN.1 in your JSON too:-)
>

X.509 is one thing.  PKCS#12 is quite another.  Having implemented both (in
JavaScript, no less), I can tell you which one caused less pain and got
more interop.

--Richard

--001a1134c4c272f92104e87b5281
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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On F=
ri, Oct 11, 2013 at 2:26 PM, Carl Wallace <span dir=3D"ltr">&lt;<a href=3D"=
mailto:carl@redhoundsoftware.com" target=3D"_blank">carl@redhoundsoftware.c=
om</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div style=3D"font-size:14px;font-family:Cal=
ibri,sans-serif;word-wrap:break-word"><div><br></div><span><div style=3D"bo=
rder-right:medium none;padding-right:0in;padding-left:0in;padding-top:3pt;t=
ext-align:left;font-size:11pt;border-bottom:medium none;font-family:Calibri=
;border-top:#b5c4df 1pt solid;padding-bottom:0in;border-left:medium none">
<span style=3D"font-weight:bold">From: </span> Richard Barnes &lt;<a href=
=3D"mailto:rlb@ipv.sx" target=3D"_blank">rlb@ipv.sx</a>&gt;<br><span style=
=3D"font-weight:bold">Date: </span> Friday, October 11, 2013 10:56 AM<br><s=
pan style=3D"font-weight:bold">To: </span> Russ Housley &lt;<a href=3D"mail=
to:housley@vigilsec.com" target=3D"_blank">housley@vigilsec.com</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span> perpass &lt;<a href=3D"mailto:=
perpass@ietf.org" target=3D"_blank">perpass@ietf.org</a>&gt;, &quot;Moriart=
y, Kathleen&quot; &lt;<a href=3D"mailto:kathleen.moriarty@emc.com" target=
=3D"_blank">kathleen.moriarty@emc.com</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span> Re: [perpass] PKCS#12 nee=
ds fix&#39;n<br></div><div class=3D"im"><div><br></div><blockquote style=3D=
"BORDER-LEFT:#b5c4df 5 solid;PADDING:0 0 0 5;MARGIN:0 0 0 5"><div dir=3D"lt=
r">I would note that the JSON Web Key [1] spec from the JOSE WG provides a =
similar, much simpler format than PKCS#12. =A0Just have JWK Set with one pu=
blic, unencrypted member, and one encrypted member:<div>
<br></div><div>[</div><div>=A0 { &quot;kty&quot;: &quot;RSA&quot;, &quot;n&=
quot;: &quot;...&quot;, &quot;e&quot;: &quot;...&quot;, &quot;x5c&quot;: &q=
uot;...&quot; },</div><div>=A0 JWE({ &quot;kty&quot;: &quot;RSA&quot;, &quo=
t;n&quot;: &quot;...&quot;, &quot;e&quot;: &quot;...&quot;, &quot;d&quot;: =
&quot;...&quot; })</div>
<div>]</div><div><br></div><div>Since software is going to have to change i=
n any case to use a revised PKCS#12, I wonder if it might not be a better i=
dea to ditch ASN.1 while we&#39;re at it.</div></div></blockquote></div>
</span><div><br></div><div>I think I see some ASN.1 in your JSON too:-)</di=
v></div>
</blockquote></div><br></div><div class=3D"gmail_extra">X.509 is one thing.=
 =A0PKCS#12 is quite another. =A0Having implemented both (in JavaScript, no=
 less), I can tell you which one caused less pain and got more interop.</di=
v>
<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">--Richard</=
div></div>

--001a1134c4c272f92104e87b5281--

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Date: Sat, 12 Oct 2013 19:03:44 +0100
From: Leo Vegoda <leo@vegoda.org>
To: Mike Demmers <mdietf@demmers.org>
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References: <20130925110934.464c7592@cicero.demmers.org> <524343B5.8010808@cs.tcd.ie> <20130930135150.23771137@cicero.demmers.org> <nrjb59ha1af4nhnc1to7758iammd4o7dn4@hive.bjoern.hoehrmann.de> <20131010050040.03051a8e@cicero.demmers.org> <j46d59lctinvqcnsan9s7ogu1l3oq10ab9@hive.bjoern.hoehrmann.de> <20131010092504.039f1217@cicero.demmers.org>
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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On Thu, Oct 10, 2013 at 09:25:04AM -0700, Mike Demmers wrote:

[...]

> How about this:
> 
> There are two new standard buttons on the MUA: FRIEND UNFRIEND
> 
> Everything possible is set up by the MUA when it is first run - keys, made, if they do not exist, questions asked and answered about keyservers, pass phrases, various preferences etc. Same as it SHOULD be now.
> 
> "Coolmail has a new feature! You can 'Friend' people, and if they also friend you, you will be communicating privately from then on. Better yet, you will see no spam in this mode (unless you friend a spammer).
> 
> It's easy to use! When someone you wish to communicate with privately emails you, just hit the friend button. This will handle everything automatically. They will be sent a plain text message with your special key. And if they also friend you, their special key will be sent to you, if you do not already have it. (all automatic). 
> 
> You can also set up this feature to automatically check the keyserver of your choice in preferences/friending" blah blah blah..."
> 
> Something like that. Does not seem hard to me. Probably a bit less hard than learning how to add an attachment to an email, most everyone learns to do that.
> 
> You just have to hit one button, all else is handled automatically. 

How is key management handled? Managing scheduled key rollovers
might be easy enough but what about unscheduled key rollovers when
a system is compromised and the old keypair needs to be revoked and
a new keypair needs to be created and publishedr?

Making good key management lightweight strÑ–kes me as a hard problem.
Is that wrong?

Regards,

Leo

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On Sat, 12 Oct 2013 19:03:44 +0100
Leo Vegoda <leo@vegoda.org> wrote:

> How is key management handled?

Ok, first I want to summarize again, incorporating the changes made after B=
joern's commants.

We are now looking at a two level key exchange, one with a 'public' public =
key, and a second with a 'private' public key. And I am trying to keep this=
 just two buttons, 'Friend' and 'Unfriend' to make it as simple as possible.

This is for the case where the MUA is 'default deny' aware. (If not availab=
le yet, this would be trivial to do with a small helper program or plugin, =
since SMTP is such a simple protocol).

I am using 'sender' as the person who wants to initiate this, who could be =
unknown to the 'recipient'.

Note that some state during the 'friend' process has to be kept by both sid=
es, somehow. Not hard.

Somewhere in the email program's setup prefs are two options:

/X/ Use Private public keys for friends (use the two level keys). ON by def=
ault.

/_/ Use Individual Super Private Keys for friends. (off by default...maybe)=
. This forces a new, individual  'private' public key (keypair, actually) t=
o be created for EACH friend. This provides some additional protection in c=
ase senders machine is compromised - only THAT private public key will be c=
ompromised.

OK, I am the sender, and I want to send to someone who may or may not know =
me.

1. I hit the friend button. I may have an email message from the person, or=
 maybe not. The MUA creates a blank, unencrypted email for me, getting the =
TO: either from the email I have up in view or prompting me for it. The pro=
gram sees that I do not have a public key for this person and no transactio=
n is already in progress, so it knows this is the initial state. I write th=
e email, and had better be convincing about why I want to be friended if th=
e other person does not know me. Send the email.

Program changes the state of this transaction to a state where it is expect=
ing a public key to be sent back.

Note that no key is sent within this step, and the email must be unencrypte=
d.

2. The recipient gets the email, and now has a choice to friend me or not. =
To friend me, he hits the friend button. Note that the onus here is on the =
recipient, this is exactly the opposite of normail email, where anyone can =
spam you and then you have to take positive action (like blocking) to preve=
nt any more mail from that source. Here, if recipient wants no encrypted em=
ail from this source, they just do nothing.

Now his MUA checks state, sees it is time to send his 'public' public key t=
o the sender. It sends his public key, unencrypted.=20

State is changed.

3. Sender gets public public key from recipient, and sends senders public k=
ey back, still unencrypted.

4. Recipient gets 'public' public key from sender. Now we have a way to enc=
rypt mail successfullly on both ends.=20

Recipient encrypts recipients 'private' public key with senders 'public' pu=
blic key and sends it to sender, who will now be able to decode it.

5. Sender decrypts recipients 'private' public key. Sender now encrypts sen=
ders 'private' public key and sends it to recipient, who can now decode it.=
 Sender now switches the 'active' public key from the 'public' public key t=
o the 'private' public key, and notifies the senders MTA to whitelist the r=
ecipient for encrypted email.

6. Recipents gets senders encrypted 'private' public key, decodes it. Recip=
ient now switches the 'active' public key from the 'public' public key to t=
he 'private' public key, and notifies the recipients MTA to whitelist the s=
ender for encrypted email.

Friending completed.

All done with one button press from each side, everything else is automatic.
Only email is used for the whole transactions, no keyservers or other side =
channels needed.
The public keys _actually used_ by both sides have never been sent in the c=
lear.
The private keys have never been sent anywhere either, of course.
Not very fast, be we do not really need fast for something like this that j=
ust happens once.
Spammer can send all the unencryted 'requests' they like, but they can do t=
hat now. Only the recipient can actually initiate the automated stuff, so t=
here is no DOS type leverage from automated emails.

Possible spammer actions:

1. Try to use the 'public' public key and forge senders email address. A po=
intless exercise since recipient will not be able to decode it, they are ex=
pecting encrypted mail to use the 'private' public key.

2. Compromise senders system obtaining the private private key. Always a da=
nger, but spammers depend upon being able to send millions of emails easily=
. Not practical to have to compromise every one of their spam recipients ma=
chines, and how do they know who has friended who? Only a mass surveillance=
 state actor could do this, and whatever you may feel about that, so far th=
ey have not resorted to spamming. ;-)

Both of these attempts would incidentally provide a pretty much 100 percent=
 sure way to filter the emails out as spam. Though, if my friends system wa=
s compromised, and the spammer sent me spam, I would consider that valuable=
 information since it would tell me my friends system and my private public=
 key were compromised.=20

> Managing scheduled key rollovers
> might be easy enough but what about unscheduled key rollovers when
> a system is compromised and the old keypair needs to be revoked and
> a new keypair needs to be created and publishedr?

OK, this is a special case.

If I hold down the shift button in my MUA, the 'friend' button changes to '=
refriend'. This means 'make a new 'private' public key (pair), and do the '=
private' public key exchange again. Of course will want to make sure my fri=
end has cleaned up his system first.

On his end, his private keys are compromised too, so he has to hold doen th=
e shift and control keys to see the friend button change to 'Redo all' or '=
Was Hacked' or something similar.=20

May want to keep the old keys to be able to read old emails, but they will =
no longer be current. Both the 'public' public and private keys will be rem=
ade, and the 'private' public and private keys need to be remade in his cas=
e.

If neither of us was actually compromised, and we just want new keys (new '=
private' public keys) for some reason, we both just hit the 'refriend' butt=
on. All else handled by the MUAs.

Something like that.


> Making good key management lightweight str=D1=96kes me as a hard problem.
> Is that wrong?

You tell me. Will the above work? Seems pretty simple to me. I am not a sec=
urity expert though, just a poor user who wants this to all be MUCH easier =
(for end users, system admin users, and programmers). Where are the flaws?

I think what makes present key management hard in email is the current assu=
mption that 'anyone must be able to email anyone at any time' - default acc=
ept, in other words. To do this you need things like public keyservers, or =
some other way that keys can be easily known.

Default deny for encrypted email removes that problem, since both sides mus=
t already be known to each other.=20

Remember my goals:

Get everyone to use at least some email encryption by making it really simp=
le to use, and having a reason (less spam) more instantly apparent than jus=
t privacy.=20

Perfection not required. I'm sure this could be probably be MITMed but to d=
o that someone has to go to much extra effort. And the thing is, pretty muc=
h everything we are using now has had serious, sometimes 'banging head on d=
esk' 'how could that possibly have been missed' problems at one point or an=
other. Get everyone using this, we can then later come out with version2, w=
hich is MUCH easier to do that just getting everyone on board to start with=
. There would also still be the option of exchanging keys manually. You cou=
ld still perhaps build in some 'web of trust' type checks with keyservers (=
for the 'public' public keys). First you have to get the users hooked. THEN=
 up the ante. ;-)

-Mike

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Date: Sun, 13 Oct 2013 08:25:08 -0700
From: Leo Vegoda <leo@vegoda.org>
To: Mike Demmers <mdietf@demmers.org>
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References: <20130925110934.464c7592@cicero.demmers.org> <524343B5.8010808@cs.tcd.ie> <20130930135150.23771137@cicero.demmers.org> <nrjb59ha1af4nhnc1to7758iammd4o7dn4@hive.bjoern.hoehrmann.de> <20131010050040.03051a8e@cicero.demmers.org> <j46d59lctinvqcnsan9s7ogu1l3oq10ab9@hive.bjoern.hoehrmann.de> <20131010092504.039f1217@cicero.demmers.org> <20131012180344.GA11447@vegoda.org> <20131012234500.2813ff1c@cicero.demmers.org>
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Cc: Perpass List Submit <perpass@ietf.org>
Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On Sat, Oct 12, 2013 at 11:45:00PM -0700, Mike Demmers wrote:
> On Sat, 12 Oct 2013 19:03:44 +0100
> Leo Vegoda <leo@vegoda.org> wrote:
> 
> > How is key management handled?
> 
> Ok, first I want to summarize again, incorporating the changes made after Bjoern's commants.
> 
> We are now looking at a two level key exchange, one with a 'public' public key, and a second with a 'private' public key. And I am trying to keep this just two buttons, 'Friend' and 'Unfriend' to make it as simple as possible.

[...]

> > Making good key management lightweight strikes me as a hard problem.
> > Is that wrong?
> 
> You tell me. Will the above work? Seems pretty simple to me. I am not a security expert though, just a poor user who wants this to all be MUCH easier (for end users, system admin users, and programmers). Where are the flaws?
> 
> I think what makes present key management hard in email is the current assumption that 'anyone must be able to email anyone at any time' - default accept, in other words. To do this you need things like public keyservers, or some other way that keys can be easily known.
> 
> Default deny for encrypted email removes that problem, since both sides must already be known to each other. 
> 
> Remember my goals:
> 
> Get everyone to use at least some email encryption by making it really simple to use, and having a reason (less spam) more instantly apparent than just privacy. 

I am not a security expert either but presumably people will need to
export keys for backup and deployment on other systems. For
instance, many people have something like a laptop computer, a
smartphone and a tablet. Presumably, users would want to use the
same keys on all those devices so that they can read all their
e-mail no matter which device they use.

I also expect people would want to be able to revoke a key if a
device is stolen and then generate a new key to replace it, back
that up and distribute it to all the devices in use.

I think the UI elements for generating and publishing a key are
important but if the underlying key management doesn't meet people's
needs then your goal of getting people to use encryption won't be
achieved because the things they can do today won't be possible.

So my questions are:

- how do people use the same keys on all their devices?
- how do people securely backup their keys?
- how do people revoke keys when a device is stolen or otherwise
  compromised?

Regards,

Leo

From acooper@cdt.org  Sun Oct 13 14:36:05 2013
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Hi Steve,

I'd like to challenge your assertions that because Gmail and Facebook =
have billions of users, the bulk of Internet users do not care about =
pervasive state surveillance of all or most of their of their Internet =
communications, and therefore the IETF's attempts at promoting strong =
security have thus far been sufficient. Privacy is often valued =
contextually. The fact that a user accepts the trade-offs that Gmail =
presents (accepting that a private company will scan her emails in =
exchange for a snappy interface or beneficial network effects) does not =
mean that the same user is comfortable with pervasive government =
surveillance that could allow her to be pursued (using police force) =
under legal standards that are often vague or uncertain for anything she =
writes in every email she sends. The state's ability to impinge on a =
wide range of individual freedoms surpasses by far the ability of any =
single private company to do so. The line between private and public =
sector data collection has obviously blurred as more and more data is =
exchanged between the two, but that does not make the two of them =
equivalent.

For the list: much of this thread's discussion seems to presume that the =
business considerations behind individual companies' decisions about =
whether to deploy secure protocols or not are unchanged from what they =
were four months ago prior to the beginning of the revelations. Yet =
elsewhere there seems to be a whole lot of hand-wringing going on about =
how much business is being lost or how nervous various customers are in =
the wake of the revelations. Can we really assume that no IT managers in =
charge of enterprise SIP deployments or middlebox-based =
backwards-compatability solutions are even considering re-evaluating how =
they balance competing requirements?=20

Alissa

On Oct 10, 2013, at 5:57 PM, Stephen Kent <kent@bbn.com> wrote:

> Hay,
>=20
>> Hiya,
>>>> I...
>> I disagree. IMO all the snowdonia stuff is very good evidence that
>> we need to do better. And "enforcer" is not at issue.
> Can yo be more specific here? I have not examined all of what is being =
made
> public; I do have a day job :-) .
>> And the 2nd. But the 2nd is a case where there's a teeny bit of
>> crypto baked into websockets so that websockets just doesn't
>> work without it. But not one to rathole on.
> OK, moving on.
>> ...
>> Going back to a mail from Yoav a few weeks ago - we're not trying to
>> prevent state surveillance, but we would like to make it more
>> expensive so Yoav isn't on the list of folks that they can afford
>> to surveil. Assuming we share that description as a goal, (do we?)
>> what other kind of folks do you think we might need to make progress
>> on that?
> I understand the goal of making life harder for state surveillance.
> However, I am not willing (personally) to incur any degraded user =
experience,
> premature cell phone battery depletion, etc in order to support this =
goal.
> I suspect, but cannot prove, that most users would express similar =
feelings.
>=20
> But, if there are things we can do that are "free" of adverse impacts,
> and supportive of the goal you noted, we should consider them.
>> There is a fair point there but dealing with what people do on FB
>> is not really within the IETF's scope I think. Making it harder for
>> a few hacked nodes to record everything everyone does is though.
>> (And if we can do that well, I suspect we'll get a bunch of other
>> security benefits too.)
> I use Gmail for some traffic. If I really cared about the =
confidentiality
> of that traffic, I should choose another provider. How many million
> folks make the same decision?
>=20
> I use the weather channel to check forecasts for my home area, and
> for airports en route to destinations, and for vacation and work
> trips. I see ads popping up that are a obvious, direct result of
> the WC folks having access to cookies from my browser! Somehow
> I learned to live with that ;-) .
>> And there's also the user-consent issue - regardless of what one
>> thinks about web site T&C, it is absolutely the case that users
>> have not given permission for the pervasive monitoring that's
>> been reported.
> Agreed.
>=20
> Steve
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>=20


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From rschulman@gmail.com  Mon Oct 14 05:47:02 2013
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Alissa got to writing this email before I did, but I second pretty much
everything she said here. Corporate data collection is not the same as
pervasive government surveillance. Each has their concerns, but they are
separate and the solutions to the two are considerably different.

-Ross


On Sun, Oct 13, 2013 at 5:35 PM, Alissa Cooper <acooper@cdt.org> wrote:

> Hi Steve,
>
> I'd like to challenge your assertions that because Gmail and Facebook have
> billions of users, the bulk of Internet users do not care about pervasive
> state surveillance of all or most of their of their Internet
> communications, and therefore the IETF's attempts at promoting strong
> security have thus far been sufficient. Privacy is often valued
> contextually. The fact that a user accepts the trade-offs that Gmail
> presents (accepting that a private company will scan her emails in exchange
> for a snappy interface or beneficial network effects) does not mean that
> the same user is comfortable with pervasive government surveillance that
> could allow her to be pursued (using police force) under legal standards
> that are often vague or uncertain for anything she writes in every email
> she sends. The state's ability to impinge on a wide range of individual
> freedoms surpasses by far the ability of any single private company to do
> so. The line between private and public sector data collection has
> obviously blurred as more and more data is exchanged between the two, but
> that does not make the two of them equivalent.
>
> For the list: much of this thread's discussion seems to presume that the
> business considerations behind individual companies' decisions about
> whether to deploy secure protocols or not are unchanged from what they were
> four months ago prior to the beginning of the revelations. Yet elsewhere
> there seems to be a whole lot of hand-wringing going on about how much
> business is being lost or how nervous various customers are in the wake of
> the revelations. Can we really assume that no IT managers in charge of
> enterprise SIP deployments or middlebox-based backwards-compatability
> solutions are even considering re-evaluating how they balance competing
> requirements?
>
> Alissa
>
> On Oct 10, 2013, at 5:57 PM, Stephen Kent <kent@bbn.com> wrote:
>
> > Hay,
> >
> >> Hiya,
> >>>> I...
> >> I disagree. IMO all the snowdonia stuff is very good evidence that
> >> we need to do better. And "enforcer" is not at issue.
> > Can yo be more specific here? I have not examined all of what is being
> made
> > public; I do have a day job :-) .
> >> And the 2nd. But the 2nd is a case where there's a teeny bit of
> >> crypto baked into websockets so that websockets just doesn't
> >> work without it. But not one to rathole on.
> > OK, moving on.
> >> ...
> >> Going back to a mail from Yoav a few weeks ago - we're not trying to
> >> prevent state surveillance, but we would like to make it more
> >> expensive so Yoav isn't on the list of folks that they can afford
> >> to surveil. Assuming we share that description as a goal, (do we?)
> >> what other kind of folks do you think we might need to make progress
> >> on that?
> > I understand the goal of making life harder for state surveillance.
> > However, I am not willing (personally) to incur any degraded user
> experience,
> > premature cell phone battery depletion, etc in order to support this
> goal.
> > I suspect, but cannot prove, that most users would express similar
> feelings.
> >
> > But, if there are things we can do that are "free" of adverse impacts,
> > and supportive of the goal you noted, we should consider them.
> >> There is a fair point there but dealing with what people do on FB
> >> is not really within the IETF's scope I think. Making it harder for
> >> a few hacked nodes to record everything everyone does is though.
> >> (And if we can do that well, I suspect we'll get a bunch of other
> >> security benefits too.)
> > I use Gmail for some traffic. If I really cared about the confidentiality
> > of that traffic, I should choose another provider. How many million
> > folks make the same decision?
> >
> > I use the weather channel to check forecasts for my home area, and
> > for airports en route to destinations, and for vacation and work
> > trips. I see ads popping up that are a obvious, direct result of
> > the WC folks having access to cookies from my browser! Somehow
> > I learned to live with that ;-) .
> >> And there's also the user-consent issue - regardless of what one
> >> thinks about web site T&C, it is absolutely the case that users
> >> have not given permission for the pervasive monitoring that's
> >> been reported.
> > Agreed.
> >
> > Steve
> > _______________________________________________
> > perpass mailing list
> > perpass@ietf.org
> > https://www.ietf.org/mailman/listinfo/perpass
> >
>
>
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>
>

--047d7bf0d628ffee0404e8b2dc2e
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Alissa got to writing this email before I did, but I =
second pretty much everything she said here. Corporate data collection is n=
ot the same as pervasive government surveillance. Each has their concerns, =
but they are separate and the solutions to the two are considerably differe=
nt.<br>
<br></div>-Ross<br></div><div class=3D"gmail_extra"><br><br><div class=3D"g=
mail_quote">On Sun, Oct 13, 2013 at 5:35 PM, Alissa Cooper <span dir=3D"ltr=
">&lt;<a href=3D"mailto:acooper@cdt.org" target=3D"_blank">acooper@cdt.org<=
/a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hi Steve,<br>
<br>
I&#39;d like to challenge your assertions that because Gmail and Facebook h=
ave billions of users, the bulk of Internet users do not care about pervasi=
ve state surveillance of all or most of their of their Internet communicati=
ons, and therefore the IETF&#39;s attempts at promoting strong security hav=
e thus far been sufficient. Privacy is often valued contextually. The fact =
that a user accepts the trade-offs that Gmail presents (accepting that a pr=
ivate company will scan her emails in exchange for a snappy interface or be=
neficial network effects) does not mean that the same user is comfortable w=
ith pervasive government surveillance that could allow her to be pursued (u=
sing police force) under legal standards that are often vague or uncertain =
for anything she writes in every email she sends. The state&#39;s ability t=
o impinge on a wide range of individual freedoms surpasses by far the abili=
ty of any single private company to do so. The line between private and pub=
lic sector data collection has obviously blurred as more and more data is e=
xchanged between the two, but that does not make the two of them equivalent=
.<br>

<br>
For the list: much of this thread&#39;s discussion seems to presume that th=
e business considerations behind individual companies&#39; decisions about =
whether to deploy secure protocols or not are unchanged from what they were=
 four months ago prior to the beginning of the revelations. Yet elsewhere t=
here seems to be a whole lot of hand-wringing going on about how much busin=
ess is being lost or how nervous various customers are in the wake of the r=
evelations. Can we really assume that no IT managers in charge of enterpris=
e SIP deployments or middlebox-based backwards-compatability solutions are =
even considering re-evaluating how they balance competing requirements?<br>

<span class=3D"HOEnZb"><font color=3D"#888888"><br>
Alissa<br>
</font></span><div class=3D"HOEnZb"><div class=3D"h5"><br>
On Oct 10, 2013, at 5:57 PM, Stephen Kent &lt;<a href=3D"mailto:kent@bbn.co=
m">kent@bbn.com</a>&gt; wrote:<br>
<br>
&gt; Hay,<br>
&gt;<br>
&gt;&gt; Hiya,<br>
&gt;&gt;&gt;&gt; I...<br>
&gt;&gt; I disagree. IMO all the snowdonia stuff is very good evidence that=
<br>
&gt;&gt; we need to do better. And &quot;enforcer&quot; is not at issue.<br=
>
&gt; Can yo be more specific here? I have not examined all of what is being=
 made<br>
&gt; public; I do have a day job :-) .<br>
&gt;&gt; And the 2nd. But the 2nd is a case where there&#39;s a teeny bit o=
f<br>
&gt;&gt; crypto baked into websockets so that websockets just doesn&#39;t<b=
r>
&gt;&gt; work without it. But not one to rathole on.<br>
&gt; OK, moving on.<br>
&gt;&gt; ...<br>
&gt;&gt; Going back to a mail from Yoav a few weeks ago - we&#39;re not try=
ing to<br>
&gt;&gt; prevent state surveillance, but we would like to make it more<br>
&gt;&gt; expensive so Yoav isn&#39;t on the list of folks that they can aff=
ord<br>
&gt;&gt; to surveil. Assuming we share that description as a goal, (do we?)=
<br>
&gt;&gt; what other kind of folks do you think we might need to make progre=
ss<br>
&gt;&gt; on that?<br>
&gt; I understand the goal of making life harder for state surveillance.<br=
>
&gt; However, I am not willing (personally) to incur any degraded user expe=
rience,<br>
&gt; premature cell phone battery depletion, etc in order to support this g=
oal.<br>
&gt; I suspect, but cannot prove, that most users would express similar fee=
lings.<br>
&gt;<br>
&gt; But, if there are things we can do that are &quot;free&quot; of advers=
e impacts,<br>
&gt; and supportive of the goal you noted, we should consider them.<br>
&gt;&gt; There is a fair point there but dealing with what people do on FB<=
br>
&gt;&gt; is not really within the IETF&#39;s scope I think. Making it harde=
r for<br>
&gt;&gt; a few hacked nodes to record everything everyone does is though.<b=
r>
&gt;&gt; (And if we can do that well, I suspect we&#39;ll get a bunch of ot=
her<br>
&gt;&gt; security benefits too.)<br>
&gt; I use Gmail for some traffic. If I really cared about the confidential=
ity<br>
&gt; of that traffic, I should choose another provider. How many million<br=
>
&gt; folks make the same decision?<br>
&gt;<br>
&gt; I use the weather channel to check forecasts for my home area, and<br>
&gt; for airports en route to destinations, and for vacation and work<br>
&gt; trips. I see ads popping up that are a obvious, direct result of<br>
&gt; the WC folks having access to cookies from my browser! Somehow<br>
&gt; I learned to live with that ;-) .<br>
&gt;&gt; And there&#39;s also the user-consent issue - regardless of what o=
ne<br>
&gt;&gt; thinks about web site T&amp;C, it is absolutely the case that user=
s<br>
&gt;&gt; have not given permission for the pervasive monitoring that&#39;s<=
br>
&gt;&gt; been reported.<br>
&gt; Agreed.<br>
&gt;<br>
&gt; Steve<br>
&gt; _______________________________________________<br>
&gt; perpass mailing list<br>
&gt; <a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_b=
lank">https://www.ietf.org/mailman/listinfo/perpass</a><br>
&gt;<br>
<br>
</div></div><br>_______________________________________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/perpass</a><br>
<br></blockquote></div><br></div>

--047d7bf0d628ffee0404e8b2dc2e--

From rutkowski.tony@gmail.com  Mon Oct 14 05:47:27 2013
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Message-ID: <525BE7DC.4080407@gmail.com>
Date: Mon, 14 Oct 2013 08:47:24 -0400
From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Cc: perpass <perpass@ietf.org>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hi Alissa,

I'd like to challenge your challenge. :-)
The environment here seems much more
complex than you portray.  It is, however,
still all about risk management.

Most users make their choice of provider
and platform based on factors such as:
cost, performance, ease of use, SPAM
and malware reduction, image (i.e.,
account/domain name), mobility,
identity theft mitigation, familiarity,
and social feature sets.  Like credit
card fraud protection, some of those
features require a lot of invasive knowledge.
Fortunately, there are a lot of providers
competing in the marketplace.

A much smaller number of users who
for reason of employment and need to
protect sensitive information, will be
using designated platforms/providers
- frequently implementing their national
government security agency techniques
and practices.

An even smaller set of people who are
engaged in serious criminal and terrorist
activities will employ a variety of security
methods to prevent detection and interception.
Typically, the more dangerous the activity,
the more secure the communications employed.

An even smaller set who are paranoid about
government - which may be context dependent
- will also want to employ a variety of readily
available security methods.

Since the inception of messaging networks,
governments and societies worldwide have
instituted surveillance for all kinds of
essential legitimate purposes - especially
where the potential harm to people is great.
There are few if any exceptions, and some
like Italy purport to be the world's leaders.
Most citizens want that to continue because
the risks of not doing so are great.  What is
perhaps new is the ability for providers
to make use of some of the same technologies
for commercial services of substantial use
by their customers.  Big Data analysis is
growing by leaps and bounds.

So we come full circle back to the subject
of risk management.  You can probably assume
that wherever you are, your message traffic
is being seen by at least a half dozen parties
who are at least extracting meta data along
the way.  In some contexts, it may be more.
Even in 1995, Scott MacNeally urged the
paranoid to "get over it."

So as many have opined, the IETF is a
technical standards body, not an evangelical
organization for socio-political views, and
hopefully will continue to do what it
does well - produce usable protocols - and
leave the implementation choices to others
based on their assessment of the risk.

--tony


On 10/13/2013 5:35 PM, Alissa Cooper wrote:
> Hi Steve,
>
> I'd like to challenge your assertions that because Gmail and Facebook h=
ave billions of users, the bulk of Internet users do not care about perva=
sive state surveillance of all or most of their of their Internet communi=
cations, and therefore the IETF's attempts at promoting strong security h=
ave thus far been sufficient. Privacy is often valued contextually. The f=
act that a user accepts the trade-offs that Gmail presents (accepting tha=
t a private company will scan her emails in exchange for a snappy interfa=
ce or beneficial network effects) does not mean that the same user is com=
fortable with pervasive government surveillance that could allow her to b=
e pursued (using police force) under legal standards that are often vague=
 or uncertain for anything she writes in every email she sends. The state=
's ability to impinge on a wide range of individual freedoms surpasses by=
 far the ability of any single private company to do so. The line between=
 private and public sector data collection has obviously blurred as more =
and more data is exchanged between the two, but that does not make the tw=
o of them equivalent.
>
> For the list: much of this thread's discussion seems to presume that th=
e business considerations behind individual companies' decisions about wh=
ether to deploy secure protocols or not are unchanged from what they were=
 four months ago prior to the beginning of the revelations. Yet elsewhere=
 there seems to be a whole lot of hand-wringing going on about how much b=
usiness is being lost or how nervous various customers are in the wake of=
 the revelations. Can we really assume that no IT managers in charge of e=
nterprise SIP deployments or middlebox-based backwards-compatability solu=
tions are even considering re-evaluating how they balance competing requi=
rements?
>
> Alissa
>
> On Oct 10, 2013, at 5:57 PM, Stephen Kent<kent@bbn.com>  wrote:
>
>> >



From stephen.farrell@cs.tcd.ie  Mon Oct 14 06:00:44 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On 10/14/2013 01:47 PM, Tony Rutkowski wrote:
> Most citizens want that to continue because
> the risks of not doing so are great.

If the "that" above refers to pervasive monitoring,
then please provide evidence (but please do so in
another thread, I bet it'll not be conclusive
enough that one mail will be convincing;-)

If you are referring to tracking or surveillance
of a specific set of targets, then a) that's irrelevant
for this list/discussion which is about pervasive
monitoring, and b) see RFC 2804.

As an aside, its also misleading to speak of citizens
here, since most of us are not citizens of the same
country, for all values of country. So while it is
important and relevant that different jurisdictions
put in place policy/political controls on pervasive
monitoring, those are also not relevant for this
list since in general our protocols can be used
across all possible jurisdictional boundaries.

> So as many have opined, the IETF is a
> technical standards body,

Yes we are. And given that pervasive monitoring is
in some ways indistinguishable from other forms of
attack, we should treat those aspects as an attack
and put in place the best technical mitigations we
can.

And as a reminder the question for this thread,
is whether or not going further than MTI would help
with that.

S.


From rutkowski.tony@gmail.com  Mon Oct 14 06:26:09 2013
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From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hi Steve,

The "that" clearly refers to the precedent sentence:
> Since the inception of messaging networks,
> governments and societies worldwide have
> instituted surveillance for all kinds of
> essential legitimate purposes - especially
> where the potential harm to people is great. 
"Pervasive monitoring" seems an utterly meaningless
term used for political rhetoric/evangelical purposes
that isn't worth pursuing.  That should be a first order
conclusion.

The point was that this is all about risk management.
However, if you or anyone else want to denominate
a religious abstraction as an "attack" - go for it. :-)
It'll be fun to watch.

--tony


On 10/14/2013 9:00 AM, Stephen Farrell wrote:
>
> On 10/14/2013 01:47 PM, Tony Rutkowski wrote:
>> Most citizens want that to continue because
>> the risks of not doing so are great.
> If the "that" above refers to pervasive monitoring,
> then please provide evidence (but please do so in
> another thread, I bet it'll not be conclusive
> enough that one mail will be convincing;-)
>
> If you are referring to tracking or surveillance
> of a specific set of targets, then a) that's irrelevant
> for this list/discussion which is about pervasive
> monitoring, and b) see RFC 2804.
>
> As an aside, its also misleading to speak of citizens
> here, since most of us are not citizens of the same
> country, for all values of country. So while it is
> important and relevant that different jurisdictions
> put in place policy/political controls on pervasive
> monitoring, those are also not relevant for this
> list since in general our protocols can be used
> across all possible jurisdictional boundaries.
>
>> So as many have opined, the IETF is a
>> technical standards body,
> Yes we are. And given that pervasive monitoring is
> in some ways indistinguishable from other forms of
> attack, we should treat those aspects as an attack
> and put in place the best technical mitigations we
> can.
>
> And as a reminder the question for this thread,
> is whether or not going further than MTI would help
> with that.
>
> S.
>


From avri@acm.org  Mon Oct 14 06:43:34 2013
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Hi,

On 14 Oct 2013, at 08:47, Tony Rutkowski wrote:

> So as many have opined, the IETF is a
> technical standards body, not an evangelical
> organization for socio-political views, and
> hopefully will continue to do what it
> does well - produce usable protocols - and
> leave the implementation choices to others
> based on their assessment of the risk.


Yes, but in doing so, it should provide the ability for the individual =
users, whether companies or individuals, to mitigate their risks.  If =
technical standards do not include a mandatory option (MTI) of privacy =
protection they are making a political techno-decsion against privacy.  =
If the Internet cannot be used in a manner that enhances privacy, for =
those who value privacy, but only maximizes surveillance based security =
for those who value surveillance, then it looks to me like we are acting =
evangelically.

We can only maintain the belief that our technology and protocols are =
neutral if they can be used by people of diverse socio-political views.

So while I can see problems with MTU, I think genuine MTI (and perhaps =
some MTU) is needed for privacy enhancements at a level that matches the =
MTIs and MTUs for security.  I technical neutrality requires it.

avri

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From stephen.farrell@cs.tcd.ie  Mon Oct 14 06:44:11 2013
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Hiya,

On 10/14/2013 02:25 PM, Tony Rutkowski wrote:
> Hi Steve,
> 
> The "that" clearly refers to the precedent sentence:
>> Since the inception of messaging networks,
>> governments and societies worldwide have
>> instituted surveillance for all kinds of
>> essential legitimate purposes - especially

"all kinds of essential legitimate purposes" simply
begs the question IMO.

>> where the potential harm to people is great. 
> "Pervasive monitoring" seems an utterly meaningless
> term used for political rhetoric/evangelical purposes
> that isn't worth pursuing.  That should be a first order
> conclusion.

Personally, I entirely disagree. It is true that we
don't have a worked out threat model for this yet,
but Brian's draft is a start on which I hope we'll
build so that protocol designers, implementers and
those deploying networks and services will have a
useful threat model to use when doing their work.

> The point was that this is all about risk management.

That's agreed. One reason for this list is that we have a
new threat model that we've not considered when designing
protocols. The risk analysis has been changed by
recent revelations IMO. If you disagree, that's fine,
but surprising.

> However, if you or anyone else want to denominate
> a religious abstraction as an "attack" - go for it. :-)
> It'll be fun to watch.

I'll take that rhetorical flourish as a lack of
evidence then:-)

And we're going way off topic for this thread, so
please change the subject if you want to continue
on this topic - its not really to do with MTI at
all.

Ta,
S.


> 
> --tony
> 
> 
> On 10/14/2013 9:00 AM, Stephen Farrell wrote:
>>
>> On 10/14/2013 01:47 PM, Tony Rutkowski wrote:
>>> Most citizens want that to continue because
>>> the risks of not doing so are great.
>> If the "that" above refers to pervasive monitoring,
>> then please provide evidence (but please do so in
>> another thread, I bet it'll not be conclusive
>> enough that one mail will be convincing;-)
>>
>> If you are referring to tracking or surveillance
>> of a specific set of targets, then a) that's irrelevant
>> for this list/discussion which is about pervasive
>> monitoring, and b) see RFC 2804.
>>
>> As an aside, its also misleading to speak of citizens
>> here, since most of us are not citizens of the same
>> country, for all values of country. So while it is
>> important and relevant that different jurisdictions
>> put in place policy/political controls on pervasive
>> monitoring, those are also not relevant for this
>> list since in general our protocols can be used
>> across all possible jurisdictional boundaries.
>>
>>> So as many have opined, the IETF is a
>>> technical standards body,
>> Yes we are. And given that pervasive monitoring is
>> in some ways indistinguishable from other forms of
>> attack, we should treat those aspects as an attack
>> and put in place the best technical mitigations we
>> can.
>>
>> And as a reminder the question for this thread,
>> is whether or not going further than MTI would help
>> with that.
>>
>> S.
>>
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

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This is a good discussion.  I do want to add that we should not forget that=
 there are some simple education issues that we have not made enough progre=
ss on yet.  How many of you find yourself explaining to small companies (an=
d even some big ones), that they should not be sending your personal data o=
ver email?  This seems to happen to me and luckily, I was able to head it o=
ff before it happened the last few times.  As we work to bridge gaps, it wi=
ll take time and we may need to figure out education options as we work to =
improve security options.

Bets regards,
Kathleen =20

-----Original Message-----
From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf =
Of Avri Doria
Sent: Monday, October 14, 2013 9:43 AM
To: perpass
Subject: Re: [perpass] mandatory-to-implement vs. more?


Hi,

On 14 Oct 2013, at 08:47, Tony Rutkowski wrote:

> So as many have opined, the IETF is a
> technical standards body, not an evangelical organization for=20
> socio-political views, and hopefully will continue to do what it does=20
> well - produce usable protocols - and leave the implementation choices=20
> to others based on their assessment of the risk.


Yes, but in doing so, it should provide the ability for the individual user=
s, whether companies or individuals, to mitigate their risks.  If technical=
 standards do not include a mandatory option (MTI) of privacy protection th=
ey are making a political techno-decsion against privacy.  If the Internet =
cannot be used in a manner that enhances privacy, for those who value priva=
cy, but only maximizes surveillance based security for those who value surv=
eillance, then it looks to me like we are acting evangelically.

We can only maintain the belief that our technology and protocols are neutr=
al if they can be used by people of diverse socio-political views.

So while I can see problems with MTU, I think genuine MTI (and perhaps some=
 MTU) is needed for privacy enhancements at a level that matches the MTIs a=
nd MTUs for security.  I technical neutrality requires it.

avri

From kent@bbn.com  Mon Oct 14 07:33:17 2013
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Date: Mon, 14 Oct 2013 10:33:01 -0400
From: Stephen Kent <kent@bbn.com>
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Cc: perpass <perpass@ietf.org>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Alissa,
> Hi Steve,
>
> I'd like to challenge your assertions that because Gmail and Facebook h=
ave billions of users, the bulk of Internet users do not care about perva=
sive state surveillance of all or most of their of their Internet communi=
cations, and therefore the IETF's attempts at promoting strong security h=
ave thus far been sufficient. Privacy is often valued contextually. The f=
act that a user accepts the trade-offs that Gmail presents (accepting tha=
t a private company will scan her emails in exchange for a snappy interfa=
ce or beneficial network effects) does not mean that the same user is com=
fortable with pervasive government surveillance that could allow her to b=
e pursued (using police force) under legal standards that are often vague=
 or uncertain for anything she writes in every email she sends. The state=
's ability to impinge on a wide range of individual freedoms surpasses by=
 far the ability of any single private company to do so. The line between=
 private and public sector data collection has obviously blurred as more =
and more data is exchanged between the two, but that does not make the tw=
o of them equivalent.
I appreciate your analysis, but I don't necessarily agree with your=20
conclusions. The state has a
responsibility to provide for the security of its citizens. To the=20
extent that surveillance supports
this goal, it is potentially justified, irrespective of whether every=20
citizen agrees with the
methods. Corporate collection of personal data tends to be driven by=20
greed, not quite so noble
a goal :-).

I agree that the state has a more powerful capability to collect info=20
about Internet users, and
yes, there are no T's & C's to read and agree to (or, more likely ignore =

and agree to). But
that does not mean that we, as developers of Internet standards, are in=20
a position to know
whether all users feel that state vs. corporate surveillance is a=20
greater personal concern, and
thus warrants mandatory to use (vs. implement) security features.
> For the list: much of this thread's discussion seems to presume that th=
e business considerations behind individual companies' decisions about wh=
ether to deploy secure protocols or not are unchanged from what they were=
 four months ago prior to the beginning of the revelations. Yet elsewhere=
 there seems to be a whole lot of hand-wringing going on about how much b=
usiness is being lost or how nervous various customers are in the wake of=
 the revelations. Can we really assume that no IT managers in charge of e=
nterprise SIP deployments or middlebox-based backwards-compatability solu=
tions are even considering re-evaluating how they balance competing requi=
rements?
I'll defer to folks with more direct experience with these businesses,=20
but I have seen no such
change in perception. The only change I have seen is that enterprises=20
makign use of cloud storage
and backup are more concerned about the confidentiality of the data=20
stored there, and are considering
offshore alternatives.

Steve


From kent@bbn.com  Mon Oct 14 07:43:45 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Avri,
> ...
>
> Yes, but in doing so, it should provide the ability for the individual users, whether companies or individuals, to mitigate their risks.  If technical standards do not include a mandatory option (MTI) of privacy protection they are making a political techno-decsion against privacy.  If the Internet cannot be used in a manner that enhances privacy, for those who value privacy, but only maximizes surveillance based security for those who value surveillance, then it looks to me like we are acting evangelically.
>
> We can only maintain the belief that our technology and protocols are neutral if they can be used by people of diverse socio-political views.
>
> So while I can see problems with MTU, I think genuine MTI (and perhaps some MTU) is needed for privacy enhancements at a level that matches the MTIs and MTUs for security.  I technical neutrality requires it.
To first order, we're in agreement, i.e., MTI provides a reasonable 
basis for deploying privacy
measures when users and service providers choose to make use of them. If 
we fail to provide
MTI options, we deprive users and providers of the ability to engage in 
interoperable
security/privacy measures.

The question Stephen raised is whether that's enough. For me, the answer 
is yes, and going
beyond MTI to MTU is pursuing an "evangelical" path that we ought to avoid.

Since you alluded to "some MTU" above, the obvious question is what are 
examples of
MTU mechanisms that you support?

Steve

From derhoermi@gmx.net  Mon Oct 14 07:52:27 2013
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* Stephen Kent wrote:
>I understand the goal of making life harder for state surveillance.
>However, I am not willing (personally) to incur any degraded user 
>experience,
>premature cell phone battery depletion, etc in order to support this goal.
>I suspect, but cannot prove, that most users would express similar feelings.

We generally regard representative opinion polls conducted by reputable
polling organisations as adequate proof for statements like that and it
is reasonably inexpensive to commission them, so I think you can. The
problem is of course how to structure the interview, how to phrase the
questions, what kind of answers to offer, what information to provide
upfront, and so on.

I imagine, for instance, many people also do not want to incur degraded
user experience due to state surveillance, like being unable to work
jobs that require a security clearance or being put on a "no fly list"
because some automated system detected too many ungood words in messages
they sent or received; or losing their job because their employer went
out of business after losing the corporate espionage game with a foreign
power.

I suspect, if you asked people whether they are willing to give up, say,
10% battery life, or pay 10% more for their batteries, and be protected
against such threats, most would take the deal. In contrast, if you tell
the story from the other side, get 10% more battery and better chances
to stay in business because some NSA guys owe the CEO a favour, well, I
suspect that also sounds appealing to many.
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

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--047d7bdc131080e7ef04e8b4a55d
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Stephen,

"The state has a  responsibility to provide for the security of its
citizens. To the extent that surveillance supports
this goal, it is potentially justified, irrespective of whether every
citizen agrees with the  methods."

If this is the case why dont we hand a copy of our house key to the police?
This way the police can come around every evening and check what we are up
to.

Why not cameras on toilets as well?

Because mass surveillance (for good and bad) scares the Internet user. It
makes it less attractive to use the Internet. It restricts the Internet. It
violates the Universal Declaration of Human Rights (to which your country
is a signatory as well).

It is not the targeted surveillance but the unregulated mass surveillance
that is the problem.

The current IETF standards do not protect against mass surveillance
sufficiently.

regards,

Ralf



On Mon, Oct 14, 2013 at 3:33 PM, Stephen Kent <kent@bbn.com> wrote:

> Alissa,
>
>  Hi Steve,
>>
>> I'd like to challenge your assertions that because Gmail and Facebook
>> have billions of users, the bulk of Internet users do not care about
>> pervasive state surveillance of all or most of their of their Internet
>> communications, and therefore the IETF's attempts at promoting strong
>> security have thus far been sufficient. Privacy is often valued
>> contextually. The fact that a user accepts the trade-offs that Gmail
>> presents (accepting that a private company will scan her emails in exchange
>> for a snappy interface or beneficial network effects) does not mean that
>> the same user is comfortable with pervasive government surveillance that
>> could allow her to be pursued (using police force) under legal standards
>> that are often vague or uncertain for anything she writes in every email
>> she sends. The state's ability to impinge on a wide range of individual
>> freedoms surpasses by far the ability of any single private company to do
>> so. The line between private and public sector data collectio
>>
> n has obviously blurred as more and more data is exchanged between the
> two, but that does not make the two of them equivalent.
> I appreciate your analysis, but I don't necessarily agree with your
> conclusions. The state has a
> responsibility to provide for the security of its citizens. To the extent
> that surveillance supports
> this goal, it is potentially justified, irrespective of whether every
> citizen agrees with the
> methods. Corporate collection of personal data tends to be driven by
> greed, not quite so noble
> a goal :-).
>
> I agree that the state has a more powerful capability to collect info
> about Internet users, and
> yes, there are no T's & C's to read and agree to (or, more likely ignore
> and agree to). But
> that does not mean that we, as developers of Internet standards, are in a
> position to know
> whether all users feel that state vs. corporate surveillance is a greater
> personal concern, and
> thus warrants mandatory to use (vs. implement) security features.
>
>  For the list: much of this thread's discussion seems to presume that the
>> business considerations behind individual companies' decisions about
>> whether to deploy secure protocols or not are unchanged from what they were
>> four months ago prior to the beginning of the revelations. Yet elsewhere
>> there seems to be a whole lot of hand-wringing going on about how much
>> business is being lost or how nervous various customers are in the wake of
>> the revelations. Can we really assume that no IT managers in charge of
>> enterprise SIP deployments or middlebox-based backwards-compatability
>> solutions are even considering re-evaluating how they balance competing
>> requirements?
>>
> I'll defer to folks with more direct experience with these businesses, but
> I have seen no such
> change in perception. The only change I have seen is that enterprises
> makign use of cloud storage
> and backup are more concerned about the confidentiality of the data stored
> there, and are considering
> offshore alternatives.
>
>
> Steve
>
> ______________________________**_________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/**listinfo/perpass<https://www.ietf.org/mailman/listinfo/perpass>
>

--047d7bdc131080e7ef04e8b4a55d
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div><div><div><div>Stephen,<br><br>&quot;The state h=
as a=A0
responsibility to provide for the security of its citizens. To the extent t=
hat surveillance supports<br>
this goal, it is potentially justified, irrespective of whether every citiz=
en agrees with the=A0
methods.&quot;<br><br></div>If this is the case why dont we hand a copy of =
our house key to the police? This way the police can come around every even=
ing and check what we are up to.<br><br></div>Why not cameras on toilets as=
 well?<br>
<br></div>Because mass surveillance (for good and bad) scares the Internet =
user. It makes it less attractive to use the Internet. It restricts the Int=
ernet. It violates the Universal Declaration of Human Rights (to which your=
 country is a signatory as well).<br>
<br></div>It is not the targeted surveillance but the unregulated mass surv=
eillance that is the problem.<br><br></div>The current IETF standards do no=
t protect against mass surveillance sufficiently.<br><div><br>regards,<br>
<br>Ralf<br>=A0<br></div></div><div class=3D"gmail_extra"><br><br><div clas=
s=3D"gmail_quote">On Mon, Oct 14, 2013 at 3:33 PM, Stephen Kent <span dir=
=3D"ltr">&lt;<a href=3D"mailto:kent@bbn.com" target=3D"_blank">kent@bbn.com=
</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Alissa,<div class=3D"im"><br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Hi Steve,<br>
<br>
I&#39;d like to challenge your assertions that because Gmail and Facebook h=
ave billions of users, the bulk of Internet users do not care about pervasi=
ve state surveillance of all or most of their of their Internet communicati=
ons, and therefore the IETF&#39;s attempts at promoting strong security hav=
e thus far been sufficient. Privacy is often valued contextually. The fact =
that a user accepts the trade-offs that Gmail presents (accepting that a pr=
ivate company will scan her emails in exchange for a snappy interface or be=
neficial network effects) does not mean that the same user is comfortable w=
ith pervasive government surveillance that could allow her to be pursued (u=
sing police force) under legal standards that are often vague or uncertain =
for anything she writes in every email she sends. The state&#39;s ability t=
o impinge on a wide range of individual freedoms surpasses by far the abili=
ty of any single private company to do so. The line between private and pub=
lic sector data collectio<br>

</blockquote>
n has obviously blurred as more and more data is exchanged between the two,=
 but that does not make the two of them equivalent.<br></div>
I appreciate your analysis, but I don&#39;t necessarily agree with your con=
clusions. The state has a<br>
responsibility to provide for the security of its citizens. To the extent t=
hat surveillance supports<br>
this goal, it is potentially justified, irrespective of whether every citiz=
en agrees with the<br>
methods. Corporate collection of personal data tends to be driven by greed,=
 not quite so noble<br>
a goal :-).<br>
<br>
I agree that the state has a more powerful capability to collect info about=
 Internet users, and<br>
yes, there are no T&#39;s &amp; C&#39;s to read and agree to (or, more like=
ly ignore and agree to). But<br>
that does not mean that we, as developers of Internet standards, are in a p=
osition to know<br>
whether all users feel that state vs. corporate surveillance is a greater p=
ersonal concern, and<br>
thus warrants mandatory to use (vs. implement) security features.<div class=
=3D"im"><br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
For the list: much of this thread&#39;s discussion seems to presume that th=
e business considerations behind individual companies&#39; decisions about =
whether to deploy secure protocols or not are unchanged from what they were=
 four months ago prior to the beginning of the revelations. Yet elsewhere t=
here seems to be a whole lot of hand-wringing going on about how much busin=
ess is being lost or how nervous various customers are in the wake of the r=
evelations. Can we really assume that no IT managers in charge of enterpris=
e SIP deployments or middlebox-based backwards-compatability solutions are =
even considering re-evaluating how they balance competing requirements?<br>

</blockquote></div>
I&#39;ll defer to folks with more direct experience with these businesses, =
but I have seen no such<br>
change in perception. The only change I have seen is that enterprises makig=
n use of cloud storage<br>
and backup are more concerned about the confidentiality of the data stored =
there, and are considering<br>
offshore alternatives.<div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
Steve<br>
<br>
______________________________<u></u>_________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org" target=3D"_blank">perpass@ietf.org</a><=
br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/<u></u>listinfo/perpass</a><br>
</div></div></blockquote></div><br></div>

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From: Ralf Skyper Kaiser <skyper@thc.org>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hi,

I understand the goal of making life harder for state surveillance.

> However, I am not willing (personally) to incur any degraded user
> experience,
> premature cell phone battery depletion, etc in order to support this goal.
> I suspect, but cannot prove, that most users would express similar
> feelings.
>
>

I remember the same argument from the last decade when the Internet
transitioned from TELNET to SSH. Some people said SSH would cause to much
internet traffic and the servers could not handle the extra crypto.

Imagine today's internet with every admin still using TELNET.

Where are these admins now? Speak up please.

regards,

Ralf

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<div dir=3D"ltr">Hi,<br><br>I understand the goal of making life harder for=
 state surveillance.<br><div class=3D"gmail_extra"><div class=3D"gmail_quot=
e"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex">

However, I am not willing (personally) to incur any degraded user experienc=
e,<br>
premature cell phone battery depletion, etc in order to support this goal.<=
br>
I suspect, but cannot prove, that most users would express similar feelings=
.<br>
<br></blockquote></div><br><br></div><div class=3D"gmail_extra">I remember =
the same argument from the last decade when the Internet transitioned from =
TELNET to SSH. Some people said SSH would cause to much internet traffic an=
d the servers could not handle the extra crypto.<br>
<br></div><div class=3D"gmail_extra">Imagine today&#39;s internet with ever=
y admin still using TELNET.<br></div><div class=3D"gmail_extra"><br></div><=
div class=3D"gmail_extra">Where are these admins now? Speak up please.<br><=
br>
regards,<br><br>Ralf<br><br></div><div class=3D"gmail_extra"><br></div></di=
v>

--001a11347edc722c2b04e8b4bdf5--

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> Since you alluded to "some MTU" above, the obvious question is what =
are examples of
> MTU mechanisms that you support?

I don't know.  But just as I beleive we sometimes decide some things are =
so critical to security that they must be used, I would like to see us =
leave open the discussion of whether there may, on occasion, be things =
that require this. =20

They may, for example, be protocol options in servers that unless used, =
prevent users from optionally using a privacy feature.  But I am not far =
enough down into the weeds on this issue to have an example at the =
moment.  I admit that in many occasions MTU is probably more of a policy =
decision than a technical one, but not always.

avri



On 14 Oct 2013, at 10:43, Stephen Kent wrote:

> Avri,
>> ...
>>=20
>> Yes, but in doing so, it should provide the ability for the =
individual users, whether companies or individuals, to mitigate their =
risks.  If technical standards do not include a mandatory option (MTI) =
of privacy protection they are making a political techno-decsion against =
privacy.  If the Internet cannot be used in a manner that enhances =
privacy, for those who value privacy, but only maximizes surveillance =
based security for those who value surveillance, then it looks to me =
like we are acting evangelically.
>>=20
>> We can only maintain the belief that our technology and protocols are =
neutral if they can be used by people of diverse socio-political views.
>>=20
>> So while I can see problems with MTU, I think genuine MTI (and =
perhaps some MTU) is needed for privacy enhancements at a level that =
matches the MTIs and MTUs for security.  I technical neutrality requires =
it.
> To first order, we're in agreement, i.e., MTI provides a reasonable =
basis for deploying privacy
> measures when users and service providers choose to make use of them. =
If we fail to provide
> MTI options, we deprive users and providers of the ability to engage =
in interoperable
> security/privacy measures.
>=20
> The question Stephen raised is whether that's enough. For me, the =
answer is yes, and going
> beyond MTI to MTU is pursuing an "evangelical" path that we ought to =
avoid.
>=20
> Since you alluded to "some MTU" above, the obvious question is what =
are examples of
> MTU mechanisms that you support?
>=20
> Steve
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>=20


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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Bjoern,
> * Stephen Kent wrote:
>> I understand the goal of making life harder for state surveillance.
>> However, I am not willing (personally) to incur any degraded user
>> experience,
>> premature cell phone battery depletion, etc in order to support this goal.
>> I suspect, but cannot prove, that most users would express similar feelings.
> We generally regard representative opinion polls conducted by reputable
> polling organisations as adequate proof for statements like that and it
> is reasonably inexpensive to commission them, so I think you can. The
> problem is of course how to structure the interview, how to phrase the
> questions, what kind of answers to offer, what information to provide
> upfront, and so on.
An opinion poll is not necessarily the best way to measure the
relative priority of individuals in matters like this. The behavior
of individuals may be a better measure. (Individuals may want to
say that they are in favor of X or against Y, but their behavior
may not be consistent with their response to a poll.
> I imagine, for instance, many people also do not want to incur degraded
> user experience due to state surveillance, like being unable to work
> jobs that require a security clearance or being put on a "no fly list"
> because some automated system detected too many ungood words in messages
> they sent or received; or losing their job because their employer went
> out of business after losing the corporate espionage game with a foreign
> power.
> I suspect, if you asked people whether they are willing to give up, say,
> 10% battery life, or pay 10% more for their batteries, and be protected
> against such threats, most would take the deal. In contrast, if you tell
> the story from the other side, get 10% more battery and better chances
> to stay in business because some NSA guys owe the CEO a favour, well, I
> suspect that also sounds appealing to many.
Yes, depending on how one asks the questions, contradictory responses
may be elicited.

Steve

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Steve,

Brian's draft defines "pervasive surveillance" as
> the practice of
> surveillance at widespread observation points, without any
> modification of network traffic, and without any particular
> surveillance target in mind.
There are a couple of obvious deficiencies here..

As a starter, the definition is self-contradictory.
The first sentence in the introduction uses RFC6973's
definition of surveillance with is aimed at an individual
and concatenates it with "pervasive" to come up with
something that says there "is no particular surveillance
target in  mind."  Which is it?  You cannot logically
concatenate the two notions together.

You also don't deal with timeframes.  Most Big Data
implementations for all kinds of purposes, acquire
observations and sort out the metadata.  That's how
particular particular targets (e.g., purveyors of cheap
nuclear devices) are found, and it's mandated by law
under the E.U. Data Retention Directive.

Additionally, all this is context dependent as there all
kinds of bases for exactly this kind of activity that are
operational, commercial, and legal.  It would also be
interesting to see a definition of "network."  Radio
networks have been subject to constant monitoring
for many decades.  Fast forwarding to SDNs and Cloud
Computing services, renders most of these this efforts
irrelevant.

Then after proffering a definition, the religious statement
appears: "we presume a priori that communications systems
should aim to provide appropriate privacy guarantees to
their users, and that such pervasive surveillance is therefore
a bad thing."  "Presume a priori?"  There are innumerable
contexts where privacy - which is itself a socio-political-
legal abstraction - is not relevant or applicable.

Similarly, the "perfect passive adversary" definition is a
self-contradiction.  If the observer is taking no action,
there is no threat by definition.

> We explicitly assume the PPA does not have the ability to compromise
> trusted systems at either the initiator or a recipient of a
> communication.
Give me a break.  Here again, an assertion is made that
is simply not credible.  Essentially all systems are
capable of compromise - either technically, lawfully,
or through insider threats (which is generally regarded
as the greatest threat).

If you want to analyze any of this within the context of
substantive ongoing work, you should consider applying
the STIX threat analysis/exchange model.

This kind of work tends to turn the IETF into a script
writing exercise for the third season of VEEP.

--tony

On 10/14/2013 9:43 AM, Stephen Farrell wrote:
> Personally, I entirely disagree. It is true that we
> don't have a worked out threat model for this yet,
> but Brian's draft is a start on which I hope we'll
> build so that protocol designers, implementers and
> those deploying networks and services will have a
> useful threat model to use when doing their work.


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Subject: [perpass] threat model draft (was: Re: mandatory-to-implement vs. more?)
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Hi Tony,

(Subject lines are cheap and helpful, let's try use
'em a bit better please.)

On 10/14/2013 04:35 PM, Tony Rutkowski wrote:
> Steve,
> 
> Brian's draft defines "pervasive surveillance" as
>> the practice of
>> surveillance at widespread observation points, without any
>> modification of network traffic, and without any particular
>> surveillance target in mind.
> There are a couple of obvious deficiencies here..
> 
> As a starter, the definition is self-contradictory.
> The first sentence in the introduction uses RFC6973's
> definition of surveillance with is aimed at an individual
> and concatenates it with "pervasive" to come up with
> something that says there "is no particular surveillance
> target in  mind."  Which is it?  You cannot logically
> concatenate the two notions together.

I don't see the contradiction. I'm sure wordsmithing will
be needed of course, and we'll want a better definition
of pervasive monitoring for sure. (See earlier comments
on the draft in the list archive.)

> You 

s/You/the draft/ I guess.

> also don't deal with timeframes.  Most Big Data
> implementations for all kinds of purposes, acquire
> observations and sort out the metadata.  That's how
> particular particular targets (e.g., purveyors of cheap
> nuclear devices) are found, and it's mandated by law
> under the E.U. Data Retention Directive.

Timeframes are an interesting aspect to consider, I agree.

> Additionally, all this is context dependent as there all
> kinds of bases for exactly this kind of activity that are
> operational, commercial, and legal.  It would also be
> interesting to see a definition of "network."  Radio
> networks have been subject to constant monitoring
> for many decades.  Fast forwarding to SDNs and Cloud
> Computing services, renders most of these this efforts
> irrelevant.

Huh? I don't get what you mean.

> Then after proffering a definition, the religious statement
> appears: "we presume a priori that communications systems
> should aim to provide appropriate privacy guarantees to
> their users, and that such pervasive surveillance is therefore
> a bad thing."  "Presume a priori?"  

Yep. For this draft, such an a-priori assumption is ok
I think - the point is so that when its done (and its a
-00) it'll be useful for protocol designers who need to
consider this threat model.

So its not at all "religious" here (and incidentally,
I figure such terms are purely pejorative, and not
generally helpful).

> There are innumerable
> contexts where privacy - which is itself a socio-political-
> legal abstraction - is not relevant or applicable.

Can you enumerate some real cases where someone might
be designing an Internet protocol and where privacy
is irrelevant or not applicable?

That kind of scoping could be useful, if such cases
exist.

> Similarly, the "perfect passive adversary" definition is a
> self-contradiction.  If the observer is taking no action,
> there is no threat by definition.
> 
>> We explicitly assume the PPA does not have the ability to compromise
>> trusted systems at either the initiator or a recipient of a
>> communication.
> Give me a break.  

Ok, take a break:-)

> Here again, an assertion is made that
> is simply not credible.  Essentially all systems are
> capable of compromise - either technically, lawfully,
> or through insider threats (which is generally regarded
> as the greatest threat).

As it happens I also commented on the definitions, and I
agree they do need work - that's what'll happen as the
draft progresses.

> If you want to analyze any of this within the context of
> substantive ongoing work, you should consider applying
> the STIX threat analysis/exchange model.

Do you mean this? [1]

S.

[1] http://stix.mitre.org/

> 
> This kind of work tends to turn the IETF into a script
> writing exercise for the third season of VEEP.
> 
> --tony
> 
> On 10/14/2013 9:43 AM, Stephen Farrell wrote:
>> Personally, I entirely disagree. It is true that we
>> don't have a worked out threat model for this yet,
>> but Brian's draft is a start on which I hope we'll
>> build so that protocol designers, implementers and
>> those deploying networks and services will have a
>> useful threat model to use when doing their work.
> 
> 
> 

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On 10/14/2013 03:43 PM, Stephen Kent wrote:
> Avri,
>> ...
...
>> So while I can see problems with MTU, I think genuine MTI (and perhaps
>> some MTU) is needed for privacy enhancements at a level that matches
>> the MTIs and MTUs for security.  I technical neutrality requires it.
> To first order, we're in agreement, i.e., MTI provides a reasonable
> basis for deploying privacy
> measures when users and service providers choose to make use of them. If
> we fail to provide
> MTI options, we deprive users and providers of the ability to engage in
> interoperable
> security/privacy measures.
> 
> The question Stephen raised is whether that's enough. For me, the answer
> is yes, and going
> beyond MTI to MTU is pursuing an "evangelical" path that we ought to avoid.

That's not an unreasonable answer. However, we do have to
face the fact that a lot of times MTI stuff is just not
used when you and I would probably argue that it really
ought be used. It also not unreasonable to say that doing
more-than-MTI won't fix that, but that's what I'd like
to explore here.

> Since you alluded to "some MTU" above, the obvious question is what are
> examples of
> MTU mechanisms that you support?

Good question. Without saying I "support" it, rtcweb does
mandate more than MTI for e.g. DTLS-SRTP - the current
draft [1] says it MUST be offered as the default. I think
I'd maybe "support" it more if I understood better what
kind of key management  will be behind that, which I don't
yet, but its a data point for what a lot of folks think
will be an important protocol that does take a more-than-MTI
approach.

Maybe someone who knows more about that can explain the
reasoning behind that decision and whether they think it
could or should be generalised?

Other examples could be good too, esp if they're actually
used and not just RFC 6919 text;-)

S.

[1]
http://tools.ietf.org/html/draft-ietf-rtcweb-security-arch-07#section-5.5

> 
> Steve
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

From derhoermi@gmx.net  Mon Oct 14 10:04:05 2013
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From: Bjoern Hoehrmann <derhoermi@gmx.net>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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* Tony Rutkowski wrote:
>As a starter, the definition is self-contradictory.
>The first sentence in the introduction uses RFC6973's
>definition of surveillance with is aimed at an individual
>and concatenates it with "pervasive" to come up with
>something that says there "is no particular surveillance
>target in  mind."  Which is it?  You cannot logically
>concatenate the two notions together.

You can resolve this by taking it as meaning everyone is a target, or
simply accept that this is a common and easily understood construction
just like we might talk of a "dry lake" even though we normally under-
stand a lake to be a water body.

>Similarly, the "perfect passive adversary" definition is a
>self-contradiction.  If the observer is taking no action,
>there is no threat by definition.

It seems to me the "passive" here is jargon and meant with respect to
"the bits on the wire". An "active" attacker would manipulate bits on
the wire, while a "passive" one does not; that does not stop them from
taking other actions than manipulating the bits on the wire. Also, it
should be clear that observation is an action and a threat by itself.
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

From kent@bbn.com  Mon Oct 14 10:39:32 2013
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Cc: perpass <perpass@ietf.org>, Avri Doria <avri@acm.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Stephen,
...
> That's not an unreasonable answer. However, we do have to
> face the fact that a lot of times MTI stuff is just not
> used when you and I would probably argue that it really
> ought be used. It also not unreasonable to say that doing
> more-than-MTI won't fix that, but that's what I'd like
> to explore here.
This may be where we have a significant disagreement. I am comfortable
developing security/privacy mechanisms that users and providers may
choose to employ, because compliant implementations will make it 
available in an
interoperable fashion. Insisting that a set of such mechanisms be employed,
seems beyond our remit.
> Good question. Without saying I "support" it, rtcweb does mandate more 
> than MTI for e.g. DTLS-SRTP - the current draft [1] says it MUST be 
> offered as the default. I think I'd maybe "support" it more if I 
> understood better what kind of key management will be behind that, 
> which I don't yet, but its a data point for what a lot of folks think 
> will be an important protocol that does take a more-than-MTI approach. 
> Maybe someone who knows more about that can explain the reasoning 
> behind that decision and whether they think it could or should be 
> generalised? Other examples could be good too, esp if they're actually 
> used and not just RFC 6919 text;-) S. [1] 
> http://tools.ietf.org/html/draft-ietf-rtcweb-security-arch-07#section-5.5

6919's "MUST (but we know you won't) was motivated by security MUSTs in 
a wide range of
docs. the RTCWEB doc isn't an RFC yet, so we'll have to see what 
happens.  Also, this is
an arch doc. As the author of 4301, the IPsec arch doc, I can attest 
that very, very few
implementation are compliant with all of it's MUSTs. Implementors tend 
to focus more on
bits on the wire than on other protocol "features"

Steve

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Cc: perpass <perpass@ietf.org>, Stephen Kent <kent@bbn.com>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 14, 2013, at 8:01 AM, Ralf Skyper Kaiser <skyper@thc.org> wrote:

> Hi,
>=20
> I understand the goal of making life harder for state surveillance.
> However, I am not willing (personally) to incur any degraded user =
experience,
> premature cell phone battery depletion, etc in order to support this =
goal.
> I suspect, but cannot prove, that most users would express similar =
feelings.

the browser/CA transition from 1024 to 2048 bit certs is ongoing albiet =
done soon. That's a cost that everyone is paying for whether they know =
it or not=85 We therefore have an internet scale existence proof.

>=20
>=20
> I remember the same argument from the last decade when the Internet =
transitioned from TELNET to SSH. Some people said SSH would cause to =
much internet traffic and the servers could not handle the extra crypto.
>=20
> Imagine today's internet with every admin still using TELNET.
>=20
> Where are these admins now? Speak up please.
>=20
> regards,
>=20
> Ralf
>=20
>=20
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


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From kent@bbn.com  Mon Oct 14 10:50:46 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Ralf,
> Stephen,
>
> "The state has a  responsibility to provide for the security of its 
> citizens. To the extent that surveillance supports
> this goal, it is potentially justified, irrespective of whether every 
> citizen agrees with the  methods."
>
> If this is the case why dont we hand a copy of our house key to the 
> police? This way the police can come around every evening and check 
> what we are up to.
An exaggerated, poor analogy, but I suspect you know that.
> Why not cameras on toilets as well?
maintenance issues?
> Because mass surveillance (for good and bad) scares the Internet user. 
> It makes it less attractive to use the Internet. It restricts the 
> Internet. It violates the Universal Declaration of Human Rights (to 
> which your country is a signatory as well).
As Stephen noted, Internet standards are used throughout the world, so 
whether a given country is
a signatory to the UDHR seems irrelevant.

If most users feel that security and privacy are high priorities, why do 
so many users download
free apps that monitor aspects of mobile phone use and direct ads 
accordingly? My position, in
part, is that people behave in a fashion that suggests that personal 
privacy is not a very
high priority when it comes to use of the Internet.
> It is not the targeted surveillance but the unregulated mass 
> surveillance that is the problem.
>
> The current IETF standards do not protect against mass surveillance 
> sufficiently.
On what objective basis can one say that, i.e., who gets to decide what 
is "sufficient?"

Steve



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Ralf,

I don't recall such comments. perhaps we travel in different circles.

Which IETF meetings have you attended over the past 20 years?

Steve
> Hi,
>
> I understand the goal of making life harder for state surveillance.
>
>     However, I am not willing (personally) to incur any degraded user
>     experience,
>     premature cell phone battery depletion, etc in order to support
>     this goal.
>     I suspect, but cannot prove, that most users would express similar
>     feelings.
>
>
>
> I remember the same argument from the last decade when the Internet 
> transitioned from TELNET to SSH. Some people said SSH would cause to 
> much internet traffic and the servers could not handle the extra crypto.
>
> Imagine today's internet with every admin still using TELNET.
>
> Where are these admins now? Speak up please.
>
> regards,
>
> Ralf
>
>
>
>
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


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    Ralf,<br>
    <br>
    I don't recall such comments. perhaps we travel in different
    circles.<br>
    <br>
    Which IETF meetings have you attended over the past 20 years?<br>
    <br>
    Steve<br>
    <blockquote
cite="mid:CA+BZK2oaVxodkUf09KTMf2NPkBZEvC1E9QtxQR_fB7kiarqmEg@mail.gmail.com"
      type="cite">
      <div dir="ltr">Hi,<br>
        <br>
        I understand the goal of making life harder for state
        surveillance.<br>
        <div class="gmail_extra">
          <div class="gmail_quote">
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              However, I am not willing (personally) to incur any
              degraded user experience,<br>
              premature cell phone battery depletion, etc in order to
              support this goal.<br>
              I suspect, but cannot prove, that most users would express
              similar feelings.<br>
              <br>
            </blockquote>
          </div>
          <br>
          <br>
        </div>
        <div class="gmail_extra">I remember the same argument from the
          last decade when the Internet transitioned from TELNET to SSH.
          Some people said SSH would cause to much internet traffic and
          the servers could not handle the extra crypto.<br>
          <br>
        </div>
        <div class="gmail_extra">Imagine today's internet with every
          admin still using TELNET.<br>
        </div>
        <div class="gmail_extra"><br>
        </div>
        <div class="gmail_extra">Where are these admins now? Speak up
          please.<br>
          <br>
          regards,<br>
          <br>
          Ralf<br>
          <br>
        </div>
        <div class="gmail_extra"><br>
        </div>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
perpass mailing list
<a class="moz-txt-link-abbreviated" href="mailto:perpass@ietf.org">perpass@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/perpass">https://www.ietf.org/mailman/listinfo/perpass</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>

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From: Brian Trammell <trammell@tik.ee.ethz.ch>
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To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [perpass] threat model draft (was: Re: mandatory-to-implement vs. more?)
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hi Stephen, Tony,

a few further points inline...

On Oct 14, 2013, at 6:29 PM, Stephen Farrell <stephen.farrell@cs.tcd.ie> =
wrote:

>=20
> Hi Tony,
>=20
> (Subject lines are cheap and helpful, let's try use
> 'em a bit better please.)
>=20
> On 10/14/2013 04:35 PM, Tony Rutkowski wrote:
>> Steve,
>>=20
>> Brian's draft defines "pervasive surveillance" as
>>> the practice of
>>> surveillance at widespread observation points, without any
>>> modification of network traffic, and without any particular
>>> surveillance target in mind.
>> There are a couple of obvious deficiencies here..
>>=20
>> As a starter, the definition is self-contradictory.
>> The first sentence in the introduction uses RFC6973's
>> definition of surveillance with is aimed at an individual
>> and concatenates it with "pervasive" to come up with
>> something that says there "is no particular surveillance
>> target in  mind."  Which is it?  You cannot logically
>> concatenate the two notions together.
>=20
> I don't see the contradiction. I'm sure wordsmithing will
> be needed of course, and we'll want a better definition
> of pervasive monitoring for sure. (See earlier comments
> on the draft in the list archive.)

Although I don't represent the clarity or quality of the draft as =
anything other than -00, I also don't understand what's not clear here.

For those who don't have 6973 open in front of them:

"Surveillance is the observation or monitoring of an individual's =
communications or activities... [and] can be conducted by observers or =
eavesdroppers at any point along the communications path."

The argument is that this definition is deficient, in that it presumes =
an individual target. The whole conceptual framework of surveillance as =
an activity presumes a target. Legal surveillance requires one in order =
to get the necessary documents signed by the necessary oversight =
authority. Illegal surveillance generally has one in mind because it's =
cheaper that way.

(One could make a case that there are indiscriminate attacks by criminal =
networks, e.g. skimming keystrokes from compromised machines to search =
for credit-card numbers... while these are untargeted with respect to =
individual, they're also not really surveillance per 6973, in that it's =
specific types of data that's the goal of the eavesdropping, not the =
communication or the activity in general.)

"Pervasive surveillance" (to mangle the 6973 defintion) is "the =
observation or monitoring of all individuals' communications or =
activities." Removing the concept of targeting (even if targeting is =
done after the fact) changes the character of the activity, both in =
terms of its impact on the monitored individual(s) (and -- at the risk =
of getting too far from the engineering -- its impact on the civil =
society of which the monitored individuals are presumed to be members) =
and in terms of how the impact it has on protocol design. Specifically, =
in targetless surveillance, attempts not to become a target are =
meaningless. (Which goes back to someone's... I think it was Yoav's... =
stated desire to increase the cost of pervasive surveillance to the =
point that he dropped out of the target set, which captures nicely the =
level of sensitivity we have to infinite versus finite target sets.)

>> You=20
>=20
> s/You/the draft/ I guess.
>=20
>> also don't deal with timeframes.  Most Big Data
>> implementations for all kinds of purposes, acquire
>> observations and sort out the metadata.  That's how
>> particular particular targets (e.g., purveyors of cheap
>> nuclear devices) are found, and it's mandated by law
>> under the E.U. Data Retention Directive.
>=20
> Timeframes are an interesting aspect to consider, I agree.

+1. I think we should assume they are for all intents and purposes =
infinite.

>> Additionally, all this is context dependent as there all
>> kinds of bases for exactly this kind of activity that are
>> operational, commercial, and legal.  It would also be
>> interesting to see a definition of "network."  Radio
>> networks have been subject to constant monitoring
>> for many decades.  Fast forwarding to SDNs and Cloud
>> Computing services, renders most of these this efforts
>> irrelevant.
>=20
> Huh? I don't get what you mean.

I'm also confused, but I'm going to take a guess.

If by "cloud computing" you mean that protocols are being replaced by =
services, then yes, this is a problem. Nothing we can do on the network =
can protect against "PRISM"-class surveillance activities, by which I =
mean at least one endpoint of the communication (in this case, your =
email provider) cooperates with the observer. One could advocate the use =
of messaging protocols with end-to-end encryption of everything, as =
discussed in another thread on this list I've had to only halfway =
follow, as a workaround here. But then you'd have to come up with =
another business model to pay for email than the one we've arrived at to =
date.

>=20
>> Then after proffering a definition, the religious statement
>> appears: "we presume a priori that communications systems
>> should aim to provide appropriate privacy guarantees to
>> their users, and that such pervasive surveillance is therefore
>> a bad thing."  "Presume a priori?" =20
>=20
> Yep. For this draft, such an a-priori assumption is ok
> I think - the point is so that when its done (and its a
> -00) it'll be useful for protocol designers who need to
> consider this threat model.

The "limiting assumptions" of the threat model need, I think, to be more =
explicitly stated as such.

> So its not at all "religious" here (and incidentally,
> I figure such terms are purely pejorative, and not
> generally helpful).
>=20
>> There are innumerable
>> contexts where privacy - which is itself a socio-political-
>> legal abstraction - is not relevant or applicable.
>=20
> Can you enumerate some real cases where someone might
> be designing an Internet protocol and where privacy
> is irrelevant or not applicable?
>=20
> That kind of scoping could be useful, if such cases
> exist.
>=20
>> Similarly, the "perfect passive adversary" definition is a
>> self-contradiction.  If the observer is taking no action,
>> there is no threat by definition.

As Bj=F6rn pointed out, "passive" here is measurement jargon, opposed to =
"active": a passive adversary acts only as an observer, and cannot =
modify any traffic along the path. All they can to is observe. The =
question is: given that, what can they know? An observer that wanted to =
do much more and was positioned to do so could, of course -- there's a =
tradeoff here in terms of risk of detection of the observer.

(As an aside, I'll note that "perfect passive adversary" collides with a =
related-enough-to-be-dangerous term in the anonymity literature, such =
that it will be renamed in a future revision.)

>>> We explicitly assume the PPA does not have the ability to compromise
>>> trusted systems at either the initiator or a recipient of a
>>> communication.
>> Give me a break. =20
>=20
> Ok, take a break:-)
>=20
>> Here again, an assertion is made that
>> is simply not credible.  Essentially all systems are
>> capable of compromise - either technically, lawfully,
>> or through insider threats (which is generally regarded
>> as the greatest threat).
>=20
> As it happens I also commented on the definitions, and I
> agree they do need work - that's what'll happen as the
> draft progresses.

And this is another limiting assumption. We are explicitly not treating =
these compromises _in this threat model_. Why? First, because if the =
observer owns your terminal or the terminal at the other endpoint, there =
is nothing you can do as a protocol designer. The game is over. What to =
do in that case is best handled at layer 9. We also make the explicit =
assumption that crypto works as advertised. That's also a risky =
assumption. Why do we make it? Because it's best treated somewhere else =
(and by someone else -- I learned years ago, when I was young and didn't =
know any better, with a home-spun Blowfish implementation, that I'm no =
cryptographer).

Best regards,

Brian

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From: Ralf Skyper Kaiser <skyper@thc.org>
To: Stephen Kent <kent@bbn.com>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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> If most users feel that security and privacy are high priorities, why do
> so many users download
> free apps that monitor aspects of mobile phone use and direct ads
> accordingly? My position, in
> part, is that people behave in a fashion that suggests that personal
> privacy is not a very
> high priority when it comes to use of the Internet.
>
>
That's like saying "People should not have airbags because they should not
drive ruthless or fast in the first place. They surely do not care about
their safety so why should we invent the airbag?".

regards,

Ralf

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><div class=3D"gmail_quote">=
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
If most users feel that security and privacy are high priorities, why do so=
 many users download<br>
free apps that monitor aspects of mobile phone use and direct ads according=
ly? My position, in<br>
part, is that people behave in a fashion that suggests that personal privac=
y is not a very<br>
high priority when it comes to use of the Internet.<div class=3D"im"><br></=
div></blockquote></div><br></div><div class=3D"gmail_extra">That&#39;s like=
 saying &quot;People should not have airbags because they should not drive =
ruthless or fast in the first place. They surely do not care about their sa=
fety so why should we invent the airbag?&quot;. <br>
<br>regards,<br><br>Ralf<br><br></div></div>

--047d7bdc131031aa3a04e8b7aa25--

From rutkowski.tony@gmail.com  Mon Oct 14 11:56:05 2013
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From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] threat model draft
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Hi Brian et al.,

This has been kind of fun to watch - based
on someone's note about it.  But I'm not
into this kind of far out academic religious
stuff and have real work to do.

But have fun.

--tony

From brian.e.carpenter@gmail.com  Mon Oct 14 12:13:21 2013
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Cc: perpass <perpass@ietf.org>, rutkowski.tony@gmail.com, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] threat model draft
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On 15/10/2013 06:57, Brian Trammell wrote:
...
>>> Additionally, all this is context dependent as there all
>>> kinds of bases for exactly this kind of activity that are
>>> operational, commercial, and legal.  It would also be
>>> interesting to see a definition of "network."  Radio
>>> networks have been subject to constant monitoring
>>> for many decades.  Fast forwarding to SDNs and Cloud
>>> Computing services, renders most of these this efforts
>>> irrelevant.
>> Huh? I don't get what you mean.
> 
> I'm also confused, but I'm going to take a guess.
> 
> If by "cloud computing" you mean that protocols are being replaced by services, then yes, this is a problem. Nothing we can do on the network can protect against "PRISM"-class surveillance activities, by which I mean at least one endpoint of the communication (in this case, your email provider) cooperates with the observer. 

A realisation I had while watching "Terms and conditions may apply" on Sunday
is that it's even worse. Given the weak privacy protection on the social
networks, a very large amount of traffic analysis and personal behaviour
analysis is possible without needing the cooperation of even one endpoint.
You just scrape stuff off the social network, squirt it through HADOOP,
and out comes a list of targets worthy of detailed investigation.
That is definitely part of today's threat model.

I'd say we actually have a hierarchy of threats to consider, starting with
'big data' analysis of publicly available data and ending with traditional
personally targetted wiretapping.

   Brian C

From ajs@anvilwalrusden.com  Mon Oct 14 12:26:40 2013
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Date: Mon, 14 Oct 2013 15:26:40 -0400
From: Andrew Sullivan <ajs@anvilwalrusden.com>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Mon, Oct 14, 2013 at 01:50:36PM -0400, Stephen Kent wrote:

> accordingly? My position, in
> part, is that people behave in a fashion that suggests that personal
> privacy is not a very
> high priority when it comes to use of the Internet.

While I have some sympathy for the above, I think it runs the risk of
a considerable oversimplification of the behaviour model of users.
Most importantly, I think it contains in it the sort of picture of end
users that is frequently part of _homo economicus_: a rational,
good-maximising agent.  Just as in economics, however, I suspect that
peoples' security decision-making actually relies on a number of
principles that we can scarcely believe are rational.  For instance,
it could just as easily be that people using privacy-invading apps
have convinced themselves of the utility of data protection policies,
or think that they're too individually insignificant for anyone to
care about.  There could also be (suppressed) cognitivie dissonance
involved.  Finally, there's the issue of how usable much of the
security support in systems is when actual users encounter it.

Best,

A

-- 
Andrew Sullivan
ajs@anvilwalrusden.com

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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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>
>     If most users feel that security and privacy are high priorities,
>     why do so many users download
>     free apps that monitor aspects of mobile phone use and direct ads
>     accordingly? My position, in
>     part, is that people behave in a fashion that suggests that
>     personal privacy is not a very
>     high priority when it comes to use of the Internet.
>
>
> That's like saying "People should not have airbags because they should 
> not drive ruthless or fast in the first place. They surely do not care 
> about their safety so why should we invent the airbag?".
>
> regards,
>
> Ralf
Your proposed analogy is really, really bad, yet again. But it does provide
a good basis for a better analogy.

Seat belts are an example of an MTI, mandated by government-level 
regulations.
There are state laws in the U.S. that make them MTU, in 33 states. Note that
the MTU provision is a weak one; an audible warning sounds for a few 
seconds,
and then is silent. If one were very serious about seat belt use, there 
could
be an ignition interlock. But, since seat belt use is not mandatory in all
U.S. states, such an interlock would be problematic for vehicle 
manufacturers.

Air bags were initially an alternative, passive restraint option, viewed as
equivalent to 3-point seat belts, when passive restraints were first 
mandated
in  1984 (for vehicles produced in 1989), and the regulation applied 
only to drivers,
not passengers. In 1998 the rules were changed to mandate airbags in 
addition to
(3-point) seat belts, for front seat passengers, as well as drivers.

Over time vehicle manufacturers have voluntarily added more air bags in 
cars,
as a selling point, i.e., they perceive that some buyers will pay more for
knee bags, etc.

So, some take aways from this (corrected) analogy are

     - MTI can be appropriate for safety (security/privacy) features

     - MTU is a problem for such featyures when products are used across 
a wide range of
       jurisdictions

     - a safety (security/privacy) feature will be offered by vendors 
(service providers)
       when they that it is valued by their customers


Steve

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<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    <br>
    <blockquote
cite="mid:CA+BZK2pfH9ZhBjcUVCTaD_ARXGCJ5AR1eVJF6g_=1OmM6TiAJw@mail.gmail.com"
      type="cite">
      <div dir="ltr"><br>
        <div class="gmail_extra">
          <div class="gmail_quote">
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              If most users feel that security and privacy are high
              priorities, why do so many users download<br>
              free apps that monitor aspects of mobile phone use and
              direct ads accordingly? My position, in<br>
              part, is that people behave in a fashion that suggests
              that personal privacy is not a very<br>
              high priority when it comes to use of the Internet.
              <div class="im"><br>
              </div>
            </blockquote>
          </div>
          <br>
        </div>
        <div class="gmail_extra">That's like saying "People should not
          have airbags because they should not drive ruthless or fast in
          the first place. They surely do not care about their safety so
          why should we invent the airbag?". <br>
          <br>
          regards,<br>
          <br>
          Ralf<br>
        </div>
      </div>
    </blockquote>
    Your proposed analogy is really, really bad, yet again. But it does
    provide<br>
    a good basis for a better analogy.<br>
    <br>
    Seat belts are an example of an MTI, mandated by government-level
    regulations.<br>
    There are state laws in the U.S. that make them MTU, in 33 states.
    Note that<br>
    the MTU provision is a weak one; an audible warning sounds for a few
    seconds,<br>
    and then is silent. If one were very serious about seat belt use,
    there could<br>
    be an ignition interlock. But, since seat belt use is not mandatory
    in all<br>
    U.S. states, such an interlock would be problematic for vehicle
    manufacturers.<br>
    <br>
    Air bags were initially an alternative, passive restraint option,
    viewed as<br>
    equivalent to 3-point seat belts, when passive restraints were first
    mandated<br>
    in&nbsp; 1984 (for vehicles produced in 1989), and the regulation applied
    only to drivers,<br>
    not passengers. In 1998 the rules were changed to mandate airbags in
    addition to<br>
    (3-point) seat belts, for front seat passengers, as well as drivers.<br>
    <br>
    Over time vehicle manufacturers have voluntarily added more air bags
    in cars,<br>
    as a selling point, i.e., they perceive that some buyers will pay
    more for<br>
    knee bags, etc.<br>
    <br>
    So, some take aways from this (corrected) analogy are<br>
    <br>
    &nbsp;&nbsp;&nbsp; - MTI can be appropriate for safety (security/privacy) features<br>
    <br>
    &nbsp;&nbsp;&nbsp; - MTU is a problem for such featyures when products are used
    across a wide range of <br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jurisdictions<br>
    <br>
    &nbsp;&nbsp;&nbsp; - a safety (security/privacy) feature will be offered by vendors
    (service providers) <br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; when they that it is valued by their customers<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
    <br>
    Steve<br>
  </body>
</html>

--------------090307020506040704030409--

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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> public sector data collectio
 n has obviously blurred as more and more data is exchanged between the two,
but that does not make the two of them equivalent.
I appreciate your analysis, but I don't necessarily agree with your
conclusions. The state has a responsibility to provide for the security of
its citizens. To the extent that surveillance supports this goal, it is
potentially justified, irrespective of whether every citizen agrees with the
methods. Corporate collection of personal data tends to be driven by greed,
not quite so noble a goal :-).

I agree that the state has a more powerful capability to collect info about
Internet users, and yes, there are no T's & C's to read and agree to (or,
more likely ignore and agree to). But that does not mean that we, as
developers of Internet standards, are in a position to know whether all
users feel that state vs. corporate surveillance is a greater personal
concern, and thus warrants mandatory to use (vs. implement) security
features.
> For the list: much of this thread's discussion seems to presume that the
business considerations behind individual companies' decisions about whether
to deploy secure protocols or not are unchanged from what they were four
months ago prior to the beginning of the revelations. Yet elsewhere there
seems to be a whole lot of hand-wringing going on about how much business is
being lost or how nervous various customers are in the wake of the
revelations. Can we really assume that no IT managers in charge of
enterprise SIP deployments or middlebox-based backwards-compatability
solutions are even considering re-evaluating how they balance competing
requirements?

[RS> ]  Short answer. No.  Especially if the cost far outweighs the
benefits.  

I'll defer to folks with more direct experience with these businesses, but I
have seen no such change in perception. The only change I have seen is that
enterprises makign use of cloud storage and backup are more concerned about
the confidentiality of the data stored there, and are considering offshore
alternatives.

Steve

_______________________________________________
perpass mailing list
perpass@ietf.org
https://www.ietf.org/mailman/listinfo/perpass


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Thread-Topic: [perpass] mandatory-to-implement vs. more?
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--_000_CE81BDE4A834Cjonpetersonneustarbiz_
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable


Would you agree though Steve that wearing seat belts is our best current pr=
actice for safety, and that we (if we imagine ourselves car designers) shou=
ld explain to people how unsafe the roads are and that they really should w=
ear seat belts? Not everyone who builds cars might feel like they need to t=
ake responsibility for explaining this, of course, but some will.

I don't want us to throw up our hands and say there's nothing to be done to=
 improve the situation because users don't understand security and some dep=
loyments would resist it. Here in the IETF, our responsibilities as partici=
pants differ from those of users and even operators. We write standards. I =
think we need to write standards that are clear about what people should do=
 to be secure on the Internet as we understand it. Our understanding of the=
 Internet has changed because of these revelations, and what we need to do =
has to change as well. I agree that we can't levy unrealistic mandates and =
hope for anything but our own irrelevance. But let's not swing too far in t=
he opposite direction here either.

Jon Peterson
Neustar, Inc.

From: Stephen Kent <kent@bbn.com<mailto:kent@bbn.com>>
Date: Monday, October 14, 2013 12:33 PM
To: Ralf Skyper Kaiser <skyper@thc.org<mailto:skyper@thc.org>>
Cc: perpass <perpass@ietf.org<mailto:perpass@ietf.org>>
Subject: Re: [perpass] mandatory-to-implement vs. more?



If most users feel that security and privacy are high priorities, why do so=
 many users download
free apps that monitor aspects of mobile phone use and direct ads according=
ly? My position, in
part, is that people behave in a fashion that suggests that personal privac=
y is not a very
high priority when it comes to use of the Internet.


That's like saying "People should not have airbags because they should not =
drive ruthless or fast in the first place. They surely do not care about th=
eir safety so why should we invent the airbag?".

regards,

Ralf
Your proposed analogy is really, really bad, yet again. But it does provide
a good basis for a better analogy.

Seat belts are an example of an MTI, mandated by government-level regulatio=
ns.
There are state laws in the U.S. that make them MTU, in 33 states. Note tha=
t
the MTU provision is a weak one; an audible warning sounds for a few second=
s,
and then is silent. If one were very serious about seat belt use, there cou=
ld
be an ignition interlock. But, since seat belt use is not mandatory in all
U.S. states, such an interlock would be problematic for vehicle manufacture=
rs.

Air bags were initially an alternative, passive restraint option, viewed as
equivalent to 3-point seat belts, when passive restraints were first mandat=
ed
in  1984 (for vehicles produced in 1989), and the regulation applied only t=
o drivers,
not passengers. In 1998 the rules were changed to mandate airbags in additi=
on to
(3-point) seat belts, for front seat passengers, as well as drivers.

Over time vehicle manufacturers have voluntarily added more air bags in car=
s,
as a selling point, i.e., they perceive that some buyers will pay more for
knee bags, etc.

So, some take aways from this (corrected) analogy are

    - MTI can be appropriate for safety (security/privacy) features

    - MTU is a problem for such featyures when products are used across a w=
ide range of
      jurisdictions

    - a safety (security/privacy) feature will be offered by vendors (servi=
ce providers)
      when they that it is valued by their customers


Steve

--_000_CE81BDE4A834Cjonpetersonneustarbiz_
Content-Type: text/html; charset="us-ascii"
Content-ID: <4038B8EE1A7191428C728AAC1D0432AA@neustar.biz>
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif; ">
<div><br>
</div>
<div>Would you agree though Steve that wearing seat belts is our best curre=
nt practice for safety, and that we (if we imagine ourselves car designers)=
 should explain to people how unsafe the roads are and that they really sho=
uld wear seat belts? Not everyone
 who builds cars might feel like they need to take responsibility for expla=
ining this, of course, but some will.</div>
<div><br>
</div>
<div>I don't want us to throw up our hands and say there's nothing to be do=
ne to improve the situation because users don't understand security and som=
e deployments would resist it. Here in the IETF, our responsibilities as pa=
rticipants differ from those of
 users and even operators. We write standards. I think we need to write sta=
ndards that are clear about what people should do to be secure on the Inter=
net as we understand it. Our understanding of the Internet has changed beca=
use of these revelations, and what
 we need to do has to change as well. I agree that we can't levy unrealisti=
c mandates and hope for anything but our own irrelevance. But let's not swi=
ng too far in the opposite direction here either.</div>
<div><br>
</div>
<div>Jon Peterson</div>
<div>Neustar, Inc.</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>Stephen Kent &lt;<a href=3D"m=
ailto:kent@bbn.com">kent@bbn.com</a>&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Monday, October 14, 2013 12:3=
3 PM<br>
<span style=3D"font-weight:bold">To: </span>Ralf Skyper Kaiser &lt;<a href=
=3D"mailto:skyper@thc.org">skyper@thc.org</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>perpass &lt;<a href=3D"mailto:p=
erpass@ietf.org">perpass@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>Re: [perpass] mandatory-to=
-implement vs. more?<br>
</div>
<div><br>
</div>
<div>
<div bgcolor=3D"#FFFFFF" text=3D"#000000"><br>
<blockquote cite=3D"mid:CA&#43;BZK2pfH9ZhBjcUVCTaD_ARXGCJ5AR1eVJF6g_=3D1OmM=
6TiAJw@mail.gmail.com" type=3D"cite">
<div dir=3D"ltr"><br>
<div class=3D"gmail_extra">
<div class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
If most users feel that security and privacy are high priorities, why do so=
 many users download<br>
free apps that monitor aspects of mobile phone use and direct ads according=
ly? My position, in<br>
part, is that people behave in a fashion that suggests that personal privac=
y is not a very<br>
high priority when it comes to use of the Internet.
<div class=3D"im"><br>
</div>
</blockquote>
</div>
<br>
</div>
<div class=3D"gmail_extra">That's like saying &quot;People should not have =
airbags because they should not drive ruthless or fast in the first place. =
They surely do not care about their safety so why should we invent the airb=
ag?&quot;.
<br>
<br>
regards,<br>
<br>
Ralf<br>
</div>
</div>
</blockquote>
Your proposed analogy is really, really bad, yet again. But it does provide=
<br>
a good basis for a better analogy.<br>
<br>
Seat belts are an example of an MTI, mandated by government-level regulatio=
ns.<br>
There are state laws in the U.S. that make them MTU, in 33 states. Note tha=
t<br>
the MTU provision is a weak one; an audible warning sounds for a few second=
s,<br>
and then is silent. If one were very serious about seat belt use, there cou=
ld<br>
be an ignition interlock. But, since seat belt use is not mandatory in all<=
br>
U.S. states, such an interlock would be problematic for vehicle manufacture=
rs.<br>
<br>
Air bags were initially an alternative, passive restraint option, viewed as=
<br>
equivalent to 3-point seat belts, when passive restraints were first mandat=
ed<br>
in&nbsp; 1984 (for vehicles produced in 1989), and the regulation applied o=
nly to drivers,<br>
not passengers. In 1998 the rules were changed to mandate airbags in additi=
on to<br>
(3-point) seat belts, for front seat passengers, as well as drivers.<br>
<br>
Over time vehicle manufacturers have voluntarily added more air bags in car=
s,<br>
as a selling point, i.e., they perceive that some buyers will pay more for<=
br>
knee bags, etc.<br>
<br>
So, some take aways from this (corrected) analogy are<br>
<br>
&nbsp;&nbsp;&nbsp; - MTI can be appropriate for safety (security/privacy) f=
eatures<br>
<br>
&nbsp;&nbsp;&nbsp; - MTU is a problem for such featyures when products are =
used across a wide range of
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jurisdictions<br>
<br>
&nbsp;&nbsp;&nbsp; - a safety (security/privacy) feature will be offered by=
 vendors (service providers)
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; when they that it is valued by their custome=
rs<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
<br>
Steve<br>
</div>
</div>
</span>
</body>
</html>

--_000_CE81BDE4A834Cjonpetersonneustarbiz_--

From mdietf@demmers.org  Mon Oct 14 16:09:46 2013
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From: Mike Demmers <mdietf@demmers.org>
To: Perpass List Submit <perpass@ietf.org>
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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On Sun, 13 Oct 2013 08:25:08 -0700
Leo Vegoda <leo@vegoda.org> wrote:

> I am not a security expert either but presumably people will need to
> export keys for backup and deployment on other systems. For
> instance, many people have something like a laptop computer, a
> smartphone and a tablet. Presumably, users would want to use the
> same keys on all those devices so that they can read all their
> e-mail no matter which device they use.
> 
> I also expect people would want to be able to revoke a key if a
> device is stolen and then generate a new key to replace it, back
> that up and distribute it to all the devices in use.

...

> So my questions are:

Excellent questions.

> - how do people use the same keys on all their devices?

OK. Keys are just small files. So this boils down to 'how do I securely transfer small files between my devices?'.

This involves private keys, so we really need to be a little careful with this one.

Here is how I think this might work:

Besides the normal keys that are generated when your MUA is first started, a 'device key' (device keypair, public and private key for the device) is generated. These are unique to each device, and you are prompted for 'device name' at some point ('Joe's tablet', 'Joe's Phone' etc.). So now we have a way to encode something that only one device can read.

But we need to exchange public keys. Since these are public keys, just about any way will work that will transfer a file. Best would be something completely local of course, but this could also be something like an attachment to an email. 

So: select menu item 'Friend a Device'

See:

"Friending a device means interchanging device public keys. This is required in order to be able to securely share your friending environment between all your devices that use email (home computer, tablet, phone, etc.). Each device must have the device public keys for all your other devices. This step only must be done once.

There are two ways you can make this key exchange:

1. You can export your device public key for the device you are currently using to a file, which will be called YOURDEVICENAME.devicepublickey. This is then copied to all your other devices using a disk, usbstick, local lan, or other means of locally copying files from one device to another. Then, on the other device, you select 'Import Other Device Public Key From file'. You must export the device public key from each device you use, and import it to the other devices.

This is the most secure means of making this key exchange since the device public key never leaves your local environment.

2. You can use email to send the device public key as well. This is slightly less secure, since your device public key will go over the network, where it could be seen by someone else. Your private key will still be completely safe though. This may be required for certain kinds of devices where other means are not possible. If you select this option, a new email message will be created, to yourself, that contains the device public key in the body of the email. You should send this, then on each device you wish to 'friend' as a device, call up the email and select from the menu 'Import Device Public Key From Current Email'.
You must do the to and from each device.

Select 'Method 1' 'Method 2' 'Abort'"

Now we have a way to encode transfers between devices.

To actually sync:

Select from menu: "Sync my complete email friending environment from this device to another"

See:

"Select device to sync to from list"

Select one.

"Select method:

1. Export to file, which will be called USERNAME.friendkeysenv. This will create a standard format file, encrypted with the other devices device public key, that can be copied over and imported and decoded.

2. Use email. This will create a standard format file, encrypted with the other devices public key, in the body of an email to send to yourself. Select 'Import Friend Environment From Current Email' from menu on the other device.

This will update all private public keys and private private keys on the remote device to be the same as on the source device ('master'). Any existing files will be overwritten."

That will sync a device to a master device, but we need another option, because life is messy. Ideally, we would have all our friending be on one device, and then replcate that environment to other devices. But people do not always follow such rules, and sometimes this is inconvenient or impossible.

So we also need a similar function that can copy just ONE new friend over to other devices. So if I friend someone on my phone in a meeting, I can later just import that one into my master.

This would work just like the above function, but would create a file with just one name in it, in some standard format, so the importing device will know to just append it.

Well, that's a bit awkward, isn't it? What I really want as a user is something like

Hit sync button

See 'Select device from list'

Everything else handled automatically.

Can that be done? 

The very first step, that only has to be done once - the initial device public key exchange, pretty much has to be done the way shown. We can't have a device just automatically grabbing anothers public key through some protocol, it would be less secure. The user really needs to be in control of that from the device sending the key, to be sure only his own devices are in his inner circle.

But after that...can't be done by the file method since we do not know ahead of time how files might be transferred between two random devices.

Perhaps through email, by keeping track of state similarly to how the friending stuff works. IF this became standardized, we would at least know that the email program on the other end (and we don't really have control of what email program is running on many devices, like phones) would be able to handle that somehow.

-This is important- 

A sort of 'Default Deny' standard way of creating these files and formats could be created, but what I really feel is that having a way of exchanging a crypto environment _that is tied to some particular 'Default Deny' standard or program is the wrong way to go. What I WANT to use for this is standard formats for keys, key exchanges, whole key environment exchanges, using standard methods. That could be used by ANY program.

The difficulties here point up a real, serious flaw in the current crypto ecosystem, I believe, which is this: there are not enough GENERIC standards for crypto. Mostly because all this is still really new, everything seems to have developed in isolation, each protocol or program more or less in its own world, tied to a particular program. Often even when doing identical things, names are different, locations are unpredictable. There are subtle differences in the way things are done that should be the same, and standardized.

For example, consider where my email public/private keys are kept for gnupg. They are kept in /~user/.gnupg/. They are actually in a little database, formatted in a certain way, probably unique to gnupg.
I suppose if I used pgp, they would be in ~user/.pgp/. Probably with  different format. My ssh keys are in /~user/.ssh, not in a database, stored in a different way. Here, even within a single application, all the private and public keys even have different names, and are stored in a different way. And not in a database.

id_dsa.pub
id_rsa.pub
identity.pub

Here we have some metadata in the actual name, but it is pointless, because:

# more id_dsa.pub 
ssh-dss AAAAB3NzaC...

that metadata is already in the file itself.

Ssh has a list of authorized keys in 'authorized_keys'. Whatever gpupgs equivalent is, is stored in a completely different form. Look up 'using gpg keys for my ssh keys' in Google to see people struggling to do something that SHOULD be simple. (Even if not, in my opinion, wise.)

Gnupg has other uses than just email, why tie all the email keys to this one program?

Why not have a generic place for those email keys, something like /~user/.crypto/email/publickeys/ with some kind of standard naming scheme? That way, if a user used two different email programs, things would just work the same. If you WANTED, for some reason, one to be different, just use '/~user/.crypto/email/publickeys/eudora/' as an override of the default. But that would be exceptional.

Having standards that put things in standard places with standard names and formats makes intoperability and writing helper programs possible. 

Crypto is complicated and affects security. You know what else is complicated and affects security? Networking. Consider the difference in how the two work:

Networking:

Some expert discovers a security problem with some protocol, say 'talk'. I want to know if I have this at all, and if is is running. What is 'talk' anyway? Look at the standard list of services in /etc:

# grep talk /etc/services 
talk            517/tcp                         # like tenex link
talk            517/udp

Not REAL helpful, but something.
# cryptstat
-bash: cryptstat: command not found

# man talk

NAME
       talk - talk to another user

OK, fine, some sort of chat thing, port 517 service. Is it available? Is anyone running this?

# netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      

tcp        0      0 *:submission            *:*                     LISTEN     
tcp        0      0 *:http                  *:*                     LISTEN     
... 

nope, so will not worry about this for now.

Crypto:

Some expert discovers a security problem with some crypto method, say '3des'. I want to know if I have this at all, and if anyone is using it. What is '3des' anyway? Look at the standard list of crypto methods in  in /etc:

Oops, doesn't exist.

OK, well, try:
# cryptstat
-bash: cryptstat: command not found

# man 3des
No manual entry for 3des

# man des

des(3)                                OpenSSL                                des(3)

NAME
       DES_random_key, DES_set_key, DES_key_sched, DES_set_key_checked,
       DES_set_key_unchecked, DES_set_odd_parity, DES_is_weak_key, DES_ecb_encrypt,
       DES_ecb2_encrypt, DES_ecb3_encrypt, DES_ncbc_encrypt, DES_cfb_encrypt,
       DES_ofb_encrypt, DES_pcbc_encrypt, DES_cfb64_encrypt, DES_ofb64_encrypt,
       DES_xcbc_encrypt, DES_ede2_cbc_encrypt, DES_ede2_cfb64_encrypt,
       DES_ede2_ofb64_encrypt, DES_ede3_cbc_encrypt, DES_ede3_cbcm_encrypt,
       DES_ede3_cfb64_encrypt, DES_ede3_ofb64_encrypt, DES_cbc_cksum,
       DES_quad_cksum, DES_string_to_key, DES_string_to_2keys, DES_fcrypt,
       DES_crypt, DES_enc_read, DES_enc_write - DES encryption
DESCRIPTION
       This library contains a fast implementation of the DES encryption algorithm.

Well, thank you openSSL, at least. I infer it must exist on my system somewhere since I have a man page for it.
# cryptstat
-bash: cryptstat: command not found

Is anyone using it? Try a little wishful thinking...

# cryptstat
-bash: cryptstat: command not found

Oops, no such program. No way to easily tell if someone might be running a serious security hazard on my system.

Not only does 'cryptstat' not exist, but it would be nearly impossible to write one. It would have to know every single crypto program that MIGHT exist on the system, what their formats are, how to discover what is currently seleted for use.

IETF is all about standards and interoperability. It's time for some in this area.

> - how do people securely backup their keys?

They get backed up when they back up their system.

They can also use the functions mentioned above to make a 'standard' crypto environment file to share between friendly devices, which has all their own and friends public keys, and their own private keys. Put it on a disk somewhere safe.

In a multi-device environment, if a single device loses a disk or somethng, they can just use the 'export to friendly device' from any of the remaining good devices to restore everything.

> - how do people revoke keys when a device is stolen or otherwise
>   compromised?

I covered this previously - if your device is stolen or hacked, it is basically 'game over'. You need to use the functions that drop all your current private and public keys (to 'inactive' status), and create new ones, and refriend your email contacts that use encryption. Public key cryptography depends upon keeping your private key safe. I know of no way to change that.

As to 'revocation' - none needed (other than telling your friends to refriend you - the 'I was Hacked' menu item could possibly do that part automatically), because we are not using any public keyservers or Certificate Authorities external to our own envronment. There is nothing in public to 'revoke'.

I need to be very clear about what I am doing here by NOT using that stuff: I am deliberately sacrificing some security for usability.

The reasons for -all- that complicated keyservers and Certificate Authority stuff are 1. The need to have public keys available for anyone who asks (we do not need that since this is 'default deny' for all except our 'friends') and 2. The need to establish authentication - 'are we actually talking to who we think we are?'.

The need for an external authentication authority is to make sure there is not a 'man in the middle' of our transaction. Specifically, in the key exchange as I suggest it, someone COULD insert themselves in between us, get both public keys from us, and impersonate each of us to the other. So I would think I was emailing you my public key, but 'spook' in the middle actually gets it, and sends you a different key, which he also has the private key for. You think you got my key, you actually got his. He now gets an email from me, decodes it since I encoded it with HIS public key, recodes it with your public key which he has but you think only I have.

Protecting against this possibility causes an immense amount of extra complexity, which is one of the things that puts people off using cryptography.

The question is, 'While theoretically possible, how likely is this in real life'. My answer to that is: not very likely, unless you are specifically targeted by someone powerful enough to insert themselves into someone elses network. Most people are using large isps now, like ATT, Verizon, and they have direct connections to each other, so in actual reality this man in the middle has to have access to these large networks in a very deep way.

Who could do this?

A hacker? Maybe briefly, for a very small number of people. To do this to EVERYONE would take immense amounts of money, and for what gain? They would be pretty quickly found out. 

Verizon itself, perhaps for commercial reasons? To sell ads? The cost equation just does not work, it takes far too many resources for too little gain.

A foreign government? Maybe in specifically targeted cases. No practical return and pretty much impossible to do for everyone, there are simply far too many resoures needed, too much exposure, it would surely be found out quickly. 

Your own government? Most of what they do is more in the line of 'taps' to get information than man in the middle (with possible exception of https, in some situations). It does take a lot of resources, even for a govenment. But this has another problem in the case of email: it is very likely to be found out.

In the MITM setup I described above, remember that the man in the middle is fooling both sides by giving them the wrong keys. So what happens if you take your cell phone with you on vacation (to Russia, Brazil, Hong Kong, a place with a very small isp in the country...) and use another network to connect? Well, that network had better be MITM'd too , because if it is not, you and your friend will not be able to read each others email, because you both do not have each others keys, you have the man in the middle's keys. You will know by this that you are compromised.

This is also defeated by exchanging keys manually, or even by something so easy as checking through another channel, for example, call up your friend and tell him to start reading what he thinks is your public key out loud. It had better match what you see...

It makes little sense for a government to try to MITM every single possible path for every single person, in every possible circumstance, something that is not practically possible, to do something so easily found out, and of limited value.

Even if I went the other way, and forced everyone to use a complex system, buy personal certificates from a CA, what would be gained? Apparently they have the private keys of the CAs already, and can still game this.
Key-signing by multiple people as used for pgp still useful, and still can be used as desired. 

One thing I left out of the key exchange is that of course, while the initial emails are not encrypted, they should still be signed, and by the 'private' private key which can be later checked after the friend has obtained it. That may help some.

What the user gains from this is ease of use, less spam, privacy protection from most bad actors reading your mail, and protection from generic, automated, mass 'fishing expeditions' of the type that create a lot of false positives - so you don't get put on a 'watch list' for talking about pressure cookers. Or a couple actors for talking about 'making a bomb' after watching 'The Producers'.

This is all about 'reasonable privacy' not 'perfect security'. It is like deciding to have a private conversation with someone by walking outside your house. Yes, someone COULD be using a parbolic microphone from a half mile away to pick it up and record it. Still, I see no need to build a solid concrete soundproof blockhouse just to keep old Aunt Biddie from being shocked by what the young folk are talking about.

-Mike

From stephen.farrell@cs.tcd.ie  Mon Oct 14 16:41:57 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hi Steve,

On 10/14/2013 06:39 PM, Stephen Kent wrote:
> Stephen,
> ...
>> That's not an unreasonable answer. However, we do have to
>> face the fact that a lot of times MTI stuff is just not
>> used when you and I would probably argue that it really
>> ought be used. It also not unreasonable to say that doing
>> more-than-MTI won't fix that, but that's what I'd like
>> to explore here.
> This may be where we have a significant disagreement. 

Note that I've no espoused any particular more-than-MTI
position so its not yet clear how you and I disagree
(on this one:-)

> I am comfortable
> developing security/privacy mechanisms that users and providers may
> choose to employ, because compliant implementations will make it
> available in an
> interoperable fashion. Insisting that a set of such mechanisms be employed,
> seems beyond our remit.

I get that argument. But what's the difference between that
and saying "don't use MD5" really? We're comfortable with
the latter since MD5 is just broken for collisions. I don't
see why we shouldn't be equally comfortable in saying "don't
send cleartext" - *if* that's an IETF consensus position - as
we have seen sending cleartext is also just broken when one
consideres pervasive monitoring.

In fact I don't really believe there's a crystal clear line
between protocol and policy in many cases, I think its blurrier
than is claimed by those who argue against more-than-MTI as
being beyond our remit, as you do.

That doesn't by itself invalidate your basic position that MTI
is good enough of course, but personally I do think it means
that a more-than-MTI position could exist that is equally
as defensible as the status quo.

>> Good question. Without saying I "support" it, rtcweb does mandate more
>> than MTI for e.g. DTLS-SRTP - the current draft [1] says it MUST be
>> offered as the default. I think I'd maybe "support" it more if I
>> understood better what kind of key management will be behind that,
>> which I don't yet, but its a data point for what a lot of folks think
>> will be an important protocol that does take a more-than-MTI approach.
>> Maybe someone who knows more about that can explain the reasoning
>> behind that decision and whether they think it could or should be
>> generalised? Other examples could be good too, esp if they're actually
>> used and not just RFC 6919 text;-) S. [1]
>> http://tools.ietf.org/html/draft-ietf-rtcweb-security-arch-07#section-5.5
> 
> 6919's "MUST (but we know you won't) was motivated by security MUSTs in
> a wide range of
> docs. the RTCWEB doc isn't an RFC yet, so we'll have to see what
> happens.  Also, this is
> an arch doc. As the author of 4301, the IPsec arch doc, I can attest
> that very, very few
> implementation are compliant with all of it's MUSTs. Implementors tend
> to focus more on
> bits on the wire than on other protocol "features"

Its not like 4301 and that draft is I think nearing LC and code
that does this (again I think) has been deployed, possibly widely,
though I think I do recall some part where one of the popular
browsers doesn't do the DTLS thing for data channels or some
such, so I'm not claiming its a perfect example, but it is a
real one.  Again I'd be interested in hearing from folks who
were involved in that discussion or who know more about the
reality of rtcweb code and deployments.

But this is a real example where we are specifying more-than-MTI
for one important protocol already, I think that's unquestionable
frankly.

S.



> 
> Steve
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

From hallam@gmail.com  Mon Oct 14 19:57:37 2013
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From: Phillip Hallam-Baker <hallam@gmail.com>
To: Richard Barnes <rlb@ipv.sx>
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Cc: "Moriarty, Kathleen" <kathleen.moriarty@emc.com>, perpass <perpass@ietf.org>, Russ Housley <housley@vigilsec.com>
Subject: Re: [perpass] PKCS#12 needs fix'n
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On Fri, Oct 11, 2013 at 10:56 AM, Richard Barnes <rlb@ipv.sx> wrote:

> I would note that the JSON Web Key [1] spec from the JOSE WG provides a
> similar, much simpler format than PKCS#12.  Just have JWK Set with one
> public, unencrypted member, and one encrypted member:
>
> [
>   { "kty": "RSA", "n": "...", "e": "...", "x5c": "..." },
>   JWE({ "kty": "RSA", "n": "...", "e": "...", "d": "..." })
> ]
>
> Since software is going to have to change in any case to use a revised
> PKCS#12, I wonder if it might not be a better idea to ditch ASN.1 while
> we're at it.
>

Actually I had pretty much done that before making the post. I am actually
sending PKCS#8 encrypted keys to the cloud.

But there is a value in being able to return a PKCS#12 which is that
several programs and platforms will eat them as input and store the keys in
the desired places. So for that it is a legacy compatibility issue. And so
when I found the PKCS#12 docs to be basically unreadable, I had a problem.

As for getting rid of Assanine 1, I would love to get rid of it completely.
But as a pragmatic matter, there is just too much ASN.1 already. I have
even had to reluctantly write a key signing format in Assanine.1 because
having the cert and key signing in different syntaxes is just too confusing.



-- 
Website: http://hallambaker.com/

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Fri, Oct 11, 2013 at 10:56 AM, Richard Barnes <span dir=3D"ltr">=
&lt;<a href=3D"mailto:rlb@ipv.sx" target=3D"_blank">rlb@ipv.sx</a>&gt;</spa=
n> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr">I would note that the JSON =
Web Key [1] spec from the JOSE WG provides a similar, much simpler format t=
han PKCS#12. =A0Just have JWK Set with one public, unencrypted member, and =
one encrypted member:<div>
<br></div>
<div>[</div><div>=A0 { &quot;kty&quot;: &quot;RSA&quot;, &quot;n&quot;: &qu=
ot;...&quot;, &quot;e&quot;: &quot;...&quot;, &quot;x5c&quot;: &quot;...&qu=
ot; },</div><div>=A0 JWE({ &quot;kty&quot;: &quot;RSA&quot;, &quot;n&quot;:=
 &quot;...&quot;, &quot;e&quot;: &quot;...&quot;, &quot;d&quot;: &quot;...&=
quot; })</div>

<div>]</div><div><br></div><div>Since software is going to have to change i=
n any case to use a revised PKCS#12, I wonder if it might not be a better i=
dea to ditch ASN.1 while we&#39;re at it.</div></div></blockquote><div>
<br></div><div>Actually I had pretty much done that before making the post.=
 I am actually sending PKCS#8 encrypted keys to the cloud.=A0</div><div><br=
></div><div>But there is a value in being able to return a PKCS#12 which is=
 that several programs and platforms will eat them as input and store the k=
eys in the desired places. So for that it is a legacy compatibility issue. =
And so when I found the PKCS#12 docs to be basically unreadable, I had a pr=
oblem.</div>
<div><br></div><div>As for getting rid of Assanine 1, I would love to get r=
id of it completely. But as a pragmatic matter, there is just too much ASN.=
1 already. I have even had to reluctantly write a key signing format in Ass=
anine.1 because having the cert and key signing in different syntaxes is ju=
st too confusing.</div>
<div><br></div><div>=A0</div></div><div><br></div>-- <br>Website: <a href=
=3D"http://hallambaker.com/">http://hallambaker.com/</a><br>
</div></div>

--089e0160c36e00163104e8bebf5f--

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Subject: Re: [perpass] PKCS#12 needs fix'n
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On Oct 15, 2013 Phillip Hallam-Baker wrote:

> As for getting rid of Assanine 1, I would love to get rid of it
completely. But as
> a pragmatic matter, there is just too much ASN.1 already. I have even had
to
> reluctantly write a key signing format in Assanine.1 because having the
cert
> and key signing in different syntaxes is just too confusing.

While I do understand the reluctance for ASN.1, in an embedded environment I
really prefer it over text parsing and buffer duplication that is required
for JSON parsing..

Paul Bakker


From atlunde@panix.com  Tue Oct 15 03:17:22 2013
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Subject: [perpass]  sending data without side effects
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I'm not sure it directly does anything to improve resistance to 
monitoring or active man-in-the-middle attacks, but it seems like 
security properties of some protocols could be improved by better 
separation of code from data, making data formats that are finite, can 
be validated, and don't embed a Turning-complete programming language 
interpreter.

An implementation that doesn't depend on artifacts from all over the net 
is good too.

A HTTP client that doesn't embed JavaScript or DOM is potentially more 
secure, though more limited in scope. (DNS and TCP can still be attacked.)

Groups like OpenID connect seem to be engaged in reinventing SAML in 
JSON, I'm less concerned about JSON as such, as the likelihood it will 
be run in web browser's JavaScript/DOM environments.

XML is not without warts: external entities and the difficulty of 
validating XML signatures come to mind.

I don't know ASN.1 well enough to comment on its issues...


From stephen.farrell@cs.tcd.ie  Tue Oct 15 03:26:20 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Following up on my own point - not stylish but I think
in this case justified:-)

On 10/15/2013 12:41 AM, Stephen Farrell wrote:
> I don't
> see why we shouldn't be equally comfortable in saying "don't
> send cleartext" - *if* that's an IETF consensus position - as
> we have seen sending cleartext is also just broken when one
> consideres pervasive monitoring.

I guess this Washington Post story [1] that I saw this
morning would appear to provide a relevant example.

In that case, I would argue that the fact that cleartext
IMAP provides interop and is successful does imply that
some services somewhere will use that for large populations
that will inevitably (as we now know) be subject to
pervasive monitoring.

When the numbers involved ("500,000 buddylists and
inboxes" collected on a "representative day" for just
one agency) are at that scale, then it seems to me that
one can fairly describe that as a failure in protocol
design and not solely as a bad deployment choice.

With the 20-20 hindsight afforded, if IMAP were a new
protocol, would we be correct to only have TLS as MTI as
we currently do [2] or would the Internet be better
if we *only* had port 993 and had TLS as MTU perhaps
with anon DH or something (*) like that?

The latter approach is certainly now far more likely to
be tractable than it was in 2003 (when RFC3501 was done).
Maybe its time we do that.

Cheers,
S.

(*) Yes, there's a bit of arm-waving there since one
can validly argue that the TLS ciphersuite that's MTI
for 3501 is still just a bit too hard to deploy as
one is supposed to get a server cert that the UA can
verify, which implies some management overhead. So
something slightly more easily deployed (and hence
not quite 3501) might really be needed. But *how* to
do MTU stuff could be a protocol-specific debate to
have after we concluded we had consensus for
more-than-MTI in some form. (Which we don't, today.)
But of course, a new IMAP security BCP doesn't have
to wait either (hint, hint:-)

[1]
http://www.washingtonpost.com/world/national-security/nsa-collects-millions-of-e-mail-address-books-globally/2013/10/14/8e58b5be-34f9-11e3-80c6-7e6dd8d22d8f_story.html
[2] https://tools.ietf.org/html/rfc3501#section-11

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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 15, 2013, at 1:26 PM, Stephen Farrell <stephen.farrell@cs.tcd.ie>
 wrote:

>=20
> Following up on my own point - not stylish but I think
> in this case justified:-)
>=20
> On 10/15/2013 12:41 AM, Stephen Farrell wrote:
>> I don't
>> see why we shouldn't be equally comfortable in saying "don't
>> send cleartext" - *if* that's an IETF consensus position - as
>> we have seen sending cleartext is also just broken when one
>> consideres pervasive monitoring.
>=20
> I guess this Washington Post story [1] that I saw this
> morning would appear to provide a relevant example.
>=20
> In that case, I would argue that the fact that cleartext
> IMAP provides interop and is successful does imply that
> some services somewhere will use that for large populations
> that will inevitably (as we now know) be subject to
> pervasive monitoring.
>=20
> When the numbers involved ("500,000 buddylists and
> inboxes" collected on a "representative day" for just
> one agency) are at that scale, then it seems to me that
> one can fairly describe that as a failure in protocol
> design and not solely as a bad deployment choice.
>=20
> With the 20-20 hindsight afforded, if IMAP were a new
> protocol, would we be correct to only have TLS as MTI as
> we currently do [2] or would the Internet be better
> if we *only* had port 993 and had TLS as MTU perhaps
> with anon DH or something (*) like that?

But with anon-DH you're not making those large populations less subject to =
pervasive monitoring. You've only made it a bit more difficult, and not in =
a way that is significant to the adversaries we're talking about.=20

You would get them better security if they were doing TLS with mutual authe=
ntication, but that requires a lot of infrastructure, and you would hesitat=
e to mandate that even if IMAP was a new protocol. You added "perhaps with =
anon DH" because you know what response you would get if you had said inste=
ad "with mutual authentication and PFS".

Yoav



From stephen.farrell@cs.tcd.ie  Tue Oct 15 04:31:56 2013
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hiya,

On 10/15/2013 12:18 PM, Yoav Nir wrote:
> But with anon-DH you're not making those large populations less
> subject to pervasive monitoring. You've only made it a bit more
> difficult, and not in a way that is significant to the adversaries
> we're talking about.
> 
> You would get them better security if they were doing TLS with mutual
> authentication, but that requires a lot of infrastructure, and you
> would hesitate to mandate that even if IMAP was a new protocol. You
> added "perhaps with anon DH" because you know what response you would
> get if you had said instead "with mutual authentication and PFS".

In this case, it appears (but we don't know) that the
monitoring was done at a lower layer and a mitm would
arguably be more expensive and more detectable, so even
anon DH might help enough to get Yoav's inbox off the
list of those 500,000 getting snarfed each day.

But, that's really discussing the IMAP-specific "how
to mitigate" and the more interesting question I think
is whether we should regard this report as an existence
proof of a protocol design failure that's had the
spotlight shined on it a decade after 3501 was published,
or as a mere case of deployments that didn't do the
right thing.

S.

From derhoermi@gmx.net  Tue Oct 15 06:01:34 2013
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From: Bjoern Hoehrmann <derhoermi@gmx.net>
To: Albert Lunde <atlunde@panix.com>
Date: Tue, 15 Oct 2013 15:01:33 +0200
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Subject: Re: [perpass] sending data without side effects
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* Albert Lunde wrote:
>I'm not sure it directly does anything to improve resistance to 
>monitoring or active man-in-the-middle attacks, but it seems like 
>security properties of some protocols could be improved by better 
>separation of code from data, making data formats that are finite, can 
>be validated, and don't embed a Turning-complete programming language 
>interpreter.

That is indeed a popular demand, see <http://langsec.org/occupy>.
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

From hallam@gmail.com  Tue Oct 15 06:19:00 2013
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From: Phillip Hallam-Baker <hallam@gmail.com>
To: Paul Bakker <p.j.bakker@offspark.com>
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Subject: Re: [perpass] PKCS#12 needs fix'n
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On Tue, Oct 15, 2013 at 5:18 AM, Paul Bakker <p.j.bakker@offspark.com>wrote:

> On Oct 15, 2013 Phillip Hallam-Baker wrote:
>
> > As for getting rid of Assanine 1, I would love to get rid of it
> completely. But as
> > a pragmatic matter, there is just too much ASN.1 already. I have even had
> to
> > reluctantly write a key signing format in Assanine.1 because having the
> cert
> > and key signing in different syntaxes is just too confusing.
>
> While I do understand the reluctance for ASN.1, in an embedded environment
> I
> really prefer it over text parsing and buffer duplication that is required
> for JSON parsing..
>

There are real problems there for embedded apps and for cryptography. But
extending the JSON approach modestly to incorporate fixed length strings
and binary blobs solves 95% of them:

https://datatracker.ietf.org/doc/draft-hallambaker-jsonbcd/


Having to remember whether an object is implicit or explicit or vague is
just too much hassle.

-- 
Website: http://hallambaker.com/

--001a1133b2d05752b104e8c76d74
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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Tue, Oct 15, 2013 at 5:18 AM, Paul Bakker <span dir=3D"ltr">&lt;=
<a href=3D"mailto:p.j.bakker@offspark.com" target=3D"_blank">p.j.bakker@off=
spark.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div class=3D"im">On Oct 15, 2013 Phillip Hallam-Baker wro=
te:<br>

<br>
&gt; As for getting rid of Assanine 1, I would love to get rid of it<br>
completely. But as<br>
&gt; a pragmatic matter, there is just too much ASN.1 already. I have even =
had<br>
to<br>
&gt; reluctantly write a key signing format in Assanine.1 because having th=
e<br>
cert<br>
&gt; and key signing in different syntaxes is just too confusing.<br>
<br>
</div>While I do understand the reluctance for ASN.1, in an embedded enviro=
nment I<br>
really prefer it over text parsing and buffer duplication that is required<=
br>
for JSON parsing..<br></blockquote><div><br></div><div>There are real probl=
ems there for embedded apps and for cryptography. But extending the JSON ap=
proach modestly to incorporate fixed length strings and binary blobs solves=
 95% of them:</div>
<div><br></div><div><a href=3D"https://datatracker.ietf.org/doc/draft-halla=
mbaker-jsonbcd/">https://datatracker.ietf.org/doc/draft-hallambaker-jsonbcd=
/</a>=A0</div></div><div class=3D"gmail_extra"><br></div><div class=3D"gmai=
l_extra">
<br></div><div class=3D"gmail_extra">Having to remember whether an object i=
s implicit or explicit or vague is just too much hassle.</div><div><br></di=
v>-- <br>Website: <a href=3D"http://hallambaker.com/">http://hallambaker.co=
m/</a><br>

</div></div>

--001a1133b2d05752b104e8c76d74--

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From: Bjoern Hoehrmann <derhoermi@gmx.net>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Date: Tue, 15 Oct 2013 15:40:36 +0200
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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* Stephen Farrell wrote:
>Some folks (me included to be honest) wonder if the current
>situation argues for raising the bar there somewhat on the
>basis that MTI security features are frequently turned off
>or not sufficiently well tested to be usable. (Pick your
>favourite example, mine are usually rfc4744 or Diameter
>being run in clear.) And an upshot from that is that that
>helps those who want to pervasively monitor everything.
>
>Others argue that that'd be the IETF straying into the
>space of policy - all we should do is define how to use
>strong security features and make sure the code is there so
>they can be turned on and the rest is policy.

I need to monitor everything that comes in and out of my computer
systems and networks so I can detect exfiltrations and intrusions,
like when the latest operating system update comes with a helpful
default-on automatic cloud backup solution for my encryption keys,
or detailed information about nearby radio signals and microwaves
collected over prolonged periods of time by my smartphone. Lacking
a mandate to allow the user to effectively disable any "security"
mechanism would also help those who want to "pervasively monitor
everything", but "mandatory-to-use" digital repression mechanisms
are being deployed faster than I can track them. That would seem
to belong to this debate aswell.
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

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From: Ralf Skyper Kaiser <skyper@thc.org>
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Subject: [perpass] SSL/TLS and HTTPS in a Post-Prism Era
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Hi,

I created an incomplete summary of various reports about Certification
Authority breaches. I believe it is the most complete list to date
(additions welcome).

The summary also contains some (but not all) proposed security solutions
and enhancements for the 'CA Trust Problem' and some general security
enhancement for the deployment of SSL/TLS.

Comments and feedback are welcome.


https://thc.org/ssl


and a video parody to explain the problem to non-technical people:


http://youtu.be/F3BMA3IuvYs


Best Regards,

Ralf

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<div dir=3D"ltr">Hi,<br><br>I created an incomplete summary of various repo=
rts about Certification Authority breaches. I believe it is the most comple=
te list to date (additions welcome).<br><br>The summary also contains some =
(but not all) proposed security solutions and enhancements for the &#39;CA =
Trust Problem&#39; and some general security enhancement for the deployment=
 of SSL/TLS.<br>
<br>Comments and feedback are welcome.<br><br><br><a href=3D"https://thc.or=
g/ssl">https://thc.org/ssl</a><br><br><br>and a video parody to explain the=
 problem to non-technical people:<br><br><br><a href=3D"http://youtu.be/F3B=
MA3IuvYs">http://youtu.be/F3BMA3IuvYs</a><br>
<br><br>Best Regards,<br><br>Ralf<br></div>

--001a11c2036497c4da04e8c89b17--

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From: Tony Rutkowski <rutkowski.tony@gmail.com>
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References: <525475AA.2010907@cs.tcd.ie>	<525590CC.4030505@bbn.com>	<5255EC1D.5040006@cs.tcd.ie>	<5256F6CD.4090508@bbn.com>	<5256FB71.8040903@cs.tcd.ie>	<525722C4.4020408@bbn.com>	<5C28CCD5-4B7D-4BFB-94F4-1C33E43BDCD7@cdt.org>	<525BE7DC.4080407@gmail.com>	<95859161-25E3-45BC-A5C2-B3C548FB2417@acm.org>	<525C031B.5030100@bbn.com>	<525C2099.6010307@cs.tcd.ie>	<525C2C44.2070404@bbn.com> <525C8130.2000606@cs.tcd.ie> <525D183E.7000200@cs.tcd.ie>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Pardon the intervention, but when you scrape
some traitor's stolen material from Washington's
tabloid press as your use case, it is embarking far
into WTF territory.

The activity described in the material appears
not only to be perfectly legal, but consonant
with the fundamental purpose of the agencies
and communities involved.  It is consonant
with activities with a continuum over many
decades.  It is also essential to discovering
active planning designed to bring about
substantial harm to people and infrastructure.

One gets the feeling that if an Al-Shabaab IT
guy sent a Dear PERPASS email, asking if
the IETF could be its service bureau for secure
communications to plan its next mass killing
at a shopping centre, the answer would be
"sure enough" as we're concerned about your
privacy rights.

On 11 Sep 2001, as fate had it, I was on one
of the suspect planes in the air.  So perhaps
you can understand the interest in preventing
a similar event - which was coordinated via
Internet messages - as well as a certain
disdain for what seems to be ensuing here.

--tony


On 10/15/2013 6:26 AM, Stephen Farrell wrote:
> Following up on my own point - not stylish but I think
> in this case justified:-)
>
> On 10/15/2013 12:41 AM, Stephen Farrell wrote:
>> >I don't
>> >see why we shouldn't be equally comfortable in saying "don't
>> >send cleartext" -*if*  that's an IETF consensus position - as
>> >we have seen sending cleartext is also just broken when one
>> >consideres pervasive monitoring.
> I guess this Washington Post story [1] that I saw this
> morning would appear to provide a relevant example.


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    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
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  <body bgcolor="#FFFFFF" text="#000000">
    <div class="moz-cite-prefix">Pardon the intervention, but when you
      scrape<br>
      some traitor's stolen material from Washington's <br>
      tabloid press as your use case, it is embarking far <br>
      into WTF territory.<br>
      <br>
      The activity described in the material appears <br>
      not only to be perfectly legal, but consonant <br>
      with the fundamental purpose of the agencies <br>
      and communities involved.&nbsp; It is consonant <br>
      with activities with a continuum over many<br>
      decades.&nbsp; It is also essential to discovering <br>
      active planning designed to bring about<br>
      substantial harm to people and infrastructure.<br>
      <br>
      One gets the feeling that if an Al-Shabaab IT<br>
      guy sent a Dear PERPASS email, asking if<br>
      the IETF could be its service bureau for secure<br>
      communications to plan its next mass killing <br>
      at a shopping centre, the answer would be <br>
      "sure enough" as we're concerned about your <br>
      privacy rights.<br>
      <br>
      On 11 Sep 2001, as fate had it, I was on one<br>
      of the suspect planes in the air.&nbsp; So perhaps<br>
      you can understand the interest in preventing<br>
      a similar event - which was coordinated via<br>
      Internet messages - as well as a certain<br>
      disdain for what seems to be ensuing here.<br>
      <br>
      --tony<br>
      <br>
      <br>
      On 10/15/2013 6:26 AM, Stephen Farrell wrote:<br>
    </div>
    <blockquote cite="mid:525D183E.7000200@cs.tcd.ie" type="cite">
      <pre wrap="">Following up on my own point - not stylish but I think
in this case justified:-)

On 10/15/2013 12:41 AM, Stephen Farrell wrote:
</pre>
      <blockquote type="cite" style="color: #000000;">
        <pre wrap=""><span class="moz-txt-citetags">&gt; </span>I don't
<span class="moz-txt-citetags">&gt; </span>see why we shouldn't be equally comfortable in saying "don't
<span class="moz-txt-citetags">&gt; </span>send cleartext" - <b class="moz-txt-star"><span class="moz-txt-tag">*</span>if<span class="moz-txt-tag">*</span></b> that's an IETF consensus position - as
<span class="moz-txt-citetags">&gt; </span>we have seen sending cleartext is also just broken when one
<span class="moz-txt-citetags">&gt; </span>consideres pervasive monitoring.
</pre>
      </blockquote>
      <pre wrap="">I guess this Washington Post story [1] that I saw this
morning would appear to provide a relevant example.
</pre>
    </blockquote>
    <br>
  </body>
</html>

--------------080605010103070900020100--

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Subject: [perpass] Encoding email security policy into email addresses.
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One of the reasons that SSL works is that there is a convention that a
https: url is resolved over SSL transport. I have been thinking about
something similar for email.

Where I am at with the code at the moment is that I can generate keys and
throw them at a gateway to some PKI which is currently TBS. This allows
someone to configure their email client to accept encrypted email.

The hard part is how to decide whether the email should be encrypted and if
so under which key. As a pro-tem solution I plan to code up a simple
SMTP/SUBMIT proxy which the user points their outbound email at (using TLS
of course). This allows all the 'research stuff' to be isolated from the
email client.


One problem with this approach is that there is no way for the sender to
force use of encryption or to force encryption to a key validated under a
particular trust anchor.

Which had me thinking about a convention similar to https for email.


It turns out that the question mark is actually a valid RFC822 address and
is actually supported by a few MUAs. It is however rejected by plenty of
MTAs. Which is actually perfect for my purposes.

What I propose is the following:

?<user>@<domain>   : Force encryption of the email message

<key-identifier>?<user>@<domain>   : Force encryption of the email message
under a key that is chained under the specified <key-identifier>


The <key-identifier> here would be a base32 encoded one of the following:

* If it is 20 bytes, a PGP v4 sha1 fingerprint

* Otherwise, it a key identifier computed as a hash over the ASN.1 public
key info block that uses new, stronger hashes.


Note that this still requires the gateway to convert from either the email
address or the key identifier to a public key for encryption. But it does
place control in the hands of the user in a reasonably intelligible fashion
without needing to rewrite the email client.


An aware email client would of course have a handy button for this. But I
rather prefer it when the handy button is connected to something I can
relate to under the hood.


The key-identifier might specify the encryption key itself or there might
be a personal or enterprise hierarchy.

Consider the case that alice works for example.com.

Example Inc. has a corporate PKI and a key fingerprint X

alice@example.com has a personal key fingerprint Y which she has used to
endorse her email encryption key issued under the example.com PKI.


Depending on how well I know Alice and the nature of my message, I might
want to specify X or Y.

[I guess people might even want to allow for requiring the key to be
endorsed under X and Y]


Note that this approach still leaves open some research questions:

If the Key-Identifier is specified then we have a trust path Discovery
problem.

If the Key-Identifier is not specified then we have a trust path discovery
and validation problem.


-- 
Website: http://hallambaker.com/

--001a1135f79cb7e6d304e8c9276a
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>One of the reasons that SSL works is that there is a =
convention that a https: url is resolved over SSL transport. I have been th=
inking about something similar for email.</div><div><br></div><div>Where I =
am at with the code at the moment is that I can generate keys and throw the=
m at a gateway to some PKI which is currently TBS. This allows someone to c=
onfigure their email client to accept encrypted email.</div>
<div><br></div><div>The hard part is how to decide whether the email should=
 be encrypted and if so under which key. As a pro-tem solution I plan to co=
de up a simple SMTP/SUBMIT proxy which the user points their outbound email=
 at (using TLS of course). This allows all the &#39;research stuff&#39; to =
be isolated from the email client.=A0</div>
<div><br></div><div><br></div><div>One problem with this approach is that t=
here is no way for the sender to force use of encryption or to force encryp=
tion to a key validated under a particular trust anchor.</div><div><br>
</div><div>Which had me thinking about a convention similar to https for em=
ail.</div><div><br></div><div><br></div><div>It turns out that the question=
 mark is actually a valid RFC822 address and is actually supported by a few=
 MUAs. It is however rejected by plenty of MTAs. Which is actually perfect =
for my purposes.</div>
<div><br></div><div>What I propose is the following:</div><div><br></div><d=
iv>?&lt;user&gt;@&lt;domain&gt; =A0 : Force encryption of the email message=
</div><div><br></div><div>&lt;key-identifier&gt;?&lt;user&gt;@&lt;domain&gt=
; =A0 : Force encryption of the email message under a key that is chained u=
nder the specified &lt;key-identifier&gt;</div>
<div><br></div><div><br></div><div>The &lt;key-identifier&gt; here would be=
 a base32 encoded one of the following:</div><div><br></div><div>* If it is=
 20 bytes, a PGP v4 sha1 fingerprint=A0</div><div><br></div><div>* Otherwis=
e, it a key identifier computed as a hash over the ASN.1 public key info bl=
ock that uses new, stronger hashes.</div>
<div><br></div><div><br></div><div>Note that this still requires the gatewa=
y to convert from either the email address or the key identifier to a publi=
c key for encryption. But it does place control in the hands of the user in=
 a reasonably intelligible fashion without needing to rewrite the email cli=
ent.</div>
<div><br></div><div><br></div><div>An aware email client would of course ha=
ve a handy button for this. But I rather prefer it when the handy button is=
 connected to something I can relate to under the hood.</div><div><br></div=
>
<div><br></div><div>The key-identifier might specify the encryption key its=
elf or there might be a personal or enterprise hierarchy.</div><div><br></d=
iv>Consider the case that alice works for <a href=3D"http://example.com">ex=
ample.com</a>.<div>
<br></div><div>Example Inc. has a corporate PKI and a key fingerprint X</di=
v><div><br></div><div><a href=3D"mailto:alice@example.com">alice@example.co=
m</a> has a personal key fingerprint Y which she has used to endorse her em=
ail encryption key issued under the <a href=3D"http://example.com">example.=
com</a> PKI.</div>
<div><br></div><div><br></div><div>Depending on how well I know Alice and t=
he nature of my message, I might want to specify X or Y.</div><div><br></di=
v><div>[I guess people might even want to allow for requiring the key to be=
 endorsed under X and Y]</div>
<div><br></div><div><br></div><div>Note that this approach still leaves ope=
n some research questions:</div><div><br></div><div>If the Key-Identifier i=
s specified then we have a trust path Discovery problem.</div><div><br>
</div><div>If the Key-Identifier is not specified then we have a trust path=
 discovery and validation problem.</div><div><br clear=3D"all"><div><br></d=
iv>-- <br>Website: <a href=3D"http://hallambaker.com/">http://hallambaker.c=
om/</a><br>

</div></div>

--001a1135f79cb7e6d304e8c9276a--

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References: <525475AA.2010907@cs.tcd.ie> <525590CC.4030505@bbn.com> <5255EC1D.5040006@cs.tcd.ie> <5256F6CD.4090508@bbn.com> <5256FB71.8040903@cs.tcd.ie> <525722C4.4020408@bbn.com> <5C28CCD5-4B7D-4BFB-94F4-1C33E43BDCD7@cdt.org> <525BE7DC.4080407@gmail.com> <525BEAF4.5090802@cs.tcd.ie> <525BF0C2.8010201@gmail.com> <525BF51C.6090901@cs.tcd.ie>
Date: Tue, 15 Oct 2013 11:42:30 -0400
Message-ID: <CAMm+LwhRsn_Pr+DsHr8NS0bmagVDA2vMCc12g0uOhP9RXrEinA@mail.gmail.com>
From: Phillip Hallam-Baker <hallam@gmail.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Content-Type: multipart/alternative; boundary=089e01227ca4b6e39304e8c96eb2
Cc: perpass <perpass@ietf.org>, Alissa Cooper <acooper@cdt.org>, Stephen Kent <kent@bbn.com>, Tony Rutkowski <rutkowski.tony@gmail.com>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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--089e01227ca4b6e39304e8c96eb2
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On Mon, Oct 14, 2013 at 9:43 AM, Stephen Farrell
<stephen.farrell@cs.tcd.ie>wrote:

>
> Hiya,
>
> On 10/14/2013 02:25 PM, Tony Rutkowski wrote:
> > Hi Steve,
> >
> > The "that" clearly refers to the precedent sentence:
> >> Since the inception of messaging networks,
> >> governments and societies worldwide have
> >> instituted surveillance for all kinds of
> >> essential legitimate purposes - especially
>
> "all kinds of essential legitimate purposes" simply
> begs the question IMO.
>
> >> where the potential harm to people is great.
> > "Pervasive monitoring" seems an utterly meaningless
> > term used for political rhetoric/evangelical purposes
> > that isn't worth pursuing.  That should be a first order
> > conclusion.
>
> Personally, I entirely disagree. It is true that we
> don't have a worked out threat model for this yet,
> but Brian's draft is a start on which I hope we'll
> build so that protocol designers, implementers and
> those deploying networks and services will have a
> useful threat model to use when doing their work.
>
> > The point was that this is all about risk management.
>
> That's agreed. One reason for this list is that we have a
> new threat model that we've not considered when designing
> protocols. The risk analysis has been changed by
> recent revelations IMO. If you disagree, that's fine,
> but surprising.
>
> > However, if you or anyone else want to denominate
> > a religious abstraction as an "attack" - go for it. :-)
> > It'll be fun to watch.
>
> I'll take that rhetorical flourish as a lack of
> evidence then:-)
>
> And we're going way off topic for this thread, so
> please change the subject if you want to continue
> on this topic - its not really to do with MTI at
> all.
>
> Ta,
> S.
>
>
> >
> > --tony
> >
> >
> > On 10/14/2013 9:00 AM, Stephen Farrell wrote:
> >>
> >> On 10/14/2013 01:47 PM, Tony Rutkowski wrote:
> >>> Most citizens want that to continue because
> >>> the risks of not doing so are great.
> >> If the "that" above refers to pervasive monitoring,
> >> then please provide evidence (but please do so in
> >> another thread, I bet it'll not be conclusive
> >> enough that one mail will be convincing;-)
> >>
> >> If you are referring to tracking or surveillance
> >> of a specific set of targets, then a) that's irrelevant
> >> for this list/discussion which is about pervasive
> >> monitoring, and b) see RFC 2804.
> >>
> >> As an aside, its also misleading to speak of citizens
> >> here, since most of us are not citizens of the same
> >> country, for all values of country. So while it is
> >> important and relevant that different jurisdictions
> >> put in place policy/political controls on pervasive
> >> monitoring, those are also not relevant for this
> >> list since in general our protocols can be used
> >> across all possible jurisdictional boundaries.
> >>
> >>> So as many have opined, the IETF is a
> >>> technical standards body,
> >> Yes we are. And given that pervasive monitoring is
> >> in some ways indistinguishable from other forms of
> >> attack, we should treat those aspects as an attack
> >> and put in place the best technical mitigations we
> >> can.
> >>
> >> And as a reminder the question for this thread,
> >> is whether or not going further than MTI would help
> >> with that.
> >>
> >> S.
> >>
> >
> > _______________________________________________
> > perpass mailing list
> > perpass@ietf.org
> > https://www.ietf.org/mailman/listinfo/perpass
> >
> >
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>



-- 
Website: http://hallambaker.com/

--089e01227ca4b6e39304e8c96eb2
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<div dir=3D"ltr"><br></div><div class=3D"gmail_extra"><br><br><div class=3D=
"gmail_quote">On Mon, Oct 14, 2013 at 9:43 AM, Stephen Farrell <span dir=3D=
"ltr">&lt;<a href=3D"mailto:stephen.farrell@cs.tcd.ie" target=3D"_blank">st=
ephen.farrell@cs.tcd.ie</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><br>
Hiya,<br>
<div class=3D"im"><br>
On 10/14/2013 02:25 PM, Tony Rutkowski wrote:<br>
&gt; Hi Steve,<br>
&gt;<br>
&gt; The &quot;that&quot; clearly refers to the precedent sentence:<br>
&gt;&gt; Since the inception of messaging networks,<br>
&gt;&gt; governments and societies worldwide have<br>
&gt;&gt; instituted surveillance for all kinds of<br>
&gt;&gt; essential legitimate purposes - especially<br>
<br>
</div>&quot;all kinds of essential legitimate purposes&quot; simply<br>
begs the question IMO.<br>
<div class=3D"im"><br>
&gt;&gt; where the potential harm to people is great.<br>
&gt; &quot;Pervasive monitoring&quot; seems an utterly meaningless<br>
&gt; term used for political rhetoric/evangelical purposes<br>
&gt; that isn&#39;t worth pursuing. =A0That should be a first order<br>
&gt; conclusion.<br>
<br>
</div>Personally, I entirely disagree. It is true that we<br>
don&#39;t have a worked out threat model for this yet,<br>
but Brian&#39;s draft is a start on which I hope we&#39;ll<br>
build so that protocol designers, implementers and<br>
those deploying networks and services will have a<br>
useful threat model to use when doing their work.<br>
<div class=3D"im"><br>
&gt; The point was that this is all about risk management.<br>
<br>
</div>That&#39;s agreed. One reason for this list is that we have a<br>
new threat model that we&#39;ve not considered when designing<br>
protocols. The risk analysis has been changed by<br>
recent revelations IMO. If you disagree, that&#39;s fine,<br>
but surprising.<br>
<div class=3D"im"><br>
&gt; However, if you or anyone else want to denominate<br>
&gt; a religious abstraction as an &quot;attack&quot; - go for it. :-)<br>
&gt; It&#39;ll be fun to watch.<br>
<br>
</div>I&#39;ll take that rhetorical flourish as a lack of<br>
evidence then:-)<br>
<br>
And we&#39;re going way off topic for this thread, so<br>
please change the subject if you want to continue<br>
on this topic - its not really to do with MTI at<br>
all.<br>
<br>
Ta,<br>
<div class=3D"HOEnZb"><div class=3D"h5">S.<br>
<br>
<br>
&gt;<br>
&gt; --tony<br>
&gt;<br>
&gt;<br>
&gt; On 10/14/2013 9:00 AM, Stephen Farrell wrote:<br>
&gt;&gt;<br>
&gt;&gt; On 10/14/2013 01:47 PM, Tony Rutkowski wrote:<br>
&gt;&gt;&gt; Most citizens want that to continue because<br>
&gt;&gt;&gt; the risks of not doing so are great.<br>
&gt;&gt; If the &quot;that&quot; above refers to pervasive monitoring,<br>
&gt;&gt; then please provide evidence (but please do so in<br>
&gt;&gt; another thread, I bet it&#39;ll not be conclusive<br>
&gt;&gt; enough that one mail will be convincing;-)<br>
&gt;&gt;<br>
&gt;&gt; If you are referring to tracking or surveillance<br>
&gt;&gt; of a specific set of targets, then a) that&#39;s irrelevant<br>
&gt;&gt; for this list/discussion which is about pervasive<br>
&gt;&gt; monitoring, and b) see RFC 2804.<br>
&gt;&gt;<br>
&gt;&gt; As an aside, its also misleading to speak of citizens<br>
&gt;&gt; here, since most of us are not citizens of the same<br>
&gt;&gt; country, for all values of country. So while it is<br>
&gt;&gt; important and relevant that different jurisdictions<br>
&gt;&gt; put in place policy/political controls on pervasive<br>
&gt;&gt; monitoring, those are also not relevant for this<br>
&gt;&gt; list since in general our protocols can be used<br>
&gt;&gt; across all possible jurisdictional boundaries.<br>
&gt;&gt;<br>
&gt;&gt;&gt; So as many have opined, the IETF is a<br>
&gt;&gt;&gt; technical standards body,<br>
&gt;&gt; Yes we are. And given that pervasive monitoring is<br>
&gt;&gt; in some ways indistinguishable from other forms of<br>
&gt;&gt; attack, we should treat those aspects as an attack<br>
&gt;&gt; and put in place the best technical mitigations we<br>
&gt;&gt; can.<br>
&gt;&gt;<br>
&gt;&gt; And as a reminder the question for this thread,<br>
&gt;&gt; is whether or not going further than MTI would help<br>
&gt;&gt; with that.<br>
&gt;&gt;<br>
&gt;&gt; S.<br>
&gt;&gt;<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; perpass mailing list<br>
&gt; <a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_b=
lank">https://www.ietf.org/mailman/listinfo/perpass</a><br>
&gt;<br>
&gt;<br>
_______________________________________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/perpass</a><br>
</div></div></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>=
Website: <a href=3D"http://hallambaker.com/">http://hallambaker.com/</a><br=
>
</div>

--089e01227ca4b6e39304e8c96eb2--

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From: Phillip Hallam-Baker <hallam@gmail.com>
To: Tony Rutkowski <rutkowski.tony@gmail.com>
Content-Type: multipart/alternative; boundary=089e0122797af36a7f04e8c9f93b
Cc: perpass <perpass@ietf.org>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Tue, Oct 15, 2013 at 10:44 AM, Tony Rutkowski
<rutkowski.tony@gmail.com>wrote:

>  Pardon the intervention, but when you scrape
> some traitor's stolen material from Washington's
> tabloid press as your use case, it is embarking far
> into WTF territory.
>

One problem is that the traitor in question was employed by the NSA and was
able to operate undetected for several years.

We have seen the greatest breach of internal security in NSA history and
nobody has been held accountable at a senior level.


Organizations that do not hold themselves accountable get held accountable
through external means. In this case pervasive unaccountable surveillance
is going to be met with pervasive unaccountable encryption.

Of all the evils in the world, where does snuffing out democracies in
Chile, Iran, Brazil, Greece and the rest stand next to terrorism? Pinochet
alone murdered more people than all the terrorists of the 20th century did.
Where does starting an illegal war that causes a half million deaths stand?


This is an international organization.

Suggesting that we leave such matters to those in authority without
specifying which authorities makes a large set of assumptions that are
probably more apparent to those of us who are not US citizens.

You might think it improper for someone like me to question the decisions
of your government. I think it rather presumptuous for US citizens to
assume that control of the Internet should lie exclusively with their
government because none of the rest could ever be trusted.


-- 
Website: http://hallambaker.com/

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<div dir=3D"ltr">On Tue, Oct 15, 2013 at 10:44 AM, Tony Rutkowski <span dir=
=3D"ltr">&lt;<a href=3D"mailto:rutkowski.tony@gmail.com" target=3D"_blank">=
rutkowski.tony@gmail.com</a>&gt;</span> wrote:<br><div class=3D"gmail_extra=
"><div class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    <div>Pardon the intervention, but when you
      scrape<br>
      some traitor&#39;s stolen material from Washington&#39;s <br>
      tabloid press as your use case, it is embarking far <br>
      into WTF territory.<br></div></div></blockquote></div><div><br></div>=
<div>One problem is that the traitor in question was employed by the NSA an=
d was able to operate undetected for several years.</div><div><br></div>
<div>We have seen the greatest breach of internal security in NSA history a=
nd nobody has been held accountable at a senior level.</div><div><br></div>=
<div><br></div><div>Organizations that do not hold themselves accountable g=
et held accountable through external means. In this case pervasive unaccoun=
table surveillance is going to be met with pervasive unaccountable encrypti=
on.</div>
<div><br></div><div>Of all the evils in the world, where does snuffing out =
democracies in Chile, Iran, Brazil, Greece and the rest stand next to terro=
rism? Pinochet alone murdered more people than all the terrorists of the 20=
th century did. Where does starting an illegal war that causes a half milli=
on deaths stand?</div>
<div><br></div><div><br></div><div>This is an international organization.</=
div><div><br></div><div>Suggesting that we leave such matters to those in a=
uthority without specifying which authorities makes a large set of assumpti=
ons that are probably more apparent to those of us who are not US citizens.=
=A0</div>
<div><br></div><div>You might think it improper for someone like me to ques=
tion the decisions of your government. I think it rather presumptuous for U=
S citizens to assume that control of the Internet should lie exclusively wi=
th their government because none of the rest could ever be trusted.</div>
<div><br></div><div><br></div>-- <br>Website: <a href=3D"http://hallambaker=
.com/">http://hallambaker.com/</a><br>
</div></div>

--089e0122797af36a7f04e8c9f93b--

From stephen.farrell@cs.tcd.ie  Tue Oct 15 09:27:21 2013
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Date: Tue, 15 Oct 2013 17:25:56 +0100
From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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To: Phillip Hallam-Baker <hallam@gmail.com>,  Tony Rutkowski <rutkowski.tony@gmail.com>
References: <525475AA.2010907@cs.tcd.ie> <525590CC.4030505@bbn.com>	<5255EC1D.5040006@cs.tcd.ie> <5256F6CD.4090508@bbn.com>	<5256FB71.8040903@cs.tcd.ie> <525722C4.4020408@bbn.com>	<5C28CCD5-4B7D-4BFB-94F4-1C33E43BDCD7@cdt.org>	<525BE7DC.4080407@gmail.com>	<95859161-25E3-45BC-A5C2-B3C548FB2417@acm.org>	<525C031B.5030100@bbn.com> <525C2099.6010307@cs.tcd.ie>	<525C2C44.2070404@bbn.com> <525C8130.2000606@cs.tcd.ie>	<525D183E.7000200@cs.tcd.ie> <525D54EA.2070104@gmail.com> <CAMm+Lwg4Ppk8CQGKceyJaLuhjac1+iOk5V=MXKoGuAcSogg3dQ@mail.gmail.com>
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Tony, Phill, (and everyone else)

Please - this and Tony's last mail are inappropriate
for this list and probably any IETF list.

Please don't continue it further.

Thanks,
Stephen. (As list moderator)

On 10/15/2013 05:21 PM, Phillip Hallam-Baker wrote:
> On Tue, Oct 15, 2013 at 10:44 AM, Tony Rutkowski
> <rutkowski.tony@gmail.com>wrote:
> 
>>  Pardon the intervention, but when you scrape
>> some traitor's stolen material from Washington's
>> tabloid press as your use case, it is embarking far
>> into WTF territory.
>>
> 
> One problem is that the traitor in question was employed by the NSA and was
> able to operate undetected for several years.
> 
> We have seen the greatest breach of internal security in NSA history and
> nobody has been held accountable at a senior level.
> 
> 
> Organizations that do not hold themselves accountable get held accountable
> through external means. In this case pervasive unaccountable surveillance
> is going to be met with pervasive unaccountable encryption.
> 
> Of all the evils in the world, where does snuffing out democracies in
> Chile, Iran, Brazil, Greece and the rest stand next to terrorism? Pinochet
> alone murdered more people than all the terrorists of the 20th century did.
> Where does starting an illegal war that causes a half million deaths stand?
> 
> 
> This is an international organization.
> 
> Suggesting that we leave such matters to those in authority without
> specifying which authorities makes a large set of assumptions that are
> probably more apparent to those of us who are not US citizens.
> 
> You might think it improper for someone like me to question the decisions
> of your government. I think it rather presumptuous for US citizens to
> assume that control of the Internet should lie exclusively with their
> government because none of the rest could ever be trusted.
> 
> 
> 
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

From hallam@gmail.com  Tue Oct 15 10:26:49 2013
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--001a11c349329ed3be04e8cae3c7
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This is how the scheme works in practice.



Private Key Example

Alice uses a key generation tool to generate a public keypair. The public
parameters in hexadecimal are:

Modulus  :
 a4 11 df 43 4a 6b a1 3e 29 78 5e 65 3c 3e 77 71
 78 e5 be bf 1e aa cd 4b 07 94 78 05 c6 c8 06 52
 a6 32 ce 8d 31 88 43 f5 78 b4 17 03 99 b1 1b a4
 fc e9 82 ec d7 10 f2 56 f4 dc b8 0e e4 d2 e9 e8
 ad 90 41 e6 9a 65 ad 97 c3 a6 f4 49 51 b2 cb 98
 4c d9 19 ba b4 b6 06 7c 87 79 3f 30 01 fa 1d d9
 5c ad 94 f6 5e 09 2d 32 5f 1d f7 ce d2 f5 d1 68
 05 c6 95 2b 9a c3 f5 f4 8a f2 a1 a6 9d 7a de 93
Exponent :
 01 00 01

The Key Identifier is calculated using SHA512 and truncated to 224 bits to
produce the Key Identifier value. The Key Identifier in Base32 encoding is:

KeyIdentifier: ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA

An email sender may send email to Alice through a compliant gateway as
follows: alice@example.com Send email to Alice using encryption if and only
if an encryption key for Alice can be found and Alice has published the
email encryption policy 'encryption preferred' or stronger. ?
alice@example.com Send email to Alice using encryption if and only if an
encryption key for Alice can be found, otherwise report an error.
ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA?alice@example.com Send
email to Alice using encryption if and only if an encryption key for Alice
can be found that is directly endorsed under the specified key, otherwise
report an error. ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA??
alice@example.com Send email to Alice using encryption if and only if an
encryption key for Alice can be found that is (directly or indierectly)
endorsed under the specified key, otherwise report an error.

The key identifiers are 224 bits long plus an 8 bit prefix to specify the
algorithm. It might well be desirable to trim them back to 160 bits but
certainly no less than 128 bits.

Here is 160 bits:
AAAMDA-GF5JAP-IAH7P3A-DSAEYB-IAHMAFB?alice@example.com

Here is 128 bits:
ADAHSA-CSZLAG-AAHTZ2A-IFAF3PF?alice@example.com


The 128 bit key identifier might be strong enough for a personal key
identifier since the difficulty of finding a key that would match by brute
force would be 128 bits.

For an organizational key, there is a risk of the key being formed
maliciously so as to evade transparency requirements and so the longer
identifier is 'probably' necessary.

-- 
Website: http://hallambaker.com/

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Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">This is how the scheme works in practice.<div><br></div><d=
iv><br></div><div><div class=3D"gmail_extra"><br><h2>Private Key Example</h=
2>

<p>
Alice uses a key generation tool to generate a public keypair. The public
parameters in hexadecimal are:
</p>

<pre>Modulus  :=20
 a4 11 df 43 4a 6b a1 3e 29 78 5e 65 3c 3e 77 71
 78 e5 be bf 1e aa cd 4b 07 94 78 05 c6 c8 06 52
 a6 32 ce 8d 31 88 43 f5 78 b4 17 03 99 b1 1b a4
 fc e9 82 ec d7 10 f2 56 f4 dc b8 0e e4 d2 e9 e8
 ad 90 41 e6 9a 65 ad 97 c3 a6 f4 49 51 b2 cb 98
 4c d9 19 ba b4 b6 06 7c 87 79 3f 30 01 fa 1d d9
 5c ad 94 f6 5e 09 2d 32 5f 1d f7 ce d2 f5 d1 68
 05 c6 95 2b 9a c3 f5 f4 8a f2 a1 a6 9d 7a de 93
Exponent :
 01 00 01</pre>

The Key Identifier is calculated using SHA512 and truncated to 224 bits to
produce the Key Identifier value. The Key Identifier in Base32 encoding is:

<pre>KeyIdentifier: ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA
</pre>

An email sender may send email to Alice through a compliant gateway as
follows:

<dl>
<dt><a href=3D"mailto:alice@example.com">alice@example.com</a></dt><dt>
</dt><dd>Send email to Alice using encryption if and only if an encryption =
key=20
for Alice can be found and Alice has published the email encryption
policy &#39;encryption preferred&#39; or stronger.</dd><dd>
</dd><dt>?<a href=3D"mailto:alice@example.com">alice@example.com</a></dt><d=
t>
</dt><dd>Send email to Alice using encryption if and only if an encryption =
key=20
for Alice can be found, otherwise report an error.</dd><dd>
</dd><dt>ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA?<a href=3D"=
mailto:alice@example.com">alice@example.com</a></dt><dt>
</dt><dd>Send email to Alice using encryption if and only if an encryption =
key=20
for Alice can be found that is directly endorsed under the specified key,=
=20
otherwise report an error.</dd><dd>
</dd><dt>ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA??<a href=3D=
"mailto:alice@example.com">alice@example.com</a></dt><dt>
</dt><dd>Send email to Alice using encryption if and only if an encryption =
key=20
for Alice can be found that is (directly or indierectly) endorsed under=20
the specified key, otherwise report an error.</dd><dd>
</dd></dl><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra"><=
div>The key identifiers are 224 bits long plus an 8 bit prefix to specify t=
he algorithm. It might well be desirable to trim them back to 160 bits but =
certainly no less than 128 bits.</div>
<div><br></div><div>Here is 160 bits:</div><div>AAAMDA-GF5JAP-IAH7P3A-DSAEY=
B-IAHMAFB?<a href=3D"mailto:alice@example.com">alice@example.com</a></div><=
/div><div class=3D"gmail_extra"><br></div>Here is 128 bits:<br clear=3D"all=
">
<div>ADAHSA-CSZLAG-AAHTZ2A-IFAF3PF?<a href=3D"mailto:alice@example.com">ali=
ce@example.com</a><br></div><div><br></div><div><br></div><div>The 128 bit =
key identifier might be strong enough for a personal key identifier since t=
he difficulty of finding a key that would match by brute force would be 128=
 bits.</div>
<div><br></div><div>For an organizational key, there is a risk of the key b=
eing formed maliciously so as to evade transparency requirements and so the=
 longer identifier is &#39;probably&#39; necessary.</div><div><br></div>
-- <br>Website: <a href=3D"http://hallambaker.com/">http://hallambaker.com/=
</a><br>
</div></div></div>

--001a11c349329ed3be04e8cae3c7--

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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Jon,
> Would you agree though Steve that wearing seat belts is our best 
> current practice for safety, and that we (if we imagine ourselves car 
> designers) should explain to people how unsafe the roads are and that 
> they really should wear seat belts? Not everyone who builds cars might 
> feel like they need to take responsibility for explaining this, of 
> course, but some will.
Taking this analogy too far ...

Yes, I'd support a BCP that calls for wearing seat belts. I would object 
to a standard
for cars that prevents them from starting unless the driver and 
passenger seat belts
are fastened, and prevents them from being unbuckled until the car is 
shifted into "park."
> I don't want us to throw up our hands and say there's nothing to be 
> done to improve the situation because users don't understand security 
> and some deployments would resist it. Here in the IETF, our 
> responsibilities as participants differ from those of users and even 
> operators. We write standards. I think we need to write standards that 
> are clear about what people should do to be secure on the Internet as 
> we understand it.
There certainly are things that can be done to improve security, in 
terms of our standards. We
should explain to people what that MAY do (not MUST or SHOULD) to be 
more secure. We're neither
Internet police nor Internet nannies.
> Our understanding of the Internet has changed because of these 
> revelations, and what we need to do has to change as well. I agree 
> that we can't levy unrealistic mandates and hope for anything but our 
> own irrelevance. But let's not swing too far in the opposite direction 
> here either.
Competent security folks were not surprised by the technical 
capabilities that have been revealed.
It's obvious that one can gain access to tons of metadata with the 
assistance of service providers,
and that a first world country can (and would) analyze that data looking 
for bad guys.

Steve

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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Joel,
> On Oct 14, 2013, at 8:01 AM, Ralf Skyper Kaiser <skyper@thc.org> wrote:
>
>> Hi,
>>
>> I understand the goal of making life harder for state surveillance.
>> However, I am not willing (personally) to incur any degraded user experience,
>> premature cell phone battery depletion, etc in order to support this goal.
>> I suspect, but cannot prove, that most users would express similar feelings.
> the browser/CA transition from 1024 to 2048 bit certs is ongoing albiet done soon. That's a cost that everyone is paying for whether they know it or not… We therefore have an internet scale existence proof.
Which RFC mandated this? My guess is NONE.

This represents a decision by a set of CAs and browser vendors, external 
to the
IETF, to improve security. That's fine, but it is also not 
representative of many
of the suggested mechanisms that have been proposed on this list, by 
some folks.

Steve

From kent@bbn.com  Tue Oct 15 14:00:35 2013
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] threat model draft
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Brian,

...
> Although I don't represent the clarity or quality of the draft as anything other than -00, I also don't understand what's not clear here.
>
> For those who don't have 6973 open in front of them:
>
> "Surveillance is the observation or monitoring of an individual's communications or activities... [and] can be conducted by observers or eavesdroppers at any point along the communications path."
a reasonable definition, when we are focusing on cyberspace.
> The argument is that this definition is deficient, in that it presumes an individual target. The whole conceptual framework of surveillance as an activity presumes a target. Legal surveillance requires one in order to get the necessary documents signed by the necessary oversight authority. Illegal surveillance generally has one in mind because it's cheaper that way.
I would not interpret the definition that narrowly, just because it 
mentions an individual.
Surveillance directed against a class of individuals seems to fit here 
as well.
> (One could make a case that there are indiscriminate attacks by criminal networks, e.g. skimming keystrokes from compromised machines to search for credit-card numbers... while these are untargeted with respect to individual, they're also not really surveillance per 6973, in that it's specific types of data that's the goal of the eavesdropping, not the communication or the activity in general.)
I'd disagree here too. Grabbing keystrokes is one way to get a password 
or a credit card number
at the source, an alternative to wiretapping. The goal would be the same 
for an adversary, independent
of the means by which it is accomplished.
> "Pervasive surveillance" (to mangle the 6973 defintion) is "the observation or monitoring of all individuals' communications or activities."
I suspect that the Internet is too big even for NSA and its friends to 
observe _all_  individuals, so
this definition seems too narrow, in a different way.
> Removing the concept of targeting (even if targeting is done after the fact) changes the character of the activity, both in terms of its impact on the monitored individual(s) (and -- at the risk of getting too far from the engineering -- its impact on the civil society of which the monitored individuals are presumed to be members) and in terms of how the impact it has on protocol design.
I suspect that the sort of very widespread surveillance that we have 
been discussing is still
targeted, in a sense. It may target users of specific providers or 
specific web sites, either
because the folks performing surveillance believe those are good places 
to gather the data
of interest, or because those are places within their ability to 
surveil. (Remember the joke
abut the drunk looking for his car keys under the street lamp, not 
because he lost them
there, but because the light was better?)
> Specifically, in targetless surveillance, attempts not to become a target are meaningless. (Which goes back to someone's... I think it was Yoav's... stated desire to increase the cost of pervasive surveillance to the point that he dropped out of the target set, which captures nicely the level of sensitivity we have to infinite versus finite target sets.)
I understand Yoav's model, and it has a rational basis. However, I have 
concerns about increasing
the "cost" for all users of some service, to make it easier for Yoav to 
avoid being targeted. This
seems like an externalization of cost, not my favorite economic model.

Steve

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    Brian,<br>
    <br>
    ...
    <blockquote
      cite="mid:595F53A6-70BB-4E5D-B899-2BEEAC1DF0D8@tik.ee.ethz.ch"
      type="cite">
      <pre wrap="">
Although I don't represent the clarity or quality of the draft as anything other than -00, I also don't understand what's not clear here.

For those who don't have 6973 open in front of them:

"Surveillance is the observation or monitoring of an individual's communications or activities... [and] can be conducted by observers or eavesdroppers at any point along the communications path."</pre>
    </blockquote>
    a reasonable definition, when we are focusing on cyberspace. <br>
    <blockquote
      cite="mid:595F53A6-70BB-4E5D-B899-2BEEAC1DF0D8@tik.ee.ethz.ch"
      type="cite">
      <pre wrap="">The argument is that this definition is deficient, in that it presumes an individual target. The whole conceptual framework of surveillance as an activity presumes a target. Legal surveillance requires one in order to get the necessary documents signed by the necessary oversight authority. Illegal surveillance generally has one in mind because it's cheaper that way.</pre>
    </blockquote>
    I would not interpret the definition that narrowly, just because it
    mentions an individual.<br>
    Surveillance directed against a class of individuals seems to fit
    here as well.<br>
    <blockquote
      cite="mid:595F53A6-70BB-4E5D-B899-2BEEAC1DF0D8@tik.ee.ethz.ch"
      type="cite">
      <pre wrap="">
(One could make a case that there are indiscriminate attacks by criminal networks, e.g. skimming keystrokes from compromised machines to search for credit-card numbers... while these are untargeted with respect to individual, they're also not really surveillance per 6973, in that it's specific types of data that's the goal of the eavesdropping, not the communication or the activity in general.)</pre>
    </blockquote>
    I'd disagree here too. Grabbing keystrokes is one way to get a
    password or a credit card number<br>
    at the source, an alternative to wiretapping. The goal would be the
    same for an adversary, independent<br>
    of the means by which it is accomplished.<br>
    <blockquote
      cite="mid:595F53A6-70BB-4E5D-B899-2BEEAC1DF0D8@tik.ee.ethz.ch"
      type="cite">
      <pre wrap="">"Pervasive surveillance" (to mangle the 6973 defintion) is "the observation or monitoring of all individuals' communications or activities." </pre>
    </blockquote>
    I suspect that the Internet is too big even for NSA and its friends
    to observe <u>all</u>&nbsp; individuals, so<br>
    this definition seems too narrow, in a different way.<br>
    <blockquote
      cite="mid:595F53A6-70BB-4E5D-B899-2BEEAC1DF0D8@tik.ee.ethz.ch"
      type="cite">
      <pre wrap="">Removing the concept of targeting (even if targeting is done after the fact) changes the character of the activity, both in terms of its impact on the monitored individual(s) (and -- at the risk of getting too far from the engineering -- its impact on the civil society of which the monitored individuals are presumed to be members) and in terms of how the impact it has on protocol design. </pre>
    </blockquote>
    I suspect that the sort of very widespread surveillance that we have
    been discussing is still<br>
    targeted, in a sense. It may target users of specific providers or
    specific web sites, either<br>
    because the folks performing surveillance believe those are good
    places to gather the data<br>
    of interest, or because those are places within their ability to
    surveil. (Remember the joke<br>
    abut the drunk looking for his car keys under the street lamp, not
    because he lost them<br>
    there, but because the light was better?)<br>
    <blockquote
      cite="mid:595F53A6-70BB-4E5D-B899-2BEEAC1DF0D8@tik.ee.ethz.ch"
      type="cite">
      <pre wrap="">Specifically, in targetless surveillance, attempts not to become a target are meaningless. (Which goes back to someone's... I think it was Yoav's... stated desire to increase the cost of pervasive surveillance to the point that he dropped out of the target set, which captures nicely the level of sensitivity we have to infinite versus finite target sets.)
</pre>
    </blockquote>
    I understand Yoav's model, and it has a rational basis. However, I
    have concerns about increasing<br>
    the "cost" for all users of some service, to make it easier for Yoav
    to avoid being targeted. This<br>
    seems like an externalization of cost, not my favorite economic
    model.<br>
    <br>
    Steve<br>
  </body>
</html>

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 15, 2013, at 1:49 PM, Stephen Kent <kent@bbn.com> wrote:

> Joel,
>> On Oct 14, 2013, at 8:01 AM, Ralf Skyper Kaiser <skyper@thc.org> =
wrote:
>>=20
>>> Hi,
>>>=20
>>> I understand the goal of making life harder for state surveillance.
>>> However, I am not willing (personally) to incur any degraded user =
experience,
>>> premature cell phone battery depletion, etc in order to support this =
goal.
>>> I suspect, but cannot prove, that most users would express similar =
feelings.
>> the browser/CA transition from 1024 to 2048 bit certs is ongoing =
albiet done soon. That's a cost that everyone is paying for whether they =
know it or not=85 We therefore have an internet scale existence proof.
> Which RFC mandated this? My guess is NONE.
>=20

the recommendation comes from nist 800-131A and 800-57  I'd link to them =
if the nist website were up but it isn't.

> This represents a decision by a set of CAs and browser vendors, =
external to the
> IETF, to improve security.

I'm not particularly enamoured of the idea the the IETF is the sole or =
even principle arbiter of industry consensus, so lets assume that it =
isn't. Whether you want to pay the cpu consumption tax or not, there's =
enough industry consensus on the subject that you don't have a choice.

> That's fine, but it is also not representative of many
> of the suggested mechanisms that have been proposed on this list, by =
some folks.


> Steve
>=20


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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Steve,

On 10/15/2013 07:03 PM, Stephen Kent wrote:
> Competent security folks were not surprised by the technical
> capabilities that have been revealed.
> It's obvious that one can gain access to tons of metadata with the
> assistance of service providers,
> and that a first world country can (and would) analyze that data looking
> for bad guys.

Competent people have been surprised by the scale here.
The level of collusion and coercion was not obvious to
many.

>From their pre-shutdown reaction, NIST appear both to
be surprised and to think something non-obvious has
occurred and I'm sure you'd consider NIST's crypto
people as being competent.

I think your comment above subtly understates the
situation in a way that's just not credible.

The subtlety is nicely done though:-)

S.

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Hello,
> ...
>> This may be where we have a significant disagreement.
> Note that I've no espoused any particular more-than-MTI
> position so its not yet clear how you and I disagree
> (on this one:-)
I must have misunderstood your comments (on this one :-) )
> ...
> I get that argument. But what's the difference between that
> and saying "don't use MD5" really? We're comfortable with
> the latter since MD5 is just broken for collisions. I don't
> see why we shouldn't be equally comfortable in saying "don't
> send cleartext" - *if* that's an IETF consensus position - as
> we have seen sending cleartext is also just broken when one
> consideres pervasive monitoring.
Saying don't use a specific alg, because it's defective, is a mandate
within a context where users/providers have already decided to employ
a security mechanism. Saying"no cleartext" is a statement without that
context, and thus not analogous. Or, in a lighter analogy, in the first
case we know what kind of people we're talking about, and we're just
haggling over the algorithm ;-) .
> In fact I don't really believe there's a crystal clear line
> between protocol and policy in many cases, I think its blurrier
> than is claimed by those who argue against more-than-MTI as
> being beyond our remit, as you do.
There may some gray areas; when I asked Avri about this she demurred,
so we'll have to examine specific examples to make progress.
> That doesn't by itself invalidate your basic position that MTI
> is good enough of course, but personally I do think it means
> that a more-than-MTI position could exist that is equally
> as defensible as the status quo.
Again, we'll have to see what more-that-MIT positions are put
forth before we'll be able to resolve this speculation on both
of our parts.
> ...
> Its not like 4301 and that draft is I think nearing LC and code
> that does this (again I think) has been deployed, possibly widely,
> though I think I do recall some part where one of the popular
> browsers doesn't do the DTLS thing for data channels or some
> such, so I'm not claiming its a perfect example, but it is a
> real one.  Again I'd be interested in hearing from folks who
> were involved in that discussion or who know more about the
> reality of rtcweb code and deployments.
In the RTCWEB case is the difference that  "a major browser vendor" has
decided its good, so it's a done deal? Frankly I've become concerned, 
recently,
that one major browser vendor has become very pushy about its ideas of 
what is
best for everyone. Because that vendor also is an OS vendor, it's
influence seems outsized, to me. But that's a different rant.
> But this is a real example where we are specifying more-than-MTI
> for one important protocol already, I think that's unquestionable
> frankly.
OK, and frankly, I think this is a questionable idea.

I just skimmed the I-D in question. It has over 80 MUSTs. Given the 
rather poor
track record of browsers wrt security,I am amazed to see the following 
text, in Section 3:

    The basic assumption of this architecture is that network resources
    exist in a hierarchy of trust, rooted in the browser, which serves as
    the user's TRUSTED COMPUTING BASE (TCB).

I suspect that most IETF participants are not familiar with the term TCB 
(and
there is no cite in the I-D), so they do not realize how odd this 
statement seems
to those of who are familiar with the term.

I have a lot of respect for Eric, but ...

Steve



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On 10/15/2013 10:21 PM, Stephen Kent wrote:
>>
> Again, we'll have to see what more-that-MIT positions are put
> forth before we'll be able to resolve this speculation on both
> of our parts.

Fully agree. Brian Carpenter mentioned one in an earlier
mail (on-by-default with an option to turn off) but we've
not seen others proposed so far.

S.

From trammell@tik.ee.ethz.ch  Tue Oct 15 14:45:04 2013
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hi, Stephens,

+1 (again) to MaD (mandatory as default); I've been following the thread =
and trying to thing of an MTU mechanism that is meaningful in an IETF =
context. Unfortunately for that, that we've done a reasonably good job =
of layering security -- making it simple to integrate in makes it simple =
to separate out as well.

I really think the best we can do is MaD with guidance for usage that =
enumerates specific, limited cases in which it makes sense to turn off.

Cheers,

(another) Brian

On Oct 15, 2013, at 11:28 PM, Stephen Farrell =
<stephen.farrell@cs.tcd.ie> wrote:

>=20
>=20
> On 10/15/2013 10:21 PM, Stephen Kent wrote:
>>>=20
>> Again, we'll have to see what more-that-MIT positions are put
>> forth before we'll be able to resolve this speculation on both
>> of our parts.
>=20
> Fully agree. Brian Carpenter mentioned one in an earlier
> mail (on-by-default with an option to turn off) but we've
> not seen others proposed so far.
>=20
> S.
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Joel,

Thanks for the quick reply.
...
>> Which RFC mandated this? My guess is NONE.
>>
> the recommendation comes from nist 800-131A and 800-57  I'd link to them if the nist website were up but it isn't.
OK, then, as I suspected, this is not the result of any RFC.

> I'm not particularly enamoured of the idea the the IETF is the sole or 
> even principle arbiter of industry consensus, so lets assume that it 
> isn't. Whether you want to pay the cpu consumption tax or not, there's 
> enough industry consensus on the subject that you don't have a choice.
I agree that the IETF is not an arbiter of industry consensus. The 
question being debated on this
list is whether it ought to become more of an arbiter of what users and 
service providers do,
by mandating use of security mechanisms, vs. just offering specs for 
interoperable mechanisms.

BTW, who got to form the industry consensus this time? How many folks, 
and in what venue?

Steve



From kent@bbn.com  Tue Oct 15 14:56:39 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Stephen,
> Steve,
>
> On 10/15/2013 07:03 PM, Stephen Kent wrote:
>> Competent security folks were not surprised by the technical
>> capabilities that have been revealed.
>> It's obvious that one can gain access to tons of metadata with the
>> assistance of service providers,
>> and that a first world country can (and would) analyze that data looking
>> for bad guys.
> Competent people have been surprised by the scale here.
> The level of collusion and coercion was not obvious to
> many.
I was not addressing the level and scale of collusion.
I was noting that the vulnerability was always obvious,
and if one was concerned about the confidentiality of metadata, ...
> >From their pre-shutdown reaction, NIST appear both to
> be surprised and to think something non-obvious has
> occurred and I'm sure you'd consider NIST's crypto
> people as being competent.
>
> I think your comment above subtly understates the
> situation in a way that's just not credible.
>
> The subtlety is nicely done though:-)
The comment about NIST was not from me, although I
too admire subtlety in such contexts.

Steve


From ned+perpass@mrochek.com  Tue Oct 15 14:57:26 2013
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To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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> Following up on my own point - not stylish but I think
> in this case justified:-)

> On 10/15/2013 12:41 AM, Stephen Farrell wrote:
> > I don't
> > see why we shouldn't be equally comfortable in saying "don't
> > send cleartext" - *if* that's an IETF consensus position - as
> > we have seen sending cleartext is also just broken when one
> > consideres pervasive monitoring.

> I guess this Washington Post story [1] that I saw this
> morning would appear to provide a relevant example.

> In that case, I would argue that the fact that cleartext
> IMAP provides interop and is successful does imply that
> some services somewhere will use that for large populations
> that will inevitably (as we now know) be subject to
> pervasive monitoring.

What is this "cleartext IMAP" of which you speak? A quick check of some of the
major US MSPs shows that Gmail, Hotmail, and Apple all require SSL/TLS for
IMAP. And AOL definitely offers SSL/TLS support, but I can't tell if they
require it or not.

Now, it seems to me like I'm missing one ... it's on the tip of my tongue ...
oh yeah, that would be Yahoo, the only vendor actually mentioned by name in the
Powerpoint slides the Washington Post story you cite is based on. But lo and
behold, they also require SSL for all IMAP access!

I haven't bothered to survey ISPs (although I will note that Verizon and
several others only offers POP, not IMAP, and yes, they do offer SSL with
that), but my sense is most of them support SSL/TLS and many even require it.

But don't for a moment think this is due to anyone caring deeply about privacy.
This is about support costs, specifically, the costs that accrue when someone's
account password is compromised, as it easily can be when using any of the
email protocols from, say, a wireless hotspot. SSL/TLS covering an AUTH
PLAIN/LOGIN exchange is the method of choice for addressing this problem, and
you end up getting SSL/TLS for the rest of the session for free when you do
that.

And before the IETF spends any time patting itself on the back here, I'll also
point out that almost all secure IMAP is imaps on port 993. IETF specifications
call for STARTTLS on the regular IMAP port (143). I also doubt that the
supported ciphersuites conforms all that well to IETF guidelines.

> When the numbers involved ("500,000 buddylists and
> inboxes" collected on a "representative day" for just
> one agency) are at that scale, then it seems to me that
> one can fairly describe that as a failure in protocol
> design and not solely as a bad deployment choice.

And again I have to ask: What is the "protocol design failure" of which you
speak? I'm especially interested in the one the IETF has made that exposes
buddy lists and address books.

In case you weren't aware, IMAP does not handle address book information or
buddy lists. It's just not part of the protocol, unless you do something quite
outre like storing your address book as a special message in a special folder.

The IETF protocol that does do part of this is carddav, but it's a relative
newcomer on the scene, and while many MSPs, including Yahoo, support it, I
see no indication that it's involved here.

Rather, this all looks to me like it has a lot more to do with web access
to mail and IM, to the point where I'm skeptical that access to cleartext
IMAP is a significant factor. (There is a slide at the end about IMAP,
but it's oddly disconnected from the rest of the presentation, and seems
like something added as an afterthought.)

Something else not mentioned on the slides is ActiveSync. AFAIK ActiveSync is
the biggest player in the address book and calendar access protocol space right
now. And there may well be security issues in it. But since it's a Microsoft
creation, it's going to be tough for the IETF to do anything about any problems
it has.

> With the 20-20 hindsight afforded, if IMAP were a new
> protocol, would we be correct to only have TLS as MTI as
> we currently do [2] or would the Internet be better
> if we *only* had port 993 and had TLS as MTU perhaps
> with anon DH or something (*) like that?

No, what 20-20 hindsight actually reveals is that when you fail to respond to
market needs, in particular the needs of mobile devices, in a timely and
appropriate way, alternatives to your protocols crop up that you have no
control over. And when those alternatives have security issues there's not all
that much you can do about it.

> The latter approach is certainly now far more likely to
> be tractable than it was in 2003 (when RFC3501 was done).
> Maybe its time we do that.

> Cheers,
> S.

> (*) Yes, there's a bit of arm-waving there since one
> can validly argue that the TLS ciphersuite that's MTI
> for 3501 is still just a bit too hard to deploy as
> one is supposed to get a server cert that the UA can
> verify, which implies some management overhead. So
> something slightly more easily deployed (and hence
> not quite 3501) might really be needed. But *how* to
> do MTU stuff could be a protocol-specific debate to
> have after we concluded we had consensus for
> more-than-MTI in some form. (Which we don't, today.)
> But of course, a new IMAP security BCP doesn't have
> to wait either (hint, hint:-)

... And that's a strawman. I've not heard and provider of any size make such an
argument in many, many, many years. The fact of the matter is that secure IMAP
*is* widely and successfully deployed, albeit in a way that the IETF did not
intend and in spite of the fact that the IETF did bugger-all to make it easy to
do. And since only yesterday I was listening to a presentation that among other
things covered the specifics of how a provider with 10s of millions of users
handles this particular problem, I can state with some authority that the costs
aren't that big a deal.

But if you really think it's worth spending the time to make IMAP security even
better, that's fine with me. But the work needs to be based on what's in play
in the real world, which seems markedly at odds with what you imagine is out
there. It also needs to be informed by what's actually possible given real
world constraints, e.g., what ciphersuites are actually offered by the SSL/TLS
libraries in common use. (I've heard it mooted that support for anon-DH in
particular is likely to be dropped from some of them.) And finally,
expectations as to what this will actually accomoplish in terms of thwaring
pervasive surveilance need to be lowered pretty dramatically.

But more generally - and I'm afraid I'm going to be a bit unkind here - there's
way too much yacketing about non-issues and completely impractical
non-solutions going on here, at least when it comes to securing the
bulk of present-day email.

So I'm once again going to ask, "What's the goal here?". If the goal is to make
the email of select group of cognescenti more secure that's one thing. It's
quite another to talk seriously about improving email security for everyone
else.

If we're going to do the latter, I'm afraid that needs to start with a better
understanding of what present-day email service actually looks like and where
market trends are pushing it. 

				Ned

From davieseb@scss.tcd.ie  Tue Oct 15 15:05:01 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Tue, 2013-10-15 at 14:03 -0400, Stephen Kent wrote:

> Yes, I'd support a BCP that calls for wearing seat belts. I would object 
> to a standard
> for cars that prevents them from starting unless the driver and 
> passenger seat belts
> are fastened, and prevents them from being unbuckled until the car is 
> shifted into "park."
I observe that the car designers have gone quite a way down this path.
Today's default seems to be irritating and unsilenceable audio alarms
triggered when you drive off without belting up.

I agree that I don't think we would want to go that way with email even
if there was an equivalent to this analogy.

However the automatic (person strangling) seat belt seems to have had a
brief outing and disappeared again - or maybe I haven't driven the right
US cars recently. 

/Elwyn  



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Cc: perpass <perpass@ietf.org>, Tim Moses <tim.moses@entrust.com>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 15, 2013, at 2:52 PM, Stephen Kent <kent@bbn.com> wrote:

> Joel,
>=20
> Thanks for the quick reply.
> ...
>>> Which RFC mandated this? My guess is NONE.
>>>=20
>> the recommendation comes from nist 800-131A and 800-57  I'd link to =
them if the nist website were up but it isn't.
> OK, then, as I suspected, this is not the result of any RFC.
>=20
>> I'm not particularly enamoured of the idea the the IETF is the sole =
or even principle arbiter of industry consensus, so lets assume that it =
isn't. Whether you want to pay the cpu consumption tax or not, there's =
enough industry consensus on the subject that you don't have a choice.
> I agree that the IETF is not an arbiter of industry consensus. The =
question being debated on this
> list is whether it ought to become more of an arbiter of what users =
and service providers do,
> by mandating use of security mechanisms, vs. just offering specs for =
interoperable mechanisms.
>=20
> BTW, who got to form the industry consensus this time? How many folks, =
and in what venue?

I belive the vehicle for coordination that was the ca/b forum

www.cabforum.org

Tim Moses who is one of the wpkops co-chairs is also the chair of that =
iirc so I would defer to an expert there.

>=20
> Steve
>=20
>=20


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From stephen.farrell@cs.tcd.ie  Tue Oct 15 17:31:16 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hiya,

Many snippets below...

On 10/15/2013 07:13 PM, ned+perpass@mrochek.com wrote:
>> Following up on my own point - not stylish but I think
>> in this case justified:-)
> 
>> On 10/15/2013 12:41 AM, Stephen Farrell wrote:
>>> I don't
>>> see why we shouldn't be equally comfortable in saying "don't
>>> send cleartext" - *if* that's an IETF consensus position - as
>>> we have seen sending cleartext is also just broken when one
>>> consideres pervasive monitoring.
> 
>> I guess this Washington Post story [1] that I saw this
>> morning would appear to provide a relevant example.
> 
>> In that case, I would argue that the fact that cleartext
>> IMAP provides interop and is successful does imply that
>> some services somewhere will use that for large populations
>> that will inevitably (as we now know) be subject to
>> pervasive monitoring.
> 
> What is this "cleartext IMAP" of which you speak? 

I guess that's a fair comment - we don't know that they're
able gather to inbox data via IMAP due to it being sent in
clear,  however that seems like a reasonable guess based
on the newspaper story which says that collection is done
by telcos that are "overseas" and assuming that TLS is not
busted for these services. (Even were TLS busted for those
services though, I don't think that changes so much of the
analysis *if* one can separately mitigate whatever's gone
wrong with those TLS deployments.)

But yes, that's guessing and we need to keep that in mind
and there could well be alternative explanations.

> A quick check of some of the
> major US MSPs shows that Gmail, Hotmail, and Apple all require SSL/TLS for
> IMAP. And AOL definitely offers SSL/TLS support, but I can't tell if they
> require it or not.
> 
> Now, it seems to me like I'm missing one ... it's on the tip of my tongue ...
> oh yeah, that would be Yahoo, the only vendor actually mentioned by name in the
> Powerpoint slides the Washington Post story you cite is based on. But lo and
> behold, they also require SSL for all IMAP access!
> 
> I haven't bothered to survey ISPs (although I will note that Verizon and
> several others only offers POP, not IMAP, and yes, they do offer SSL with
> that), but my sense is most of them support SSL/TLS and many even require it.

Is there publicly available information about the deployment of IMAP
in terms of how many servers/services allow or disallow cleartext,
STARTTLS or 993? (To expose my ignorance, yes, I did assume that many
services still allow IMAP over 143 without STARTTLS in addition to
993.)

> But don't for a moment think this is due to anyone caring deeply about privacy.
> This is about support costs, specifically, the costs that accrue when someone's
> account password is compromised, as it easily can be when using any of the
> email protocols from, say, a wireless hotspot. SSL/TLS covering an AUTH
> PLAIN/LOGIN exchange is the method of choice for addressing this problem, and
> you end up getting SSL/TLS for the rest of the session for free when you do
> that.

Sure.

> And before the IETF spends any time patting itself on the back here, I'll also
> point out that almost all secure IMAP is imaps on port 993. IETF specifications
> call for STARTTLS on the regular IMAP port (143). 

Rught. An important point I think.

> I also doubt that the
> supported ciphersuites conforms all that well to IETF guidelines.

Again, any information on what's available & what's used (if its
basically the same set of libraries as used for HTTP that's
probably known).

> 
>> When the numbers involved ("500,000 buddylists and
>> inboxes" collected on a "representative day" for just
>> one agency) are at that scale, then it seems to me that
>> one can fairly describe that as a failure in protocol
>> design and not solely as a bad deployment choice.
> 
> And again I have to ask: What is the "protocol design failure" of which you
> speak? 

Basically, having three flavours of IMAP (clear, STARTTLS and 993)
where one that just mandated use of TLS could arguably be simpler
and more secure. And note - I'm not saying this should've been
done years ago, I'm asking if in a similar situation today we
ought go for the one-with-security or the 3-flavoured approach.

(Ignoring the rest of the message and just dealing with that
would be fine from my pov if that helps.)

> I'm especially interested in the one the IETF has made that exposes
> buddy lists and address books.

Address books? When did I mention those? I don't believe I did and
if I did then that was in error. The buddylists things in the slides
are also presumably not IMAP related.

> 
> In case you weren't aware, IMAP does not handle address book information or
> buddy lists. It's just not part of the protocol, unless you do something quite
> outre like storing your address book as a special message in a special folder.
> 
> The IETF protocol that does do part of this is carddav, but it's a relative
> newcomer on the scene, and while many MSPs, including Yahoo, support it, I
> see no indication that it's involved here.
> 
> Rather, this all looks to me like it has a lot more to do with web access
> to mail and IM, to the point where I'm skeptical that access to cleartext
> IMAP is a significant factor. (There is a slide at the end about IMAP,
> but it's oddly disconnected from the rest of the presentation, and seems
> like something added as an afterthought.)
> 
> Something else not mentioned on the slides is ActiveSync. AFAIK ActiveSync is
> the biggest player in the address book and calendar access protocol space right
> now. And there may well be security issues in it. But since it's a Microsoft
> creation, it's going to be tough for the IETF to do anything about any problems
> it has.

Yeah, address books would be different, but again I don't
believe I even used that term in this discussion.

> 
>> With the 20-20 hindsight afforded, if IMAP were a new
>> protocol, would we be correct to only have TLS as MTI as
>> we currently do [2] or would the Internet be better
>> if we *only* had port 993 and had TLS as MTU perhaps
>> with anon DH or something (*) like that?
> 
> No, what 20-20 hindsight actually reveals is that when you fail to respond to
> market needs, in particular the needs of mobile devices, in a timely and
> appropriate way, alternatives to your protocols crop up that you have no
> control over. And when those alternatives have security issues there's not all
> that much you can do about it.

Hmmm. That may be true. But I don't think you answered
the question, except with the first word and then I'm
not sure if that's an answer or disagreeing with the
question.

Lemme try another way: if IMAP were a brand new protocol
today and given today's kit and network and what we've
learned, would we argue to define both an insecure and
a secure (but maybe not much used) variant or would we
be better off only defining one version that builds in
whatever we think is the right set of securiy features
and ensures that those are used (by not having the
option to not use 'em)?

> 
>> The latter approach is certainly now far more likely to
>> be tractable than it was in 2003 (when RFC3501 was done).
>> Maybe its time we do that.
> 
>> Cheers,
>> S.
> 
>> (*) Yes, there's a bit of arm-waving there since one
>> can validly argue that the TLS ciphersuite that's MTI
>> for 3501 is still just a bit too hard to deploy as
>> one is supposed to get a server cert that the UA can
>> verify, which implies some management overhead. So
>> something slightly more easily deployed (and hence
>> not quite 3501) might really be needed. But *how* to
>> do MTU stuff could be a protocol-specific debate to
>> have after we concluded we had consensus for
>> more-than-MTI in some form. (Which we don't, today.)
>> But of course, a new IMAP security BCP doesn't have
>> to wait either (hint, hint:-)
> 
> ... And that's a strawman. I've not heard and provider of any size make such an
> argument in many, many, many years. The fact of the matter is that secure IMAP
> *is* widely and successfully deployed, albeit in a way that the IETF did not
> intend and in spite of the fact that the IETF did bugger-all to make it easy to
> do. 

Yes - I think that supports my argument - the existence of a
"pretend" security variant at day zero is damaging so we should
ask whether we ought just make the security mandatory to use
and end up with one version.

> And since only yesterday I was listening to a presentation that among other
> things covered the specifics of how a provider with 10s of millions of users
> handles this particular problem, I can state with some authority that the costs
> aren't that big a deal.

I don't get what you mean there.

> 
> But if you really think it's worth spending the time to make IMAP security even
> better, that's fine with me. But the work needs to be based on what's in play
> in the real world, which seems markedly at odds with what you imagine is out
> there. 

Disagree. But that (I hope) is because you misinterpreted what
I'm asking/saying.

> It also needs to be informed by what's actually possible given real
> world constraints, e.g., what ciphersuites are actually offered by the SSL/TLS
> libraries in common use. 

Yeah. There're similar issues for TLS in general.

> (I've heard it mooted that support for anon-DH in
> particular is likely to be dropped from some of them.) 

That's fair. I did acknowledge arm-waving though.

> And finally,
> expectations as to what this will actually accomoplish in terms of thwaring
> pervasive surveilance need to be lowered pretty dramatically.

Why? And even if so, it may be worth doing as proection
against other bad actors.

> But more generally - and I'm afraid I'm going to be a bit unkind here - there's
> way too much yacketing about non-issues and completely impractical
> non-solutions going on here, at least when it comes to securing the
> bulk of present-day email.

I think that's not unkind but is unfair. (Given that I think
you yacketed about address books above for example.)

> So I'm once again going to ask, "What's the goal here?". If the goal is to make
> the email of select group of cognescenti more secure that's one thing. It's
> quite another to talk seriously about improving email security for everyone
> else.
> 
> If we're going to do the latter, I'm afraid that needs to start with a better
> understanding of what present-day email service actually looks like and where
> market trends are pushing it. 

Better understanding is always good and the main goal here (at least
mine) is to make pervasive monitoring more expensive to the extent
technically feasible. Personally, I think there are things about IMAP
that could be impoved but I'm very skeptical that we can "solve" the
problem for mail in general. (Some others on this list are more
optimistic.)

S.

> 
> 				Ned
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

From leo@vegoda.org  Tue Oct 15 17:38:11 2013
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Date: Tue, 15 Oct 2013 17:37:54 -0700
From: Leo Vegoda <leo@vegoda.org>
To: Mike Demmers <mdietf@demmers.org>
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References: <524343B5.8010808@cs.tcd.ie> <20130930135150.23771137@cicero.demmers.org> <nrjb59ha1af4nhnc1to7758iammd4o7dn4@hive.bjoern.hoehrmann.de> <20131010050040.03051a8e@cicero.demmers.org> <j46d59lctinvqcnsan9s7ogu1l3oq10ab9@hive.bjoern.hoehrmann.de> <20131010092504.039f1217@cicero.demmers.org> <20131012180344.GA11447@vegoda.org> <20131012234500.2813ff1c@cicero.demmers.org> <20131013152508.GA12990@vegoda.org> <20131014160906.27647ff6@cicero.demmers.org>
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Cc: Perpass List Submit <perpass@ietf.org>
Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On Mon, Oct 14, 2013 at 04:09:06PM -0700, Mike Demmers wrote:

[...]

> > - how do people securely backup their keys?
> 
> They get backed up when they back up their system.

You seem to have ignored the word "securely" in that sentence. And
anyway, most people don't backup their systems at all. 

[...]

> I need to be very clear about what I am doing here by NOT using that stuff: I am deliberately sacrificing some security for usability.

I found it hard to distinguish between your thoughts about user
interface design and your ideas for a protocol. Frankly, I'd wait
for a strong protocol design before thinking about UI elements.

Have you considered documenting your thoughts in a less
conversational style?

Leo

From stephen.farrell@cs.tcd.ie  Tue Oct 15 18:09:50 2013
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Cc: Perpass List Submit <perpass@ietf.org>
Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On 10/16/2013 01:37 AM, Leo Vegoda wrote:
> Have you considered documenting your thoughts in a less
> conversational style?

Good suggestion. And there's time before the I-D
cutoff too. [1]

S.

[1] https://www.ietf.org/meeting/cutoff-dates-2013.html#IETF88

From mdietf@demmers.org  Tue Oct 15 19:54:49 2013
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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On Wed, 16 Oct 2013 02:09:31 +0100
Stephen Farrell <stephen.farrell@cs.tcd.ie> wrote:

> On 10/16/2013 01:37 AM, Leo Vegoda wrote:
> > Have you considered documenting your thoughts in a less
> > conversational style?  
> 
> Good suggestion. And there's time before the I-D
> cutoff too. [1]

You mean, write a draft?

I am new here...

I am only a user who really just came here out of frustration, thinking that if there was anything at all I could do to badger people to improve usablility, my main concern, I might do that. Just a consumer of RFCs, etc.

The whole default deny thing was just an offhand thought based off anothers comment. I surely didn't have any such thing in mind before that moment. I decided to just explore the idea a bit, thinking that either someone would point out a serious flaw, or if it seemed useful, someone wiser than I might possibly incorporate the idea in some improved form into something already being worked on.

At this point I don't really know if anyone else thinks this is a good idea, or a bad idea, or I am just another nutcase so out of the flow most are ignoring me. If it is the last, just say so, I am not thin skinned and will shut up about this with no rancor. ;-) 

> I found it hard to distinguish between your thoughts about user
> interface design and your ideas for a protocol. Frankly, I'd wait
> for a strong protocol design before thinking about UI elements.

Yes, I think I misunderstood what you were asking, as I thought to myself while writing that last exactly the same thing, that specifics like that were not really very relevant yet. Except to the degree they may shed some light on what might be required underneath.

I don't really think of this as a protocol, it is more in the nature of 'if you add this minor capability to MTAs, we could do this'.

In short form:

--

Encrypted email should be default deny, causing it to be a special case for a persons inner circle, providing anti-spam benefits, and allowing normal unencrypted mail and the many years of expected behaviors to procede just as before so as not to break important existing uses of email and encourage its use.

Add another extended command to ESMTP that allows a user agent to indicate that a message has been encrypted by it, so that state can be passed on and used further down the line to filter email, allowing a default deny mode to be used for encrypted mail. 

--

What is that? Not really a protocol, yes? Minor change to a protocol.

By the way -Steve- usually on lists there is no need to also CC people with your posts, but I noticed some here seemed to do that. I did notice sometimes the list, or at least the archive, seems a little slow. What is the norm here? 

-Mike

From mdietf@demmers.org  Tue Oct 15 20:46:39 2013
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On Tue, 15 Oct 2013 17:37:54 -0700
Leo Vegoda <leo@vegoda.org> wrote:

> > They get backed up when they back up their system.  
> 
> You seem to have ignored the word "securely" in that sentence. And
> anyway, most people don't backup their systems at all. 

Here is, I hope, a better answer to your question 'How are keys securely backed up' , which I now understabd better:

That is handled by the underlying program you are using to encrypt your mail, and so has nothng to do with this proposal directly - it's implementation dependent. Out of scope.

For example, here I have Claws-Mail with gnupg installed in a plugin. Gnupg stores (or Claws-Mail tells it to store) its keys in a little database, that is encrypted on disk, with a passphrase. So claws mail must have some way to access that, store keys, etc. Since that program would have to understand both 'default-deny' and whatever its interface to gnupg is, it should be able to store keys in the same way for this. And use whatever means are available to it in Claws-Mail for backup. Or on the system.

-Mike

From elijah@leap.se  Tue Oct 15 21:36:04 2013
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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On 10/15/2013 08:46 PM, Mike Demmers wrote:
> On Tue, 15 Oct 2013 17:37:54 -0700 Leo Vegoda <leo@vegoda.org>
> wrote:
> 
>>> They get backed up when they back up their system.
>> 
>> You seem to have ignored the word "securely" in that sentence. And 
>> anyway, most people don't backup their systems at all.
> 
> Here is, I hope, a better answer to your question 'How are keys
> securely backed up' , which I now understabd better:
> 
> That is handled by the underlying program you are using to encrypt
> your mail, and so has nothng to do with this proposal directly - it's
> implementation dependent. Out of scope.

I agree that this problem is out of scope, but it is very important
nonetheless. Every time someone hits upon a bright idea to make
encrypted communication easier to use they run up against the problem of
improving key management. These schemes, however, only work if the user
has access everywhere to their list of trusted keys. Essentially, the
authenticity problem gets transformed into an availability problem, and
the availability problem is perhaps even harder.

Three different free software projects try to securely tackle the
availability problem and could form the basis for an agnostic protocol
for portable and secure data sync:

(1) Firefox Sync https://www.mozilla.org/en-US/mobile/sync/
(2) SpiderOak's Crypton https://crypton.io/
(3) LEAP's Soledad https://leap.se/en/soledad

All of these are overkill for the narrow problem of key management.
Instead, they try to tackle the general question of secure data
synchronization and backup. I think this is probably the proper approach.

Our hope with the next version of Soledad is to add federation, so that
two or more users on different providers could share a synchronized,
searchable, client encrypted database. This could be useful for all
kinds of things.

-elijah

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--001a11c30fac45f98604e8d6471b
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CBOR does this pretty well:
<http://tools.ietf.org/html/draft-bormann-cbor-09>


On Tue, Oct 15, 2013 at 4:18 PM, Phillip Hallam-Baker <hallam@gmail.com>wrote:

>
>
>
> On Tue, Oct 15, 2013 at 5:18 AM, Paul Bakker <p.j.bakker@offspark.com>wrote:
>
>> On Oct 15, 2013 Phillip Hallam-Baker wrote:
>>
>> > As for getting rid of Assanine 1, I would love to get rid of it
>> completely. But as
>> > a pragmatic matter, there is just too much ASN.1 already. I have even
>> had
>> to
>> > reluctantly write a key signing format in Assanine.1 because having the
>> cert
>> > and key signing in different syntaxes is just too confusing.
>>
>> While I do understand the reluctance for ASN.1, in an embedded
>> environment I
>> really prefer it over text parsing and buffer duplication that is required
>> for JSON parsing..
>>
>
> There are real problems there for embedded apps and for cryptography. But
> extending the JSON approach modestly to incorporate fixed length strings
> and binary blobs solves 95% of them:
>
> https://datatracker.ietf.org/doc/draft-hallambaker-jsonbcd/
>
>
> Having to remember whether an object is implicit or explicit or vague is
> just too much hassle.
>
> --
> Website: http://hallambaker.com/
>

--001a11c30fac45f98604e8d6471b
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<div dir=3D"ltr">CBOR does this pretty well:<div>&lt;<a href=3D"http://tool=
s.ietf.org/html/draft-bormann-cbor-09">http://tools.ietf.org/html/draft-bor=
mann-cbor-09</a>&gt;</div></div><div class=3D"gmail_extra"><br><br><div cla=
ss=3D"gmail_quote">
On Tue, Oct 15, 2013 at 4:18 PM, Phillip Hallam-Baker <span dir=3D"ltr">&lt=
;<a href=3D"mailto:hallam@gmail.com" target=3D"_blank">hallam@gmail.com</a>=
&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote"><div><div class=3D"h5">On Tue, Oct 15, 2013 at 5:18 AM, Paul Bakker=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:p.j.bakker@offspark.com" target=3D=
"_blank">p.j.bakker@offspark.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div>On Oct 15, 2013 Phillip Hallam-Baker wrote:<br>

<br>
&gt; As for getting rid of Assanine 1, I would love to get rid of it<br>
completely. But as<br>
&gt; a pragmatic matter, there is just too much ASN.1 already. I have even =
had<br>
to<br>
&gt; reluctantly write a key signing format in Assanine.1 because having th=
e<br>
cert<br>
&gt; and key signing in different syntaxes is just too confusing.<br>
<br>
</div>While I do understand the reluctance for ASN.1, in an embedded enviro=
nment I<br>
really prefer it over text parsing and buffer duplication that is required<=
br>
for JSON parsing..<br></blockquote><div><br></div></div></div><div>There ar=
e real problems there for embedded apps and for cryptography. But extending=
 the JSON approach modestly to incorporate fixed length strings and binary =
blobs solves 95% of them:</div>

<div><br></div><div><a href=3D"https://datatracker.ietf.org/doc/draft-halla=
mbaker-jsonbcd/" target=3D"_blank">https://datatracker.ietf.org/doc/draft-h=
allambaker-jsonbcd/</a>=A0</div></div><div class=3D"gmail_extra"><br></div>=
<div class=3D"gmail_extra">

<br></div><div class=3D"gmail_extra">Having to remember whether an object i=
s implicit or explicit or vague is just too much hassle.</div><span class=
=3D"HOEnZb"><font color=3D"#888888"><div><br></div>-- <br>Website: <a href=
=3D"http://hallambaker.com/" target=3D"_blank">http://hallambaker.com/</a><=
br>


</font></span></div></div>
</blockquote></div><br></div>

--001a11c30fac45f98604e8d6471b--

From hallam@gmail.com  Wed Oct 16 07:16:36 2013
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Date: Wed, 16 Oct 2013 10:16:15 -0400
Message-ID: <CAMm+LwhKSgeNjsdWmyd0opHuuaCwimsP8e_+r7qH7PVpEsMJoQ@mail.gmail.com>
From: Phillip Hallam-Baker <hallam@gmail.com>
To: Elijah Sparrow <elijah@leap.se>
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Cc: Perpass List Submit <perpass@ietf.org>
Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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--089e0122eca41f3ce404e8dc5855
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The subject is not out of scope if you decide to store the private key blob
in the cloud...

That looks to me like it might be the answer in some cases. I would rather
guarantee that the blob is strongly encrypted and can't be lost than have
the user export them to a USB stick under a weak password that they chose.

Peter has an interesting collection of PKCS#12 files...


Storage on the target device is preferably in a form that does not support
or better actively resists extraction. But that is quite expensive and
difficult to do well. There are issues such as leaking the key when it is
used (power analysis) that are hard problems.

--089e0122eca41f3ce404e8dc5855
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<div dir=3D"ltr">The subject is not out of scope if you decide to store the=
 private key blob in the cloud...<div><br></div><div>That looks to me like =
it might be the answer in some cases. I would rather guarantee that the blo=
b is strongly encrypted and can&#39;t be lost than have the user export the=
m to a USB stick under a weak password that they chose.</div>
<div><br></div><div>Peter has an interesting collection of PKCS#12 files...=
</div><div><br></div><div><br></div><div>Storage on the target device is pr=
eferably in a form that does not support or better actively resists extract=
ion. But that is quite expensive and difficult to do well. There are issues=
 such as leaking the key when it is used (power analysis) that are hard pro=
blems.</div>
</div>

--089e0122eca41f3ce404e8dc5855--

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Joel,

Thanks for the followup, identifying the CABF as the source of the key 
length change.

Steve



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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Stephen,

Just commenting on one of your comments ...
> ...
>> What is this "cleartext IMAP" of which you speak?
> I guess that's a fair comment - we don't know that they're
> able gather to inbox data via IMAP due to it being sent in
> clear,  however that seems like a reasonable guess based
> on the newspaper story which says that collection is done
> by telcos that are "overseas" and assuming that TLS is not
> busted for these services.
Based only on the story that you cited, and your observation about
telcos being the sources of the info, might it be the case that the
telcos were also the mail providers? I'm not sure how to interpret
the slides the the cite story included. That sort of explanation
would be consistent with Ned's observations about commercial provider
use of SSL to protect IMAP/POP access.

Steve

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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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> That is handled by the underlying program you are using to encrypt 
> your mail, and so has nothng to do with this proposal directly - it's 
> implementation dependent. Out of scope.

I agree that this problem is out of scope, but it is very important
nonetheless. Every time someone hits upon a bright idea to make encrypted
communication easier to use they run up against the problem of improving key
management. 

[RS> ]  +1  Thank you for pointing that out.  It's the one of the core
problems usabiligy and implementation. "We have met the enemy and it is us."




These schemes, however, only work if the user has access everywhere to their
list of trusted keys. Essentially, the authenticity problem gets transformed
into an availability problem, and the availability problem is perhaps even
harder.

Three different free software projects try to securely tackle the
availability problem and could form the basis for an agnostic protocol for
portable and secure data sync:

(1) Firefox Sync https://www.mozilla.org/en-US/mobile/sync/
(2) SpiderOak's Crypton https://crypton.io/
(3) LEAP's Soledad https://leap.se/en/soledad

All of these are overkill for the narrow problem of key management.
Instead, they try to tackle the general question of secure data
synchronization and backup. I think this is probably the proper approach.

Our hope with the next version of Soledad is to add federation, so that two
or more users on different providers could share a synchronized, searchable,
client encrypted database. This could be useful for all kinds of things.

-elijah
_______________________________________________
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From joe@cdt.org  Wed Oct 16 07:43:44 2013
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Subject: Re: [perpass] Encoding email security policy into email addresses.
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

I can't tell you how many conversations I've had lately with laypeople
and journalists who have tried to get up to speed with PGP and just
can't manage it... they inevitably ask me if there is a way to encrypt
email such that they have to know nothing or little to us it. I have
to tell them, not really. This seems to be getting in that direction!
So, thank you, for working on this... I do wish the delimiter were
something other than "?", but I'm not sure if there are any other
design choices.

best, Joe

On Tue Oct 15 13:26:46 2013, Phillip Hallam-Baker wrote:
> This is how the scheme works in practice.
> 
> 
> 
> Private Key Example
> 
> Alice uses a key generation tool to generate a public keypair. The
> public parameters in hexadecimal are:
> 
> Modulus  : a4 11 df 43 4a 6b a1 3e 29 78 5e 65 3c 3e 77 71 78 e5 be
> bf 1e aa cd 4b 07 94 78 05 c6 c8 06 52 a6 32 ce 8d 31 88 43 f5 78
> b4 17 03 99 b1 1b a4 fc e9 82 ec d7 10 f2 56 f4 dc b8 0e e4 d2 e9
> e8 ad 90 41 e6 9a 65 ad 97 c3 a6 f4 49 51 b2 cb 98 4c d9 19 ba b4
> b6 06 7c 87 79 3f 30 01 fa 1d d9 5c ad 94 f6 5e 09 2d 32 5f 1d f7
> ce d2 f5 d1 68 05 c6 95 2b 9a c3 f5 f4 8a f2 a1 a6 9d 7a de 93 
> Exponent : 01 00 01
> 
> The Key Identifier is calculated using SHA512 and truncated to 224
> bits to produce the Key Identifier value. The Key Identifier in
> Base32 encoding is:
> 
> KeyIdentifier:
> ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA
> 
> An email sender may send email to Alice through a compliant gateway
> as follows: alice@example.com Send email to Alice using encryption
> if and only if an encryption key for Alice can be found and Alice
> has published the email encryption policy 'encryption preferred' or
> stronger. ? alice@example.com Send email to Alice using encryption
> if and only if an encryption key for Alice can be found, otherwise
> report an error. 
> ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA?alice@example.com
> Send email to Alice using encryption if and only if an encryption
> key for Alice can be found that is directly endorsed under the
> specified key, otherwise report an error.
> ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA?? 
> alice@example.com Send email to Alice using encryption if and only
> if an encryption key for Alice can be found that is (directly or
> indierectly) endorsed under the specified key, otherwise report an
> error.
> 
> The key identifiers are 224 bits long plus an 8 bit prefix to
> specify the algorithm. It might well be desirable to trim them back
> to 160 bits but certainly no less than 128 bits.
> 
> Here is 160 bits: 
> AAAMDA-GF5JAP-IAH7P3A-DSAEYB-IAHMAFB?alice@example.com
> 
> Here is 128 bits: ADAHSA-CSZLAG-AAHTZ2A-IFAF3PF?alice@example.com
> 
> 
> The 128 bit key identifier might be strong enough for a personal
> key identifier since the difficulty of finding a key that would
> match by brute force would be 128 bits.
> 
> For an organizational key, there is a risk of the key being formed 
> maliciously so as to evade transparency requirements and so the
> longer identifier is 'probably' necessary.
> 
> 
> 
> This is how the scheme works in practice.
> 
> 
> 
> Private Key Example
> 
> Alice uses a key generation tool to generate a public keypair. The 
> public parameters in hexadecimal are:
> 
> Modulus  : a4 11 df 43 4a 6b a1 3e 29 78 5e 65 3c 3e 77 71 78 e5 be
> bf 1e aa cd 4b 07 94 78 05 c6 c8 06 52 a6 32 ce 8d 31 88 43 f5 78
> b4 17 03 99 b1 1b a4 fc e9 82 ec d7 10 f2 56 f4 dc b8 0e e4 d2 e9
> e8 ad 90 41 e6 9a 65 ad 97 c3 a6 f4 49 51 b2 cb 98 4c d9 19 ba b4
> b6 06 7c 87 79 3f 30 01 fa 1d d9 5c ad 94 f6 5e 09 2d 32 5f 1d f7
> ce d2 f5 d1 68 05 c6 95 2b 9a c3 f5 f4 8a f2 a1 a6 9d 7a de 93 
> Exponent : 01 00 01 The Key Identifier is calculated using SHA512
> and truncated to 224 bits to produce the Key Identifier value. The
> Key Identifier in Base32 encoding is: KeyIdentifier:
> ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA An email
> sender may send email to Alice through a compliant gateway as 
> follows:
> 
> alice@example.com <mailto:alice@example.com> Send email to Alice
> using encryption if and only if an encryption key for Alice can be
> found and Alice has published the email encryption policy
> 'encryption preferred' or stronger. ?alice@example.com
> <mailto:alice@example.com> Send email to Alice using encryption if
> and only if an encryption key for Alice can be found, otherwise
> report an error. 
> ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA?alice@example.com
>
> 
<mailto:alice@example.com>
> Send email to Alice using encryption if and only if an encryption 
> key for Alice can be found that is directly endorsed under the 
> specified key, otherwise report an error. 
> ABAFYA-ATQBAB-UAG4VXA-MMACY7-4AMIAB4-NWALTA-GSHYAK-5AA??alice@example.com
>
> 
<mailto:alice@example.com>
> Send email to Alice using encryption if and only if an encryption 
> key for Alice can be found that is (directly or indierectly) 
> endorsed under the specified key, otherwise report an error.
> 
> 
> The key identifiers are 224 bits long plus an 8 bit prefix to
> specify the algorithm. It might well be desirable to trim them back
> to 160 bits but certainly no less than 128 bits.
> 
> Here is 160 bits: 
> AAAMDA-GF5JAP-IAH7P3A-DSAEYB-IAHMAFB?alice@example.com 
> <mailto:alice@example.com>
> 
> Here is 128 bits: ADAHSA-CSZLAG-AAHTZ2A-IFAF3PF?alice@example.com
> <mailto:alice@example.com>
> 
> 
> The 128 bit key identifier might be strong enough for a personal
> key identifier since the difficulty of finding a key that would
> match by brute force would be 128 bits.
> 
> For an organizational key, there is a risk of the key being formed 
> maliciously so as to evade transparency requirements and so the
> longer identifier is 'probably' necessary.
> 
> -- Website: http://hallambaker.com/
> 
> 
> _______________________________________________ perpass mailing
> list perpass@ietf.org 
> https://www.ietf.org/mailman/listinfo/perpass
- -- 
Joseph Lorenzo Hall
Senior Staff Technologist
Center for Democracy & Technology
1634 I ST NW STE 1100
Washington DC 20006-4011
(p) 202-407-8825
(f) 202-637-0968
joe@cdt.org
PGP: https://josephhall.org/gpg-key
fingerprint: BE7E A889 7742 8773 301B 4FA1 C0E2 6D90 F257 77F8


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From stephen.farrell@cs.tcd.ie  Wed Oct 16 07:46:41 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On 10/16/2013 03:28 PM, Stephen Kent wrote:
> Stephen,
> 
> Just commenting on one of your comments ...
>> ...
>>> What is this "cleartext IMAP" of which you speak?
>> I guess that's a fair comment - we don't know that they're
>> able gather to inbox data via IMAP due to it being sent in
>> clear,  however that seems like a reasonable guess based
>> on the newspaper story which says that collection is done
>> by telcos that are "overseas" and assuming that TLS is not
>> busted for these services.
> Based only on the story that you cited, and your observation about
> telcos being the sources of the info, might it be the case that the
> telcos were also the mail providers? I'm not sure how to interpret
> the slides the the cite story included. That sort of explanation
> would be consistent with Ned's observations about commercial provider
> use of SSL to protect IMAP/POP access.

That could be but I guess we're not likely to be told;-)

I did take a peek to see if I could figure out if there're
lots of services running on 143 without STARTTLS but haven't
found anything that answers that question. I did find
this [1] (no idea how accurate though) which says their
survey found 4.7M listeners on 143, but there's no info
about how many have a usable STARTTLS config. With that
number of services, I guess collecting O(10^5) "inboxes"
per day in plaintext could be credible, but who knows.

But, nonetheless I think the question about 3-flavours
of IMAP and MTI is still worth thinking about.

S

[1] http://www.openemailsurvey.org/imap-143.html

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Stephen,

I realized that I forgot to reply to your message about MTI vs. MTU for 
IMAP.

Even absent Ned's detailed note showing that most major e-mail providers 
already
mandate use of TLS for access, I would not see the Washington Post story as
evidence that we need to change IMAP (and POP?) to mandate _use_ of TLS. 
One reason
is that these e-mail access protocols are used in enterprise environment 
where passive
wiretapping often not considered a viable attack. Internal to the 
enterprise net
there is usually a perception of adequate physical security. For 
external access,
VPN use is usually mandated. If we mandated use of TLS with these 
protocols, and
access was already protected by IPsec, it would seem overkill, and 
create possible PMTU
problems.

This is another example of why it's hard to justify MTU for protocols, 
independent of
context. Ned's observations, and Joel's, suggest that when a service 
providers decide that
security against passive wiretapping is a concern, they make use of it 
(eventually),
irrespective of IETF mandates. It's disappointing that, as Ned noted, 
the providers
elected to adopt a different port for this protected access, contrary to 
IETF specs.
Maybe this shows that we're not always in the best position to decide 
the MTI details :-( .

Steve

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<html>
  <head>
    <meta content="text/html; charset=us-ascii"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Stephen,<br>
    <br>
    I realized that I forgot to reply to your message about MTI vs. MTU
    for IMAP.<br>
    <br>
    Even absent Ned's detailed note showing that most major e-mail
    providers already <br>
    mandate use of TLS for access, I would not see the Washington Post
    story as<br>
    evidence that we need to change IMAP (and POP?) to mandate <u>use</u>
    of TLS. One reason<br>
    is that these e-mail access protocols are used in enterprise
    environment where passive <br>
    wiretapping often not considered a viable attack. Internal to the
    enterprise net<br>
    there is usually a perception of adequate physical security. For
    external access,<br>
    VPN use is usually mandated. If we mandated use of TLS with these
    protocols, and<br>
    access was already protected by IPsec, it would seem overkill, and
    create possible PMTU<br>
    problems.<br>
    <br>
    This is another example of why it's hard to justify MTU for
    protocols, independent of <br>
    context. Ned's observations, and Joel's, suggest that when a service
    providers decide that<br>
    security against passive wiretapping is a concern, they make use of
    it (eventually),<br>
    irrespective of IETF mandates. It's disappointing that, as Ned
    noted, the providers <br>
    elected to adopt a different port for this protected access,
    contrary to IETF specs.<br>
    Maybe this shows that we're not always in the best position to
    decide the MTI details <span class="moz-smiley-s2"><span> :-( </span></span>.<br>
    <br>
    Steve<br>
  </body>
</html>

--------------000406030204000805090107--

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To: Stephen Kent <kent@bbn.com>
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On Oct 16, 2013, at 8:23 AM, Stephen Kent <kent@bbn.com> wrote:
> One reason
> is that these e-mail access protocols are used in enterprise =
environment where passive=20
> wiretapping often not considered a viable attack.=20

As someone who remembers the switch to Kerberos and then SSH driven by =
password sniffers in the LAN, including one which got my own password =
back in the day, I find this assumption grossly unrealistic.

You have to REALLY lock-down the LAN, including properly configure high =
end switches with ARP filtering and/or other layer 3 management, for =
this assumption to be even remotely plausible.


Finally, we must consider passive wiretapping an active attack.  The =
only thing which prevents a passive wiretap from modifying (rather than =
just monitoring) traffic is almost invariably the will of the attacker, =
not any technical limitation, since even on-path wiretappers can packet =
inject, allowing the attacker to trivially promote themselves into a =
MitM situation in almost all circumstances.

--
Nicholas Weaver                  it is a tale, told by an idiot,
nweaver@icsi.berkeley.edu                full of sound and fury,
510-666-2903                                 .signifying nothing
PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub.asc


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From atlunde@panix.com  Wed Oct 16 10:33:05 2013
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On 10/16/2013 10:23 AM, Stephen Kent wrote:
> Stephen,
>
> I realized that I forgot to reply to your message about MTI vs. MTU for
> IMAP.
>
> Even absent Ned's detailed note showing that most major e-mail providers
> already
> mandate use of TLS for access, I would not see the Washington Post story as
> evidence that we need to change IMAP (and POP?) to mandate _use_ of TLS.

Another concern might be that the Oauth 2.0 family of protocols, as used 
on various social medial, could be used to dump a "profile" for a user 
(which might include contacts).

There's not a lot of uniform cross-provider interop yet (in say, openid 
connect), but the per-provider extensions seem able to leak excessive 
user information in some use cases.

(Based on what I've read, I haven't looked at the traffic myself).

-- 
     Albert Lunde  albert-lunde@northwestern.edu
                   atlunde@panix.com  (address for personal mail)

From hallam@gmail.com  Wed Oct 16 10:37:09 2013
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We can use almost anything as the separator except for

It can't be @ (reserved for use as a separator)
It can't be ! (legacy of UUCP)
It can't be : or . (used in IP addresses)
It can't be - or _  (widely used already)
It can't be % (used as escaping in URIs)
It can't be < or > and probably not [({ })] either

That leaves very little. I dislike $.

I chose ? because it poses a problem for the NSA to decrypt which is a
reasonable mnemonic.

The other options I looked at were =, &, ^, *, +, #


Could do # I guess. But that will create issues with URI encoding (so will
?)


I think one big advantage of the approach is that it is easy to explain
that the gobbledygook in front of the name represents the encryption key.
Now it is really an index to the key rather than the key itself, just like
the DNS 'address' is actually an index not an address.

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<div dir=3D"ltr">We can use almost anything as the separator except for<div=
><br></div><div>It can&#39;t be @ (reserved for use as a separator)</div><d=
iv>It can&#39;t be ! (legacy of UUCP)</div><div>It can&#39;t be : or . (use=
d in IP addresses)</div>
<div>It can&#39;t be - or _ =A0(widely used already)</div><div>It can&#39;t=
 be % (used as escaping in URIs)</div><div>It can&#39;t be &lt; or &gt; and=
 probably not [({ })] either</div><div><br></div><div>That leaves very litt=
le. I dislike $.</div>
<div><br></div><div>I chose ? because it poses a problem for the NSA to dec=
rypt which is a reasonable mnemonic.</div><div><br></div><div>The other opt=
ions I looked at were =3D, &amp;, ^, *, +, #</div><div><br></div><div><br>
</div><div>Could do # I guess. But that will create issues with URI encodin=
g (so will ?)</div><div><br></div><div><br></div><div>I think one big advan=
tage of the approach is that it is easy to explain that the gobbledygook in=
 front of the name represents the encryption key. Now it is really an index=
 to the key rather than the key itself, just like the DNS &#39;address&#39;=
 is actually an index not an address.</div>
</div>

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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At 05:47 14-10-2013, Tony Rutkowski wrote:
>Most users make their choice of provider
>and platform based on factors such as:
>cost, performance, ease of use, SPAM
>and malware reduction, image (i.e.,
>account/domain name), mobility,
>identity theft mitigation, familiarity,
>and social feature sets.  Like credit
>card fraud protection, some of those
>features require a lot of invasive knowledge.
>Fortunately, there are a lot of providers
>competing in the marketplace.

I could do a study to find out which provider is popular in the 
IETF.  The result would probably be gmail.com.  There aren't that 
many providers competing in the marketplace.  It is difficult to 
compete when most users want a free service.  For what it is worth, 
there hasn't been any noticeable shift in providers used by IETF participants.

>So as many have opined, the IETF is a
>technical standards body, not an evangelical
>organization for socio-political views, and
>hopefully will continue to do what it
>does well - produce usable protocols - and
>leave the implementation choices to others
>based on their assessment of the risk.

If the IETF is a technical standards body it should not discuss about 
privacy in its specifications.  That would not go down well in 
practice as other bodies will point out that the IETF is designing 
standards without any thought to how it affects the users.

Security considerations are mandatory for IETF specifications.  I 
gather that there would be some guidance in that section so that 
people making implementation choices can assess the risks.

The topic in the subject line is about mandatory-to-implement.  If 
the feature is not available in an implementation the user has less 
choices.  The default setting also matters.  If a feature is off by 
default the average user won't turn it on.  Note that some 
implementations usually make that choice based on feedback from the 
users.  As an example, if the key length chosen by the user is 
considered as insecure, the implementation might generate a warning 
or exit with an error message.

Regards,
-sm 


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Cc: perpass@ietf.org
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 16, 2013, at 8:23 AM, Stephen Kent <kent@bbn.com> wrote:
>> One reason
>> is that these e-mail access protocols are used in enterprise environment where passive
>> wiretapping often not considered a viable attack.
> As someone who remembers the switch to Kerberos and then SSH driven by password sniffers in the LAN, including one which got my own password back in the day, I find this assumption grossly unrealistic.
That used to be a valid concern. I'm not sure why, but it seems to be 
less of a concern
today. Maybe use of VLANs, better switch management, ...
> You have to REALLY lock-down the LAN, including properly configure high end switches with ARP filtering and/or other layer 3 management, for this assumption to be even remotely plausible.
OK.
> Finally, we must consider passive wiretapping an active attack.  The only thing which prevents a passive wiretap from modifying (rather than just monitoring) traffic is almost invariably the will of the attacker, not any technical limitation, since even on-path wiretappers can packet inject, allowing the attacker to trivially promote themselves into a MitM situation in almost all circumstances.
I don't agree that we should ignore the differences between passive and 
active wiretapping.
I do agree that passive wiretapping can be augment with active attacks 
of various sorts.
It's not just the "will" of the attacker that matters; it's also the 
capabilities of the
attacker and their sensitivity to being detected.

Steve

From nweaver@ICSI.Berkeley.EDU  Wed Oct 16 12:47:54 2013
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On Oct 16, 2013, at 12:30 PM, Stephen Kent <kent@bbn.com> wrote:
>> Finally, we must consider passive wiretapping an active attack.  The =
only thing which prevents a passive wiretap from modifying (rather than =
just monitoring) traffic is almost invariably the will of the attacker, =
not any technical limitation, since even on-path wiretappers can packet =
inject, allowing the attacker to trivially promote themselves into a =
MitM situation in almost all circumstances.
> I don't agree that we should ignore the differences between passive =
and active wiretapping.
> I do agree that passive wiretapping can be augment with active attacks =
of various sorts.
> It's not just the "will" of the attacker that matters; it's also the =
capabilities of the
> attacker and their sensitivity to being detected.


Capability wise, there is nothing except cryptographic data integrity =
that prevents an eavesdropper from injecting their own traffic.  On =
HTTP, this enables redirecting the browser to an arbitrary site (for =
exploitation), extracting any not-SSL-only cookies, injecting arbitrary =
code at the end of a web page, etc.  Absent DNSSEC validation on the =
part of the victim, DNS injection allows the attacker to MITM any =
connection. =20

Similarly, at layer 2, absent significant protection in the switch, =
properly configured, both DHCP and ARP injection allows similar total =
hijacking.  There are no capability limitations of note for a "passive" =
eavesdropper who wants to become active.

Thus it really is "will" as convenient shorthand: is the attacker =
willing to use this and chance getting caught if a subtle detector is =
actually looking for the signs of attack?


We need universal protection against active adversaries, because the =
precedents have been set and the distinction between passive and active =
really is the willingness of the adversary to include active techniques. =
 We need end-to-end data integrity on all communication and if you have =
end-to-end integrity, anything point-to-point rather than broadcast =
should also include confidentiality since you can just about get it for =
free by this point.

--
Nicholas Weaver                  it is a tale, told by an idiot,
nweaver@icsi.berkeley.edu                full of sound and fury,
510-666-2903                                 .signifying nothing
PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub.asc


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From stephen.farrell@cs.tcd.ie  Wed Oct 16 13:24:11 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hiya,

On 10/16/2013 08:47 PM, Nicholas Weaver wrote:
> 
> We need universal protection against active adversaries, because
> the precedents have been set and the distinction between passive
> and active really is the willingness of the adversary to include
> active techniques.  We need end-to-end data integrity on all
> communication and if you have end-to-end integrity, anything
> point-to-point rather than broadcast should also include
> confidentiality since you can just about get it for free by this
> point.

While I sympathise with more protection and with moves towards
more-than-MTI, and I fully agree with you about LAN traffic, I
think also requiring e2e mutual auth (which I think is implied
in the above) would be counterproductive.

The problem is that that introduces a management problem into
every scenario and that management overhead is I think is (today)
the main reason why the most of the MTI security features we
define don't get traction until the exploits experienced by
users/networks become intolerable.

I think the path forward is more like making opportunistic
security mechanisms (in particular confidentiality) more-than-MTI
in a way that builds in some security (against passive attacks)
as an inherent feature of new protocols, but also results in
a far easier transition from there to fully authenticated,
compared to the massive gap between cleartext and fully
authenticated.

S.


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From: Phillip Hallam-Baker <hallam@gmail.com>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Wed, Oct 16, 2013 at 10:21 AM, Stephen Kent <kent@bbn.com> wrote:

> Joel,
>
> Thanks for the followup, identifying the CABF as the source of the key
> length change.


I recently came across a document I wrote in 1999 arguing for 2048 bit
keys...

The problem that required CABForum intervention was that a 1024 bit key is
compatible with more browsers and always will be. Thus there is a
commercial advantage in using a 1024 bit cert so as to maximize the
customer base.

CAs were not prepared to stop issuing 1024 bit certs if doing so would lose
sales to a competitor. Browsers could not stop recognizing 1024 bit certs
as long as they were the majority of certs in use.

Agreeing to stop issue of 1024 bit certs (with some rare exceptions outside
the WebPKI) required both groups to make a mutual commitment.


-- 
Website: http://hallambaker.com/

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Wed, Oct 16, 2013 at 10:21 AM, Stephen Kent <span dir=3D"ltr">&l=
t;<a href=3D"mailto:kent@bbn.com" target=3D"_blank">kent@bbn.com</a>&gt;</s=
pan> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Joel,<br>
<br>
Thanks for the followup, identifying the CABF as the source of the key leng=
th change.</blockquote><div><br></div><div>I recently came across a documen=
t I wrote in 1999 arguing for 2048 bit keys...</div><div><br></div><div>
The problem that required CABForum intervention was that a 1024 bit key is =
compatible with more browsers and always will be. Thus there is a commercia=
l advantage in using a 1024 bit cert so as to maximize the customer base.</=
div>
<div><br></div><div>CAs were not prepared to stop issuing 1024 bit certs if=
 doing so would lose sales to a competitor. Browsers could not stop recogni=
zing 1024 bit certs as long as they were the majority of certs in use.</div=
>
<div><br></div><div>Agreeing to stop issue of 1024 bit certs (with some rar=
e exceptions outside the WebPKI) required both groups to make a mutual comm=
itment.</div><div><br></div></div><div><br></div>-- <br>Website: <a href=3D=
"http://hallambaker.com/">http://hallambaker.com/</a><br>

</div></div>

--001a11c3836c0903bc04e8e17c6c--

From derhoermi@gmx.net  Wed Oct 16 14:08:16 2013
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From: Bjoern Hoehrmann <derhoermi@gmx.net>
To: Nicholas Weaver <nweaver@ICSI.Berkeley.EDU>
Date: Wed, 16 Oct 2013 23:08:07 +0200
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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* Nicholas Weaver wrote:
>We need universal protection against active adversaries, because the 
>precedents have been set and the distinction between passive and active 
>really is the willingness of the adversary to include active techniques.  
>We need end-to-end data integrity on all communication and if you have 
>end-to-end integrity, anything point-to-point rather than broadcast 
>should also include confidentiality since you can just about get it for 
>free by this point.

Adversaries do not necessarily have the resources to do anything they
are willing to do. Active attacks might require more expensive hardware
which they might not have the capital for, or they may increase latency
so that people get angry about them slowing down the Internet too much.

Authenticity and integrity are also sometimes at odds with other
desirable features like anonymity, deniability, and maintainability. In
some cases systems are not purely end-to-end, e-mail for instance also
has public discussion lists and newsletters with millions of subscribers
to consider.
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

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| One reason is that these e-mail access protocols are used in
| enterprise environment where passive wiretapping often not
| considered a viable attack. Internal to the enterprise net there
| is usually a perception of adequate physical security.

I have discovered, in the last couple of months of investigation, to
my disappointment and horror, that many many very large IT shops in
the US that are doing telecoms between their various offices and
datacenters, do not encrypt.  Large telecoms users typically use MPLS
or telco provided "dark fiber".  Cleartext.  No encryption.  Not at
the wireline layer, not at the packet layer, and not at the
application layer.

The statement I get back when I have been investigating this is has
always been along the lines of "it's OUR glass" / "it's OUR circuit",
"it makes doing packet tracing and intrusion detection harder" (that
one makes me headdesk hard), "why should we be afraid of our telco
partner?", and "just because Google is doing it doesn't mean it's
useful to us".

I am working hard to assume ignorance and pollyanna-ism, instead of
malice and NSA-suborn-ism on the part of the CTOs and their security
people.

But anyway, that means that corporate use of Outlook & Exchange, Lync,
SAML, Intranet HTTP, SIP, remote file stores, IMAP & SMTP, remote
database access, remote backup, and internal customer and financial
records are completely transparent to the NSA, and to most every other
major spook agency in the world.  The NSA probably has a better view
into the second by second status of the health and wealth of the US
and world economy than any of the financial regulators.

..m

From hallam@gmail.com  Wed Oct 16 19:35:11 2013
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Subject: [perpass] Draft describing how to evaluate trust models in the age of PRISM
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http://tools.ietf.org/html/draft-hallambaker-prismproof-trust-00

I would like to spend a lot longer getting this right but don't have time
to do that and write code.

The work factor measures may be of general interest. In particular
introducing the time element has interesting effects.

-- 
Website: http://hallambaker.com/

--001a1135e5a48c449404e8e6aa75
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<div dir=3D"ltr"><a href=3D"http://tools.ietf.org/html/draft-hallambaker-pr=
ismproof-trust-00">http://tools.ietf.org/html/draft-hallambaker-prismproof-=
trust-00</a><div><br></div><div>I would like to spend a lot longer getting =
this right but don&#39;t have time to do that and write code.</div>
<div><br></div><div>The work factor measures may be of general interest. In=
 particular introducing the time element has interesting effects.</div><div=
><br></div><div>-- <br>Website: <a href=3D"http://hallambaker.com/">http://=
hallambaker.com/</a><br>

</div></div>

--001a1135e5a48c449404e8e6aa75--

From joelja@bogus.com  Wed Oct 16 23:09:37 2013
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References: <525475AA.2010907@cs.tcd.ie> <525590CC.4030505@bbn.com> <5255EC1D.5040006@cs.tcd.ie> <5256F6CD.4090508@bbn.com> <5256FB71.8040903@cs.tcd.ie> <525722C4.4020408@bbn.com> <5C28CCD5-4B7D-4BFB-94F4-1C33E43BDCD7@cdt.org> <525BE7DC.4080407@gmail.com> <95859161-25E3-45BC-A5C2-B3C548FB2417@acm.org> <525C031B.5030100@bbn.com> <525C2099.6010307@cs.tcd.ie> <525C2C44.2070404@bbn.com> <525C8130.2000606@cs.tcd.ie> <525D183E.7000200@cs.tcd.ie> <525EAF77.3090203@bbn.com> <CANW5CYXY1fB5eC6LjmQoP=qDwgZAwB-85fAuBFvYRNo7qR2Lvg@mail.gmail.com>
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Cc: perpass@ietf.org, Stephen Kent <kent@bbn.com>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 16, 2013, at 5:21 PM, Mark Atwood <me@mark.atwood.name> wrote:

> | One reason is that these e-mail access protocols are used in
> | enterprise environment where passive wiretapping often not
> | considered a viable attack. Internal to the enterprise net there
> | is usually a perception of adequate physical security.
>=20
> I have discovered, in the last couple of months of investigation, to
> my disappointment and horror, that many many very large IT shops in
> the US that are doing telecoms between their various offices and
> datacenters, do not encrypt.  Large telecoms users typically use MPLS
> or telco provided "dark fiber".  Cleartext.  No encryption.  Not at
> the wireline layer, not at the packet layer, and not at the
> application layer.
>=20
> The statement I get back when I have been investigating this is has
> always been along the lines of "it's OUR glass" / "it's OUR circuit",
> "it makes doing packet tracing and intrusion detection harder" (that
> one makes me headdesk hard), "why should we be afraid of our telco
> partner?", and "just because Google is doing it doesn't mean it's
> useful to us".
>=20
> I am working hard to assume ignorance and pollyanna-ism, instead of
> malice and NSA-suborn-ism on the part of the CTOs and their security
> people.
>=20
> But anyway, that means that corporate use of Outlook & Exchange, Lync,
> SAML, Intranet HTTP, SIP, remote file stores, IMAP & SMTP, remote
> database access, remote backup, and internal customer and financial
> records are completely transparent to the NSA, and to most every other
> major spook agency in the world.  The NSA probably has a better view
> into the second by second status of the health and wealth of the US
> and world economy than any of the financial regulators.

MPLS VPN is more virtually private not virtual private. If you consider =
that the functional equivalent of your own wavelength or your own glass =
then maybe it's good enough for your purposes. from my vantage point =
none of those things are the tautological equivalent of an ipsec vpn

Wire-speed link-layer encryption is rather expensive at the feeds and =
speeds of modern routers. IP layer encapsulation in a ce-router in an =
MPLS hand-off is an expensive place to put it since that encryption =
complex is going on a asic in the fowarding path. For relatively slow =
links lots of these things are doable in a software forwarding engine=85 =
for 16 x 10Gb/s it's going to cost you.

operators and their customers make tradeoffs all the time, this is one =
of them.

=
http://www.safenet-inc.com/products/data-protection/network-wan-encryption=
/ethernet-encryption/

>=20
> ..m
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>=20


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From sm@resistor.net  Wed Oct 16 23:45:40 2013
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From: SM <sm@resistor.net>
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Cc: perpass@ietf.org, Stephen Kent <kent@bbn.com>, Mark Atwood <me@mark.atwood.name>
Subject: [perpass] When private is equated with secure (was: mandatory-to-implement vs. more?)
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Hi Joel,
At 23:09 16-10-2013, joel jaeggli wrote:
>MPLS VPN is more virtually private not virtual private. If you 
>consider that the functional equivalent of your own wavelength or 
>your own glass then maybe it's good enough for your purposes. from 
>my vantage point none of those things are the tautological 
>equivalent of an ipsec vpn

[snip]

>operators and their customers make tradeoffs all the time, this is 
>one of them.

If I am not mistaken IP VPN has been sold over the years as a secure 
link.  That might have been good enough previously (see above about 
tradeoffs).  The threat evolves over time.  I am not thinking about 
state-sponsored surveillance here.  The tradeoff seems to be that the 
link is secure as it is private.

Regards,
-sm 


From scott.brim@gmail.com  Thu Oct 17 04:52:46 2013
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Subject: Re: [perpass] When private is equated with secure (was: mandatory-to-implement vs. more?)
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On Oct 17, 2013 2:45 AM, "SM" <sm@resistor.net> wrote:
> If I am not mistaken IP VPN has been sold over the years as a secure
link.

"IP VPN" includes not only MPLS VPN but also e2e IPsec. Also the meaning of
"secure" has been diluted down by marketing.

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<p dir=3D"ltr"><br>
On Oct 17, 2013 2:45 AM, &quot;SM&quot; &lt;<a href=3D"mailto:sm@resistor.n=
et">sm@resistor.net</a>&gt; wrote:<br>
&gt; If I am not mistaken IP VPN has been sold over the years as a secure l=
ink. =A0</p>
<p dir=3D"ltr">&quot;IP VPN&quot; includes not only MPLS VPN but also e2e I=
Psec. Also the meaning of &quot;secure&quot; has been diluted down by marke=
ting. </p>

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Mark,

I've long referred to non-crypto VPNs as "virtually" private nets, for the
reasons you note. More cluefull enterprises do use encrypting firewalls for
inter-site protection. Cisco, Juniper, Checkpoint and others have made a
fair amount of money selling devices for this purpose.

When  alluded to remote access by employees, I was thinking along the lines
of road warriors, using IPsec or SSH tunnels for remote access.

I don't think we've seen any evidence to suggest that NSA is 
eavesdropping on
inter-site enterprise comms, at least for U.S companies, based on the 
Snodwen
docs released (so far).

Steve

From joelja@bogus.com  Thu Oct 17 07:49:14 2013
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From: joel jaeggli <joelja@bogus.com>
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Cc: perpass@ietf.org, Stephen Kent <kent@bbn.com>, Mark Atwood <me@mark.atwood.name>
Subject: Re: [perpass] When private is equated with secure (was: mandatory-to-implement vs. more?)
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On Oct 16, 2013, at 11:44 PM, SM <sm@resistor.net> wrote:

> Hi Joel,
> At 23:09 16-10-2013, joel jaeggli wrote:
>> MPLS VPN is more virtually private not virtual private. If you =
consider that the functional equivalent of your own wavelength or your =
own glass then maybe it's good enough for your purposes. from my vantage =
point none of those things are the tautological equivalent of an ipsec =
vpn
>=20
> [snip]
>=20
>> operators and their customers make tradeoffs all the time, this is =
one of them.
>=20
> If I am not mistaken IP VPN has been sold over the years as a secure =
link.

It doesn't take a lot of sophistication to understand that putting a new =
header on the outsside and whacking an lsp on something doesn't make it =
secure in the encryption sense. when you still use the inner ip header =
as a hash for flow distribution across trunks, that ought be a reminder =
that you're a label strip away from an ip packet.

Regarding marketing, I hear that beer makes me smarter and cigarettes =
more sophisticated as well.


>  That might have been good enough previously (see above about =
tradeoffs).  The threat evolves over time.  I am not thinking about =
state-sponsored surveillance here.  The tradeoff seems to be that the =
link is secure as it is private.
>=20
> Regards,
> -sm=20


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From kent@bbn.com  Thu Oct 17 07:58:43 2013
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To: Nicholas Weaver <nweaver@ICSI.Berkeley.EDU>
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Cc: perpass@ietf.org
Subject: Re: [perpass] mandatory-to-implement vs. more?
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> ...
>
>
> Capability wise, there is nothing except cryptographic data integrity that prevents an eavesdropper from injecting their own traffic.  On HTTP, this enables redirecting the browser to an arbitrary site (for exploitation), extracting any not-SSL-only cookies, injecting arbitrary code at the end of a web page, etc.  Absent DNSSEC validation on the part of the victim, DNS injection allows the attacker to MITM any connection.
The ability to effect active and passive attacks is not uniform, and 
often not equivalent,
at least not on a per link basis. An attacker may be able to listen to a 
satellite down link or
a fiber cable, but not be able to inject packets into these links. So it 
is not quite accurate
to assert that any adversary who can passively monitor (a link) can also 
engage in active attacks
(on that link). The general form of active attacks that we usually 
assume in IETF security assesments
are MITM, which may be very hard to effect, depending on the context.
> Similarly, at layer 2, absent significant protection in the switch, properly configured, both DHCP and ARP injection allows similar total hijacking.  There are no capability limitations of note for a "passive" eavesdropper who wants to become active.
What constitutes "significant protection?"
> Thus it really is "will" as convenient shorthand: is the attacker willing to use this and chance getting caught if a subtle detector is actually looking for the signs of attack?
I think it is more than just a concern re being detected.
> We need universal protection against active adversaries, because the precedents have been set and the distinction between passive and active really is the willingness of the adversary to include active techniques.  We need end-to-end data integrity on all communication and if you have end-to-end integrity, anything point-to-point rather than broadcast should also include confidentiality since you can just about get it for free by this point.
I agree that adding confidentiality is almost free once you have 
accepted the costs of integrity.
There may be hidden costs, though, of the sort I mentioned earlier, 
e.g., reduced ability to effect
traffic engineering, load balancing, and debugging.

When you mention integrity do you mean integrity w/o authentication? To 
me that's reminiscent of
the Rocky and Bullwinkle ad cut-away about fan mail from a flounder. If 
a bottle containing a note
were securely sealed, then one might assume that it was afforded 
integrity. But without authentication,
we don't know which flounder sent the note, which seems unsatisfying. 
Integrity w/o authentication
is MUCH easier than authenticated integrity, but I worry that folks will 
misinterpret the security
they're getting, with unfortunate results.
> --
> Nicholas Weaver                  it is a tale, told by an idiot,
> nweaver@icsi.berkeley.edu                full of sound and fury,
> 510-666-2903                                 .signifying nothing
> PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub.asc
>


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Cc: perpass <perpass@ietf.org>, Stephen Kent <kent@bbn.com>, Tim Moses <tim.moses@entrust.com>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 16, 2013, at 1:24 PM, Phillip Hallam-Baker <hallam@gmail.com> =
wrote:

>=20
>=20
>=20
> On Wed, Oct 16, 2013 at 10:21 AM, Stephen Kent <kent@bbn.com> wrote:
> Joel,
>=20
> Thanks for the followup, identifying the CABF as the source of the key =
length change.
>=20
> I recently came across a document I wrote in 1999 arguing for 2048 bit =
keys...
>=20
> The problem that required CABForum intervention was that a 1024 bit =
key is compatible with more browsers and always will be. Thus there is a =
commercial advantage in using a 1024 bit cert so as to maximize the =
customer base.
>=20
> CAs were not prepared to stop issuing 1024 bit certs if doing so would =
lose sales to a competitor. Browsers could not stop recognizing 1024 bit =
certs as long as they were the majority of certs in use.
>=20
> Agreeing to stop issue of 1024 bit certs (with some rare exceptions =
outside the WebPKI) required both groups to make a mutual commitment.
>=20

which is pretty much the point I was making in terms of citing it as =
expensive  for the operators and consumers , but necessary. As a content =
provider I would have continued to use 1024 bit keys  as long as was =
plausible because the computational hit is significant enough that =
caused us to swap in an entire new generation of hardware.

>=20
> --=20
> Website: http://hallambaker.com/
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


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To: joel jaeggli <joelja@bogus.com>
Thread-Topic: [perpass] When private is equated with secure (was: mandatory-to-implement vs. more?)
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Cc: SM <sm@resistor.net>, "<perpass@ietf.org>" <perpass@ietf.org>, Stephen Kent <kent@bbn.com>, Mark Atwood <me@mark.atwood.name>
Subject: Re: [perpass] When private is equated with secure (was:	mandatory-to-implement vs. more?)
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On Oct 17, 2013, at 5:36 PM, joel jaeggli <joelja@bogus.com> wrote:

>=20
> On Oct 16, 2013, at 11:44 PM, SM <sm@resistor.net> wrote:
>=20
>> Hi Joel,
>> At 23:09 16-10-2013, joel jaeggli wrote:
>>> MPLS VPN is more virtually private not virtual private. If you consider=
 that the functional equivalent of your own wavelength or your own glass th=
en maybe it's good enough for your purposes. from my vantage point none of =
those things are the tautological equivalent of an ipsec vpn
>>=20
>> [snip]
>>=20
>>> operators and their customers make tradeoffs all the time, this is one =
of them.
>>=20
>> If I am not mistaken IP VPN has been sold over the years as a secure lin=
k.
>=20
> It doesn't take a lot of sophistication to understand that putting a new =
header on the outsside and whacking an lsp on something doesn't make it sec=
ure in the encryption sense. when you still use the inner ip header as a ha=
sh for flow distribution across trunks, that ought be a reminder that you'r=
e a label strip away from an ip packet.

Yeah. The term has been used for a variety of things, that are "virtually p=
rivate" in various different senses. I've seen it used for phone networks t=
o indicate that you can dial a short number ("It's a VPN, so you can dial 4=
903 instead of 7534903!"), for MPLS networks because you can move any proto=
col you want, even if it's not IP (that's the multi-protocol thing), for MP=
LS networks where RTT is guaranteed by an SLA (just like your corporate LAN=
). Maybe we need to invent a different word for a virtual private network t=
hat actually provides privacy.

> Regarding marketing, I hear that beer makes me smarter and cigarettes mor=
e sophisticated as well.

That's confusing cause and effect. It's not that cigarettes make you sophis=
ticated, it's that it takes a sophisticated person to hold a fire in your m=
outh without getting burned. As for beer, I thought IETF meetings were abou=
t converting beer into specs.

Yoav


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From: Nicholas Weaver <nweaver@ICSI.Berkeley.EDU>
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Date: Thu, 17 Oct 2013 08:47:47 -0700
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References: <525475AA.2010907@cs.tcd.ie>	<525590CC.4030505@bbn.com>	<5255EC1D.5040006@cs.tcd.ie>	<5256F6CD.4090508@bbn.com>	<5256FB71.8040903@cs.tcd.ie>	<525722C4.4020408@bbn.com>	<5C28CCD5-4B7D-4BFB-94F4-1C33E43BDCD7@cdt.org>	<525BE7DC.4080407@gmail.com>	<95859161-25E3-45BC-A5C2-B3C548FB2417@acm.org>	<525C031B.5030100@bbn.com>	<525C2099.6010307@cs.tcd.ie> <525C2C44.2070404@bbn.com> <525C8130.2000606@cs.tcd.ie> <525D183E.7000200@cs.tcd.ie> <525EAF77.3090203@bbn.com> <989619D4-FCB3-4DF4-A4DB-C8864D2155D0@icsi.berkeley.edu> <525EE96F.4020901@bbn.com> <0A4B1BCB-81FC-4EFF-88CD-D6C496C0847F@ICSI.Berkeley.EDU> <525FFB12.6030306@bbn.com>
To: Stephen Kent <kent@bbn.com>
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Cc: perpass@ietf.org, Nicholas Weaver <nweaver@ICSI.Berkeley.EDU>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 17, 2013, at 7:58 AM, Stephen Kent <kent@bbn.com> wrote:
>> Capability wise, there is nothing except cryptographic data integrity =
that prevents an eavesdropper from injecting their own traffic.  On =
HTTP, this enables redirecting the browser to an arbitrary site (for =
exploitation), extracting any not-SSL-only cookies, injecting arbitrary =
code at the end of a web page, etc.  Absent DNSSEC validation on the =
part of the victim, DNS injection allows the attacker to MITM any =
connection.

> The ability to effect active and passive attacks is not uniform, and =
often not equivalent,
> at least not on a per link basis. An attacker may be able to listen to =
a satellite down link or
> a fiber cable, but not be able to inject packets into these links.

Thanks to an ability to spoof packets from a gazillion different =
locations, as long as they can inject a spoofed packet from ANOTHER link =
in time, they will still be able to do packet injection.  The attacker's =
point of injection needs to be closer (latency wise) on the network than =
the final destination of the packet, but thats usually a pretty easy =
constraint to meet.


> So it is not quite accurate
> to assert that any adversary who can passively monitor (a link) can =
also engage in active attacks
> (on that link). The general form of active attacks that we usually =
assume in IETF security assesments
> are MITM, which may be very hard to effect, depending on the context.

If you are assuming MITM on a packet level rather than just an =
eavesdropper (man on the side), then it really is a full-active attack =
is just a matter of willingness to do so, since a full MitM can drop =
packets as well.

>> Similarly, at layer 2, absent significant protection in the switch, =
properly configured, both DHCP and ARP injection allows similar total =
hijacking.  There are no capability limitations of note for a "passive" =
eavesdropper who wants to become active.
> What constitutes "significant protection?"

Configurations like this:

=
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/confi=
guration/guide/dynarp.html

=
http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisp=
lay/?sp4ts.oid=3D1827663&spf_p.tpst=3DkbDocDisplay&spf_p.prp_kbDocDisplay=3D=
wsrp-navigationalState%3DdocId%253Demr_na-c02609533-1%257CdocLocale%253D%2=
57CcalledBy%253D&javax.portlet.begCacheTok=3Dcom.vignette.cachetoken&javax=
.portlet.endCacheTok=3Dcom.vignette.cachetoken

for ARP, and similar configurations for DHCP.


For the wireless "LAN", the problem is even worse, unless you deploy =
something like this:
meraki.cisco.com/lib/pdf/meraki_datasheet_airmarshal.pdf=E2=80=8E

you have to assume that the attackers can do all sorts of fun things if =
they know the password/can authenticate, such as spoofing an AP and =
relaying traffic.


For both cases, this requires reasonably high end switches and almost =
invariably require that they be properly configured.   Thus it is =
foolish to assume, in developing and deploying protocols, that the =
network does NOT suffer from man-in-the-middle attackers, even when you =
are "just in the LAN".


>> Thus it really is "will" as convenient shorthand: is the attacker =
willing to use this and chance getting caught if a subtle detector is =
actually looking for the signs of attack?
> I think it is more than just a concern re being detected.

Why?  Since its clear that there aren't technical limitations on an =
eavesdropper becoming a full MitM in most cases, its really is only =
"does becoming a full MitM benefit me as an attacker vs any increased =
risk of detection".

> When you mention integrity do you mean integrity w/o authentication? =
To me that's reminiscent of
> the Rocky and Bullwinkle ad cut-away about fan mail from a flounder. =
If a bottle containing a note
> were securely sealed, then one might assume that it was afforded =
integrity. But without authentication,
> we don't know which flounder sent the note, which seems unsatisfying. =
Integrity w/o authentication
> is MUCH easier than authenticated integrity, but I worry that folks =
will misinterpret the security
> they're getting, with unfortunate results.

You need full authentication of all data and communication, so sorry for =
being unclear.



--
Nicholas Weaver                  it is a tale, told by an idiot,
nweaver@icsi.berkeley.edu                full of sound and fury,
510-666-2903                                 .signifying nothing
PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub.asc


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From ned+perpass@mrochek.com  Thu Oct 17 12:35:54 2013
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From: ned+perpass@mrochek.com
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Date: Thu, 17 Oct 2013 07:51:26 -0700 (PDT)
In-reply-to: "Your message dated Wed, 16 Oct 2013 01:30:53 +0100" <525DDE3D.6020500@cs.tcd.ie>
References: <525475AA.2010907@cs.tcd.ie> <525590CC.4030505@bbn.com> <5255EC1D.5040006@cs.tcd.ie> <5256F6CD.4090508@bbn.com> <5256FB71.8040903@cs.tcd.ie> <525722C4.4020408@bbn.com> <5C28CCD5-4B7D-4BFB-94F4-1C33E43BDCD7@cdt.org> <525BE7DC.4080407@gmail.com> <95859161-25E3-45BC-A5C2-B3C548FB2417@acm.org> <525C031B.5030100@bbn.com> <525C2099.6010307@cs.tcd.ie> <525C2C44.2070404@bbn.com> <525C8130.2000606@cs.tcd.ie> <525D183E.7000200@cs.tcd.ie> <01OZM7M57NWK00004R@mauve.mrochek.com> <525DDE3D.6020500@cs.tcd.ie>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Cc: ned+perpass@mrochek.com, perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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> Hiya,

> Many snippets below...

> On 10/15/2013 07:13 PM, ned+perpass@mrochek.com wrote:
> >> Following up on my own point - not stylish but I think
> >> in this case justified:-)
> >
> >> On 10/15/2013 12:41 AM, Stephen Farrell wrote:
> >>> I don't
> >>> see why we shouldn't be equally comfortable in saying "don't
> >>> send cleartext" - *if* that's an IETF consensus position - as
> >>> we have seen sending cleartext is also just broken when one
> >>> consideres pervasive monitoring.
> >
> >> I guess this Washington Post story [1] that I saw this
> >> morning would appear to provide a relevant example.
> >> In that case, I would argue that the fact that cleartext
> >> IMAP provides interop and is successful does imply that
> >> some services somewhere will use that for large populations
> >> that will inevitably (as we now know) be subject to
> >> pervasive monitoring.
> >
> > What is this "cleartext IMAP" of which you speak?

> I guess that's a fair comment - we don't know that they're
> able gather to inbox data via IMAP due to it being sent in
> clear,  however that seems like a reasonable guess based
> on the newspaper story which says that collection is done
> by telcos that are "overseas" and assuming that TLS is not
> busted for these services.

Actually, it's exactly the opposite: Details from the article make it very
unlikely that tapping into IMAP sessions is a significant source of data here.
In particular, both the article and the source material make it very clear that
this is primarily about address book information and only secondarily about
actual message content. As I noted previously IMAP does not carry address book
information.

Additionally, there's the peculiar use of the term "inbox" rather than to email
messages in general. IMAP provides access to all folders, whereas protocols
like ActiveSync are used specifically to notify users of the presence of new
messages in their inbox.

And as I noted previously, the peculiarly isolated IMAP slide at the  end is
not evidence of anything because we lack context. For all we know it was
included as an example of a case where collection is particularly difficult.

> (Even were TLS busted for those
> services though, I don't think that changes so much of the
> analysis *if* one can separately mitigate whatever's gone
> wrong with those TLS deployments.)

> But yes, that's guessing and we need to keep that in mind
> and there could well be alternative explanations.

Explanations that appear to me to fit the available information a lot 
better than yours does.

> > A quick check of some of the
> > major US MSPs shows that Gmail, Hotmail, and Apple all require SSL/TLS for
> > IMAP. And AOL definitely offers SSL/TLS support, but I can't tell if they
> > require it or not.
> >
> > Now, it seems to me like I'm missing one ... it's on the tip of my tongue ...
> > oh yeah, that would be Yahoo, the only vendor actually mentioned by name in the
> > Powerpoint slides the Washington Post story you cite is based on. But lo and
> > behold, they also require SSL for all IMAP access!
> >
> > I haven't bothered to survey ISPs (although I will note that Verizon and
> > several others only offers POP, not IMAP, and yes, they do offer SSL with
> > that), but my sense is most of them support SSL/TLS and many even require it.

> Is there publicly available information about the deployment of IMAP
> in terms of how many servers/services allow or disallow cleartext,
> STARTTLS or 993? (To expose my ignorance, yes, I did assume that many
> services still allow IMAP over 143 without STARTTLS in addition to
> 993.)

I doubt it, but even if such information were available it would be irrelevant
to the matter at hand. Once more you're failing to take into account how email
is actually deployed these days. For better or worse, email has seen a huge
degree of centralization: The overwhelming majority of email now resides on a
fairly small number of server farms. If your concern in protecting the accesses
done by the majority of email users, those are the servers that count, not the
one I have at home or the one operated by my (tiny) ISP.

The state of play for those servers is actually pretty easy to quantify, and
I'll do that in a followup message.

> >> When the numbers involved ("500,000 buddylists and
> >> inboxes" collected on a "representative day" for just
> >> one agency) are at that scale, then it seems to me that
> >> one can fairly describe that as a failure in protocol
> >> design and not solely as a bad deployment choice.
> >
> > And again I have to ask: What is the "protocol design failure" of which you
> > speak?

> Basically, having three flavours of IMAP (clear, STARTTLS and 993)
> where one that just mandated use of TLS could arguably be simpler
> and more secure.

More on this later.

> And note - I'm not saying this should've been
> done years ago, I'm asking if in a similar situation today we
> ought go for the one-with-security or the 3-flavoured approach.

First of all, IMAP is a less than ideal example because if we were doing it
today it would almost certainly be cast as a web service, and in that case it
would simply be another thing in the https/http space.

But if you ignore that little detail, I don't think you're going to like my
conclusions of the lessons learned from IMAP in particular and email in
general. My conclusionare that that most of the time the right things to do
are:

(1) Define the service on two ports, one with SSL/TLS covering the entire
    session and the other with no SSL/TLS option at all. (This makes the secure
    variant easy to deploying on connection-terminating load balancers, 
    which I believe is one of the driving factors behind the use of port 993.)

    There are going to be a few cases, like protocols that inherently deal
    with nothing but highly sensitive data, where specifying the insecure port
    variant should not be done. But not many.

    In contrast, there are *no* cases where the secure port should be omitted.
    I don't care if the protocol as designed only transfers public information.
    Protocols have a way of being used in ways their designers did not intend.

(2) Use the DNS in some way to announce which port a specific server expects
    connections to be on.

(3) Specify client latching semantics as a means to detect downgrade attacks.

(4) Think very hard and carefully about how certificate naming issues should
    be handled, and make sure your specification of them is both clear and
    complete.

(5) Think very hard and carefully about allowed/required ciphersuites and
    specify that very clearly and completely as well. (It is unclear to me
    whether this can be done for various classes of protocols versus on a
    case by case basis.)

(6) Do not design your protocol so that compliant operation depends on the
    use of SSL/TLS extensions or ciphersuites that aren't readily available
    in the various widely used crypto frameworks. And if this means there's
    some ugly wart in the protocol, so be it. (Note that this doesn't mean
    you call for implementation of the hoopy perfect forward secrecy scheme
    du jour, only that you can't depend on it.)

    That said, I think an exception needs to be made in the case of
    ciphersuites that employ rc4. I think rc4 is sufficiently problematic
    that its use needs to be discouraged even though that may make
    compliance difficult or even impossible in some cases.

(7) Since there are going to be choices to make when deploying, document
    those choices and their consequences clearly.

(8) The current fixed security considerations sections we currently employ
    are inadequate given how rapidly this stuff evolves. The IETF needs to
    develop a means of formally amending security considerations with
    additional information without having to open the entire document up
    for revision.

(9) Keep the use of normative references for purposes of specifying
    security to a minimum. And if this means some repetition of material,
    so be it.

Conspicuous by its abence on this list is any mention of anything being 
mandatory to use, and as few things as possible that would translate into
something being mandatory to implement. This is because I think history shows
that these sorts of IETF pronouncements - in the email world at least - have
been about as useful as pissing into a strong wind.

More generally, persuasion beats being doctrinaire hands down. Not to toot my
own horn or anything, but since Internet email a la RFC 821/RFC 822 deployed
we've managed to make exactly one really substantive change stick on a more or
less global basis. That was MIME, and we did it without a single mandate that
it be used. Instead we made it as compeling as we possibly could and we also
bent over backwards to make it as easy to deploy as possible.

> (Ignoring the rest of the message and just dealing with that
> would be fine from my pov if that helps.)

> > I'm especially interested in the one the IETF has made that exposes
> > buddy lists and address books.

> Address books? When did I mention those? I don't believe I did and
> if I did then that was in error. The buddylists things in the slides
> are also presumably not IMAP related.

That would be where you said:

    When the numbers involved ("500,000 buddylists and
    inboxes" collected on a "representative day" for just
    one agency) are at that scale, then it seems to me that
    one can fairly describe that as a failure in protocol
    design and not solely as a bad deployment choice.

And as I noted above, you can't divorce them from inbox data collection nearly
as easily as you seem to think.

> Lemme try another way: if IMAP were a brand new protocol
> today and given today's kit and network and what we've
> learned, would we argue to define both an insecure and
> a secure (but maybe not much used) variant or would we
> be better off only defining one version that builds in
> whatever we think is the right set of securiy features
> and ensures that those are used (by not having the
> option to not use 'em)?

See above. Again ignoring the fact that IMAP wouldn't be done in remotely
the same way if we were doing it today, the anwer is no, we'd almost
certainly still want to have an insecure variant.

> >> (*) Yes, there's a bit of arm-waving there since one
> >> can validly argue that the TLS ciphersuite that's MTI
> >> for 3501 is still just a bit too hard to deploy as
> >> one is supposed to get a server cert that the UA can
> >> verify, which implies some management overhead. So
> >> something slightly more easily deployed (and hence
> >> not quite 3501) might really be needed. But *how* to
> >> do MTU stuff could be a protocol-specific debate to
> >> have after we concluded we had consensus for
> >> more-than-MTI in some form. (Which we don't, today.)
> >> But of course, a new IMAP security BCP doesn't have
> >> to wait either (hint, hint:-)
> >
> > ... And that's a strawman. I've not heard and provider of any size make such an
> > argument in many, many, many years. The fact of the matter is that secure IMAP
> > *is* widely and successfully deployed, albeit in a way that the IETF did not
> > intend and in spite of the fact that the IETF did bugger-all to make it easy to
> > do.

> Yes - I think that supports my argument - the existence of a
> "pretend" security variant at day zero is damaging so we should
> ask whether we ought just make the security mandatory to use
> and end up with one version.

On the contrary, what's damaging on day zero is having a specification for
which compliance isn't practical for a significant fraction of implementors,
deployers, or both. This is what happened in the case of IMAP, and the result
was vendors ignored what the specifications called for and secured the protocol
in their own way. (And security isn't the only example of this in IMAP.)

> > And since only yesterday I was listening to a presentation that among other
> > things covered the specifics of how a provider with 10s of millions of users
> > handles this particular problem, I can state with some authority that the costs
> > aren't that big a deal.

> I don't get what you mean there.

You claimed that there are valid arguments that the TLS ciphersuites that are
MTI are too hard to deploy. AFAICT that claim is false.

> >
> > But if you really think it's worth spending the time to make IMAP security even
> > better, that's fine with me. But the work needs to be based on what's in play
> > in the real world, which seems markedly at odds with what you imagine is out
> > there.

> Disagree. But that (I hope) is because you misinterpreted what
> I'm asking/saying.

> > It also needs to be informed by what's actually possible given real
> > world constraints, e.g., what ciphersuites are actually offered by the SSL/TLS
> > libraries in common use.

> Yeah. There're similar issues for TLS in general.

> > (I've heard it mooted that support for anon-DH in
> > particular is likely to be dropped from some of them.)

> That's fair. I did acknowledge arm-waving though.

> > And finally,
> > expectations as to what this will actually accomoplish in terms of thwaring
> > pervasive surveilance need to be lowered pretty dramatically.

> Why? And even if so, it may be worth doing as proection
> against other bad actors.

Because given the way email actually works this may well be a case of putting
bars on the barn windows while leaving the door unlocked.

> > But more generally - and I'm afraid I'm going to be a bit unkind here - there's
> > way too much yacketing about non-issues and completely impractical
> > non-solutions going on here, at least when it comes to securing the
> > bulk of present-day email.

> I think that's not unkind but is unfair. (Given that I think
> you yacketed about address books above for example.)

You need to reread your own original message as well as the material in the
slides before making any such claim.

> > So I'm once again going to ask, "What's the goal here?". If the goal is to make
> > the email of select group of cognescenti more secure that's one thing. It's
> > quite another to talk seriously about improving email security for everyone
> > else.
> >
> > If we're going to do the latter, I'm afraid that needs to start with a better
> > understanding of what present-day email service actually looks like and where
> > market trends are pushing it.

> Better understanding is always good and the main goal here (at least
> mine) is to make pervasive monitoring more expensive to the extent
> technically feasible. Personally, I think there are things about IMAP
> that could be impoved but I'm very skeptical that we can "solve" the
> problem for mail in general. (Some others on this list are more
> optimistic.)

You're still not answering the question, at least directly, and I really want a
direct answer. More expensive for whom? The vast majority of current and likely
future email users, who seem perfectly happy to use the service offerings of
large ISPs and MSPs? If so, then any proposal you come up with needs to done in
a way that persuades those providers that making changes to their service
offerings is the right thing for them to do.

				Ned

From stephen.farrell@cs.tcd.ie  Thu Oct 17 14:53:55 2013
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Some bits snipped out...

On 10/17/2013 03:51 PM, ned+perpass@mrochek.com wrote:
> 
>> Hiya,
> 
>> Many snippets below...
> 
>> On 10/15/2013 07:13 PM, ned+perpass@mrochek.com wrote:
>>>> Following up on my own point - not stylish but I think
>>>> in this case justified:-)
>>>
>>>> On 10/15/2013 12:41 AM, Stephen Farrell wrote:
>>>>> I don't
>>>>> see why we shouldn't be equally comfortable in saying "don't
>>>>> send cleartext" - *if* that's an IETF consensus position - as
>>>>> we have seen sending cleartext is also just broken when one
>>>>> consideres pervasive monitoring.
>>>
>>>> I guess this Washington Post story [1] that I saw this
>>>> morning would appear to provide a relevant example.
>>>> In that case, I would argue that the fact that cleartext
>>>> IMAP provides interop and is successful does imply that
>>>> some services somewhere will use that for large populations
>>>> that will inevitably (as we now know) be subject to
>>>> pervasive monitoring.
>>>
>>> What is this "cleartext IMAP" of which you speak?
> 
>> I guess that's a fair comment - we don't know that they're
>> able gather to inbox data via IMAP due to it being sent in
>> clear,  however that seems like a reasonable guess based
>> on the newspaper story which says that collection is done
>> by telcos that are "overseas" and assuming that TLS is not
>> busted for these services.
> 
> Actually, it's exactly the opposite: Details from the article make it very
> unlikely that tapping into IMAP sessions is a significant source of data here.
> In particular, both the article and the source material make it very clear that
> this is primarily about address book information and only secondarily about
> actual message content. As I noted previously IMAP does not carry address book
> information.

So you're interpreting "inbox" to mean address book. To be
honest, I'm not convinced by that.

That's not how I read it - I do interpret inbox to mean
inbox, primarily mail accessed via imap or webmail.

> Additionally, there's the peculiar use of the term "inbox" rather than to email
> messages in general. IMAP provides access to all folders, whereas protocols
> like ActiveSync are used specifically to notify users of the presence of new
> messages in their inbox.
> 
> And as I noted previously, the peculiarly isolated IMAP slide at the  end is
> not evidence of anything because we lack context. For all we know it was
> included as an example of a case where collection is particularly difficult.

I agree it stands out from the others and is hard to interpret.
I don't think inbox is hard to intepret at all though.

>> Is there publicly available information about the deployment of IMAP
>> in terms of how many servers/services allow or disallow cleartext,
>> STARTTLS or 993? (To expose my ignorance, yes, I did assume that many
>> services still allow IMAP over 143 without STARTTLS in addition to
>> 993.)
> 
> I doubt it, but even if such information were available it would be irrelevant
> to the matter at hand. Once more you're failing to take into account how email
> is actually deployed these days. For better or worse, email has seen a huge
> degree of centralization: The overwhelming majority of email now resides on a
> fairly small number of server farms. If your concern in protecting the accesses
> done by the majority of email users, those are the servers that count, not the
> one I have at home or the one operated by my (tiny) ISP.

Protecting the majority of email users is not the same issue. Its
also a fine thing but slightly different, see the end.

> The state of play for those servers is actually pretty easy to quantify, and
> I'll do that in a followup message.
> 
>>>> When the numbers involved ("500,000 buddylists and
>>>> inboxes" collected on a "representative day" for just
>>>> one agency) are at that scale, then it seems to me that
>>>> one can fairly describe that as a failure in protocol
>>>> design and not solely as a bad deployment choice.
>>>
>>> And again I have to ask: What is the "protocol design failure" of which you
>>> speak?
> 
>> Basically, having three flavours of IMAP (clear, STARTTLS and 993)
>> where one that just mandated use of TLS could arguably be simpler
>> and more secure.
> 
> More on this later.
> 
>> And note - I'm not saying this should've been
>> done years ago, I'm asking if in a similar situation today we
>> ought go for the one-with-security or the 3-flavoured approach.
> 
> First of all, IMAP is a less than ideal example because if we were doing it
> today it would almost certainly be cast as a web service, and in that case it
> would simply be another thing in the https/http space.
> 
> But if you ignore that little detail, I don't think you're going to like my
> conclusions of the lessons learned from IMAP in particular and email in
> general. 

I don't dislike 'em actually. Most seem reasonable.

> My conclusionare that that most of the time the right things to do
> are:
> 
> (1) Define the service on two ports, one with SSL/TLS covering the entire
>     session and the other with no SSL/TLS option at all. (This makes the secure
>     variant easy to deploying on connection-terminating load balancers, 
>     which I believe is one of the driving factors behind the use of port 993.)

That's the bit I'm questioning. I figure that if we could do
just the secure one, then we'd be done and that'd be a better
approach than having two. I also think that if we muck up and
do a pretend job on security then we end up with 3: plain,
pretend-secure and eventually-fixed-secure. That's happened
with more than IMAP.

I don't know if only doing the secure one in an IETF context
is at all likely though. History would seem to show that its
not. OTOH, it is true that doing the secure versions is much
better understood now and much more practical than it was a
decade ago, so I think its worth exploring.

> 
>     There are going to be a few cases, like protocols that inherently deal
>     with nothing but highly sensitive data, where specifying the insecure port
>     variant should not be done. But not many.

Yep. And some cases like DHCP where its just hard to do
meaningful (crypto) security.

> 
>     In contrast, there are *no* cases where the secure port should be omitted.
>     I don't care if the protocol as designed only transfers public information.
>     Protocols have a way of being used in ways their designers did not intend.
> 
> (2) Use the DNS in some way to announce which port a specific server expects
>     connections to be on.
> 
> (3) Specify client latching semantics as a means to detect downgrade attacks.
> 
> (4) Think very hard and carefully about how certificate naming issues should
>     be handled, and make sure your specification of them is both clear and
>     complete.
> 
> (5) Think very hard and carefully about allowed/required ciphersuites and
>     specify that very clearly and completely as well. (It is unclear to me
>     whether this can be done for various classes of protocols versus on a
>     case by case basis.)
> 
> (6) Do not design your protocol so that compliant operation depends on the
>     use of SSL/TLS extensions or ciphersuites that aren't readily available
>     in the various widely used crypto frameworks. And if this means there's
>     some ugly wart in the protocol, so be it. (Note that this doesn't mean
>     you call for implementation of the hoopy perfect forward secrecy scheme
>     du jour, only that you can't depend on it.)
> 
>     That said, I think an exception needs to be made in the case of
>     ciphersuites that employ rc4. I think rc4 is sufficiently problematic
>     that its use needs to be discouraged even though that may make
>     compliance difficult or even impossible in some cases.
> 
> (7) Since there are going to be choices to make when deploying, document
>     those choices and their consequences clearly.
> 
> (8) The current fixed security considerations sections we currently employ
>     are inadequate given how rapidly this stuff evolves. The IETF needs to
>     develop a means of formally amending security considerations with
>     additional information without having to open the entire document up
>     for revision.
> 
> (9) Keep the use of normative references for purposes of specifying
>     security to a minimum. And if this means some repetition of material,
>     so be it.

I think I'd agree with almost all of (2)-(9).

> Conspicuous by its abence on this list is any mention of anything being 
> mandatory to use, and as few things as possible that would translate into
> something being mandatory to implement. This is because I think history shows
> that these sorts of IETF pronouncements - in the email world at least - have
> been about as useful as pissing into a strong wind.

I agree about pronouncements. But I also think we might be able
to do better than we're doing now without 'em.

> More generally, persuasion beats being doctrinaire hands down. Not to toot my
> own horn or anything, but since Internet email a la RFC 821/RFC 822 deployed
> we've managed to make exactly one really substantive change stick on a more or
> less global basis. That was MIME, and we did it without a single mandate that
> it be used. Instead we made it as compeling as we possibly could and we also
> bent over backwards to make it as easy to deploy as possible.
> 
>> (Ignoring the rest of the message and just dealing with that
>> would be fine from my pov if that helps.)
> 
>>> I'm especially interested in the one the IETF has made that exposes
>>> buddy lists and address books.
> 
>> Address books? When did I mention those? I don't believe I did and
>> if I did then that was in error. The buddylists things in the slides
>> are also presumably not IMAP related.
> 
> That would be where you said:
> 
>     When the numbers involved ("500,000 buddylists and
>     inboxes" collected on a "representative day" for just
>     one agency) are at that scale, then it seems to me that
>     one can fairly describe that as a failure in protocol
>     design and not solely as a bad deployment choice.
> 
> And as I noted above, you can't divorce them from inbox data collection nearly
> as easily as you seem to think.

As per above. I don't find that convincing.

> 
>> Lemme try another way: if IMAP were a brand new protocol
>> today and given today's kit and network and what we've
>> learned, would we argue to define both an insecure and
>> a secure (but maybe not much used) variant or would we
>> be better off only defining one version that builds in
>> whatever we think is the right set of securiy features
>> and ensures that those are used (by not having the
>> option to not use 'em)?
> 
> See above. Again ignoring the fact that IMAP wouldn't be done in remotely
> the same way if we were doing it today, the anwer is no, we'd almost
> certainly still want to have an insecure variant.

Why? Serious question.

> 
>>>> (*) Yes, there's a bit of arm-waving there since one
>>>> can validly argue that the TLS ciphersuite that's MTI
>>>> for 3501 is still just a bit too hard to deploy as
>>>> one is supposed to get a server cert that the UA can
>>>> verify, which implies some management overhead. So
>>>> something slightly more easily deployed (and hence
>>>> not quite 3501) might really be needed. But *how* to
>>>> do MTU stuff could be a protocol-specific debate to
>>>> have after we concluded we had consensus for
>>>> more-than-MTI in some form. (Which we don't, today.)
>>>> But of course, a new IMAP security BCP doesn't have
>>>> to wait either (hint, hint:-)
>>>
>>> ... And that's a strawman. I've not heard and provider of any size make such an
>>> argument in many, many, many years. The fact of the matter is that secure IMAP
>>> *is* widely and successfully deployed, albeit in a way that the IETF did not
>>> intend and in spite of the fact that the IETF did bugger-all to make it easy to
>>> do.
> 
>> Yes - I think that supports my argument - the existence of a
>> "pretend" security variant at day zero is damaging so we should
>> ask whether we ought just make the security mandatory to use
>> and end up with one version.
> 
> On the contrary, what's damaging on day zero is having a specification for
> which compliance isn't practical for a significant fraction of implementors,
> deployers, or both. This is what happened in the case of IMAP, and the result
> was vendors ignored what the specifications called for and secured the protocol
> in their own way. (And security isn't the only example of this in IMAP.)

I agree that that happened and was damaging. I don't thinks its
at all contrary to what I said.

> 
>>> And since only yesterday I was listening to a presentation that among other
>>> things covered the specifics of how a provider with 10s of millions of users
>>> handles this particular problem, I can state with some authority that the costs
>>> aren't that big a deal.
> 
>> I don't get what you mean there.
> 
> You claimed that there are valid arguments that the TLS ciphersuites that are
> MTI are too hard to deploy. AFAICT that claim is false.

I do think that the PKI parts are too hard to deploy. Not for
the larger MSPs, but it could be a good bit easier. Or maybe
you're the one person in the universe who thinks that deploying
PKI is a doddle:-)

>>> So I'm once again going to ask, "What's the goal here?". If the goal is to make
>>> the email of select group of cognescenti more secure that's one thing. It's
>>> quite another to talk seriously about improving email security for everyone
>>> else.
>>>
>>> If we're going to do the latter, I'm afraid that needs to start with a better
>>> understanding of what present-day email service actually looks like and where
>>> market trends are pushing it.
> 
>> Better understanding is always good and the main goal here (at least
>> mine) is to make pervasive monitoring more expensive to the extent
>> technically feasible. Personally, I think there are things about IMAP
>> that could be impoved but I'm very skeptical that we can "solve" the
>> problem for mail in general. (Some others on this list are more
>> optimistic.)
> 
> You're still not answering the question, at least directly, and I really want a
> direct answer. More expensive for whom?

Ah sorry. I think the goal here is to make pervasive monitoring
more expensive for anyone (govt or other) who wants to do that,
in cases where we think we can create a maybe significant enough
disencentive, but without making things harder for people who're
using protocols as designed. There will be some tradeoffs there
for sure, but in some cases if we get consensus for changes then
we might actually improve things for the normal users too.

The first part of that is new to the extent that we're dealing
with a new threat model. If we can do something for that, then
my hope is that we can improve general security and usabiliy as
well, since we've learned a good bit about that (or should have)
in the last decade.

> The vast majority of current and likely
> future email users, who seem perfectly happy to use the service
offerings of
> large ISPs and MSPs? If so, then any proposal you come up with needs
to done in
> a way that persuades those providers that making changes to their service
> offerings is the right thing for them to do.

That's fair.

S.


> 
> 				Ned
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

From hallam@gmail.com  Thu Oct 17 15:12:39 2013
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From: Phillip Hallam-Baker <hallam@gmail.com>
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Subject: [perpass] PRISM-Proof Email, Key Management and Publication Specification
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--089e01182d9e896e2a04e8f71d05
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I have produced a first draft of the specification for the Key Publication
service and key management tool that talks to it.

The code being documented is rough. Not least because the ASN.1 encoder I
wrote does not know about ASN.1 inanities like OPTIONAL, IMPLICIT or such
yet so the certs are not DER encoded.

http://tools.ietf.org/html/draft-hallambaker-prismproof-key-00


This specification represents one of the two interfaces to the blob in the
cloud that I call 'research'. We don't yet know the best approach to trust
management but it is going to be a lot easier to find out if we separate
that hard research problem from the 'plumbing' required to make secure
email work.

The other interface is the Omnibroker specification I wrote earlier this
year.

http://tools.ietf.org/html/draft-hallambaker-httpsession-01
http://tools.ietf.org/html/draft-hallambaker-wsconnect-04
http://tools.ietf.org/html/draft-hallambaker-omnibroker-06


I believe that between these specifications we have a fairly complete idea
of what the 'plumbing' side of 'Privacy Protected' Email should look like.

The Strong Email Addresses shown earlier provide a demonstration that we
can solve this problem for at least some class of email user using stock
email clients (OK plus a proxy gateway to send the mail).

If people would like to write code, we are at the point where that is now
practical. In addition it would be very useful if people could find out
information such as how various commonly used email clients store S/MIMe
keys and how might a program do the user's job of configuration for them.

-- 
Website: http://hallambaker.com/

--089e01182d9e896e2a04e8f71d05
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">I have produced a first draft of the specification for the=
 Key Publication service and key management tool that talks to it.<div><br>=
</div><div>The code being documented is rough. Not least because the ASN.1 =
encoder I wrote does not know about ASN.1 inanities like OPTIONAL, IMPLICIT=
 or such yet so the certs are not DER encoded.</div>
<div><br clear=3D"all"><div><a href=3D"http://tools.ietf.org/html/draft-hal=
lambaker-prismproof-key-00">http://tools.ietf.org/html/draft-hallambaker-pr=
ismproof-key-00</a><br></div><div><br></div><div><br></div><div>This specif=
ication represents one of the two interfaces to the blob in the cloud that =
I call &#39;research&#39;. We don&#39;t yet know the best approach to trust=
 management but it is going to be a lot easier to find out if we separate t=
hat hard research problem from the &#39;plumbing&#39; required to make secu=
re email work.</div>
<div><br></div><div>The other interface is the Omnibroker specification I w=
rote earlier this year.</div><div><br></div><div><a href=3D"http://tools.ie=
tf.org/html/draft-hallambaker-httpsession-01">http://tools.ietf.org/html/dr=
aft-hallambaker-httpsession-01</a><br>
</div><div><a href=3D"http://tools.ietf.org/html/draft-hallambaker-wsconnec=
t-04">http://tools.ietf.org/html/draft-hallambaker-wsconnect-04</a><br></di=
v><div><a href=3D"http://tools.ietf.org/html/draft-hallambaker-omnibroker-0=
6">http://tools.ietf.org/html/draft-hallambaker-omnibroker-06</a><br>
</div><div><br></div><div><br></div><div>I believe that between these speci=
fications we have a fairly complete idea of what the &#39;plumbing&#39; sid=
e of &#39;Privacy Protected&#39; Email should look like.</div><div><br>
</div><div>The Strong Email Addresses shown earlier provide a demonstration=
 that we can solve this problem for at least some class of email user using=
 stock email clients (OK plus a proxy gateway to send the mail).</div><div>
<br></div><div>If people would like to write code, we are at the point wher=
e that is now practical. In addition it would be very useful if people coul=
d find out information such as how various commonly used email clients stor=
e S/MIMe keys and how might a program do the user&#39;s job of configuratio=
n for them.</div>
<div><br></div>-- <br>Website: <a href=3D"http://hallambaker.com/">http://h=
allambaker.com/</a><br>
</div></div>

--089e01182d9e896e2a04e8f71d05--

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From: Phillip Hallam-Baker <hallam@gmail.com>
To: perpass <perpass@ietf.org>
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Subject: [perpass] Fwd: PRISM-Proof Email, Key Management and Publication Specification
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--001a1133dba0f8874e04e8f8298b
Content-Type: text/plain; charset=ISO-8859-1

[Try #2]

I have produced a first draft of the specification for the Key Publication
service and key management tool that talks to it.

The code being documented is rough. Not least because the ASN.1 encoder I
wrote does not know about ASN.1 inanities like OPTIONAL, IMPLICIT or such
yet so the certs are not DER encoded.

http://tools.ietf.org/html/draft-hallambaker-prismproof-key-00


This specification represents one of the two interfaces to the blob in the
cloud that I call 'research'. We don't yet know the best approach to trust
management but it is going to be a lot easier to find out if we separate
that hard research problem from the 'plumbing' required to make secure
email work.

The other interface is the Omnibroker specification I wrote earlier this
year.

http://tools.ietf.org/html/draft-hallambaker-httpsession-01
http://tools.ietf.org/html/draft-hallambaker-wsconnect-04
http://tools.ietf.org/html/draft-hallambaker-omnibroker-06


I believe that between these specifications we have a fairly complete idea
of what the 'plumbing' side of 'Privacy Protected' Email should look like.

The Strong Email Addresses shown earlier provide a demonstration that we
can solve this problem for at least some class of email user using stock
email clients (OK plus a proxy gateway to send the mail).

If people would like to write code, we are at the point where that is now
practical. In addition it would be very useful if people could find out
information such as how various commonly used email clients store S/MIMe
keys and how might a program do the user's job of configuration for them.

-- 
Website: http://hallambaker.com/



-- 
Website: http://hallambaker.com/

--001a1133dba0f8874e04e8f8298b
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">[Try #2]<br><div class=3D"gmail_quote"><br><div dir=3D"ltr=
">I have produced a first draft of the specification for the Key Publicatio=
n service and key management tool that talks to it.<div><br></div><div>The =
code being documented is rough. Not least because the ASN.1 encoder I wrote=
 does not know about ASN.1 inanities like OPTIONAL, IMPLICIT or such yet so=
 the certs are not DER encoded.</div>

<div><br clear=3D"all"><div><a href=3D"http://tools.ietf.org/html/draft-hal=
lambaker-prismproof-key-00" target=3D"_blank">http://tools.ietf.org/html/dr=
aft-hallambaker-prismproof-key-00</a><br></div><div><br></div><div><br></di=
v>
<div>This specification represents one of the two interfaces to the blob in=
 the cloud that I call &#39;research&#39;. We don&#39;t yet know the best a=
pproach to trust management but it is going to be a lot easier to find out =
if we separate that hard research problem from the &#39;plumbing&#39; requi=
red to make secure email work.</div>

<div><br></div><div>The other interface is the Omnibroker specification I w=
rote earlier this year.</div><div><br></div><div><a href=3D"http://tools.ie=
tf.org/html/draft-hallambaker-httpsession-01" target=3D"_blank">http://tool=
s.ietf.org/html/draft-hallambaker-httpsession-01</a><br>

</div><div><a href=3D"http://tools.ietf.org/html/draft-hallambaker-wsconnec=
t-04" target=3D"_blank">http://tools.ietf.org/html/draft-hallambaker-wsconn=
ect-04</a><br></div><div><a href=3D"http://tools.ietf.org/html/draft-hallam=
baker-omnibroker-06" target=3D"_blank">http://tools.ietf.org/html/draft-hal=
lambaker-omnibroker-06</a><br>

</div><div><br></div><div><br></div><div>I believe that between these speci=
fications we have a fairly complete idea of what the &#39;plumbing&#39; sid=
e of &#39;Privacy Protected&#39; Email should look like.</div><div><br>

</div><div>The Strong Email Addresses shown earlier provide a demonstration=
 that we can solve this problem for at least some class of email user using=
 stock email clients (OK plus a proxy gateway to send the mail).</div>
<div>
<br></div><div>If people would like to write code, we are at the point wher=
e that is now practical. In addition it would be very useful if people coul=
d find out information such as how various commonly used email clients stor=
e S/MIMe keys and how might a program do the user&#39;s job of configuratio=
n for them.</div>
<span class=3D"HOEnZb"><font color=3D"#888888">
<div><br></div>-- <br>Website: <a href=3D"http://hallambaker.com/" target=
=3D"_blank">http://hallambaker.com/</a><br>
</font></span></div></div>
</div><br><br clear=3D"all"><div><br></div>-- <br>Website: <a href=3D"http:=
//hallambaker.com/">http://hallambaker.com/</a><br>
</div>

--001a1133dba0f8874e04e8f8298b--

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From: Douglas Otis <doug.mtview@gmail.com>
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References: <525475AA.2010907@cs.tcd.ie> <525590CC.4030505@bbn.com> <5255EC1D.5040006@cs.tcd.ie> <5256F6CD.4090508@bbn.com> <5256FB71.8040903@cs.tcd.ie> <525722C4.4020408@bbn.com> <5C28CCD5-4B7D-4BFB-94F4-1C33E43BDCD7@cdt.org> <525BE7DC.4080407@gmail.com> <95859161-25E3-45BC-A5C2-B3C548FB2417@acm.org> <525C031B.5030100@bbn.com> <525C2099.6010307@cs.tcd.ie> <525C2C44.2070404@bbn.com> <525C8130.2000606@cs.tcd.ie> <525D183E.7000200@cs.tcd.ie> <01OZM7M57NWK00004R@mauve.mrochek.com> <525DDE3D.6020500@cs.tcd.ie> <01OZOV9PPNIU00004R@mauve.mrochek.com>
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Cc: perpass <perpass@ietf.org>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 17, 2013, at 7:51 AM, ned+perpass@mrochek.com wrote:
> Stephen Farrell <stephen.farrell@cs.tcd.ie> on Oct 15, 2013 5:31PM =
wrote:
>> Better understanding is always good and the main goal here (at least
>> mine) is to make pervasive monitoring more expensive to the extent
>> technically feasible. Personally, I think there are things about IMAP
>> that could be impoved but I'm very skeptical that we can "solve" the
>> problem for mail in general. (Some others on this list are more
>> optimistic.)
>=20
> You're still not answering the question, at least directly, and I =
really want a
> direct answer. More expensive for whom? The vast majority of current =
and likely
> future email users, who seem perfectly happy to use the service =
offerings of
> large ISPs and MSPs? If so, then any proposal you come up with needs =
to done in
> a way that persuades those providers that making changes to their =
service
> offerings is the right thing for them to do.

Dear Ned,

Improving the efficiency of email acceptance might be this incentive.  =
As IPv6 becomes pervasive, an authenticated domain source as a basis is =
likely to be more sustainable over time.  Establishing expectations that =
StartTLS confirms both server and client certificates affords improved =
transactional protection from spoofing or reputation poisoning, =
especially with the transparency and economy afforded by DANE for =
protection from simple monitoring, malicious spoofing, and reputation =
poisoning.  Providers will need to be trustworthy and may need to reside =
in specific geopolitical regions willing to ensure such protections.

Multiple keying of encrypted data where each key subset resides in =
different geopolitical regions might be a way to increase trust, but =
this is not off-the-shelf crypto which you state as a requirement.

Regards,
Douglas Otis



From randy@psg.com  Thu Oct 17 21:50:31 2013
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Subject: Re: [perpass] When private is equated with secure (was: mandatory-to-implement vs. more?)
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> "IP VPN" includes not only MPLS VPN

the vpn without a p

From dhc@dcrocker.net  Thu Oct 17 22:01:54 2013
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Cc: joel jaeggli <joelja@bogus.com>, perpass <perpass@ietf.org>, Stephen Kent <kent@bbn.com>, Mark Atwood <me@mark.atwood.name>
Subject: Re: [perpass] When private is equated with secure
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On 10/18/2013 12:52 AM, Scott Brim wrote:
> On Oct 17, 2013 2:45 AM, "SM" <sm@resistor.net <mailto:sm@resistor.net>>
> wrote:
>  > If I am not mistaken IP VPN has been sold over the years as a secure
> link.
>
> "IP VPN" includes not only MPLS VPN but also e2e IPsec. Also the meaning
> of "secure" has been diluted down by marketing.


The words "secure" and "security" have long lost any technical meaning. 
  Today they are useful only as umbrella terms as referencing an area of 
effort, not an actual capability.  So "working on security" rather than 
"producing security".

Unfortunately, 'privacy' also lacks any serious technical meaning, since 
even the IAB was not willing to define it in their RFC.  Hence the term 
means whatever the speaker wants it to mean, which might not be what the 
listener understands it to mean.


So if someone wants to assert the presence or need for some sort of 
security-related functionality, they need to use terminology that is 
universally understood to be precise.

For this thread, I suspect what is mean is IP-layer Confidentiality, 
which is e2e only if the application layer doesn't have any hops, where 
the content will be in the clear during the relaying.  Like with email 
MTAs, or Web caches...

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

From acooper@cdt.org  Fri Oct 18 03:49:10 2013
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Oct 17, 2013, at 10:51 AM, ned+perpass@mrochek.com wrote:

>=20
>> Hiya,
>=20
>> Many snippets below...
>=20
>> On 10/15/2013 07:13 PM, ned+perpass@mrochek.com wrote:
>>>> Following up on my own point - not stylish but I think
>>>> in this case justified:-)
>>>=20
>>>> On 10/15/2013 12:41 AM, Stephen Farrell wrote:
>>>>> I don't
>>>>> see why we shouldn't be equally comfortable in saying "don't
>>>>> send cleartext" - *if* that's an IETF consensus position - as
>>>>> we have seen sending cleartext is also just broken when one
>>>>> consideres pervasive monitoring.
>>>=20
>>>> I guess this Washington Post story [1] that I saw this
>>>> morning would appear to provide a relevant example.
>>>> In that case, I would argue that the fact that cleartext
>>>> IMAP provides interop and is successful does imply that
>>>> some services somewhere will use that for large populations
>>>> that will inevitably (as we now know) be subject to
>>>> pervasive monitoring.
>>>=20
>>> What is this "cleartext IMAP" of which you speak?
>=20
>> I guess that's a fair comment - we don't know that they're
>> able gather to inbox data via IMAP due to it being sent in
>> clear,  however that seems like a reasonable guess based
>> on the newspaper story which says that collection is done
>> by telcos that are "overseas" and assuming that TLS is not
>> busted for these services.
>=20
> Actually, it's exactly the opposite: Details from the article make it =
very
> unlikely that tapping into IMAP sessions is a significant source of =
data here.
> In particular, both the article and the source material make it very =
clear that
> this is primarily about address book information and only secondarily =
about
> actual message content. As I noted previously IMAP does not carry =
address book
> information.
>=20
> Additionally, there's the peculiar use of the term "inbox" rather than =
to email
> messages in general. IMAP provides access to all folders, whereas =
protocols
> like ActiveSync are used specifically to notify users of the presence =
of new
> messages in their inbox.


Disclosures about inboxes and individual messages were part of earlier =
revelations/declassification:

=
https://www.eff.org/document/october-3-2011-fisc-opinion-holding-nsa-surve=
illance-unconstitutional
=
https://www.eff.org/deeplinks/2013/08/intelligence-agency-attorney-explain=
s-how-multi-communication-transactions-allowed
=
https://www.cdt.org/blogs/alissa-cooper/1109nsa%E2%80%99s-laziness-masquer=
ading-reasonableness

Alissa


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From ned+perpass@mrochek.com  Fri Oct 18 11:02:47 2013
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To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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> > Actually, it's exactly the opposite: Details from the article make it very
> > unlikely that tapping into IMAP sessions is a significant source of data here.
> > In particular, both the article and the source material make it very clear that
> > this is primarily about address book information and only secondarily about
> > actual message content. As I noted previously IMAP does not carry address book
> > information.

> So you're interpreting "inbox" to mean address book. To be
> honest, I'm not convinced by that.

Of course I'm not interpreting it that way. Inbox has a very specific
and well defined meaning in email - the place where messages are delivered
to the user by default - and I'm using that definition.

> That's not how I read it - I do interpret inbox to mean
> inbox, primarily mail accessed via imap or webmail.

Of course that is what it means. But I'm starting to wonder whether or not
we're reading the same article. There's only one reference to acquisition
of mail message content in the one I'm reading, which says:

  Each day, the presentation said, the NSA collects contacts from an estimated
  500,000 buddy lists on live-chat services as well as from the inbox displays
  of Web-based e-mail accounts.

I'm not going to bother quoting the correponding material on the actual slides
because I'd have to retype it, but it absolutely backs up this paragraph.

Clearly the inbox information is coming from web mail. And the way modern web
mail works is a big wad of Javascript gets  downloaded to the browser, which
then communicates with the back end server by exchanging JSON, XML, HTML,
whatever with a back end server. The client state, to the extent there is any,
is jointly maintained by the front and back ends.

The web mail server (which may consist of multiple server layers, proxies,
caches, separate authentication servers, and who knows what else) then talks to
the actual message store. In many cases this is done in a proprietary fashion.
And if IMAP is used, those IMAP connections are happening within the data
center, not on the open Internet. Even if the connections travel from
one data center to another (the use-case for that would be shared folder
access, which by definition is not going to be your inbox), that's going
to be done on a private network, if for no other reason than to avoid timeout
issues.

And as I noted before, ActiveSync may play a role here, although I'm not
familiar enough with the use cases for it to be sure.

> > Additionally, there's the peculiar use of the term "inbox" rather than to email
> > messages in general. IMAP provides access to all folders, whereas protocols
> > like ActiveSync are used specifically to notify users of the presence of new
> > messages in their inbox.
> >
> > And as I noted previously, the peculiarly isolated IMAP slide at the  end is
> > not evidence of anything because we lack context. For all we know it was
> > included as an example of a case where collection is particularly difficult.

> I agree it stands out from the others and is hard to interpret.
> I don't think inbox is hard to intepret at all though.

It isn't. But you appear to have not considered the context in which it was
used.

> > The state of play for those servers is actually pretty easy to quantify, and
> > I'll do that in a followup message.
> >
> >>>> When the numbers involved ("500,000 buddylists and
> >>>> inboxes" collected on a "representative day" for just
> >>>> one agency) are at that scale, then it seems to me that
> >>>> one can fairly describe that as a failure in protocol
> >>>> design and not solely as a bad deployment choice.
> >>>
> >>> And again I have to ask: What is the "protocol design failure" of which you
> >>> speak?
> >
> >> Basically, having three flavours of IMAP (clear, STARTTLS and 993)
> >> where one that just mandated use of TLS could arguably be simpler
> >> and more secure.
> >
> > More on this later.
> >
> >> And note - I'm not saying this should've been
> >> done years ago, I'm asking if in a similar situation today we
> >> ought go for the one-with-security or the 3-flavoured approach.
> >
> > First of all, IMAP is a less than ideal example because if we were doing it
> > today it would almost certainly be cast as a web service, and in that case it
> > would simply be another thing in the https/http space.
> >
> > But if you ignore that little detail, I don't think you're going to like my
> > conclusions of the lessons learned from IMAP in particular and email in
> > general.

> I don't dislike 'em actually. Most seem reasonable.

> > My conclusionare that that most of the time the right things to do
> > are:
> >
> > (1) Define the service on two ports, one with SSL/TLS covering the entire
> >     session and the other with no SSL/TLS option at all. (This makes the secure
> >     variant easy to deploying on connection-terminating load balancers,
> >     which I believe is one of the driving factors behind the use of port 993.)

> That's the bit I'm questioning. I figure that if we could do
> just the secure one, then we'd be done and that'd be a better
> approach than having two. I also think that if we muck up and
> do a pretend job on security then we end up with 3: plain,
> pretend-secure and eventually-fixed-secure. That's happened
> with more than IMAP.

It's not what happened with IMAP. We specified one mechanism with real
security, but included enough weasel words that engaging that security was not
required. But the mechanism we specified failed to meet deployability
requirements in the real world, and as a result a plurality if not an actual
majority of what actually deployed was a secure mechanism we did not specify.

> I don't know if only doing the secure one in an IETF context
> is at all likely though. History would seem to show that its
> not. OTOH, it is true that doing the secure versions is much
> better understood now and much more practical than it was a
> decade ago, so I think its worth exploring.

And the reason it is not is that there are compelling reasons to provide
the variant without security.

> > See above. Again ignoring the fact that IMAP wouldn't be done in remotely
> > the same way if we were doing it today, the anwer is no, we'd almost
> > certainly still want to have an insecure variant.

> Why? Serious question.

Because of things like usage inside of data centers, where all the connections
are either protected physically or by encryption at a different layer. Indeed,
there are use cases where security auditing mandates that SSL/TLS *not* be
used.

Now, of course you can argue that this is some sort of private use case that
doesn't warrant coverage in the relevant standards. But I'm here to tell you
that this sort of handwaving is increasingly being seen for what it really is:
A refusal to come to grips with how applications are implemented and deployed
at very large scale. And it doesn't help when we also botch the secure variant
we do specify.

> >> Yes - I think that supports my argument - the existence of a
> >> "pretend" security variant at day zero is damaging so we should
> >> ask whether we ought just make the security mandatory to use
> >> and end up with one version.
> >
> > On the contrary, what's damaging on day zero is having a specification for
> > which compliance isn't practical for a significant fraction of implementors,
> > deployers, or both. This is what happened in the case of IMAP, and the result
> > was vendors ignored what the specifications called for and secured the protocol
> > in their own way. (And security isn't the only example of this in IMAP.)

> I agree that that happened and was damaging. I don't thinks its
> at all contrary to what I said.

I don't know what "contrary" means in this context. That said, it is my
position, based on decades of dealing with the major players in this space,
is that what you are proposing will at best be ignored and at worst be even
more damaging.

> >
> >>> And since only yesterday I was listening to a presentation that among other
> >>> things covered the specifics of how a provider with 10s of millions of users
> >>> handles this particular problem, I can state with some authority that the costs
> >>> aren't that big a deal.
> >
> >> I don't get what you mean there.
> >
> > You claimed that there are valid arguments that the TLS ciphersuites that are
> > MTI are too hard to deploy. AFAICT that claim is false.

> I do think that the PKI parts are too hard to deploy. Not for
> the larger MSPs, but it could be a good bit easier. Or maybe
> you're the one person in the universe who thinks that deploying
> PKI is a doddle:-)

The way the PKI part of this plays is that there's an initial pain point
getting it going and, for a large data center, automating certification
generation and distribution. But this is a one time cost, and not a substantial
one.

More generally, you don't seem to grasp the way a setup with 10s of millions of
accounts with services scattered across hundreds, thousands, or even tens of
thousands of hosts has to operate. In such a world the automation of 
certificate generation and distribution is an insignificant detail buried
inside of a vast amount of other automatic configuration processig.

				Ned

From stephen.farrell@cs.tcd.ie  Fri Oct 18 14:22:19 2013
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Date: Fri, 18 Oct 2013 22:22:02 +0100
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hi,

On 10/17/2013 11:11 PM, ned+perpass@mrochek.com wrote:
> ...I'm starting to wonder whether or not
> we're reading the same article. There's only one reference to acquisition
> of mail message content in the one I'm reading, which says:
> 
>   Each day, the presentation said, the NSA collects contacts from an estimated
>   500,000 buddy lists on live-chat services as well as from the inbox displays
>   of Web-based e-mail accounts.
> 
> I'm not going to bother quoting the correponding material on the actual slides
> because I'd have to retype it, but it absolutely backs up this paragraph.

The slides eventually linked to are at [1], slide 4 bullet 2
is the main one I think but you're right that the first bullet
says webmail. My assumption is that they use every possible
way they can, whether that's webmail or IMAP or IM or whatever
goes by in clear or more probably some combination.

[1]
http://s3.documentcloud.org/documents/804763/a-sso-content-optimization-detailed-redacted.pdf

> 
> Clearly the inbox information is coming from web mail. And the way modern web
> mail works is a big wad of Javascript gets  downloaded to the browser, which
> then communicates with the back end server by exchanging JSON, XML, HTML,
> whatever with a back end server. The client state, to the extent there is any,
> is jointly maintained by the front and back ends.

Thanks for web-mail-101 lesson;-)

> The web mail server (which may consist of multiple server layers, proxies,
> caches, separate authentication servers, and who knows what else) then talks to
> the actual message store. In many cases this is done in a proprietary fashion.
> And if IMAP is used, those IMAP connections are happening within the data
> center, not on the open Internet. Even if the connections travel from
> one data center to another (the use-case for that would be shared folder
> access, which by definition is not going to be your inbox), that's going
> to be done on a private network, if for no other reason than to avoid timeout
> issues.

Sure. But with 4.7M listeners on port 143 (see my earlier mail) it
would be credible too to get a bunch of those via installations
that don't have a working starttls setup.

Mind you the above speculations aren't really decideable so its
probably not worth our time to quibble further on it.

> 
> And as I noted before, ActiveSync may play a role here, although I'm not
> familiar enough with the use cases for it to be sure.
> 
>>> Additionally, there's the peculiar use of the term "inbox" rather than to email
>>> messages in general. IMAP provides access to all folders, whereas protocols
>>> like ActiveSync are used specifically to notify users of the presence of new
>>> messages in their inbox.
>>>
>>> And as I noted previously, the peculiarly isolated IMAP slide at the  end is
>>> not evidence of anything because we lack context. For all we know it was
>>> included as an example of a case where collection is particularly difficult.
> 
>> I agree it stands out from the others and is hard to interpret.
>> I don't think inbox is hard to intepret at all though.
> 
> It isn't. But you appear to have not considered the context in which it was
> used.
> 
>>> The state of play for those servers is actually pretty easy to quantify, and
>>> I'll do that in a followup message.
>>>
>>>>>> When the numbers involved ("500,000 buddylists and
>>>>>> inboxes" collected on a "representative day" for just
>>>>>> one agency) are at that scale, then it seems to me that
>>>>>> one can fairly describe that as a failure in protocol
>>>>>> design and not solely as a bad deployment choice.
>>>>>
>>>>> And again I have to ask: What is the "protocol design failure" of which you
>>>>> speak?
>>>
>>>> Basically, having three flavours of IMAP (clear, STARTTLS and 993)
>>>> where one that just mandated use of TLS could arguably be simpler
>>>> and more secure.
>>>
>>> More on this later.
>>>
>>>> And note - I'm not saying this should've been
>>>> done years ago, I'm asking if in a similar situation today we
>>>> ought go for the one-with-security or the 3-flavoured approach.
>>>
>>> First of all, IMAP is a less than ideal example because if we were doing it
>>> today it would almost certainly be cast as a web service, and in that case it
>>> would simply be another thing in the https/http space.
>>>
>>> But if you ignore that little detail, I don't think you're going to like my
>>> conclusions of the lessons learned from IMAP in particular and email in
>>> general.
> 
>> I don't dislike 'em actually. Most seem reasonable.
> 
>>> My conclusionare that that most of the time the right things to do
>>> are:
>>>
>>> (1) Define the service on two ports, one with SSL/TLS covering the entire
>>>     session and the other with no SSL/TLS option at all. (This makes the secure
>>>     variant easy to deploying on connection-terminating load balancers,
>>>     which I believe is one of the driving factors behind the use of port 993.)
> 
>> That's the bit I'm questioning. I figure that if we could do
>> just the secure one, then we'd be done and that'd be a better
>> approach than having two. I also think that if we muck up and
>> do a pretend job on security then we end up with 3: plain,
>> pretend-secure and eventually-fixed-secure. That's happened
>> with more than IMAP.
> 
> It's not what happened with IMAP. 

I didn't say the above was a blow-by-blow description of
how we ended up with IMAP. But we did end up with 3 flavours
as described.

> We specified one mechanism with real
> security, but included enough weasel words that engaging that security was not
> required. But the mechanism we specified failed to meet deployability
> requirements in the real world, and as a result a plurality if not an actual
> majority of what actually deployed was a secure mechanism we did not specify.

That's consistent with what I said above.

>> I don't know if only doing the secure one in an IETF context
>> is at all likely though. History would seem to show that its
>> not. OTOH, it is true that doing the secure versions is much
>> better understood now and much more practical than it was a
>> decade ago, so I think its worth exploring.
> 
> And the reason it is not is that there are compelling reasons to provide
> the variant without security.
> 
>>> See above. Again ignoring the fact that IMAP wouldn't be done in remotely
>>> the same way if we were doing it today, the anwer is no, we'd almost
>>> certainly still want to have an insecure variant.
> 
>> Why? Serious question.
> 
> Because of things like usage inside of data centers, where all the connections
> are either protected physically or by encryption at a different layer. Indeed,
> there are use cases where security auditing mandates that SSL/TLS *not* be
> used.

That's not inconsistent with the default being to include and
turn on security from day 1. Things can also be turned off for
scenarios such as the above, so I still don't see a need to
have specs that only cover the insecure/plain version of things
like IMAP.

My point is that if we took that approach then we'd be far
less likely to screw up the security bits, for performance,
deployment or "too much" security reasons or whatever reason
your undoubted experience tells you is most common.

> Now, of course you can argue that this is some sort of private use case that
> doesn't warrant coverage in the relevant standards. But I'm here to tell you
> that this sort of handwaving is increasingly being seen for what it really is:

You put words in my mouth and then accuse me of handwaving?
That makes it hard to have a discussion on what is I think
an important topic. (How to screw up less with how we define
security for our protocols.) It'd be better maybe to tone
that kind of thing down a bit.

> A refusal to come to grips with how applications are implemented and deployed
> at very large scale. And it doesn't help when we also botch the secure variant
> we do specify.
> 
>>>> Yes - I think that supports my argument - the existence of a
>>>> "pretend" security variant at day zero is damaging so we should
>>>> ask whether we ought just make the security mandatory to use
>>>> and end up with one version.
>>>
>>> On the contrary, what's damaging on day zero is having a specification for
>>> which compliance isn't practical for a significant fraction of implementors,
>>> deployers, or both. This is what happened in the case of IMAP, and the result
>>> was vendors ignored what the specifications called for and secured the protocol
>>> in their own way. (And security isn't the only example of this in IMAP.)
> 
>> I agree that that happened and was damaging. I don't thinks its
>> at all contrary to what I said.
> 
> I don't know what "contrary" means in this context. 

You said "on the contrary" - I don't think we're disagreeing
much.

> That said, it is my
> position, based on decades of dealing with the major players in this space,
> is that what you are proposing will at best be ignored and at worst be even
> more damaging.

I'm getting the impression you think I'm proposing something
I'm not, but its quite hard to tell really.

S.

> 
>>>
>>>>> And since only yesterday I was listening to a presentation that among other
>>>>> things covered the specifics of how a provider with 10s of millions of users
>>>>> handles this particular problem, I can state with some authority that the costs
>>>>> aren't that big a deal.
>>>
>>>> I don't get what you mean there.
>>>
>>> You claimed that there are valid arguments that the TLS ciphersuites that are
>>> MTI are too hard to deploy. AFAICT that claim is false.
> 
>> I do think that the PKI parts are too hard to deploy. Not for
>> the larger MSPs, but it could be a good bit easier. Or maybe
>> you're the one person in the universe who thinks that deploying
>> PKI is a doddle:-)
> 
> The way the PKI part of this plays is that there's an initial pain point
> getting it going and, for a large data center, automating certification
> generation and distribution. But this is a one time cost, and not a substantial
> one.
> 
> More generally, you don't seem to grasp the way a setup with 10s of millions of
> accounts with services scattered across hundreds, thousands, or even tens of
> thousands of hosts has to operate. In such a world the automation of 
> certificate generation and distribution is an insignificant detail buried
> inside of a vast amount of other automatic configuration processig.
> 
> 				Ned
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

From hallam@gmail.com  Sat Oct 19 08:24:39 2013
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Subject: [perpass] NSA inspired PKIX limitations?
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--089e01227ca415f1ab04e919a670
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There are a bunch of changes to PKIX that were blocked for quite some time.
The opposition coming from a cabal of DoD etc. contractors. This opposition
has proven ultimately futile since the industry has decided to ignore the
specification and set its own standards in two cases.

I don't want to get into a discussion of Snowden etc. I will however note
that I suspected something of the sort was going on several years ago and
that is why I was looking to take the standards process to a forum where
such interference could be prevented. The only practical effect of Snowden
is that I can now explain the reasons for that decision without sounding
like a black helicopter paranoid nut.


1) Name Constraints MUST be marked critical

And utterly stupid restriction since the semantics of the criticality bit
are 'break backwards compatibility'. Use of name constraints provide a
significant reduction in the attack surface and would have prevented the
Flame attack. However marking a name constraint critical breaks Safari and
provides no security benefit in the Web PKI.

Outcome: Industry has decided that the standard is that name constraints
MAY be marked non-critical.


2) OCSP reports success for unknown/unissued certificates.

One of the reasons that the DigiNotar incident was so severe is that the
OCSP responder reported 'Valid' status for certificates that the CA had not
issued. This limit is allegedly a consequence of the DoD's billion dollar
PKI being unable to issue OCSP responses except by using CRLs as a source.

One important consequence of this constraint is that it provides a weak
form of CA transparency. It is possible to determine whether a CA is
consistently defaulting on this requirement or not.


Outcome: Industry has mandated OCSP responses report INVALID status if the
certificate was not issued.



-- 
Website: http://hallambaker.com/

--089e01227ca415f1ab04e919a670
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<div dir=3D"ltr">There are a bunch of changes to PKIX that were blocked for=
 quite some time. The opposition coming from a cabal of DoD etc. contractor=
s. This opposition has proven ultimately futile since the industry has deci=
ded to ignore the specification and set its own standards in two cases.<div=
>
<br><div>I don&#39;t want to get into a discussion of Snowden etc. I will h=
owever note that I suspected something of the sort was going on several yea=
rs ago and that is why I was looking to take the standards process to a for=
um where such interference could be prevented. The only practical effect of=
 Snowden is that I can now explain the reasons for that decision without so=
unding like a black helicopter paranoid nut.</div>
<div><br></div><div><br></div><div>1) Name Constraints MUST be marked criti=
cal</div><div><br></div><div>And utterly stupid restriction since the seman=
tics of the criticality bit are &#39;break backwards compatibility&#39;. Us=
e of name constraints provide a significant reduction in the attack surface=
 and would have prevented the Flame attack. However marking a name constrai=
nt critical breaks Safari and provides no security benefit in the Web PKI.=
=A0</div>
<div><br></div><div>Outcome: Industry has decided that the standard is that=
 name constraints MAY be marked non-critical.</div><div><br clear=3D"all"><=
div><br></div><div>2) OCSP reports success for unknown/unissued certificate=
s.</div>
<div><br></div><div>One of the reasons that the DigiNotar incident was so s=
evere is that the OCSP responder reported &#39;Valid&#39; status for certif=
icates that the CA had not issued. This limit is allegedly a consequence of=
 the DoD&#39;s billion dollar PKI being unable to issue OCSP responses exce=
pt by using CRLs as a source.</div>
<div><br></div><div>One important consequence of this constraint is that it=
 provides a weak form of CA transparency. It is possible to determine wheth=
er a CA is consistently defaulting on this requirement or not.</div><div>
<br></div><div><br></div><div>Outcome: Industry has mandated OCSP responses=
 report INVALID status if the certificate was not issued.</div><div><br></d=
iv><div><br></div><div><br></div>-- <br>Website: <a href=3D"http://hallamba=
ker.com/">http://hallambaker.com/</a><br>

</div></div></div>

--089e01227ca415f1ab04e919a670--

From stephen.farrell@cs.tcd.ie  Sat Oct 19 08:46:40 2013
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Date: Sat, 19 Oct 2013 16:46:31 +0100
From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [perpass] NSA inspired PKIX limitations?
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Hiya,

FWIW, I don't buy Phill's theory at all.

I do think its fair to say that the US DoD set of requirements
for PKI have dominated discussion at various times. Now that
is a complex PKI and not much like the web PKI so that has
generated some friction, but I don't see any need at all for
conspiracy theories to explain that. It just seems to me like
a normal case of different reasonably large sets of folks
having very similar but slightly different requirements.

On the specific topics below, if I recall correctly, both
were uncontroversial parts of the "design" of PKI for years
before they became problematic for the web PKI when it
finally started to seriously consider revocation. And it
seems to me that both "sides" in that debate were inflexible
and unwilling to make changes. I still don't know why that
was, and it still seems dumb to me, but life's full of little
mysteries like that.

And I am just not seeing how this is related to pervasive
monitoring except very very tangentially - Phill, can you
please explain its relevance?

And finally the subject line also seems unwise as it'll probably
just annoy folks and just distract us from getting real work
done. (So, if it does annoy you, please try be moderate in
your response, or maybe don't even send that mail, until we
see how Phill justifies its relevance.)

Cheers,
S.

On 10/19/2013 04:24 PM, Phillip Hallam-Baker wrote:
> There are a bunch of changes to PKIX that were blocked for quite some time.
> The opposition coming from a cabal of DoD etc. contractors. This opposition
> has proven ultimately futile since the industry has decided to ignore the
> specification and set its own standards in two cases.
> 
> I don't want to get into a discussion of Snowden etc. I will however note
> that I suspected something of the sort was going on several years ago and
> that is why I was looking to take the standards process to a forum where
> such interference could be prevented. The only practical effect of Snowden
> is that I can now explain the reasons for that decision without sounding
> like a black helicopter paranoid nut.
> 
> 
> 1) Name Constraints MUST be marked critical
> 
> And utterly stupid restriction since the semantics of the criticality bit
> are 'break backwards compatibility'. Use of name constraints provide a
> significant reduction in the attack surface and would have prevented the
> Flame attack. However marking a name constraint critical breaks Safari and
> provides no security benefit in the Web PKI.
> 
> Outcome: Industry has decided that the standard is that name constraints
> MAY be marked non-critical.
> 
> 
> 2) OCSP reports success for unknown/unissued certificates.
> 
> One of the reasons that the DigiNotar incident was so severe is that the
> OCSP responder reported 'Valid' status for certificates that the CA had not
> issued. This limit is allegedly a consequence of the DoD's billion dollar
> PKI being unable to issue OCSP responses except by using CRLs as a source.
> 
> One important consequence of this constraint is that it provides a weak
> form of CA transparency. It is possible to determine whether a CA is
> consistently defaulting on this requirement or not.
> 
> 
> Outcome: Industry has mandated OCSP responses report INVALID status if the
> certificate was not issued.
> 
> 
> 
> 
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

From hallam@gmail.com  Sat Oct 19 10:48:58 2013
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Date: Sat, 19 Oct 2013 13:48:55 -0400
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From: Phillip Hallam-Baker <hallam@gmail.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] NSA inspired PKIX limitations?
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--089e0160bf7029f71604e91baab4
Content-Type: text/plain; charset=ISO-8859-1

On Sat, Oct 19, 2013 at 11:46 AM, Stephen Farrell <stephen.farrell@cs.tcd.ie
> wrote:

>
> Hiya,
>
> FWIW, I don't buy Phill's theory at all.
>

We have a document that states there is a $250 million budget set for a
program that includes infiltrating the standards process as a stated part
of the program.

Now we can dispute the authenticity of the document but I see it as
confirming my earlier strong suspicion.



> On the specific topics below, if I recall correctly, both
> were uncontroversial parts of the "design" of PKI for years
> before they became problematic for the web PKI when it
> finally started to seriously consider revocation.


They were uncontroversial until the DigiNotar and Flame incidents and until
the EFF certificate observatory started a FUD attack making spurious claims
. Until that point I was mainly concerned with the risk that one of my CAs
might be breached. I did not see the need for Name constraints because I
had other controls that I consider to be sufficient.

The OCSP feature was very controversial at the time the limitation was
originally introduced. The reason I did not press the issue then was that I
did not see it as critical and insisting on a strong status result could
arguably be seen as interfering with the Valicert business model at the
time.


> And it
> seems to me that both "sides" in that debate were inflexible
> and unwilling to make changes. I still don't know why that
> was, and it still seems dumb to me, but life's full of little
> mysteries like that.
>

My position is based on the actions taken by the deployed base. I can't
change that and so I don't have much ability to change my position.

I can't see why the inability of the DoD to support an accurate status
result should require the rest of us to adopt their lowest common
denominator security.



> And I am just not seeing how this is related to pervasive
> monitoring except very very tangentially - Phill, can you
> please explain its relevance?
>

I believe that the vulnerability exploited in Flame would have been closed
had the standards changes resisted by the DoD been adopted in a timely
fashion and that the DigiNotar incident might have been detected earlier.

The documentary evidence shows that interfering with the standards process
to prevent deployment of countermeasures is part of the cost of running
PRISM etc. That is a cost that I am not prepared to pay because these
generals who I have to sit in rooms with and listen to their plans for
cyber-attack are making use less safe by compromising our ability to
achieve strong cyber-defense.

The question of how we can build open standards to defend against covert
pervasive monitoring in the face of attempts to disrupt these efforts is a
very difficult one.



> And finally the subject line also seems unwise as it'll probably
> just annoy folks and just distract us from getting real work
> done. (So, if it does annoy you, please try be moderate in
> your response, or maybe don't even send that mail, until we
> see how Phill justifies its relevance.)
>

Well we could spend the next few years dancing round the subject and
pretending that the elephants are not in the room but I have no intention
of doing so.

Now that my question on Alexander has been answered, I am looking for an
answer to the question I raised at the RSA conference this year: How can we
have a government-industry partnership to improve cyber security when a
part of the military is actively engaged in subverting the standards
process to protect vulnerabilities they might use in attacks? This is not
the only forum I am raising this question, I am raising it with the policy
makers in government as well.

I am quite used to being accused of peddling an agenda. For some reasons
CAs are always accused of having some covert agenda and raising this on the
lists is never seen as objectionable because it is so frequent. But the
response I give is not 'how dare you ask that question' but instead 'why
don't you hold all the other parties you rely on to the same degree of
scrutiny'.


-- 
Website: http://hallambaker.com/

--089e0160bf7029f71604e91baab4
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">On Sat, Oct 19, 2013 at 11:46 AM, Stephen Farrell <span di=
r=3D"ltr">&lt;<a href=3D"mailto:stephen.farrell@cs.tcd.ie" target=3D"_blank=
">stephen.farrell@cs.tcd.ie</a>&gt;</span> wrote:<br><div class=3D"gmail_ex=
tra"><div class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><br>
Hiya,<br>
<br>
FWIW, I don&#39;t buy Phill&#39;s theory at all.<br></blockquote><div><br><=
/div><div>We have a document that states there is a $250 million budget set=
 for a program that includes infiltrating the standards process as a stated=
 part of the program.=A0</div>
<div><br></div><div>Now we can dispute the authenticity of the document but=
 I see it as confirming my earlier strong suspicion.</div><div><br></div><d=
iv>=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex">

On the specific topics below, if I recall correctly, both<br>
were uncontroversial parts of the &quot;design&quot; of PKI for years<br>
before they became problematic for the web PKI when it<br>
finally started to seriously consider revocation. </blockquote><div><br></d=
iv><div>They were uncontroversial until the DigiNotar and Flame incidents a=
nd until the EFF certificate observatory started a FUD attack making spurio=
us claims . Until that point I was mainly concerned with the risk that one =
of my CAs might be breached. I did not see the need for Name constraints be=
cause I had other controls that I consider to be sufficient.=A0</div>
<div><br></div><div>The OCSP feature was very controversial at the time the=
 limitation was originally introduced. The reason I did not press the issue=
 then was that I did not see it as critical and insisting on a strong statu=
s result could arguably be seen as interfering with the Valicert business m=
odel at the time.=A0</div>
<div>=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex">And it<br>
seems to me that both &quot;sides&quot; in that debate were inflexible<br>
and unwilling to make changes. I still don&#39;t know why that<br>
was, and it still seems dumb to me, but life&#39;s full of little<br>
mysteries like that.<br></blockquote><div><br></div><div>My position is bas=
ed on the actions taken by the deployed base. I can&#39;t change that and s=
o I don&#39;t have much ability to change my position.</div><div><br></div>
<div>I can&#39;t see why the inability of the DoD to support an accurate st=
atus result should require the rest of us to adopt their lowest common deno=
minator security.=A0</div><div><br></div><div>=A0</div><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding=
-left:1ex">

And I am just not seeing how this is related to pervasive<br>
monitoring except very very tangentially - Phill, can you<br>
please explain its relevance?<br></blockquote><div><br></div><div>I believe=
 that the vulnerability exploited in Flame would have been closed had the s=
tandards changes resisted by the DoD been adopted in a timely fashion and t=
hat the DigiNotar incident might have been detected earlier.</div>
<div><br></div><div>The documentary evidence shows that interfering with th=
e standards process to prevent deployment of countermeasures is part of the=
 cost of running PRISM etc. That is a cost that I am not prepared to pay be=
cause these generals who I have to sit in rooms with and listen to their pl=
ans for cyber-attack are making use less safe by compromising our ability t=
o achieve strong cyber-defense.</div>
<div><br></div><div>The question of how we can build open standards to defe=
nd against covert pervasive monitoring in the face of attempts to disrupt t=
hese efforts is a very difficult one.=A0</div><div><br></div><div>=A0<br></=
div>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
And finally the subject line also seems unwise as it&#39;ll probably<br>
just annoy folks and just distract us from getting real work<br>
done. (So, if it does annoy you, please try be moderate in<br>
your response, or maybe don&#39;t even send that mail, until we<br>
see how Phill justifies its relevance.)<br></blockquote><div><br></div><div=
>Well we could spend the next few years dancing round the subject and prete=
nding that the elephants are not in the room but I have no intention of doi=
ng so.=A0</div>
<div><br></div><div>Now that my question on Alexander has been answered, I =
am looking for an answer to the question I raised at the RSA conference thi=
s year: How can we have a government-industry partnership to improve cyber =
security when a part of the military is actively engaged in subverting the =
standards process to protect vulnerabilities they might use in attacks? Thi=
s is not the only forum I am raising this question, I am raising it with th=
e policy makers in government as well.</div>
<div><br></div><div>I am quite used to being accused of peddling an agenda.=
 For some reasons CAs are always accused of having some covert agenda and r=
aising this on the lists is never seen as objectionable because it is so fr=
equent. But the response I give is not &#39;how dare you ask that question&=
#39; but instead &#39;why don&#39;t you hold all the other parties you rely=
 on to the same degree of scrutiny&#39;.<br>
</div></div><br clear=3D"all"><div><br></div>-- <br>Website: <a href=3D"htt=
p://hallambaker.com/">http://hallambaker.com/</a><br>
</div></div>

--089e0160bf7029f71604e91baab4--

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In-reply-to: "Your message dated Thu, 17 Oct 2013 17:45:04 -0700" <DE130FF7-92C3-41FA-87B0-D7E48288F5A0@gmail.com>
References: <525475AA.2010907@cs.tcd.ie> <525590CC.4030505@bbn.com> <5255EC1D.5040006@cs.tcd.ie> <5256F6CD.4090508@bbn.com> <5256FB71.8040903@cs.tcd.ie> <525722C4.4020408@bbn.com> <5C28CCD5-4B7D-4BFB-94F4-1C33E43BDCD7@cdt.org> <525BE7DC.4080407@gmail.com> <95859161-25E3-45BC-A5C2-B3C548FB2417@acm.org> <525C031B.5030100@bbn.com> <525C2099.6010307@cs.tcd.ie> <525C2C44.2070404@bbn.com> <525C8130.2000606@cs.tcd.ie> <525D183E.7000200@cs.tcd.ie> <01OZM7M57NWK00004R@mauve.mrochek.com> <525DDE3D.6020500@cs.tcd.ie> <01OZOV9PPNIU00004R@mauve.mrochek.com> <DE130FF7-92C3-41FA-87B0-D7E48288F5A0@gmail.com>
To: Douglas Otis <doug.mtview@gmail.com>
Cc: ned+perpass@mrochek.com, perpass <perpass@ietf.org>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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> On Oct 17, 2013, at 7:51 AM, ned+perpass@mrochek.com wrote:
> > Stephen Farrell <stephen.farrell@cs.tcd.ie> on Oct 15, 2013 5:31PM wrote:
> >> Better understanding is always good and the main goal here (at least
> >> mine) is to make pervasive monitoring more expensive to the extent
> >> technically feasible. Personally, I think there are things about IMAP
> >> that could be impoved but I'm very skeptical that we can "solve" the
> >> problem for mail in general. (Some others on this list are more
> >> optimistic.)
> >
> > You're still not answering the question, at least directly, and I really want a
> > direct answer. More expensive for whom? The vast majority of current and likely
> > future email users, who seem perfectly happy to use the service offerings of
> > large ISPs and MSPs? If so, then any proposal you come up with needs to done in
> > a way that persuades those providers that making changes to their service
> > offerings is the right thing for them to do.

> Dear Ned,

> Improving the efficiency of email acceptance might be this incentive.  As
> IPv6 becomes pervasive, an authenticated domain source as a basis is likely to
> be more sustainable over time.  Establishing expectations that StartTLS
> confirms both server and client certificates affords improved transactional
> protection from spoofing or reputation poisoning, especially with the
> transparency and economy afforded by DANE for protection from simple
> monitoring, malicious spoofing, and reputation poisoning.  Providers will need
> to be trustworthy and may need to reside in specific geopolitical regions
> willing to ensure such protections.

I must be missing something here, because I don't see how what we've been
discussing - preventing pervasive surveilance in general and mandating
SSL/TLS on more connections in particular - has anything to do with email
acceptance.

> Multiple keying of encrypted data where each key subset resides in different
> geopolitical regions might be a way to increase trust, but this is not
> off-the-shelf crypto which you state as a requirement.

The security of IMAP and similar mailbox manipulation protocols seems 
entirely divorced from what you're talking about.

				Ned

From ted.ietf@gmail.com  Sat Oct 19 18:21:32 2013
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From: Ted Hardie <ted.ietf@gmail.com>
To: perpass@ietf.org
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Subject: [perpass] Some personal thoughts on the impact of pervasive monitoring
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Like most folks involved in this list, I have a personal response to the
current situation and some thoughts on how it will impact my or our work in
the future.  Since I expect we will pretty short of mic time in Vancouver
for thoughts like these, I decided to write them out.

http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00

is the result.  It's quite short but a quick summary is this:

Pervasive monitoring induces self-censoring which harms the Internet and
its users.  At the scale of the modern Internet, that means it harms
humanity.

We can and should change our approach to Internet engineering and system
design to deal with this.  There will be costs for that, but we should pay
them.

It helps me, personally, to focus on a single user when asking whether a
system or protocol is appropriate in the current environment.  The draft
lays out why.

regards,

Ted Hardie

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<div dir=3D"ltr"><div><div>Like most folks involved in this list, I have a =
personal response to the current situation and some thoughts on how it will=
 impact my or our work in the future.=A0 Since I expect we will pretty shor=
t of mic time in Vancouver for thoughts like these, I decided to write them=
 out.<br>
<br><a href=3D"http://tools.ietf.org/html/draft-hardie-perpass-touchstone-0=
0">http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00</a><br><br=
></div>is the result.=A0 It&#39;s quite short but a quick summary is this:<=
br>
<br>Pervasive monitoring induces self-censoring which harms the Internet an=
d=20
its users.=A0 At the scale of the modern Internet, that means it harms=20
humanity.<br><br>We can and should change our approach to Internet engineer=
ing and system design to deal with this.=A0 There will be costs for that, b=
ut we should pay them.<br><br>It
 helps me, personally, to focus on a single user when asking whether a=20
system or protocol is appropriate in the current environment.=A0 The draft
 lays out why.<br><br></div>regards,<br><br>Ted Hardie<br></div>

--047d7bd7679acb068004e921fc9a--

From hallam@gmail.com  Sat Oct 19 18:42:15 2013
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From: Phillip Hallam-Baker <hallam@gmail.com>
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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[offlist]

On Sat, Oct 19, 2013 at 9:21 PM, Ted Hardie <ted.ietf@gmail.com> wrote:

> Like most folks involved in this list, I have a personal response to the
> current situation and some thoughts on how it will impact my or our work in
> the future.  Since I expect we will pretty short of mic time in Vancouver
> for thoughts like these, I decided to write them out.
>
> http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00
>
> is the result.  It's quite short but a quick summary is this:
>
> Pervasive monitoring induces self-censoring which harms the Internet and
> its users.  At the scale of the modern Internet, that means it harms
> humanity.
>

People behave differently when they know they are being watched.

I am not responding to PRISM, I am responding to the arrest of Miranda
using anti-terrorism powers. Trying to scare me makes me conclude that we
need to drastically reduce their capabilities.


-- 
Website: http://hallambaker.com/

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<div dir=3D"ltr"><div>[offlist]</div><div><br></div>On Sat, Oct 19, 2013 at=
 9:21 PM, Ted Hardie <span dir=3D"ltr">&lt;<a href=3D"mailto:ted.ietf@gmail=
.com" target=3D"_blank">ted.ietf@gmail.com</a>&gt;</span> wrote:<br><div cl=
ass=3D"gmail_extra">
<div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">=
<div><div>Like most folks involved in this list, I have a personal response=
 to the current situation and some thoughts on how it will impact my or our=
 work in the future.=A0 Since I expect we will pretty short of mic time in =
Vancouver for thoughts like these, I decided to write them out.<br>

<br><a href=3D"http://tools.ietf.org/html/draft-hardie-perpass-touchstone-0=
0" target=3D"_blank">http://tools.ietf.org/html/draft-hardie-perpass-touchs=
tone-00</a><br><br></div>is the result.=A0 It&#39;s quite short but a quick=
 summary is this:<br>

<br>Pervasive monitoring induces self-censoring which harms the Internet an=
d=20
its users.=A0 At the scale of the modern Internet, that means it harms=20
humanity.<br></div></div></blockquote><div><br></div><div>People behave dif=
ferently when they know they are being watched.</div><div><br></div><div>I =
am not responding to PRISM, I am responding to the arrest of Miranda using =
anti-terrorism powers. Trying to scare me makes me conclude that we need to=
 drastically reduce their capabilities.</div>
<div>=A0</div></div><div><br></div>-- <br>Website: <a href=3D"http://hallam=
baker.com/">http://hallambaker.com/</a><br>
</div></div>

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From: Eitan Adler <lists@eitanadler.com>
Date: Sat, 19 Oct 2013 22:04:06 -0400
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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On Sat, Oct 19, 2013 at 9:21 PM, Ted Hardie <ted.ietf@gmail.com> wrote:
> Like most folks involved in this list, I have a personal response to the
> current situation and some thoughts on how it will impact my or our work =
in
> the future.  Since I expect we will pretty short of mic time in Vancouver
> for thoughts like these, I decided to write them out.
>
> http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00
>
> is the result.  It's quite short but a quick summary is this:
>
> Pervasive monitoring induces self-censoring which harms the Internet and =
its
> users.  At the scale of the modern Internet, that means it harms humanity=
.
>
> We can and should change our approach to Internet engineering and system
> design to deal with this.  There will be costs for that, but we should pa=
y
> them.
>
> It helps me, personally, to focus on a single user when asking whether a
> system or protocol is appropriate in the current environment.  The draft
> lays out why.

You may want to directly address the arguments made in the paper
"Tussle in Cyberspace: Defining Tomorrow=E2=80=99s Internet" by Clark et al=
.

--=20
Eitan Adler

From tbray@textuality.com  Sat Oct 19 20:19:49 2013
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Excellent piece!


On Sat, Oct 19, 2013 at 6:21 PM, Ted Hardie <ted.ietf@gmail.com> wrote:

> Like most folks involved in this list, I have a personal response to the
> current situation and some thoughts on how it will impact my or our work in
> the future.  Since I expect we will pretty short of mic time in Vancouver
> for thoughts like these, I decided to write them out.
>
> http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00
>
> is the result.  It's quite short but a quick summary is this:
>
> Pervasive monitoring induces self-censoring which harms the Internet and
> its users.  At the scale of the modern Internet, that means it harms
> humanity.
>
> We can and should change our approach to Internet engineering and system
> design to deal with this.  There will be costs for that, but we should pay
> them.
>
> It helps me, personally, to focus on a single user when asking whether a
> system or protocol is appropriate in the current environment.  The draft
> lays out why.
>
> regards,
>
> Ted Hardie
>
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>
>

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<div dir=3D"ltr">Excellent piece!<br></div><div class=3D"gmail_extra"><br><=
br><div class=3D"gmail_quote">On Sat, Oct 19, 2013 at 6:21 PM, Ted Hardie <=
span dir=3D"ltr">&lt;<a href=3D"mailto:ted.ietf@gmail.com" target=3D"_blank=
">ted.ietf@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div><div>Like most folks i=
nvolved in this list, I have a personal response to the current situation a=
nd some thoughts on how it will impact my or our work in the future.=C2=A0 =
Since I expect we will pretty short of mic time in Vancouver for thoughts l=
ike these, I decided to write them out.<br>

<br><a href=3D"http://tools.ietf.org/html/draft-hardie-perpass-touchstone-0=
0" target=3D"_blank">http://tools.ietf.org/html/draft-hardie-perpass-touchs=
tone-00</a><br><br></div>is the result.=C2=A0 It&#39;s quite short but a qu=
ick summary is this:<br>

<br>Pervasive monitoring induces self-censoring which harms the Internet an=
d=20
its users.=C2=A0 At the scale of the modern Internet, that means it harms=
=20
humanity.<br><br>We can and should change our approach to Internet engineer=
ing and system design to deal with this.=C2=A0 There will be costs for that=
, but we should pay them.<br><br>It
 helps me, personally, to focus on a single user when asking whether a=20
system or protocol is appropriate in the current environment.=C2=A0 The dra=
ft
 lays out why.<br><br></div>regards,<br><br>Ted Hardie<br></div>
<br>_______________________________________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/perpass</a><br>
<br></blockquote></div><br></div>

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To: Ted Hardie <ted.ietf@gmail.com>
Thread-Topic: [perpass] Some personal thoughts on the impact of pervasive monitoring
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On Oct 20, 2013, at 4:21 AM, Ted Hardie <ted.ietf@gmail.com<mailto:ted.ietf=
@gmail.com>> wrote:

Like most folks involved in this list, I have a personal response to the cu=
rrent situation and some thoughts on how it will impact my or our work in t=
he future.  Since I expect we will pretty short of mic time in Vancouver fo=
r thoughts like these, I decided to write them out.

http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00

is the result.  It's quite short but a quick summary is this:

Pervasive monitoring induces self-censoring which harms the Internet and it=
s users.  At the scale of the modern Internet, that means it harms humanity=
.

We can and should change our approach to Internet engineering and system de=
sign to deal with this.  There will be costs for that, but we should pay th=
em.

It helps me, personally, to focus on a single user when asking whether a sy=
stem or protocol is appropriate in the current environment.  The draft lays=
 out why.

regards,

Ted Hardie

Hi, Ted

In your draft, you propose we ask ourselves a question about any protocol w=
e design, and that question can be something like "Can a gay kid in Uganda =
use this safely?"

IMO nothing we do here can yield an unqualified "yes" answer to that questi=
on. Nothing here relates to public statements such as personal blogs or Int=
ernet Drafts. Those are obviously public and the authors are identified, an=
d the state apparatus can read them just fine, regardless of how secure we =
make them.

So there are two kinds of communications that we would seek to protect. pub=
lic statements made anonymously, and private statements made either person-=
to-person or within a small group. You can't avoid any kind of monitoring, =
pervasive or otherwise, without having both encryption and authentication. =
This is regardless of whether the encryption and authentication are with th=
e communications peer or with an anonymizer. Encryption and authentication =
with a middlebox (such as using a web-based mail service with TLS) is not s=
ufficient, as the privacy of the communications depends on both the trustwo=
rthiness of the intermediary and strength of the authentication that the in=
termediary performs. I think it would be naive to expect an intermediary pr=
oviding a web service to resist the government. So we're left with mandator=
y mutual authentication.

And that's the issue. We (meaning the people who work on Internet infrastru=
cture) have never been able to deploy an identity management system good en=
ough that everyone will use it.

I am not familiar enough with Ugandan politics to know to what extent the a=
nti-gay laws are enforced or investigated. Most European countries and US s=
tates had such laws for decades without the police ever expending any resou=
rces to catch the criminals. But from what I've read in Wikipedia, the huma=
n rights situation is pretty grim for gays. So although it's tempting to th=
ink that using a US-based service like GMail would be safe from the local g=
overnment, I don't think that's good enough to merit an unqualified "yes" a=
nswer to your question. The thing about pervasive monitoring, is that even =
if it was set up to catch terrorists, once the system is in place, it's ver=
y tempting to use the collected information to fight crime.

If the Ugandan government has decided to investigate a specific person, the=
y can big his phone, install spyware on his computer, and follow him around=
. They will find evidence. The best we can do is to make our protocols such=
 that pervasive surveillance is impossible. We can only hope, that if surve=
illance resistance is made such that the US government has the resources to=
 spy on 10,000 people while Uganda has the resources to spy on 9 people (ba=
sed on the ratio of national budget expenditures), that the Ugandan governm=
ent will not waste its precious 9 "slots" on tracking down homosexuals.

So while I don't think we can make any particular protocol safe for a suspe=
ct, we can make it so that the average person feels safe enough to risk pri=
vate communications as long as they believe they are "under the radar".  Id=
eally, the steps to reach that goal would be enough to obscure the few who =
do use strong person-to-person authentication.

But even with strong person-to-person authentication, a gay Ugandan would s=
till have to avoid discussing anything that is illegal in Uganda with peopl=
e he's not familiar enough with, for fear they are government agents. There=
 can be no online support group helping teenagers, and there can be no Inte=
rnet dating sites. Nothing we do can make that happen.

Yoav



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<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
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</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; ">
<br>
<div>
<div>On Oct 20, 2013, at 4:21 AM, Ted Hardie &lt;<a href=3D"mailto:ted.ietf=
@gmail.com">ted.ietf@gmail.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<blockquote type=3D"cite">
<div dir=3D"ltr">
<div>
<div>Like most folks involved in this list, I have a personal response to t=
he current situation and some thoughts on how it will impact my or our work=
 in the future.&nbsp; Since I expect we will pretty short of mic time in Va=
ncouver for thoughts like these, I decided
 to write them out.<br>
<br>
<a href=3D"http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00">h=
ttp://tools.ietf.org/html/draft-hardie-perpass-touchstone-00</a><br>
<br>
</div>
is the result.&nbsp; It's quite short but a quick summary is this:<br>
<br>
Pervasive monitoring induces self-censoring which harms the Internet and it=
s users.&nbsp; At the scale of the modern Internet, that means it harms hum=
anity.<br>
<br>
We can and should change our approach to Internet engineering and system de=
sign to deal with this.&nbsp; There will be costs for that, but we should p=
ay them.<br>
<br>
It helps me, personally, to focus on a single user when asking whether a sy=
stem or protocol is appropriate in the current environment.&nbsp; The draft=
 lays out why.<br>
<br>
</div>
regards,<br>
<br>
Ted Hardie<br>
</div>
</blockquote>
<br>
</div>
<div>Hi, Ted</div>
<div><br>
</div>
<div>In your draft, you propose we ask ourselves a question about any proto=
col we design, and that question can be something like &quot;Can a gay kid =
in Uganda use this safely?&quot;</div>
<div><br>
</div>
<div>IMO nothing we do here can yield an unqualified &quot;yes&quot; answer=
 to that question. Nothing here relates to public statements such as person=
al blogs or Internet Drafts. Those are obviously public and the authors are=
 identified, and the state apparatus can read
 them just fine, regardless of how secure we make them.</div>
<div><br>
</div>
<div>So there are two kinds of communications that we would seek to protect=
. public statements made anonymously, and private statements made either pe=
rson-to-person or within a small group. You can't avoid any kind of monitor=
ing, pervasive or otherwise, without
 having both encryption and authentication. This is regardless of whether t=
he encryption and authentication are with the communications peer or with a=
n anonymizer. Encryption and authentication with a middlebox (such as using=
 a web-based mail service with TLS)
 is not sufficient, as the privacy of the communications depends on both th=
e trustworthiness of the intermediary and strength of the authentication th=
at the intermediary performs. I think it would be naive to expect an interm=
ediary providing a web service to
 resist the government. So we're left with mandatory mutual authentication.=
</div>
<div><br>
</div>
<div>And that's the issue. We (meaning the people who work on Internet infr=
astructure) have never been able to deploy an identity management system go=
od enough that everyone will use it.</div>
<div><br>
</div>
<div>I am not familiar enough with Ugandan politics to know to what extent =
the anti-gay laws are enforced or investigated. Most European countries and=
 US states had such laws for decades without the police ever expending any =
resources to catch the criminals.
 But from what I've read in Wikipedia, the human rights situation is pretty=
 grim for gays. So although it's tempting to think that using a US-based se=
rvice like GMail would be safe from the local government, I don't think tha=
t's good enough to merit an unqualified
 &quot;yes&quot; answer to your question. The thing about pervasive monitor=
ing, is that even if it was set up to catch terrorists, once the system is =
in place, it's very tempting to use the collected information to fight crim=
e.</div>
<div><br>
</div>
<div>If the Ugandan government has decided to investigate a specific person=
, they can big his phone, install spyware on his computer, and follow him a=
round. They will find evidence. The best we can do is to make our protocols=
 such that pervasive surveillance
 is impossible. We can only hope, that if surveillance resistance is made s=
uch that the US government has the resources to spy on 10,000 people while =
Uganda has the resources to spy on 9 people (based on the ratio of national=
 budget expenditures), that the
 Ugandan government will not waste its precious 9 &quot;slots&quot; on trac=
king down homosexuals.</div>
<div><br>
</div>
<div>So while I don't think we can make any particular protocol safe for a =
suspect, we can make it so that the average person feels safe enough to ris=
k private communications as long as they believe they are &quot;under the r=
adar&quot;. &nbsp;Ideally, the steps to reach that
 goal would be enough to obscure the few who do use strong person-to-person=
 authentication.&nbsp;</div>
<div><br>
</div>
<div>But even with strong person-to-person authentication, a gay Ugandan wo=
uld still have to avoid discussing anything that is illegal in Uganda with =
people he's not familiar enough with, for fear they are government agents. =
There can be no online support group
 helping teenagers, and there can be no Internet dating sites. Nothing we d=
o can make that happen.&nbsp;</div>
<div><br>
</div>
<div>Yoav</div>
<div><br>
</div>
<br>
</body>
</html>

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From: Yoav Nir <ynir@checkpoint.com>
To: Ted Hardie <ted.ietf@gmail.com>
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On Oct 20, 2013, at 4:21 AM, Ted Hardie <ted.ietf@gmail.com<mailto:ted.ietf=
@gmail.com>> wrote:

Like most folks involved in this list, I have a personal response to the cu=
rrent situation and some thoughts on how it will impact my or our work in t=
he future.  Since I expect we will pretty short of mic time in Vancouver fo=
r thoughts like these, I decided to write them out.

http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00

is the result.  It's quite short but a quick summary is this:

Pervasive monitoring induces self-censoring which harms the Internet and it=
s users.  At the scale of the modern Internet, that means it harms humanity=
.

We can and should change our approach to Internet engineering and system de=
sign to deal with this.  There will be costs for that, but we should pay th=
em.

It helps me, personally, to focus on a single user when asking whether a sy=
stem or protocol is appropriate in the current environment.  The draft lays=
 out why.

regards,

Ted Hardie

Hi, Ted

In your draft, you propose we ask ourselves a question about any protocol w=
e design, and that question can be something like "Can a gay kid in Uganda =
use this safely?"

IMO nothing we do here can yield an unqualified "yes" answer to that questi=
on. Nothing here relates to public statements such as personal blogs or Int=
ernet Drafts. Those are obviously public and the authors are identified, an=
d the state apparatus can read them just fine, regardless of how secure we =
make them.

So there are two kinds of communications that we would seek to protect. pub=
lic statements made anonymously, and private statements made either person-=
to-person or within a small group. You can't avoid any kind of monitoring, =
pervasive or otherwise, without having both encryption and authentication. =
This is regardless of whether the encryption and authentication are with th=
e communications peer or with an anonymizer. Encryption and authentication =
with a middlebox (such as using a web-based mail service with TLS) is not s=
ufficient, as the privacy of the communications depends on both the trustwo=
rthiness of the intermediary and strength of the authentication that the in=
termediary performs. I think it would be naive to expect an intermediary pr=
oviding a web service to resist the government. So we're left with mandator=
y mutual authentication.

And that's the issue. We (meaning the people who work on Internet infrastru=
cture) have never been able to deploy an identity management system good en=
ough that everyone will use it.

I am not familiar enough with Ugandan politics to know to what extent the a=
nti-gay laws are enforced or investigated. Most European countries and US s=
tates had such laws for decades without the police ever expending any resou=
rces to catch the criminals. But from what I've read in Wikipedia, the huma=
n rights situation is pretty grim for gays. So although it's tempting to th=
ink that using a US-based service like GMail would be safe from the local g=
overnment, I don't think that's good enough to merit an unqualified "yes" a=
nswer to your question. The thing about pervasive monitoring, is that even =
if it was set up to catch terrorists, once the system is in place, it's ver=
y tempting to use the collected information to fight crime.

If the Ugandan government has decided to investigate a specific person, the=
y can big his phone, install spyware on his computer, and follow him around=
. They will find evidence. The best we can do is to make our protocols such=
 that pervasive surveillance is impossible. We can only hope, that if surve=
illance resistance is made such that the US government has the resources to=
 spy on 10,000 people while Uganda has the resources to spy on 9 people (ba=
sed on the ratio of national budget expenditures), that the Ugandan governm=
ent will not waste its precious 9 "slots" on tracking down homosexuals.

So while I don't think we can make any particular protocol safe for a suspe=
ct, we can make it so that the average person feels safe enough to risk pri=
vate communications as long as they believe they are "under the radar".  Id=
eally, the steps to reach that goal would be enough to obscure the few who =
do use strong person-to-person authentication.

But even with strong person-to-person authentication, a gay Ugandan would s=
till have to avoid discussing anything that is illegal in Uganda with peopl=
e he's not familiar enough with, for fear they are government agents. There=
 can be no online support group helping teenagers, and there can be no Inte=
rnet dating sites. Nothing we do can make that happen.

Yoav


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<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; ">
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<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space; ">
<div>
<div>On Oct 20, 2013, at 4:21 AM, Ted Hardie &lt;<a href=3D"mailto:ted.ietf=
@gmail.com">ted.ietf@gmail.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<blockquote type=3D"cite">
<div dir=3D"ltr">
<div>
<div>Like most folks involved in this list, I have a personal response to t=
he current situation and some thoughts on how it will impact my or our work=
 in the future.&nbsp; Since I expect we will pretty short of mic time in Va=
ncouver for thoughts like these, I decided
 to write them out.<br>
<br>
<a href=3D"http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00">h=
ttp://tools.ietf.org/html/draft-hardie-perpass-touchstone-00</a><br>
<br>
</div>
is the result.&nbsp; It's quite short but a quick summary is this:<br>
<br>
Pervasive monitoring induces self-censoring which harms the Internet and it=
s users.&nbsp; At the scale of the modern Internet, that means it harms hum=
anity.<br>
<br>
We can and should change our approach to Internet engineering and system de=
sign to deal with this.&nbsp; There will be costs for that, but we should p=
ay them.<br>
<br>
It helps me, personally, to focus on a single user when asking whether a sy=
stem or protocol is appropriate in the current environment.&nbsp; The draft=
 lays out why.<br>
<br>
</div>
regards,<br>
<br>
Ted Hardie<br>
</div>
</blockquote>
<br>
</div>
<div>Hi, Ted</div>
<div><br>
</div>
<div>In your draft, you propose we ask ourselves a question about any proto=
col we design, and that question can be something like &quot;Can a gay kid =
in Uganda use this safely?&quot;</div>
<div><br>
</div>
<div>IMO nothing we do here can yield an unqualified &quot;yes&quot; answer=
 to that question. Nothing here relates to public statements such as person=
al blogs or Internet Drafts. Those are obviously public and the authors are=
 identified, and the state apparatus can read
 them just fine, regardless of how secure we make them.</div>
<div><br>
</div>
<div>So there are two kinds of communications that we would seek to protect=
. public statements made anonymously, and private statements made either pe=
rson-to-person or within a small group. You can't avoid any kind of monitor=
ing, pervasive or otherwise, without
 having both encryption and authentication. This is regardless of whether t=
he encryption and authentication are with the communications peer or with a=
n anonymizer. Encryption and authentication with a middlebox (such as using=
 a web-based mail service with TLS)
 is not sufficient, as the privacy of the communications depends on both th=
e trustworthiness of the intermediary and strength of the authentication th=
at the intermediary performs. I think it would be naive to expect an interm=
ediary providing a web service to
 resist the government. So we're left with mandatory mutual authentication.=
</div>
<div><br>
</div>
<div>And that's the issue. We (meaning the people who work on Internet infr=
astructure) have never been able to deploy an identity management system go=
od enough that everyone will use it.</div>
<div><br>
</div>
<div>I am not familiar enough with Ugandan politics to know to what extent =
the anti-gay laws are enforced or investigated. Most European countries and=
 US states had such laws for decades without the police ever expending any =
resources to catch the criminals.
 But from what I've read in Wikipedia, the human rights situation is pretty=
 grim for gays. So although it's tempting to think that using a US-based se=
rvice like GMail would be safe from the local government, I don't think tha=
t's good enough to merit an unqualified
 &quot;yes&quot; answer to your question. The thing about pervasive monitor=
ing, is that even if it was set up to catch terrorists, once the system is =
in place, it's very tempting to use the collected information to fight crim=
e.</div>
<div><br>
</div>
<div>If the Ugandan government has decided to investigate a specific person=
, they can big his phone, install spyware on his computer, and follow him a=
round. They will find evidence. The best we can do is to make our protocols=
 such that pervasive surveillance
 is impossible. We can only hope, that if surveillance resistance is made s=
uch that the US government has the resources to spy on 10,000 people while =
Uganda has the resources to spy on 9 people (based on the ratio of national=
 budget expenditures), that the
 Ugandan government will not waste its precious 9 &quot;slots&quot; on trac=
king down homosexuals.</div>
<div><br>
</div>
<div>So while I don't think we can make any particular protocol safe for a =
suspect, we can make it so that the average person feels safe enough to ris=
k private communications as long as they believe they are &quot;under the r=
adar&quot;. &nbsp;Ideally, the steps to reach that
 goal would be enough to obscure the few who do use strong person-to-person=
 authentication.&nbsp;</div>
<div><br>
</div>
<div>But even with strong person-to-person authentication, a gay Ugandan wo=
uld still have to avoid discussing anything that is illegal in Uganda with =
people he's not familiar enough with, for fear they are government agents. =
There can be no online support group
 helping teenagers, and there can be no Internet dating sites. Nothing we d=
o can make that happen.&nbsp;</div>
<div><br>
</div>
<div>Yoav</div>
</div>
</div>
<br>
</body>
</html>

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From rutkowski.tony@gmail.com  Sun Oct 20 05:39:59 2013
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Date: Sun, 20 Oct 2013 08:39:49 -0400
From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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Reality check.

That is assuming the "average person" or the providers
of services to such persons, cares enough to do anything.
If the past ten years have demonstrated anything, the
average person and provider do not care.  Indeed,
conversely, they will be concerned about cost,
performance, ease of use,  and attractive feature sets.

Only the non-average will care in the following order:
governments (mostly), companies communicating
sensitive information, criminals and terrorists, and
a few super-paranoid.

The latest traitor-theft incident has principally
accomplished: 1) a significant shift of resources
by almost all the other governments to scale up
their ability to do better pervasive surveillance,
2) the significant scaling of surveillance and
analysis vendors to sell into the expanding
government and commercial markets, 3) the
shift of criminals and terrorists to more secure
communication, and 4) a degree of largely self
serving flailing around for exploitation purposes
by politicians and lobbying groups.  Perpass falls
into the noise, except for generating new ideas
for the above actors.  It is called the law of
unintended consequences. :-)
-t

On 2013-10-20 5:28 AM, Yoav Nir wrote:
> So while I don't think we can make any particular protocol safe for a 
> suspect, we can make it so that the average person feels safe enough 
> to risk private communications as long as they believe they are "under 
> the radar".  Ideally, the steps to reach that goal would be enough to 
> obscure the few who do use strong person-to-person authentication.
>


From stephen.farrell@cs.tcd.ie  Sun Oct 20 06:47:30 2013
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Subject: Re: [perpass] NSA inspired PKIX limitations?
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Hi Phill,

On 10/19/2013 06:48 PM, Phillip Hallam-Baker wrote:
> On Sat, Oct 19, 2013 at 11:46 AM, Stephen Farrell <stephen.farrell@cs.tcd.ie
>> wrote:
> 
>>
>> Hiya,
>>
>> FWIW, I don't buy Phill's theory at all.
>>
> 
> We have a document that states there is a $250 million budget set for a
> program that includes infiltrating the standards process as a stated part
> of the program.

I'll come back on that in a separate mail.

> Now we can dispute the authenticity of the document but I see it as
> confirming my earlier strong suspicion.
> 
>> On the specific topics below, if I recall correctly, both
>> were uncontroversial parts of the "design" of PKI for years
>> before they became problematic for the web PKI when it
>> finally started to seriously consider revocation.
> 
> 
> They were uncontroversial until the DigiNotar and Flame incidents and until
> the EFF certificate observatory started a FUD attack making spurious claims
> . Until that point I was mainly concerned with the risk that one of my CAs
> might be breached. I did not see the need for Name constraints because I
> had other controls that I consider to be sufficient.
> 
> The OCSP feature was very controversial at the time the limitation was
> originally introduced. The reason I did not press the issue then was that I
> did not see it as critical and insisting on a strong status result could
> arguably be seen as interfering with the Valicert business model at the
> time.

Right, I tihnk we're agreeing that these features were introduced
years ago as part of the normal process. No conspiracy needed nor
credible.

>> And it
>> seems to me that both "sides" in that debate were inflexible
>> and unwilling to make changes. I still don't know why that
>> was, and it still seems dumb to me, but life's full of little
>> mysteries like that.
>>
> 
> My position is based on the actions taken by the deployed base. I can't
> change that and so I don't have much ability to change my position.
> 
> I can't see why the inability of the DoD to support an accurate status
> result should require the rest of us to adopt their lowest common
> denominator security.

That's re-litigating the argument though. You had your position,
others had theirs. All of 'em had merits. None of the relevant
parties seemed willing to change. 'twas just dumb IMO.

However, we now have the wpkops wg, which should provide a better
venue and process for handling any similar issues that arise in
future. If the web PKI folks do actively work on that, (and I'm
more hopeful on that than I was a month or two ago) then we
shouldn't hit that kind of problem again I'd hope.

>> And I am just not seeing how this is related to pervasive
>> monitoring except very very tangentially - Phill, can you
>> please explain its relevance?
>>
> 
> I believe that the vulnerability exploited in Flame would have been closed
> had the standards changes resisted by the DoD been adopted in a timely

Flame was relatively targetted and more of a host-based attack tool
rather than an attack on the n/w. But yes, its relevant to monitoring
though arguable as to whether its in scope here I think. (I do agree
its a relevant part of the background for sure though.)

> fashion and that the DigiNotar incident might have been detected earlier.

Again, that's fairly weak I think.

> The documentary evidence shows that interfering with the standards process
> to prevent deployment of countermeasures is part of the cost of running
> PRISM etc. That is a cost that I am not prepared to pay because these
> generals who I have to sit in rooms with and listen to their plans for
> cyber-attack are making use less safe by compromising our ability to
> achieve strong cyber-defense.
> 
> The question of how we can build open standards to defend against covert
> pervasive monitoring in the face of attempts to disrupt these efforts is a
> very difficult one.

I'll respond in a separate mail on the general inferference issue.

My conclusion here is that the specific issues you raise aren't
convincingly part of this and is better not intertwined with the
generic point about interference.

S.

>> And finally the subject line also seems unwise as it'll probably
>> just annoy folks and just distract us from getting real work
>> done. (So, if it does annoy you, please try be moderate in
>> your response, or maybe don't even send that mail, until we
>> see how Phill justifies its relevance.)
>>
> 
> Well we could spend the next few years dancing round the subject and
> pretending that the elephants are not in the room but I have no intention
> of doing so.
> 
> Now that my question on Alexander has been answered, I am looking for an
> answer to the question I raised at the RSA conference this year: How can we
> have a government-industry partnership to improve cyber security when a
> part of the military is actively engaged in subverting the standards
> process to protect vulnerabilities they might use in attacks? This is not
> the only forum I am raising this question, I am raising it with the policy
> makers in government as well.
> 
> I am quite used to being accused of peddling an agenda. For some reasons
> CAs are always accused of having some covert agenda and raising this on the
> lists is never seen as objectionable because it is so frequent. But the
> response I give is not 'how dare you ask that question' but instead 'why
> don't you hold all the other parties you rely on to the same degree of
> scrutiny'.
> 
> 

From stephen.farrell@cs.tcd.ie  Sun Oct 20 06:52:40 2013
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Date: Sun, 20 Oct 2013 14:52:31 +0100
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Subject: [perpass] spending US$250M per year
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Hi,

Phill raised the US$250M/year issue. [1] That is something we
might prefer to ignore, but perhaps its better to address it
briefly, and then move on if we can.

In fact, I don't think its impact is that significant, except
in so far as it has damaged the reputation of some, and there is
real reputational damage to institutions and even, very unfairly,
maybe to some individuals.

FWIW, my take on this is the following:

1. The only convincingly known case so far is dual-ec-dbrg.
There are no others that I'm aware of, and none directly
involving the IETF. There was some discussion of IPsec but
Jeff Schiller convincingly countered that, and Jeff's
account matches my recollection (not that I was really
involved in that at the time). The "NIST Curve" topic is I
think different and is being actively discussed on the TLS
list. (The difference is that the NIST curve debate is a
result of, and not a cause of, reputational damage.)

2. It seems unlikely to me, and others who've mailed me offlist,
that anyone was being directly paid as part of this solely to
deliberately bugger up IETF processes or output by participating
in IETF activities. I can't imagine that funders with such motives
would be that unsubtle and direct - they'd find someone who
genuinely thinks that e.g. more complexity is needed for "foo"
and fund them or even better they'd fund someone who has real
requirements that suit the funder's needs - same as every funder.

3. Other than the scale, such activities are not that different
from when vendor X plays a game against vendor Y proposals
or technologies while at the same time both vendors contribute
fairly in other areas. Our defence is the same: transparency,
running our processes, broad participation and thorough technical
review.

4. I'd have to imagine that most of that US$250M is spent outside
of standards work, e.g. to pay vendors or service providers to
do stuff that works for the funder, whether duplicitously or not.

5. I feel real sympathy for individual IETF participants sponsored
by USG organisations - all of those folks I know have afaik been
totally honest and above-board contributors. (Doesn't mean I agree
with 'em of course:-) But I can't see but that there is real damage
to trust there maybe mostly for IETF participants who don't
personally know the people involved. That's a shame but I don't
this folks funded by USG ought be silent - that'd make the overall
situation worse same as any self-censorship.

6. There's really not much point in saying more on this. Its a PITA,
but absent a smoking-gun like dual-ec-dbrg, speculating on this
is going to be counterproductive. Sure, we should review our stuff
and see what needs changing/improvement but doing so on the basis of
who paid whom is both very hard to do accurately and probably
pointless. (As an aside - if you're reading this and have written
some RFCs - have you looked over what you did to check how it might
need changing?)

7. We should all definitely avoid any finger pointing at individuals
both in fairness and for all the usual other reasons why we don't
defame people on mailing lists. As list moderator, I'll slap down
as hard as I can on any such mail, so please continue to not send
anything like that. (And thanks for not doing it so far.)

8. If they insist on spending that money, they should just buy us
loads of gigantic cookies for meetings. The discussion that'd ensue
would kill productivity far more effectively:-)

If the above summary covered this, then I'd hope we can move on and
not need much or any more discussion on the topic, but do folks think
I'm wrong or missing important aspects?

If this is close-enough, then you don't need to respond.

Regards,
S.

[1]
http://www.theguardian.com/world/2013/sep/05/nsa-gchq-encryption-codes-security




From mdietf@demmers.org  Sun Oct 20 10:09:07 2013
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Date: Sun, 20 Oct 2013 10:08:37 -0700
From: Mike Demmers <mdietf@demmers.org>
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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On Sat, 19 Oct 2013 18:21:31 -0700
Ted Hardie <ted.ietf@gmail.com> wrote:

> http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00

Suggest change from:

   "Can a gay kid in Uganda use this safely?"

to

   "Can a gay kid in Uganda use this safely? Is its design flexible enough to be used in his circumstances? Is it easy enough to use that a non-technical user may be reasonably be expected to use it?"

I'd guess you intended this. I think it is important to spell it out explicitly.

-Mike
 

From tytso@thunk.org  Sun Oct 20 10:20:14 2013
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Date: Sun, 20 Oct 2013 13:20:06 -0400
From: Theodore Ts'o <tytso@mit.edu>
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Cc: Ted Hardie <ted.ietf@gmail.com>, Yoav Nir <ynir@checkpoint.com>, "<perpass@ietf.org>" <perpass@ietf.org>
Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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On Sun, Oct 20, 2013 at 08:39:49AM -0400, Tony Rutkowski wrote:
> 
> That is assuming the "average person" or the providers
> of services to such persons, cares enough to do anything.
> If the past ten years have demonstrated anything, the
> average person and provider do not care.  Indeed,
> conversely, they will be concerned about cost,
> performance, ease of use,  and attractive feature sets.

As they say, past results is not necessarily indicative of future
performance.

There seem to be at least some evidence that "normal users" have
started to care more about their security --- or you could say that
there have been a greater number of people joining the ranks of the
"super-paranoid".  And Yahoo has announced they will start turning on
encryption by default starting early next year; some have speculated
that Yahoo may have been felt impact of the reporting that showed that
the NSA had collected twice as many address books from Yahoo Users as
from all of the other major services combined.

One interesting indicator of how much "the average person" will care
is how much pressure politicians feel from their constiuents when some
of the intelligence gathering reform bills start getting debated
before congress --- especially the bill from Senators Wyden and Udall.

> Perpass falls
> into the noise, except for generating new ideas
> for the above actors.

People who feel this way certainly have no obligation to participate
in perpass.  :-)

					- Ted

From mdietf@demmers.org  Sun Oct 20 12:31:14 2013
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Date: Sun, 20 Oct 2013 12:31:02 -0700
From: Mike Demmers <mdietf@demmers.org>
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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On Sat, 19 Oct 2013 22:04:06 -0400
Eitan Adler <lists@eitanadler.com> wrote:

> You may want to directly address the arguments made in the paper
> "Tussle in Cyberspace: Defining Tomorrow=E2=80=99s Internet" by Clark et =
al.

Yes.

That paper, located here:

http://groups.csail.mit.edu/ana/Publications/PubPDFs/Tussle%20in%20Cyberspa=
ce%20Defining%20Tomorrows%20Internet%202005's%20Internet.pdf

is excellent and directly relevant to the design of protocols. Written in 2=
005.

-md

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Hi Yoav,

Thanks for reading the draft; some comments in-line.

On Sun, Oct 20, 2013 at 1:47 AM, Yoav Nir <ynir@checkpoint.com> wrote:

>
>  On Oct 20, 2013, at 4:21 AM, Ted Hardie <ted.ietf@gmail.com> wrote:
>
>   Like most folks involved in this list, I have a personal response to
> the current situation and some thoughts on how it will impact my or our
> work in the future.  Since I expect we will pretty short of mic time in
> Vancouver for thoughts like these, I decided to write them out.
>
> http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00
>
>  is the result.  It's quite short but a quick summary is this:
>
> Pervasive monitoring induces self-censoring which harms the Internet and
> its users.  At the scale of the modern Internet, that means it harms
> humanity.
>
> We can and should change our approach to Internet engineering and system
> design to deal with this.  There will be costs for that, but we should pay
> them.
>
> It helps me, personally, to focus on a single user when asking whether a
> system or protocol is appropriate in the current environment.  The draft
> lays out why.
>
>  regards,
>
> Ted Hardie
>
>
>  Hi, Ted
>
>  In your draft, you propose we ask ourselves a question about any
> protocol we design, and that question can be something like "Can a gay kid
> in Uganda use this safely?"
>
>  IMO nothing we do here can yield an unqualified "yes" answer to that
> question. Nothing here relates to public statements such as personal blogs
> or Internet Drafts. Those are obviously public and the authors are
> identified, and the state apparatus can read them just fine, regardless of
> how secure we make them.
>
>
I think we agree that there can be no unqualified "yes"; even if the
protocol and application are secure, there is always the risk of the camera
looking over your shoulder.

But I want to point out something about blogs or similar public statements;
while some systems require real names, not all do.  It's quite possible to
have an online journal or blog that uses a pseudonym and it's actually
relatively easy for that to be an okay outlet for a gay kid worried about
pervasive surveillance.  If that kid connects to largeblogsite.example over
a TLS protected link, the metadata shows the connection, but not the
content.  If largeblogsite has blogs on knitting, agriculture, and custom
cars, there is no signal to those engaged in surveillance that the blogs of
interest are LGBT in nature.  The authentication of largeblogsite.example
within TLS to the user needs to be secure (pinned to a CA, for example, to
avoid MiTM proxies), but there are various ways of making this more trusted
(again, no way to avoid all risk; if the CA is compromised, most bets are
off).

This doesn't gainsay the main point about safety, but it shows how thinking
about a particular user or group of users may actually make the general
privacy considerations more concrete.



>  So there are two kinds of communications that we would seek to protect.
> public statements made anonymously, and private statements made either
> person-to-person or within a small group. You can't avoid any kind of
> monitoring, pervasive or otherwise, without having both encryption and
> authentication. This is regardless of whether the encryption and
> authentication are with the communications peer or with an anonymizer.
> Encryption and authentication with a middlebox (such as using a web-based
> mail service with TLS) is not sufficient, as the privacy of the
> communications depends on both the trustworthiness of the intermediary and
> strength of the authentication that the intermediary performs. I think it
> would be naive to expect an intermediary providing a web service to resist
> the government. So we're left with mandatory mutual authentication.
>
>
> I think this presumes that there is a single government and a single
potential response from a web service.  That may not be valid.  If it is,
and you don't trust a particular service provider,  then mutual
authentication doesn't actually do much for you.  You need confidentiality
among participants without the participation of the service provider.
There are ways to achieve that, but they are not common nor are they
currently deployed at scale.  That may change. That may help with the point
you raise below, that the use of some techniques is currently a signal to
deepen the level of surveillance on an individual; if they become common,
that signal is lost to those who wish to follow those trails.



>
 And that's the issue. We (meaning the people who work on Internet
> infrastructure) have never been able to deploy an identity management
> system good enough that everyone will use it.
>
>  I am not familiar enough with Ugandan politics to know to what extent
> the anti-gay laws are enforced or investigated. Most European countries and
> US states had such laws for decades without the police ever expending any
> resources to catch the criminals. But from what I've read in Wikipedia, the
> human rights situation is pretty grim for gays. So although it's tempting
> to think that using a US-based service like GMail would be safe from the
> local government, I don't think that's good enough to merit an unqualified
> "yes" answer to your question.
>

I agree that it may never be unqualified.  But we can make it stronger.


> The thing about pervasive monitoring, is that even if it was set up to
> catch terrorists, once the system is in place, it's very tempting to use
> the collected information to fight crime.
>
>  If the Ugandan government has decided to investigate a specific person,
> they can big his phone, install spyware on his computer, and follow him
> around. They will find evidence. The best we can do is to make our
> protocols such that pervasive surveillance is impossible. We can only hope,
> that if surveillance resistance is made such that the US government has the
> resources to spy on 10,000 people while Uganda has the resources to spy on
> 9 people (based on the ratio of national budget expenditures), that the
> Ugandan government will not waste its precious 9 "slots" on tracking down
> homosexuals.
>
>  So while I don't think we can make any particular protocol safe for a
> suspect, we can make it so that the average person feels safe enough to
> risk private communications as long as they believe they are "under the
> radar".  Ideally, the steps to reach that goal would be enough to obscure
> the few who do use strong person-to-person authentication.
>
>  But even with strong person-to-person authentication, a gay Ugandan
> would still have to avoid discussing anything that is illegal in Uganda
> with people he's not familiar enough with, for fear they are government
> agents.
>

But can she see the videos of the Trevor Project?  Can he read medical
resources about HIV?   Can we assure throwaway@messageservice.example that
they are really in a chat session with counsellor@pflag.org?

All of those will help.

There can be no online support group helping teenagers, and there can be no
> Internet dating sites. Nothing we do can make that happen.
>
> I appreciate that you have thought so deeply about this particular user;
thank you.  I hope it convinces you that thinking through a specific user
case can help us make concrete the steps we need to take to make our
protocols and systems more usable in the light of pervasive surveillance.

thanks,

Ted



>  Yoav
>
>
>

--485b397dd1abf880be04e93232a9
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Yoav,<br><br></div>Thanks for reading the draft; s=
ome comments in-line.<br><div class=3D"gmail_extra"><br>On Sun, Oct 20, 201=
3 at 1:47 AM, Yoav Nir <span dir=3D"ltr">&lt;<a href=3D"mailto:ynir@checkpo=
int.com" target=3D"_blank">ynir@checkpoint.com</a>&gt;</span> wrote:<br>
<div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
">



<div style=3D"word-wrap:break-word"><div><div class=3D"h5">
<br>
<div>
<div>On Oct 20, 2013, at 4:21 AM, Ted Hardie &lt;<a href=3D"mailto:ted.ietf=
@gmail.com" target=3D"_blank">ted.ietf@gmail.com</a>&gt; wrote:</div>
<br>
<blockquote type=3D"cite">
<div dir=3D"ltr">
<div>
<div>Like most folks involved in this list, I have a personal response to t=
he current situation and some thoughts on how it will impact my or our work=
 in the future.=A0 Since I expect we will pretty short of mic time in Vanco=
uver for thoughts like these, I decided
 to write them out.<br>
<br>
<a href=3D"http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00" t=
arget=3D"_blank">http://tools.ietf.org/html/draft-hardie-perpass-touchstone=
-00</a><br>
<br>
</div>
is the result.=A0 It&#39;s quite short but a quick summary is this:<br>
<br>
Pervasive monitoring induces self-censoring which harms the Internet and it=
s users.=A0 At the scale of the modern Internet, that means it harms humani=
ty.<br>
<br>
We can and should change our approach to Internet engineering and system de=
sign to deal with this.=A0 There will be costs for that, but we should pay =
them.<br>
<br>
It helps me, personally, to focus on a single user when asking whether a sy=
stem or protocol is appropriate in the current environment.=A0 The draft la=
ys out why.<br>
<br>
</div>
regards,<br>
<br>
Ted Hardie<br>
</div>
</blockquote>
<br>
</div>
</div></div><div>Hi, Ted</div>
<div><br>
</div>
<div>In your draft, you propose we ask ourselves a question about any proto=
col we design, and that question can be something like &quot;Can a gay kid =
in Uganda use this safely?&quot;</div>
<div><br>
</div>
<div>IMO nothing we do here can yield an unqualified &quot;yes&quot; answer=
 to that question. Nothing here relates to public statements such as person=
al blogs or Internet Drafts. Those are obviously public and the authors are=
 identified, and the state apparatus can read
 them just fine, regardless of how secure we make them.</div>
<div><br></div></div></blockquote><div><br></div><div>I think we agree that=
 there can be no unqualified &quot;yes&quot;; even if the protocol and appl=
ication are secure, there is always the risk of the camera looking over you=
r shoulder.=A0 <br>
<br></div><div>But I want to point out something about blogs or similar pub=
lic statements; while some systems require real names, not all do.=A0 It&#3=
9;s quite possible to have an online journal or blog that uses a pseudonym =
and it&#39;s actually relatively easy for that to be an okay outlet for a g=
ay kid worried about pervasive surveillance.=A0 If that kid connects to lar=
geblogsite.example over a TLS protected link, the metadata shows the connec=
tion, but not the content.=A0 If largeblogsite has blogs on knitting, agric=
ulture, and custom cars, there is no signal to those engaged in surveillanc=
e that the blogs of interest are LGBT in nature.=A0 The authentication of l=
argeblogsite.example within TLS to the user needs to be secure (pinned to a=
 CA, for example, to avoid MiTM proxies), but there are various ways of mak=
ing this more trusted (again, no way to avoid all risk; if the CA is compro=
mised, most bets are off).<br>
<br></div><div>This doesn&#39;t gainsay the main point about safety, but it=
 shows how thinking about a particular user or group of users may actually =
make the general privacy considerations more concrete.<br></div><div><br>
=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style=3D"wo=
rd-wrap:break-word"><div>
</div>
<div>So there are two kinds of communications that we would seek to protect=
. public statements made anonymously, and private statements made either pe=
rson-to-person or within a small group. You can&#39;t avoid any kind of mon=
itoring, pervasive or otherwise, without
 having both encryption and authentication. This is regardless of whether t=
he encryption and authentication are with the communications peer or with a=
n anonymizer. Encryption and authentication with a middlebox (such as using=
 a web-based mail service with TLS)
 is not sufficient, as the privacy of the communications depends on both th=
e trustworthiness of the intermediary and strength of the authentication th=
at the intermediary performs. I think it would be naive to expect an interm=
ediary providing a web service to
 resist the government. So we&#39;re left with mandatory mutual authenticat=
ion.</div>
<div><br><br></div></div></blockquote><div>I think this presumes that there=
 is a single government and a single potential response from a web service.=
=A0 That may not be valid.=A0 If it is, and you don&#39;t trust a particula=
r service provider,=A0 then mutual authentication doesn&#39;t actually do m=
uch for you.=A0 You need confidentiality among participants without the par=
ticipation of the service provider.=A0=A0=A0 There are ways to achieve that=
, but they are not common nor are they currently deployed at scale.=A0 That=
 may change. That may help with the point you raise below, that the use of =
some techniques is currently a signal to deepen the level of surveillance o=
n an individual; if they become common, that signal is lost to those who wi=
sh to follow those trails.<br>
<br><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style=
=3D"word-wrap:break-word"><div>=A0</div></div></blockquote><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex">
<div style=3D"word-wrap:break-word"><div>
</div>
<div>And that&#39;s the issue. We (meaning the people who work on Internet =
infrastructure) have never been able to deploy an identity management syste=
m good enough that everyone will use it.</div>
<div><br>
</div>
<div>I am not familiar enough with Ugandan politics to know to what extent =
the anti-gay laws are enforced or investigated. Most European countries and=
 US states had such laws for decades without the police ever expending any =
resources to catch the criminals.
 But from what I&#39;ve read in Wikipedia, the human rights situation is pr=
etty grim for gays. So although it&#39;s tempting to think that using a US-=
based service like GMail would be safe from the local government, I don&#39=
;t think that&#39;s good enough to merit an unqualified
 &quot;yes&quot; answer to your question. <br></div></div></blockquote><div=
><br></div><div>I agree that it may never be unqualified.=A0 But we can mak=
e it stronger.<br></div><div>=A0</div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddi=
ng-left:1ex">
<div style=3D"word-wrap:break-word"><div>The thing about pervasive monitori=
ng, is that even if it was set up to catch terrorists, once the system is i=
n place, it&#39;s very tempting to use the collected information to fight c=
rime.</div>

<div><br>
</div>
<div>If the Ugandan government has decided to investigate a specific person=
, they can big his phone, install spyware on his computer, and follow him a=
round. They will find evidence. The best we can do is to make our protocols=
 such that pervasive surveillance
 is impossible. We can only hope, that if surveillance resistance is made s=
uch that the US government has the resources to spy on 10,000 people while =
Uganda has the resources to spy on 9 people (based on the ratio of national=
 budget expenditures), that the
 Ugandan government will not waste its precious 9 &quot;slots&quot; on trac=
king down homosexuals.</div>
<div><br>
</div>
<div>So while I don&#39;t think we can make any particular protocol safe fo=
r a suspect, we can make it so that the average person feels safe enough to=
 risk private communications as long as they believe they are &quot;under t=
he radar&quot;. =A0Ideally, the steps to reach that
 goal would be enough to obscure the few who do use strong person-to-person=
 authentication.=A0</div>
<div><br>
</div>
<div>But even with strong person-to-person authentication, a gay Ugandan wo=
uld still have to avoid discussing anything that is illegal in Uganda with =
people he&#39;s not familiar enough with, for fear they are government agen=
ts.</div>
</div></blockquote><div><br><div>But can she see the videos of the Trevor P=
roject?=A0 Can he read medical resources about HIV?=A0=A0 Can we assure thr=
owaway@messageservice.example that they are really in a chat session with <=
a href=3D"mailto:counsellor@pflag.org">counsellor@pflag.org</a>?<br>
<br></div><div>All of those will help.<br></div><div><br></div></div><block=
quote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1=
px solid rgb(204,204,204);padding-left:1ex"><div style=3D"word-wrap:break-w=
ord">
<div> There can be no online support group
 helping teenagers, and there can be no Internet dating sites. Nothing we d=
o can make that happen.=A0</div><span class=3D""><font color=3D"#888888">
<div><br></div></font></span></div></blockquote>I appreciate that you have =
thought so deeply about this particular user; thank you.=A0 I hope it convi=
nces you that thinking through a specific user case can help us make concre=
te the steps we need to take to make our protocols and systems more usable =
in the light of pervasive surveillance.<br>
<br>thanks,<br><br>Ted<br></div><div class=3D"gmail_quote"><br><div>=A0</di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex"><div style=3D"word-wrap=
:break-word">
<span class=3D""><font color=3D"#888888"><div>
</div>
<div>Yoav</div>
<div><br>
</div>
<br>
</font></span></div>

</blockquote></div><br></div></div>

--485b397dd1abf880be04e93232a9--

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On Sun, Oct 20, 2013 at 5:39 AM, Tony Rutkowski <rutkowski.tony@gmail.com>wrote:

> Reality check.
>
> That is assuming the "average person" or the providers
> of services to such persons, cares enough to do anything.
> If the past ten years have demonstrated anything, the
> average person and provider do not care.  Indeed,
> conversely, they will be concerned about cost,
> performance, ease of use,  and attractive feature sets.
>
>
I think we are increasingly aware of folks who do care; journalists, for
example, are pretty sensitized at the moment to these issues.



> Only the non-average will care in the following order:
> governments (mostly), companies communicating
> sensitive information, criminals and terrorists, and
> a few super-paranoid.
>
> The latest traitor-theft incident has principally
> accomplished: 1) a significant shift of resources
> by almost all the other governments to scale up
> their ability to do better pervasive surveillance,
> 2) the significant scaling of surveillance and
> analysis vendors to sell into the expanding
> government and commercial markets, 3) the
> shift of criminals and terrorists to more secure
> communication, and 4) a degree of largely self
> serving flailing around for exploitation purposes
> by politicians and lobbying groups.  Perpass falls
> into the noise,


I think you and I disagree pretty fundamentally on this topic.  I think our
work can be signal that rises above the noise.  It's up to us to determine
whether or not we'll spend our efforts boosting the signal or not.

Ted Hardie




> except for generating new ideas
> for the above actors.  It is called the law of
> unintended consequences. :-)
>


> -t
>
>
> On 2013-10-20 5:28 AM, Yoav Nir wrote:
>
>> So while I don't think we can make any particular protocol safe for a
>> suspect, we can make it so that the average person feels safe enough to
>> risk private communications as long as they believe they are "under the
>> radar".  Ideally, the steps to reach that goal would be enough to obscure
>> the few who do use strong person-to-person authentication.
>>
>>
>

--20cf307f31fe2f8b4404e9323d2a
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">On Sun, Oct 20, 2013 at 5:39 AM, Tony Rutkowski <span dir=
=3D"ltr">&lt;<a href=3D"mailto:rutkowski.tony@gmail.com" target=3D"_blank">=
rutkowski.tony@gmail.com</a>&gt;</span> wrote:<br><div class=3D"gmail_extra=
"><div class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Reality check.<br>
<br>
That is assuming the &quot;average person&quot; or the providers<br>
of services to such persons, cares enough to do anything.<br>
If the past ten years have demonstrated anything, the<br>
average person and provider do not care. =A0Indeed,<br>
conversely, they will be concerned about cost,<br>
performance, ease of use, =A0and attractive feature sets.<br>
<br></blockquote><div><br></div><div>I think we are increasingly aware of f=
olks who do care; journalists, for example, are pretty sensitized at the mo=
ment to these issues.<br></div><div><br>=A0</div><blockquote class=3D"gmail=
_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:=
1ex">

Only the non-average will care in the following order:<br>
governments (mostly), companies communicating<br>
sensitive information, criminals and terrorists, and<br>
a few super-paranoid.<br>
<br>
The latest traitor-theft incident has principally<br>
accomplished: 1) a significant shift of resources<br>
by almost all the other governments to scale up<br>
their ability to do better pervasive surveillance,<br>
2) the significant scaling of surveillance and<br>
analysis vendors to sell into the expanding<br>
government and commercial markets, 3) the<br>
shift of criminals and terrorists to more secure<br>
communication, and 4) a degree of largely self<br>
serving flailing around for exploitation purposes<br>
by politicians and lobbying groups. =A0Perpass falls<br>
into the noise, </blockquote><div><br></div><div>I think you and I disagree=
 pretty fundamentally on this topic.=A0 I think our work can be signal that=
 rises above the noise.=A0 It&#39;s up to us to determine whether or not we=
&#39;ll spend our efforts boosting the signal or not.=A0 <br>
<br></div><div>Ted Hardie <br></div><div><br><br>=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">except for generating new ideas<br>
for the above actors. =A0It is called the law of<br>
unintended consequences. :-)<span class=3D"HOEnZb"><font color=3D"#888888">=
<br></font></span></blockquote><div>=A0</div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
><span class=3D"HOEnZb"><font color=3D"#888888">
-t</font></span><div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
On 2013-10-20 5:28 AM, Yoav Nir wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
So while I don&#39;t think we can make any particular protocol safe for a s=
uspect, we can make it so that the average person feels safe enough to risk=
 private communications as long as they believe they are &quot;under the ra=
dar&quot;. =A0Ideally, the steps to reach that goal would be enough to obsc=
ure the few who do use strong person-to-person authentication.<br>

<br>
</blockquote>
<br>
</div></div></blockquote></div><br></div></div>

--20cf307f31fe2f8b4404e9323d2a--

From stephen.farrell@cs.tcd.ie  Sun Oct 20 13:59:27 2013
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Hi Ted,

Thanks for the draft. As you might guess from earlier discussion
on here, I think the more-than-MTI approach espoused is maybe the
right one, if we can figure out how to state the requirement well.
Have you any ideas on that, or on how we could get towards a
situation where that gained consensus?

I've a similar question wrt how to "consider more carefully and
more consistently the effects of information leakage by DNS and
other infrastructure" - any ideas how an effort in that direction
could usefully be structured?

Ta,
S.

On 10/20/2013 02:21 AM, Ted Hardie wrote:
> Like most folks involved in this list, I have a personal response to the
> current situation and some thoughts on how it will impact my or our work in
> the future.  Since I expect we will pretty short of mic time in Vancouver
> for thoughts like these, I decided to write them out.
> 
> http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00
> 
> is the result.  It's quite short but a quick summary is this:
> 
> Pervasive monitoring induces self-censoring which harms the Internet and
> its users.  At the scale of the modern Internet, that means it harms
> humanity.
> 
> We can and should change our approach to Internet engineering and system
> design to deal with this.  There will be costs for that, but we should pay
> them.
> 
> It helps me, personally, to focus on a single user when asking whether a
> system or protocol is appropriate in the current environment.  The draft
> lays out why.
> 
> regards,
> 
> Ted Hardie
> 
> 
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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--001a11c37a08201ffd04e932ae1c
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On Sun, Oct 20, 2013 at 1:20 PM, Theodore Ts'o <tytso@mit.edu> wrote:

> On Sun, Oct 20, 2013 at 08:39:49AM -0400, Tony Rutkowski wrote:
> >
> > That is assuming the "average person" or the providers
> > of services to such persons, cares enough to do anything.
> > If the past ten years have demonstrated anything, the
> > average person and provider do not care.  Indeed,
> > conversely, they will be concerned about cost,
> > performance, ease of use,  and attractive feature sets.
>
> As they say, past results is not necessarily indicative of future
> performance.
>

It occurred to me the other day that many security mechanisms suffer from
the same problem as a Ponzi scheme: Bernie Madoff's investment fund never
missed a payment till the day it collapsed and all the money was gone.

Which is why I don't like arguments based on probability because the
probability you will be paid in full in a Ponzi scheme is 100% right up to
the day that they close their doors at which point the probability drops to
0%.


There are ways round this problem however. What I am doing at the moment is
to look at measures of the work factor that take into account things like
the time the effort is required, the monetary costs, the personnel etc.

--001a11c37a08201ffd04e932ae1c
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">On Sun, Oct 20, 2013 at 1:20 PM, Theodore Ts&#39;o <span d=
ir=3D"ltr">&lt;<a href=3D"mailto:tytso@mit.edu" target=3D"_blank">tytso@mit=
.edu</a>&gt;</span> wrote:<br><div class=3D"gmail_extra"><div class=3D"gmai=
l_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im">On Sun, Oct 20, 2013 at 08=
:39:49AM -0400, Tony Rutkowski wrote:<br>
&gt;<br>
&gt; That is assuming the &quot;average person&quot; or the providers<br>
&gt; of services to such persons, cares enough to do anything.<br>
&gt; If the past ten years have demonstrated anything, the<br>
&gt; average person and provider do not care. =A0Indeed,<br>
&gt; conversely, they will be concerned about cost,<br>
&gt; performance, ease of use, =A0and attractive feature sets.<br>
<br>
</div>As they say, past results is not necessarily indicative of future<br>
performance.<br></blockquote><div><br></div><div>It occurred to me the othe=
r day that many security mechanisms suffer from the same problem as a Ponzi=
 scheme: Bernie Madoff&#39;s investment fund never missed a payment till th=
e day it collapsed and all the money was gone.</div>
<div><br></div><div>Which is why I don&#39;t like arguments based on probab=
ility because the probability you will be paid in full in a Ponzi scheme is=
 100% right up to the day that they close their doors at which point the pr=
obability drops to 0%.</div>
<div><br></div><div><br></div><div>There are ways round this problem howeve=
r. What I am doing at the moment is to look at measures of the work factor =
that take into account things like the time the effort is required, the mon=
etary costs, the personnel etc.=A0</div>
<div><br></div><div><br></div></div>
</div></div>

--001a11c37a08201ffd04e932ae1c--

From derhoermi@gmx.net  Sun Oct 20 14:32:09 2013
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From: Bjoern Hoehrmann <derhoermi@gmx.net>
To: Ted Hardie <ted.ietf@gmail.com>
Date: Sun, 20 Oct 2013 23:32:02 +0200
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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* Ted Hardie wrote:
>But I want to point out something about blogs or similar public statements;
>while some systems require real names, not all do.  It's quite possible to
>have an online journal or blog that uses a pseudonym and it's actually
>relatively easy for that to be an okay outlet for a gay kid worried about
>pervasive surveillance.  If that kid connects to largeblogsite.example over
>a TLS protected link, the metadata shows the connection, but not the
>content.  If largeblogsite has blogs on knitting, agriculture, and custom
>cars, there is no signal to those engaged in surveillance that the blogs of
>interest are LGBT in nature.

I was under the impression that TLS as currently deployed would still
let an attacker know roughly when and how many bytes are exchanged and
if the blogs are reasonably static and public that should be enough to
reconstruct which are being read, especially if you can capture repeat
visits (the knitting blog might feature small vector graphics with
knitting patterns, and the custom cars blog might have large photos,
so if the user downloads a lot, custom cars are much more likely).

(And in practise there are many more problems, like the blogs might be
on different hostnames and the DNS lookup gives you away, or they might
load resources from third-party hosts, so you can tell blogs that have
some video from a popular video site on them from those that have not,
simply from the client connecting to the video service after loading up
whatever blog they are interested in, and so on.)
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Dear Ned,

Good questions. See comments inline.

On Oct 19, 2013, at 2:48 PM, Ned Freed <ned.freed@mrochek.com> wrote:

>>> You're still not answering the question, at least directly, and I =
really want a
>>> direct answer. More expensive for whom? The vast majority of current =
and likely
>>> future email users, who seem perfectly happy to use the service =
offerings of
>>> large ISPs and MSPs? If so, then any proposal you come up with needs =
to done in
>>> a way that persuades those providers that making changes to their =
service
>>> offerings is the right thing for them to do.
>=20
>> Dear Ned,
>=20
>> Improving the efficiency of email acceptance might be this incentive. =
 As
>> IPv6 becomes pervasive, an authenticated domain source as a basis is =
likely to
>> be more sustainable over time.  Establishing expectations that =
StartTLS
>> confirms both server and client certificates affords improved =
transactional
>> protection from spoofing or reputation poisoning, especially with the
>> transparency and economy afforded by DANE for protection from simple
>> monitoring, malicious spoofing, and reputation poisoning.  Providers =
will need
>> to be trustworthy and may need to reside in specific geopolitical =
regions
>> willing to ensure such protections.
>=20
> I must be missing something here, because I don't see how what we've =
been
> discussing - preventing pervasive surveilance in general and mandating
> SSL/TLS on more connections in particular - has anything to do with =
email
> acceptance.

This is achieved by StartTLS exchanging BOTH client and server =
certificates.  While indeed security concerns are normally related with =
destinations of account access over web, IMAP, and POP where the client =
is authenticated using other means, it is important not to overlook the =
lack of privacy protection afforded plaintext exchanges over SMTP.  =
Internet exchange in plaintext is exposed to undetectable surveillance =
not requiring any provider cooperation.  Deprecating use of plaintext =
exchange for what should be considered "private" user-to-user =
communications would force governments and providers to use expressed =
policies.  Any plaintext exchange should be considered "public" =
especially when warrantless wiretapping has become the norm since 2007 =
with legal clarifications suggesting "information gathering" is not =
"electronic surveillance".  This can lead to Orwellian concerns of "self =
censorship" through various forms of suppression and ostracism.

Private exchanges should be able to use encryption as the prevalent mode =
for all exchanges.  With SMTP, encrypted exchanges immediately confront =
a lack of source authentication necessary to defend the service from =
pervasive abuse.  With IPv4, a lack of source authentication is =
supplanted by reliance on the IP address as a basis for acceptance.  =
This practice has many drawbacks such as preventing the effective use of =
IPv6 that could be remedied by validating the client certificate used in =
what would have been a plaintext port 25 exchange and its related loss =
of privacy.

>> Multiple keying of encrypted data where each key subset resides in =
different
>> geopolitical regions might be a way to increase trust, but this is =
not
>> off-the-shelf crypto which you state as a requirement.
>=20
> The security of IMAP and similar mailbox manipulation protocols seems=20=

> entirely divorced from what you're talking about.

Almost.  There are some delivery schemes that do not depend upon privacy =
protections afforded by the infrastructure.  For example, Trend acquired =
an identify based keying product developed by the University of Bristol =
back in 2002.  Here is a white paper created by the Enterprise Strategy =
Group.
=
http://www.trendmicro.com/cloud-content/us/pdfs/business/white-papers/wp_t=
rue-costs-of-email-encryption_analyst-esg.pdf

It uses Identity Base Encryption (IBE) a derivative of PKI, but with =
simple identity attributes.  Rather than depending on CAs, Central Trust =
Authority (CTA) is used instead.  Because destination addresses decode =
the symmetric key, only that portion of the message is uniquely =
encrypted.  This allows one image to be sent to several destinations =
where only those intended to see the message are able to decrypt.  This =
approach allows enterprises a means to inspect for data leaks to comply =
with governmental requirements not practical with S/MIME or OpenPGP =
unless key management and encryption has been centralized.  As such, =
this means a portion of the message path could be exposed.  After =
speaking with the developer of this technology, one of the features =
envisioned from this approach was to require the use of multiple CTAs =
each located in different geo-political regions to prevent any =
unilateral governmental action defeating message privacy.

If there is any interest in this technology, perhaps I could then =
request my management share its terms and conditions and more of the =
underlying details.

Regards,
Douglas Otis





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<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; ">Dear =
Ned,<div><br></div><div>Good questions. See comments =
inline.</div><div><br></div><div>On Oct 19, 2013, at 2:48 PM, Ned Freed =
&lt;<a href=3D"mailto:ned.freed@mrochek.com">ned.freed@mrochek.com</a>&gt;=
 wrote:<br><br><blockquote type=3D"cite"><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: medium; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
"><blockquote type=3D"cite">You're still not answering the question, at =
least directly, and I really want a<br>direct answer. More expensive for =
whom? The vast majority of current and likely<br>future email users, who =
seem perfectly happy to use the service offerings of<br>large ISPs and =
MSPs? If so, then any proposal you come up with needs to done in<br>a =
way that persuades those providers that making changes to their =
service<br>offerings is the right thing for them to =
do.<br></blockquote></blockquote><br><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: medium; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
">Dear Ned,<br></blockquote><br><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: medium; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
">Improving the efficiency of email acceptance might be this incentive. =
&nbsp;As<br>IPv6 becomes pervasive, an authenticated domain source as a =
basis is likely to<br>be more sustainable over time. &nbsp;Establishing =
expectations that StartTLS<br>confirms both server and client =
certificates affords improved transactional<br>protection from spoofing =
or reputation poisoning, especially with the<br>transparency and economy =
afforded by DANE for protection from simple<br>monitoring, malicious =
spoofing, and reputation poisoning. &nbsp;Providers will need<br>to be =
trustworthy and may need to reside in specific geopolitical =
regions<br>willing to ensure such protections.<br></blockquote><br>I =
must be missing something here, because I don't see how what we've =
been<br>discussing - preventing pervasive surveilance in general and =
mandating<br>SSL/TLS on more connections in particular - has anything to =
do with email<br>acceptance.<br></blockquote><div><br></div><span =
style=3D"font-family: CMR9; ">This is achieved by StartTLS exchanging =
BOTH client and server certificates. &nbsp;While indeed security =
concerns are normally related with destinations of account access over =
web, IMAP, and POP where the client is authenticated using other means, =
it is important </span><span style=3D"font-family: CMR9; ">not to =
overlook the lack of privacy protection afforded plaintext exchanges =
over SMTP. &nbsp;</span>Internet exchange in plaintext is exposed to =
undetectable surveillance not requiring any provider cooperation. =
&nbsp;Deprecating use of plaintext exchange for what should be =
considered "private" user-to-user communications would <span =
style=3D"font-family: CMR9; ">force governments and providers to use =
expressed policies. &nbsp;A</span>ny plaintext exchange should be =
considered "public" especially when warrantless wiretapping has become =
the norm since 2007&nbsp;with legal clarifications suggesting =
"information gathering" is not "electronic surveillance". &nbsp;This can =
lead to&nbsp;Orwellian concerns of "self censorship" through various =
forms of suppression and ostracism.<div><font face=3D"CMR9" =
size=3D"3"><br></font></div><div><font face=3D"CMR9" size=3D"3">Private =
exchanges should be able to use encryption as the prevalent mode for all =
exchanges. &nbsp;With SMTP, encrypted exchanges&nbsp;</font><font =
face=3D"CMR9">immediately</font><font face=3D"CMR9" =
size=3D"3">&nbsp;confront a lack of source authentication necessary to =
defend the service from pervasive abuse. &nbsp;</font><font =
face=3D"CMR9">With IPv4, a lack of source authentication is supplanted =
by reliance on the IP address as a basis for acceptance. &nbsp;This =
practice has many drawbacks such as preventing the effective use of IPv6 =
that could be remedied by validating the client certificate used in what =
would have been a plaintext port 25 exchange and its related loss of =
privacy.</font></div><div><br></div><blockquote type=3D"cite"><blockquote =
type=3D"cite" style=3D"font-family: Helvetica; font-size: medium; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: 2; text-align: =
-webkit-auto; text-indent: 0px; text-transform: none; white-space: =
normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px; ">Multiple keying of encrypted data =
where each key subset resides in different<br>geopolitical regions might =
be a way to increase trust, but this is not<br>off-the-shelf crypto =
which you state as a requirement.<br></blockquote><br>The security of =
IMAP and similar mailbox manipulation protocols seems&nbsp;<br>entirely =
divorced from what you're talking =
about.<br></blockquote><div><br></div><div>Almost. &nbsp;There are some =
delivery schemes that do not depend upon privacy protections afforded by =
the infrastructure. &nbsp;For example, Trend acquired an identify based =
keying product developed by the University of Bristol back in 2002. =
&nbsp;Here is a white paper created by the Enterprise Strategy =
Group.</div><div><a =
href=3D"http://www.trendmicro.com/cloud-content/us/pdfs/business/white-pap=
ers/wp_true-costs-of-email-encryption_analyst-esg.pdf">http://www.trendmic=
ro.com/cloud-content/us/pdfs/business/white-papers/wp_true-costs-of-email-=
encryption_analyst-esg.pdf</a></div><div><br></div><div>It uses Identity =
Base Encryption (IBE) a derivative of PKI, but with simple identity =
attributes. &nbsp;Rather than depending on CAs, Central Trust Authority =
(CTA) is used instead. &nbsp;Because destination addresses decode the =
symmetric key, only that portion of the message is uniquely encrypted. =
&nbsp;This allows one image to be sent to several destinations where =
only those intended to see the message are able to decrypt. &nbsp;This =
approach allows enterprises a means to inspect for data leaks to comply =
with governmental requirements not practical with S/MIME or OpenPGP =
unless key management and encryption has been centralized. &nbsp;As =
such, this means a portion of the message path could be exposed. =
&nbsp;After speaking with the developer of this technology, one of the =
features envisioned from this approach was to require the use of =
multiple CTAs each located in different geo-political regions to prevent =
any unilateral governmental action defeating message =
privacy.</div><div><br></div><div>If there is any interest in this =
technology, perhaps I could then request my management share its terms =
and conditions and more of the underlying =
details.</div><div><br></div><div>Regards,</div><div>Douglas =
Otis</div><div><br></div><div><br></div><div><br><br></div></div></body></=
html>=

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From fluffy@iii.ca  Sun Oct 20 15:57:05 2013
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From: Cullen Jennings <fluffy@iii.ca>
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Subject: [perpass] Few things the IETF might standardize for secure collaboration
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I've been thinking about how to build cloud collaborations systems where =
the data is encrypted and the cloud does not have the keys. Very =
interested in hearing others thoughts on how to do this.=20

Near the end is a list of things that it would be helpful if the IETF =
standardized.=20

http://www.ietf.org/id/draft-jennings-perpass-secure-rai-cloud-00.pdf

Cullen


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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Stephen wrote:

> I think the path forward is more like making opportunistic
> security mechanisms (in particular confidentiality) more-than-MTI
> in a way that builds in some security (against passive attacks)
> as an inherent feature of new protocols, but also results in
> a far easier transition from there to fully authenticated,
> compared to the massive gap between cleartext and fully
> authenticated.

Teasing out OE from other potential tasks is a good thing; of that I'm
convinced.  Whether it's more than MTI *or even MTI* depends on what
recommendations can be made regarding how to do it.  A draft there would
be most welcome (I've heard that some are thinking about doing something
with OTR).

Eliot

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Subject: Re: [perpass] mandatory-to-implement vs. more?
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Cc: perpass <perpass@ietf.org>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Yes, and this begs a question about which encryption we're talking
about, as well.  While most of us see the world as AES, others see it as
GOST and yet others may have other algorithms they are required to use. 
Plain text may be the least common denominator in some cases, for
interoperability.  That doesn't mean we have to code to that case, but
we should at least recognize that if we don't there may be some sites
that become inaccessible to some class of users.

Eliot

On 10/21/13 12:14 PM, Tony Rutkowski wrote:
> Hi Eliot,
>
> Apropos to your suggestion...
>
> What about MTnI (mandatory to not implement) or MTB (mandatory to break)? Public networks and services have been subject to governmental controls on encryption by every country in international law since 1850. Individuals and small groups may be able to skirt the requirements, but not commercial or institutional providers. Seems like a bit of a scaling challenge?
>
> --tony
>
> Eliot Lear <lear@cisco.com> wrote:
>
>> Stephen wrote:
>>
>>> I think the path forward is more like making opportunistic
>>> security mechanisms (in particular confidentiality) more-than-MTI
>>> in a way that builds in some security (against passive attacks)
>>> as an inherent feature of new protocols, but also results in
>>> a far easier transition from there to fully authenticated,
>>> compared to the massive gap between cleartext and fully
>>> authenticated.
>> Teasing out OE from other potential tasks is a good thing; of that I'm
>> convinced.  Whether it's more than MTI *or even MTI* depends on what
>> recommendations can be made regarding how to do it.  A draft there would
>> be most welcome (I've heard that some are thinking about doing something
>> with OTR).
>>
>> Eliot
>> _______________________________________________
>> perpass mailing list
>> perpass@ietf.org
>> https://www.ietf.org/mailman/listinfo/perpass


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Subject: Re: [perpass] Few things the IETF might standardize for secure collaboration
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On Oct 21, 2013, at 5:11 AM, Dan York <york@isoc.org> wrote:
> Good document. In a quick read I naturally have to react to slide 23
> (Trusting DNS) and also slide 11 (Certificate Authority).  On slide =
23,
> you say "Sorry, can't trust this yet.", but what happens as we get =
more
> DNSSEC deployed?  We're already seeing increased validation within =
caching
> resolvers and some measurements are showing around 8% of all DNS =
queries
> coming from resolvers that perform validation.  We're seeing steady =
growth
> in the number of DNSSEC-signed domains.  I know there are those who =
are
> skeptical about DNSSEC deployment, but I'm definitely seeing real
> growth... and see a number of trends pointing to that only continuing.

DNSSEC has two huge issues and one huge potential (untapped) advantage.

Issue #1:  Validation at the wrong place.  Recursive resolver validation =
is of only small (but non-zero) utility: It allows countering =
packet-injection (NSA and their foreign competitors), which can =
otherwise be used to promote a man-on-the-side to a full =
man-in-the-middle.  But the recursive resolver itself is proven =
untrustworthy, so its not the point which should conduct validation.

And if clients are to validate in a mandatory way, they need to be able =
to get DNSSEC over an alternate means, as many clients can't get DNSSEC =
over the wire on UDP 53, many others can't get DNSSEC from the recursive =
resolver, and the combination (can't get either from the wire OR =
recursive resolver) is high enough that its in the "break 1%" category, =
which is generally regarded as unacceptable.


Issue #2:  The big threat against DNS, and the big reason you can't =
trust it, is that the major high-profile attacks have been attacks on =
the registrar.  DNSSEC does no good, because if you can social engineer =
the registrar, you can also get new DS records accepted.



Untapped advantage:  Multiple paths of trust.  If, say, TLS was modified =
to have multiple hostnames, eg
https://www.example.com/www.example.ru/

where the resulting certificate is fetched through DNSSEC, and BOTH =
domains must agree, in order for the connection to proceed.  This =
provides a very unique property: it requires that all paths-of-trust be =
compromised by the same cooperating entity.  That is

. -> .com -> example.com
. -> .ru -> example.ru

both must be compromised by the same entity. =20

"I don't trust .com, I don't trust .ru, but I trust they won't collude =
against me" is a very interesting property that is unique to protocols =
built on top of DNSSEC-as-a-CA.


--
Nicholas Weaver                  it is a tale, told by an idiot,
nweaver@icsi.berkeley.edu                full of sound and fury,
510-666-2903                                 .signifying nothing
PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub.asc


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From ted.ietf@gmail.com  Mon Oct 21 07:08:27 2013
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From: Ted Hardie <ted.ietf@gmail.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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On Sun, Oct 20, 2013 at 1:59 PM, Stephen Farrell
<stephen.farrell@cs.tcd.ie>wrote:

>
> Hi Ted,
>
> Thanks for the draft. As you might guess from earlier discussion
> on here, I think the more-than-MTI approach espoused is maybe the
> right one, if we can figure out how to state the requirement well.
> Have you any ideas on that, or on how we could get towards a
> situation where that gained consensus?
>
>
I think the issue here is that "mandatory to implement" is theoretically
something testable by the IETF's process; mandatory to use is a condition
of the overall system and far less liable to the same testing.  "Default
on" might be testable.

I think, though, to get anywhere we'll need a combination of insistence at
the protocol stage, user education about the meaning of confidentiality and
data integrity, and plain old marketing.  When a user can evaluate a
statement like "safer messaging alternative" and the company providing it
can profit from that evaluation, we'll get traction.



> I've a similar question wrt how to "consider more carefully and
> more consistently the effects of information leakage by DNS and
> other infrastructure" - any ideas how an effort in that direction
> could usefully be structured?
>
>
Well, I think some of the other comments have explored this.  If you are
putting up a web site for blogs, providing a URL like
blogname.blogsite.example leaks data that blogsite.example/blogname does
not; providing both (for vanity or safety, but not both) is a better design
than forcing the leak.  A document that described the issues here may be
quite useful, though I suspect it needs a lot more marketing than the usual
RFC.     On a slightly more protocol-oriented note, David Conrad pointed
out years ago that once DNS data is secured by DNSSEC, you could deliver it
over confidential channels.  If the validation is done at the end user's
system (or within the application there), downloading the data from
anywhere you trust should work.

regards,

Ted




> Ta,
> S.
>
> On 10/20/2013 02:21 AM, Ted Hardie wrote:
> > Like most folks involved in this list, I have a personal response to the
> > current situation and some thoughts on how it will impact my or our work
> in
> > the future.  Since I expect we will pretty short of mic time in Vancouver
> > for thoughts like these, I decided to write them out.
> >
> > http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00
> >
> > is the result.  It's quite short but a quick summary is this:
> >
> > Pervasive monitoring induces self-censoring which harms the Internet and
> > its users.  At the scale of the modern Internet, that means it harms
> > humanity.
> >
> > We can and should change our approach to Internet engineering and system
> > design to deal with this.  There will be costs for that, but we should
> pay
> > them.
> >
> > It helps me, personally, to focus on a single user when asking whether a
> > system or protocol is appropriate in the current environment.  The draft
> > lays out why.
> >
> > regards,
> >
> > Ted Hardie
> >
> >
> >
> > _______________________________________________
> > perpass mailing list
> > perpass@ietf.org
> > https://www.ietf.org/mailman/listinfo/perpass
> >
>

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<div dir=3D"ltr">On Sun, Oct 20, 2013 at 1:59 PM, Stephen Farrell <span dir=
=3D"ltr">&lt;<a href=3D"mailto:stephen.farrell@cs.tcd.ie" target=3D"_blank"=
>stephen.farrell@cs.tcd.ie</a>&gt;</span> wrote:<br><div class=3D"gmail_ext=
ra"><div class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><br>
Hi Ted,<br>
<br>
Thanks for the draft. As you might guess from earlier discussion<br>
on here, I think the more-than-MTI approach espoused is maybe the<br>
right one, if we can figure out how to state the requirement well.<br>
Have you any ideas on that, or on how we could get towards a<br>
situation where that gained consensus?<br>
<br></blockquote><div><br></div><div>I think the issue here is that &quot;m=
andatory to implement&quot; is theoretically something testable by the IETF=
&#39;s process; mandatory to use is a condition of the overall system and f=
ar less liable to the same testing.=A0 &quot;Default on&quot; might be test=
able.<br>
<br></div><div>I think, though, to get anywhere we&#39;ll need a combinatio=
n of insistence at the protocol stage, user education about the meaning of =
confidentiality and data integrity, and plain old marketing.=A0 When a user=
 can evaluate a statement like &quot;safer messaging alternative&quot; and =
the company providing it can profit from that evaluation, we&#39;ll get tra=
ction.<br>
</div><div><br>=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I&#39;ve a similar question wrt how to &quot;consider more carefully and<br=
>
more consistently the effects of information leakage by DNS and<br>
other infrastructure&quot; - any ideas how an effort in that direction<br>
could usefully be structured?<br>
<br></blockquote><div><br></div><div>Well, I think some of the other commen=
ts have explored this.=A0 If you are putting up a web site for blogs, provi=
ding a URL like blogname.blogsite.example leaks data that blogsite.example/=
blogname does not; providing both (for vanity or safety, but not both) is a=
 better design than forcing the leak.=A0 A document that described the issu=
es here may be quite useful, though I suspect it needs a lot more marketing=
 than the usual RFC.=A0=A0=A0=A0 On a slightly more protocol-oriented note,=
 David Conrad pointed out years ago that once DNS data is secured by DNSSEC=
, you could deliver it over confidential channels.=A0 If the validation is =
done at the end user&#39;s system (or within the application there), downlo=
ading the data from anywhere you trust should work.=A0 <br>
<br>regards,<br><br>Ted<br></div><div><br><br>=A0</div><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding=
-left:1ex">
Ta,<br>
S.<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
On 10/20/2013 02:21 AM, Ted Hardie wrote:<br>
&gt; Like most folks involved in this list, I have a personal response to t=
he<br>
&gt; current situation and some thoughts on how it will impact my or our wo=
rk in<br>
&gt; the future. =A0Since I expect we will pretty short of mic time in Vanc=
ouver<br>
&gt; for thoughts like these, I decided to write them out.<br>
&gt;<br>
&gt; <a href=3D"http://tools.ietf.org/html/draft-hardie-perpass-touchstone-=
00" target=3D"_blank">http://tools.ietf.org/html/draft-hardie-perpass-touch=
stone-00</a><br>
&gt;<br>
&gt; is the result. =A0It&#39;s quite short but a quick summary is this:<br=
>
&gt;<br>
&gt; Pervasive monitoring induces self-censoring which harms the Internet a=
nd<br>
&gt; its users. =A0At the scale of the modern Internet, that means it harms=
<br>
&gt; humanity.<br>
&gt;<br>
&gt; We can and should change our approach to Internet engineering and syst=
em<br>
&gt; design to deal with this. =A0There will be costs for that, but we shou=
ld pay<br>
&gt; them.<br>
&gt;<br>
&gt; It helps me, personally, to focus on a single user when asking whether=
 a<br>
&gt; system or protocol is appropriate in the current environment. =A0The d=
raft<br>
&gt; lays out why.<br>
&gt;<br>
&gt; regards,<br>
&gt;<br>
&gt; Ted Hardie<br>
&gt;<br>
&gt;<br>
&gt;<br>
</div></div><div class=3D"HOEnZb"><div class=3D"h5">&gt; __________________=
_____________________________<br>
&gt; perpass mailing list<br>
&gt; <a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_b=
lank">https://www.ietf.org/mailman/listinfo/perpass</a><br>
&gt;<br>
</div></div></blockquote></div><br></div></div>

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From: Ted Hardie <ted.ietf@gmail.com>
To: Bjoern Hoehrmann <derhoermi@gmx.net>
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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On Sun, Oct 20, 2013 at 2:32 PM, Bjoern Hoehrmann <derhoermi@gmx.net> wrote=
:

>
> I was under the impression that TLS as currently deployed would still
> let an attacker know roughly when and how many bytes are exchanged and
> if the blogs are reasonably static and public that should be enough to
> reconstruct which are being read, especially if you can capture repeat
> visits (the knitting blog might feature small vector graphics with
> knitting patterns, and the custom cars blog might have large photos,
> so if the user downloads a lot, custom cars are much more likely).
>
>
If the pattern of download is consistent and the passive surveillance
system is keyed to look for that pattern, you're right that this is a
risk.  You can mitigate it as a user by downloading from multiple sites at
the blog site--if you're looking at custom cars and support information and
knitting, you're not going to trigger the pattern (or not as easily).  A
site that knows its data may be sensitive can also vary the data to avoid
easy pattern matching; this might get easier with the deployment of HTTP
2.0, since multiple flows are multiplexed over a single TLS connection;
deliver different in-line ads for the same content and you get different
patterns.



> (And in practise there are many more problems, like the blogs might be
> on different hostnames and the DNS lookup gives you away, or they might
> load resources from third-party hosts, so you can tell blogs that have
> some video from a popular video site on them from those that have not,
> simply from the client connecting to the video service after loading up
> whatever blog they are interested in, and so on.)
>

Third party hosts are indeed a problem; it's no help if you avoid
name.blogsite.example in favor of blogsite.example/name if you then point
to a third party whose DNS name leaks.

regards,

Ted


> --
> Bj=F6rn H=F6hrmann =B7 mailto:bjoern@hoehrmann.de =B7 http://bjoern.hoehr=
mann.de
> Am Badedeich 7 =B7 Telefon: +49(0)160/4415681 =B7 http://www.bjoernsworld=
.de
> 25899 Dageb=FCll =B7 PGP Pub. KeyID: 0xA4357E78 =B7 http://www.websitedev=
.de/
>

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<div dir=3D"ltr">On Sun, Oct 20, 2013 at 2:32 PM, Bjoern Hoehrmann <span di=
r=3D"ltr">&lt;<a href=3D"mailto:derhoermi@gmx.net" target=3D"_blank">derhoe=
rmi@gmx.net</a>&gt;</span> wrote:<br><div class=3D"gmail_extra"><div class=
=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im"><br>
I was under the impression that TLS as currently deployed would still<br></=
div>
let an attacker know roughly when and how many bytes are exchanged and<br>
if the blogs are reasonably static and public that should be enough to<br>
reconstruct which are being read, especially if you can capture repeat<br>
visits (the knitting blog might feature small vector graphics with<br>
knitting patterns, and the custom cars blog might have large photos,<br>
so if the user downloads a lot, custom cars are much more likely).<br>
<br></blockquote><div><br></div><div>If the pattern of download is consiste=
nt and the passive surveillance system is keyed to look for that pattern, y=
ou&#39;re right that this is a risk.=A0 You can mitigate it as a user by do=
wnloading from multiple sites at the blog site--if you&#39;re looking at cu=
stom cars and support information and knitting, you&#39;re not going to tri=
gger the pattern (or not as easily).=A0 A site that knows its data may be s=
ensitive can also vary the data to avoid easy pattern matching; this might =
get easier with the deployment of HTTP 2.0, since multiple flows are multip=
lexed over a single TLS connection; deliver different in-line ads for the s=
ame content and you get different patterns.<br>
</div><div><br>=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
(And in practise there are many more problems, like the blogs might be<br>
on different hostnames and the DNS lookup gives you away, or they might<br>
load resources from third-party hosts, so you can tell blogs that have<br>
some video from a popular video site on them from those that have not,<br>
simply from the client connecting to the video service after loading up<br>
whatever blog they are interested in, and so on.)<br></blockquote><div><br>=
</div><div>Third party hosts are indeed a problem; it&#39;s no help if you =
avoid name.blogsite.example in favor of blogsite.example/name if you then p=
oint to a third party whose DNS name leaks.<br>
<br></div><div>regards,<br><br>Ted<br></div><div>=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">
<span class=3D"HOEnZb"><font color=3D"#888888">--<br>
Bj=F6rn H=F6hrmann =B7 mailto:<a href=3D"mailto:bjoern@hoehrmann.de">bjoern=
@hoehrmann.de</a> =B7 <a href=3D"http://bjoern.hoehrmann.de" target=3D"_bla=
nk">http://bjoern.hoehrmann.de</a><br>
Am Badedeich 7 =B7 Telefon: <a href=3D"tel:%2B49%280%29160%2F4415681" value=
=3D"+491604415681">+49(0)160/4415681</a> =B7 <a href=3D"http://www.bjoernsw=
orld.de" target=3D"_blank">http://www.bjoernsworld.de</a><br>
25899 Dageb=FCll =B7 PGP Pub. KeyID: 0xA4357E78 =B7 <a href=3D"http://www.w=
ebsitedev.de/" target=3D"_blank">http://www.websitedev.de/</a><br>
</font></span></blockquote></div><br></div></div>

--047d7b86eae6748b7b04e940ef34--

From stephen.farrell@cs.tcd.ie  Mon Oct 21 08:49:41 2013
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Subject: [perpass] draft agenda for Vancouver session
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Hi,

I've posted a draft agenda [1] as previously outlined.

Comments still welcome - folks are starting to make the
various (small) bits of slideware so agenda-bash comments
this week would be most useful.

Thanks to Paul Wouters and Karen O'Donoghue for volunteering
to scribe. One or two more might be useful - if you're up
for it, just mail Sean and I.

Ta,
S.

[1] https://datatracker.ietf.org/meeting/88/agenda/perpass/

From kent@bbn.com  Mon Oct 21 08:58:46 2013
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Cc: perpass@ietf.org
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Nicholas,
> ...
> Thanks to an ability to spoof packets from a gazillion different locations, as long as they can inject a spoofed packet from ANOTHER link in time, they will still be able to do packet injection.  The attacker's point of injection needs to be closer (latency wise) on the network than the final destination of the packet, but thats usually a pretty easy constraint to meet.
If I understand the attack, it requires wiretapping to determine the TCP 
sequence numbers and window
info to create an acceptable response, then send a packet to effect the 
redirect. When you factor
in the latency constraint, it's not clear that there are "a gazillion 
different locations" for
an active wiretapper to use, relative to a wide range of possible targets.
> ...
> If you are assuming MITM on a packet level rather than just an eavesdropper (man on the side), then it really is a full-active attack is just a matter of willingness to do so, since a full MitM can drop packets as well.
Sorry that I was not clear in my comment. What I was saying is that we 
usually view a full, MITM
capability as representing a active wiretap capability, and that is NOT 
the assumption on which
the attack you noted is based. Thus I was arguing that the full MITM 
capability may be much harder
achieve, vs. a passive capability. Also, given the asymmetric routing 
common for many Internet paths,
it might be hard to be a MITM, or a passive wiretapper, for both 
directions of a session, unless
one is able to be very close to one end of the session.

Your discussion of what it takes to securely configure LAN switches, and 
WLANs does
not convince me that its easy for an adversary to gain access, or, 
conversely, that it's
very hard to manage LANs and WLANs to address the cited vulnerabilities. 
That does not mean
that I assume all LANs will be well-managed in this regard, but it's a 
big jump from
"sloppy LAN management" to "easy to effect a MITM" attack on most 
enterprise LANs.

Over the weekend i checked with a friend who consults on security 
matters to a number of large firms,
principally in the financial services and related industries. He 
confirmed by earlier comments re use
of encryption within enterprise LANs. It is almost non-existent, and the 
IT folks want to keep it
that way. They do not see credible passive wiretapping threats in their 
nets, and they value ease of
monitoring and debugging more that the incremental security offered by 
adding encryption. (They're big
on authentication and integrity, just no confidentiality measures within 
a LAN.)

> Why?  Since its clear that there aren't technical limitations on an eavesdropper becoming a full MitM in most cases, its really is only "does becoming a full MitM benefit me as an attacker vs any increased risk of detection".
You have asserted that it's easy, but I don't agree with a number of 
your arguments, so
I'm not ready to concede that becoming a MiTM is easy in many cases.
> ...
> You need full authentication of all data and communication, so sorry for being unclear.
OK, glad we agree on that point.

The problem many of us see is that it's much easier to perform 
opportunistic encryption,
that does not provide authentication, than to provide authentication 
with encryption.

Steve

From kent@bbn.com  Mon Oct 21 09:13:28 2013
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Content-Type: multipart/alternative; boundary="------------000105080301010007030200"
Subject: Re: [perpass] NSA inspired PKIX limitations?
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PHB,

> There are a bunch of changes to PKIX that were blocked for quite some 
> time. The opposition coming from a cabal of DoD etc. contractors. This 
> opposition has proven ultimately futile since the industry has decided 
> to ignore the specification and set its own standards in two cases.
A cabal? Gee do member have secret handshakes and a secret clubhouse? 
That sounds like fun. Can I join? Oh, you're
saying that I _am_ a member!
> I don't want to get into a discussion of Snowden etc. I will however 
> note that I suspected something of the sort was going on several years 
> ago and that is why I was looking to take the standards process to a 
> forum where such interference could be prevented. The only practical 
> effect of Snowden is that I can now explain the reasons for that 
> decision without sounding like a black helicopter paranoid nut.
The fact that the PKIX WG did not elect to adopt every proposal you made 
is hardly a justification for name calling.
Moving your crusade to the CABF was a good strategy; fewer folks to 
convince and a focus on outcomes independent of
architectural considerations. This is the same group that wanted to give 
CAs 3 years to fix a serious security bug,
before the ICANN SSAC insisted otherwise, if I recall Warren's briefing 
in SAAG.
> 1) Name Constraints MUST be marked critical
>
> And utterly stupid restriction since the semantics of the criticality 
> bit are 'break backwards compatibility'. Use of name constraints 
> provide a significant reduction in the attack surface and would have 
> prevented the Flame attack. However marking a name constraint critical 
> breaks Safari and provides no security benefit in the Web PKI.
>
> Outcome: Industry has decided that the standard is that name 
> constraints MAY be marked non-critical.
It might be worth emhpasizing that the principal reason cited for not 
marking the extension critical, as per X,.509
and RFC 5280, was a single vendor's unwillingness to fix a bug in their 
browser. The CABF members, being browser vendors
as well as third-party CAs, was the prefect venue in which elect to 
given precedence to a vendor's intransigence.
> 2) OCSP reports success for unknown/unissued certificates.
>
> One of the reasons that the DigiNotar incident was so severe is that 
> the OCSP responder reported 'Valid' status for certificates that the 
> CA had not issued. This limit is allegedly a consequence of the DoD's 
> billion dollar PKI being unable to issue OCSP responses except by 
> using CRLs as a source.
>
> One important consequence of this constraint is that it provides a 
> weak form of CA transparency. It is possible to determine whether a CA 
> is consistently defaulting on this requirement or not.
>
>
> Outcome: Industry has mandated OCSP responses report INVALID status if 
> the certificate was not issued.
A number of folks have long wanted OCSP to be a cert status protocol, 
instead of a cert _revocation_ status protocol.
DoD is probably not the only CA that uses CRLs to generate OCSP replies. 
The relevant RFCs have always allowed
this practice, and it's a reasonable one, especially if the OCSP service 
providers is not the CA.

There are a number of ways that the major problems associated with 
DigiNotar breech could have been mitigated, many
of them not requiring any changes to protocols.

The fundamental issue here, for both of the examples cited, is that the 
browser PKI model is a terrible one.
DANE is a much better solution, except for the CAs that might lose 
business as a result.

Steve

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    PHB,<br>
    <br>
    <blockquote
cite="mid:CAMm+LwhRq6S8dO+ihYVfNOe8GYZtSfwW8+CCdWgkaJVQ9kfBCg@mail.gmail.com"
      type="cite">
      <div dir="ltr">There are a bunch of changes to PKIX that were
        blocked for quite some time. The opposition coming from a cabal
        of DoD etc. contractors. This opposition has proven ultimately
        futile since the industry has decided to ignore the
        specification and set its own standards in two cases.</div>
    </blockquote>
    A cabal? Gee do member have secret handshakes and a secret
    clubhouse? That sounds like fun. Can I join? Oh, you're<br>
    saying that I <u>am</u> a member!<br>
    <blockquote
cite="mid:CAMm+LwhRq6S8dO+ihYVfNOe8GYZtSfwW8+CCdWgkaJVQ9kfBCg@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div>
          I don't want to get into a discussion of Snowden etc. I will
          however note that I suspected something of the sort was going
          on several years ago and that is why I was looking to take the
          standards process to a forum where such interference could be
          prevented. The only practical effect of Snowden is that I can
          now explain the reasons for that decision without sounding
          like a black helicopter paranoid nut.</div>
      </div>
    </blockquote>
    The fact that the PKIX WG did not elect to adopt every proposal you
    made is hardly a justification for name calling.<br>
    Moving your crusade to the CABF was a good strategy; fewer folks to
    convince and a focus on outcomes independent of<br>
    architectural considerations. This is the same group that wanted to
    give CAs 3 years to fix a serious security bug, <br>
    before the ICANN SSAC insisted otherwise, if I recall Warren's
    briefing in SAAG.<br>
    <blockquote
cite="mid:CAMm+LwhRq6S8dO+ihYVfNOe8GYZtSfwW8+CCdWgkaJVQ9kfBCg@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div>
          <div>1) Name Constraints MUST be marked critical</div>
          <div><br>
          </div>
          <div>And utterly stupid restriction since the semantics of the
            criticality bit are 'break backwards compatibility'. Use of
            name constraints provide a significant reduction in the
            attack surface and would have prevented the Flame attack.
            However marking a name constraint critical breaks Safari and
            provides no security benefit in the Web PKI.&nbsp;</div>
          <div><br>
          </div>
          <div>Outcome: Industry has decided that the standard is that
            name constraints MAY be marked non-critical.</div>
        </div>
      </div>
    </blockquote>
    It might be worth emhpasizing that the principal reason cited for
    not marking the extension critical, as per X,.509<br>
    and RFC 5280, was a single vendor's unwillingness to fix a bug in
    their browser. The CABF members, being browser vendors<br>
    as well as third-party CAs, was the prefect venue in which elect to
    given precedence to a vendor's intransigence.<br>
    <blockquote
cite="mid:CAMm+LwhRq6S8dO+ihYVfNOe8GYZtSfwW8+CCdWgkaJVQ9kfBCg@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div>
          <div>2) OCSP reports success for unknown/unissued
            certificates.
            <div><br>
            </div>
            <div>One of the reasons that the DigiNotar incident was so
              severe is that the OCSP responder reported 'Valid' status
              for certificates that the CA had not issued. This limit is
              allegedly a consequence of the DoD's billion dollar PKI
              being unable to issue OCSP responses except by using CRLs
              as a source.</div>
            <div><br>
            </div>
            <div>One important consequence of this constraint is that it
              provides a weak form of CA transparency. It is possible to
              determine whether a CA is consistently defaulting on this
              requirement or not.</div>
            <div>
              <br>
            </div>
            <div><br>
            </div>
            <div>Outcome: Industry has mandated OCSP responses report
              INVALID status if the certificate was not issued.</div>
          </div>
        </div>
      </div>
    </blockquote>
    A number of folks have long wanted OCSP to be a cert status
    protocol, instead of a cert <u>revocation</u> status protocol. <br>
    DoD is probably not the only CA that uses CRLs to generate OCSP
    replies. The relevant RFCs have always allowed<br>
    this practice, and it's a reasonable one, especially if the OCSP
    service providers is not the CA. <br>
    <br>
    There are a number of ways that the major problems associated with
    DigiNotar breech could have been mitigated, many<br>
    of them not requiring any changes to protocols. <br>
    <br>
    The fundamental issue here, for both of the examples cited, is that
    the browser PKI model is a terrible one.<br>
    DANE is a much better solution, except for the CAs that might lose
    business as a result. <br>
    <br>
    Steve<br>
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From kathleen.moriarty@emc.com  Mon Oct 21 10:55:49 2013
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From: "Moriarty, Kathleen" <kathleen.moriarty@emc.com>
To: "perpass@ietf.org" <perpass@ietf.org>, "saag@ietf.org" <saag@ietf.org>
Date: Mon, 21 Oct 2013 13:55:11 -0400
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From datapacrat@gmail.com  Mon Oct 21 12:00:50 2013
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From: DataPacRat <datapacrat@gmail.com>
To: perpass@ietf.org
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Subject: [perpass]  Web-of-trust CAs
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I've just posted a new version of a draft for an extension to the
current vCard format, "Signed vCards" [1]. The general idea is to use
existing encryption techniques to turn an existing format for
"identity description" into one for "identity authentication",
including non-email-based identifiers, change of identifiers over
time, publication and revocation of keys, and so forth.

The reason I'm putting all of this together is that, after finding out
just how brittle the current Certificate Authority system is, I wanted
to have a replacement that was much mushier and resistant to root-CA
hijacking, possibly based on some form of web-of-trust. I'm currently
trying to teach myself enough about webfist [2] to see if it can be
adapted for the purpose, likely by replacing its current DKIM-based
authentication system. My thought is that if that can be made to work,
then it may be feasible to try combining Signed vCards with CA-style
certificates.

There's also the possibility that I'm completely deluded about the
whole approach. I'm not an expert in the field; I'm just trying to
find a solution that's within my meager skills. So I'm hoping to evoke
as much feedback and constructive criticism as I can. Since swapping
out hierarchical CAs for a system more resistant to a subpoena attack
would seem to help reduce pervasive monitoring, this list seems a
worthwhile place to discuss it.

So: How can my ideas be improved?



[1] https://datatracker.ietf.org/doc/draft-boese-vcarddav-signedvcard/
[2] http://www.onebigfluke.com/2013/06/bootstrapping-webfinger-with-webfist.html


Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From brian.e.carpenter@gmail.com  Mon Oct 21 12:19:07 2013
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Date: Tue, 22 Oct 2013 08:18:58 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Cc: perpass <perpass@ietf.org>, Eliot Lear <lear@cisco.com>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Tony,

On 21/10/2013 23:14, Tony Rutkowski wrote:
> Hi Eliot,
> 
> Apropos to your suggestion...
> 
> What about MTnI (mandatory to not implement) or MTB (mandatory to break)? Public networks and services have been subject to governmental controls on encryption by every country in international law since 1850. Individuals and small groups may be able to skirt the requirements, but not commercial or institutional providers. Seems like a bit of a scaling challenge?
> 

I believe that is *exactly* why the IETF endorsed both RFC 1984 and
RFC 2804. It's *our* job to make our specs as secure as reasonably
possible and to not help make them liable to eavesdropping. If that
makes signals intelligence agencies unhappy, or presents implementors
with a conflict between an IETF "MUST" and a jurisdictional "MUST NOT",
that isn't our concern.

Here, I believe we should focus only on specifications that enhance
privacy, and IMHO that certainly includes specifying that implementations
must have strong privacy-protecting default configurations.

    Brian

From hallam@gmail.com  Mon Oct 21 12:20:38 2013
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Date: Mon, 21 Oct 2013 15:20:34 -0400
Message-ID: <CAMm+Lwi9SBRpz0kdojiwpzkruSMi3PNZ98wMp_yL4uCT+pZdKw@mail.gmail.com>
From: Phillip Hallam-Baker <hallam@gmail.com>
To: DataPacRat <datapacrat@gmail.com>
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Subject: Re: [perpass] Web-of-trust CAs
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--001a1133aa86a3ca9d04e9452de3
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On Mon, Oct 21, 2013 at 2:58 PM, DataPacRat <datapacrat@gmail.com> wrote:

> I've just posted a new version of a draft for an extension to the
> current vCard format, "Signed vCards" [1]. The general idea is to use
> existing encryption techniques to turn an existing format for
> "identity description" into one for "identity authentication",
> including non-email-based identifiers, change of identifiers over
> time, publication and revocation of keys, and so forth.
>
> The reason I'm putting all of this together is that, after finding out
> just how brittle the current Certificate Authority system is, I wanted
> to have a replacement that was much mushier and resistant to root-CA
> hijacking, possibly based on some form of web-of-trust. I'm currently
> trying to teach myself enough about webfist [2] to see if it can be
> adapted for the purpose, likely by replacing its current DKIM-based
> authentication system. My thought is that if that can be made to work,
> then it may be feasible to try combining Signed vCards with CA-style
> certificates.
>
> There's also the possibility that I'm completely deluded about the
> whole approach. I'm not an expert in the field; I'm just trying to
> find a solution that's within my meager skills. So I'm hoping to evoke
> as much feedback and constructive criticism as I can. Since swapping
> out hierarchical CAs for a system more resistant to a subpoena attack
> would seem to help reduce pervasive monitoring, this list seems a
> worthwhile place to discuss it.
>

I think you need to work out how to evaluate how trust in the Web of Trust
is evaluated:

http://tools.ietf.org/html/draft-hallambaker-prismproof-trust-00

You can accuse the CA system of being 'brittle' but so is Web of Trust once
you get past the keys that you signed directly yourself.


Putting the key in a vcard only addresses one part of the problem, you need
to know whether you have the right vcard. An attacker that can knock over a
CA will have no trouble knocking over a simple vcard scheme either.

To replace that system you have to show that what you propose as a
replacement is actually stronger and that it is not susceptible to
sovereign control by a single government (at minimum, some of us are not
going to be any more happy with a group of governments acting in concert
unless you can assure us that they will not collude).


Where vcard is supported, it makes a fine mechanism for converting a key
identifier to a key. It is a less good mechanism for establishing trust in
a key which is what most of us see as the hard part.

-- 
Website: http://hallambaker.com/

--001a1133aa86a3ca9d04e9452de3
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Mon, Oct 21, 2013 at 2:58 PM, DataPacRat <span dir=3D"ltr">&lt;<=
a href=3D"mailto:datapacrat@gmail.com" target=3D"_blank">datapacrat@gmail.c=
om</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">I&#39;ve just posted a new version of a draft for an exten=
sion to the<br>

current vCard format, &quot;Signed vCards&quot; [1]. The general idea is to=
 use<br>
existing encryption techniques to turn an existing format for<br>
&quot;identity description&quot; into one for &quot;identity authentication=
&quot;,<br>
including non-email-based identifiers, change of identifiers over<br>
time, publication and revocation of keys, and so forth.<br>
<br>
The reason I&#39;m putting all of this together is that, after finding out<=
br>
just how brittle the current Certificate Authority system is, I wanted<br>
to have a replacement that was much mushier and resistant to root-CA<br>
hijacking, possibly based on some form of web-of-trust. I&#39;m currently<b=
r>
trying to teach myself enough about webfist [2] to see if it can be<br>
adapted for the purpose, likely by replacing its current DKIM-based<br>
authentication system. My thought is that if that can be made to work,<br>
then it may be feasible to try combining Signed vCards with CA-style<br>
certificates.<br>
<br>
There&#39;s also the possibility that I&#39;m completely deluded about the<=
br>
whole approach. I&#39;m not an expert in the field; I&#39;m just trying to<=
br>
find a solution that&#39;s within my meager skills. So I&#39;m hoping to ev=
oke<br>
as much feedback and constructive criticism as I can. Since swapping<br>
out hierarchical CAs for a system more resistant to a subpoena attack<br>
would seem to help reduce pervasive monitoring, this list seems a<br>
worthwhile place to discuss it.<br></blockquote><div><br></div><div>I think=
 you need to work out how to evaluate how trust in the Web of Trust is eval=
uated:</div><div><br></div><div><a href=3D"http://tools.ietf.org/html/draft=
-hallambaker-prismproof-trust-00">http://tools.ietf.org/html/draft-hallamba=
ker-prismproof-trust-00</a><br>
</div><div><br></div><div>You can accuse the CA system of being &#39;brittl=
e&#39; but so is Web of Trust once you get past the keys that you signed di=
rectly yourself.</div><div><br></div><div><br></div><div>Putting the key in=
 a vcard only addresses one part of the problem, you need to know whether y=
ou have the right vcard. An attacker that can knock over a CA will have no =
trouble knocking over a simple vcard scheme either.</div>
<div><br></div><div>To replace that system you have to show that what you p=
ropose as a replacement is actually stronger and that it is not susceptible=
 to sovereign control by a single government (at minimum, some of us are no=
t going to be any more happy with a group of governments acting in concert =
unless you can assure us that they will not collude).</div>
<div><br></div><div><br></div><div>Where vcard is supported, it makes a fin=
e mechanism for converting a key identifier to a key. It is a less good mec=
hanism for establishing trust in a key which is what most of us see as the =
hard part.</div>
<div><br></div></div>-- <br>Website: <a href=3D"http://hallambaker.com/">ht=
tp://hallambaker.com/</a><br>
</div></div>

--001a1133aa86a3ca9d04e9452de3--

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Date: Mon, 21 Oct 2013 15:47:09 -0400
Message-ID: <8dy8vrduywxmujacpk0u3rwv.1382384829092@email.android.com>
From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Cc: perpass <perpass@ietf.org>, Eliot Lear <lear@cisco.com>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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On Mon, Oct 21, 2013 at 12:12 PM, Stephen Kent <kent@bbn.com> wrote:

>  PHB,
>
>
>  There are a bunch of changes to PKIX that were blocked for quite some
> time. The opposition coming from a cabal of DoD etc. contractors. This
> opposition has proven ultimately futile since the industry has decided to
> ignore the specification and set its own standards in two cases.
>
> A cabal? Gee do member have secret handshakes and a secret clubhouse? That
> sounds like fun. Can I join? Oh, you'r saying that I *am* a member!
>


One of the issues that has been raised in the government world is how do we
convince people looking in that the IETF spec have not been contaminated by
some of the alleged $250 mil/yr being spent on such purposes.

This is not a theoretical problem or even a new one, but it is one that has
been ignored in the past and is now going to be very much harder to ignore.


Whether we like it or not, this is now part of the distrust landscape we
have to deal with when designing technical solutions. If people want
technologies like DNSSEC/DANE or RPKI to be deployed in practice they are
going to have to answer the difficult questions about how cryptography is
used to concentrate power over the Internet infrastructure by a very narrow
range of institutions, most of which are ultimately under US govt. control.

Now you can dismiss the conspiracy theories as nonsense but these are now
conspiracy theories which are believed by the heads of government in some
very large and significant countries. Countries that have the ability to
decide Internet standards within their borders for themselves if they
choose. So anyone who is proposing to deploy cryptographic infrastructures
who does not take these issues into account is likely wasting their time at
best or may at worse provoke those governments to fracture the Internet
rather than allow entrenchment of existing powers.


If we try to look at the situation from their point of view, what do we see?

On past vulnerabilities, it would seem that the NSA has delivered a paltry
return if very much of that $250mil was spent on subverting standards. At
best they have one borked random number generator that Ferguson spotted was
bjorked back in 2007 and Bruce blogged on, a couple of PKIX holes that they
maybe helped keep open. Thats hardly a return on investment to be proud of.


Another hypothesis is that much of that money was spent for the purposes it
should have been spent on - protecting US cyber infrastructure from attack
i.e. cyberdefense but that the expenditures were written up as cyber attack
because that is what was prized during the Alexander years at the NSA.

So even if we see future documents come out naming names or programs, they
don't necessarily mean what they might say.



-- 
Website: http://hallambaker.com/

--001a11345d84531a1204e9460734
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<div dir=3D"ltr">On Mon, Oct 21, 2013 at 12:12 PM, Stephen Kent <span dir=
=3D"ltr">&lt;<a href=3D"mailto:kent@bbn.com" target=3D"_blank">kent@bbn.com=
</a>&gt;</span> wrote:<br><div class=3D"gmail_extra"><div class=3D"gmail_qu=
ote"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">

 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    PHB,<div class=3D"im"><br>
    <br>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">There are a bunch of changes to PKIX that were
        blocked for quite some time. The opposition coming from a cabal
        of DoD etc. contractors. This opposition has proven ultimately
        futile since the industry has decided to ignore the
        specification and set its own standards in two cases.</div>
    </blockquote></div>
    A cabal? Gee do member have secret handshakes and a secret
    clubhouse? That sounds like fun. Can I join? Oh, you&#39;r=A0saying tha=
t I <u>am</u> a member!</div></blockquote><div><br></div><div><br></div><di=
v>One of the issues that has been raised in the government world is how do =
we convince people looking in that the IETF spec have not been contaminated=
 by some of the alleged $250 mil/yr being spent on such purposes.</div>
<div><br></div><div>This is not a theoretical problem or even a new one, bu=
t it is one that has been ignored in the past and is now going to be very m=
uch harder to ignore.</div><div><br></div><div><br></div><div>Whether we li=
ke it or not, this is now part of the distrust landscape we have to deal wi=
th when designing technical solutions. If people want technologies like DNS=
SEC/DANE or RPKI to be deployed in practice they are going to have to answe=
r the difficult questions about how cryptography is used to concentrate pow=
er over the Internet infrastructure by a very narrow range of institutions,=
 most of which are ultimately under US govt. control.</div>
<div><br></div><div>Now you can dismiss the conspiracy theories as nonsense=
 but these are now conspiracy theories which are believed by the heads of g=
overnment in some very large and significant countries. Countries that have=
 the ability to decide Internet standards within their borders for themselv=
es if they choose. So anyone who is proposing to deploy cryptographic infra=
structures who does not take these issues into account is likely wasting th=
eir time at best or may at worse provoke those governments to fracture the =
Internet rather than allow entrenchment of existing powers.</div>
</div><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra"><br><=
/div>If we try to look at the situation from their point of view, what do w=
e see?</div><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra"=
>On past vulnerabilities, it would seem that the NSA has delivered a paltry=
 return if very much of that $250mil was spent on subverting standards. At =
best they have one borked random number generator that Ferguson spotted was=
 bjorked back in 2007 and Bruce blogged on, a couple of PKIX holes that the=
y maybe helped keep open. Thats hardly a return on investment to be proud o=
f.<br clear=3D"all">
<div><br></div><div><br></div><div>Another hypothesis is that much of that =
money was spent for the purposes it should have been spent on - protecting =
US cyber infrastructure from attack i.e. cyberdefense but that the expendit=
ures were written up as cyber attack because that is what was prized during=
 the Alexander years at the NSA.</div>
<div><br></div><div>So even if we see future documents come out naming name=
s or programs, they don&#39;t necessarily mean what they might say.</div><d=
iv><br></div><div><br></div><div><br></div>-- <br>Website: <a href=3D"http:=
//hallambaker.com/">http://hallambaker.com/</a><br>

</div></div>

--001a11345d84531a1204e9460734--

From datapacrat@gmail.com  Mon Oct 21 13:47:04 2013
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From: DataPacRat <datapacrat@gmail.com>
To: Phillip Hallam-Baker <hallam@gmail.com>
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Subject: Re: [perpass] Web-of-trust CAs
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On Mon, Oct 21, 2013 at 3:20 PM, Phillip Hallam-Baker <hallam@gmail.com> wrote:

> I think you need to work out how to evaluate how trust in the Web of Trust
> is evaluated:
>
> http://tools.ietf.org/html/draft-hallambaker-prismproof-trust-00
>
> You can accuse the CA system of being 'brittle' but so is Web of Trust once
> you get past the keys that you signed directly yourself.
>
> Putting the key in a vcard only addresses one part of the problem, you need
> to know whether you have the right vcard. An attacker that can knock over a
> CA will have no trouble knocking over a simple vcard scheme either.
>
> To replace that system you have to show that what you propose as a
> replacement is actually stronger and that it is not susceptible to sovereign
> control by a single government (at minimum, some of us are not going to be
> any more happy with a group of governments acting in concert unless you can
> assure us that they will not collude).
>
>
> Where vcard is supported, it makes a fine mechanism for converting a key
> identifier to a key. It is a less good mechanism for establishing trust in a
> key which is what most of us see as the hard part.

The reasons you list are the ones behind why I included the
'Confidence' parameter in the Signed vCard spec. In fact, that
parameter is the key to the whole approach.

There is good reason to treat Bayesian analysis as a useful tool for
analyzing iffy data, such as a pool of keys that may include false
ones. Using existing terminology, any given vCard Authority can be
treated as an ad-hoc Certificate Authority. Using one's own
self-signed vCard as a baseline, web-of-trust techniques could then
determine the relative amount of trust to apply to any other Signed
vCard's data. Eg, if I trust my own vCard at a level of 100 decibans,
I trust Alice's card at 30, and Alice trusts Bob's card at 40, it's
easy to determine that Bob's card should be trusted at somewhere under
30 decibans. (Real situations would be much more complicated, such as
with multiple assertion paths; but this is still early days.)

If this approach is, in fact, workable, then once the details can be
hammered out (perhaps with Webfist-style exchanges, perhaps some
entirely different method), I'm hoping that those details can be
hidden from the end-user as well as the certificate negotiations for
https browsing are, for users who just want to get things done. Throw
in a collection of open-source key/vCard signing apps, which use
cellphone cameras and QR codes, and then, as you mention in your
PRISM-Proof trust model, even a thousand attendees at a conference
could potentially perform mutual key endorsements with just about
every other attendee. But that's still pie-in-the-sky - getting the
Signed vCard draft nailed down is the current step. Getting it nailed
down so it can, at least potentially, eventually support the
pie-in-the-sky, is why I've brought it up on this list.

So: What can I do to improve the current Signed vCard draft?



Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From derhoermi@gmx.net  Mon Oct 21 15:23:13 2013
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive monitoring
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* Ted Hardie wrote:
>If the pattern of download is consistent and the passive surveillance
>system is keyed to look for that pattern, you're right that this is a
>risk.  You can mitigate it as a user by downloading from multiple sites at
>the blog site--if you're looking at custom cars and support information and
>knitting, you're not going to trigger the pattern (or not as easily).  A
>site that knows its data may be sensitive can also vary the data to avoid
>easy pattern matching; this might get easier with the deployment of HTTP
>2.0, since multiple flows are multiplexed over a single TLS connection;
>deliver different in-line ads for the same content and you get different
>patterns.

Right, thanks for the confirmation. Is this an area where the IETF can
and should do more? As an example, should the HTTP/2.0 specification
discuss or an accompanying specification discuss protocol options that
could be useful in mitigating such attacks? Perhaps some kind of meta
document that discusses when adding automatically generated noise to
mitigate such attacks becomes abusive and harmful to the network? It
seems to me this would be a next attack point if suddenly "everything"
goes encrypted over the wire, but I am not sure what level of interest
there is in doing anything about it.

(Even with HTTP/1.1 there are many options to add some innocious noise
and randomness, a browser can decide to forget a cached resource and
fetch it again, or decide it is not going to prefetch a resource or do
it later than normally, and with HTTP/2.0 servers can do similar things
with server-push).
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

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Subject: Re: [perpass] Standards in the age of pervasive suspicion Re: NSA inspired PKIX limitations?
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Phill,

On 10/21/13 10:21 PM, Phillip Hallam-Baker wrote:
>
> Whether we like it or not, this is now part of the distrust landscape
> we have to deal with when designing technical solutions.

I agree with this statement.  It reminds me of a famous statement: trust
but verify.  The only method we have to deal with the sort of
interference we've read about are our open and transparent processes
(it's one of the reasons draft-resnick-consensus is very important, by
the way).  Nobody has anything better to offer, nor will they have.
> If people want technologies like DNSSEC/DANE or RPKI to be deployed in
> practice they are going to have to answer the difficult questions
> about how cryptography is used to concentrate power over the Internet
> infrastructure by a very narrow range of institutions, most of which
> are ultimately under US govt. control.

To this we can only say that if the U.S. attempted to exert that
control, it would be widely noticed, and it would quickly lead to changes.

>
> On past vulnerabilities, it would seem that the NSA has delivered a
> paltry return if very much of that $250mil was spent on subverting
> standards. At best they have one borked random number generator that
> Ferguson spotted was bjorked back in 2007 and Bruce blogged on, a
> couple of PKIX holes that they maybe helped keep open. Thats hardly a
> return on investment to be proud of.

Two things:

1.  $250 million probably doesn't account for everything that was done.
2.  I would expect that this was a relatively small portion of what was
spent.
>
>
> Another hypothesis is that much of that money was spent for the
> purposes it should have been spent on - protecting US cyber
> infrastructure from attack i.e. cyberdefense but that the expenditures
> were written up as cyber attack because that is what was prized during
> the Alexander years at the NSA.

Who knows?  Does it matter from an IETF perspective?  Does it change the
attack surface discussion in a formal sense?

Eliot

--------------060909000601020706050902
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

<html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Phill,<br>
    <br>
    <div class="moz-cite-prefix">On 10/21/13 10:21 PM, Phillip
      Hallam-Baker wrote:<br>
    </div>
    <blockquote
cite="mid:CAMm+LwiDGDDOpWGq=2GePUjwE00U_HgFzakdPOgQKGYN3=qGpA@mail.gmail.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <div dir="ltr"><br>
        <div class="gmail_extra">
          <div class="gmail_quote">
            <div>Whether we like it or not, this is now part of the
              distrust landscape we have to deal with when designing
              technical solutions. </div>
          </div>
        </div>
      </div>
    </blockquote>
    <br>
    I agree with this statement.Â  It reminds me of a famous statement:
    trust but verify.Â  The only method we have to deal with the sort of
    interference we've read about are our open and transparent processes
    (it's one of the reasons draft-resnick-consensus is very important,
    by the way).Â  Nobody has anything better to offer, nor will they
    have.<br>
    <blockquote
cite="mid:CAMm+LwiDGDDOpWGq=2GePUjwE00U_HgFzakdPOgQKGYN3=qGpA@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_extra">
          <div class="gmail_quote">
            <div>If people want technologies like DNSSEC/DANE or RPKI to
              be deployed in practice they are going to have to answer
              the difficult questions about how cryptography is used to
              concentrate power over the Internet infrastructure by a
              very narrow range of institutions, most of which are
              ultimately under US govt. control.</div>
          </div>
        </div>
      </div>
    </blockquote>
    <br>
    To this we can only say that if the U.S. attempted to exert that
    control, it would be widely noticed, and it would quickly lead to
    changes.<br>
    <br>
    <blockquote
cite="mid:CAMm+LwiDGDDOpWGq=2GePUjwE00U_HgFzakdPOgQKGYN3=qGpA@mail.gmail.com"
      type="cite">
      <div dir="ltr"><br>
        <div class="gmail_extra">On past vulnerabilities, it would seem
          that the NSA has delivered a paltry return if very much of
          that $250mil was spent on subverting standards. At best they
          have one borked random number generator that Ferguson spotted
          was bjorked back in 2007 and Bruce blogged on, a couple of
          PKIX holes that they maybe helped keep open. Thats hardly a
          return on investment to be proud of.<br clear="all">
        </div>
      </div>
    </blockquote>
    <br>
    Two things:<br>
    <br>
    1.Â  $250 million probably doesn't account for everything that was
    done.<br>
    2.Â  I would expect that this was a relatively small portion of what
    was spent.<br>
    <blockquote
cite="mid:CAMm+LwiDGDDOpWGq=2GePUjwE00U_HgFzakdPOgQKGYN3=qGpA@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_extra">
          <div><br>
          </div>
          <div><br>
          </div>
          <div>Another hypothesis is that much of that money was spent
            for the purposes it should have been spent on - protecting
            US cyber infrastructure from attack i.e. cyberdefense but
            that the expenditures were written up as cyber attack
            because that is what was prized during the Alexander years
            at the NSA.</div>
        </div>
      </div>
    </blockquote>
    <br>
    Who knows?Â  Does it matter from an IETF perspective?Â  Does it change
    the attack surface discussion in a formal sense?<br>
    <br>
    Eliot<br>
  </body>
</html>

--------------060909000601020706050902--

From hannes.tschofenig@gmx.net  Mon Oct 21 23:14:23 2013
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From: Hannes Tschofenig <hannes.tschofenig@gmx.net>
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Subject: Re: [perpass] Standards in the age of pervasive suspicion Re: NSA inspired PKIX limitations?
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Hi Eliot, Hi Phillip,

On 10/22/2013 06:13 AM, Eliot Lear wrote:
>>
>> Whether we like it or not, this is now part of the distrust landscape
>> we have to deal with when designing technical solutions.
>
> I agree with this statement.  It reminds me of a famous statement: trust
> but verify.  The only method we have to deal with the sort of
> interference we've read about are our open and transparent processes
> (it's one of the reasons draft-resnick-consensus is very important, by
> the way).  Nobody has anything better to offer, nor will they have.

In context of the cryptographic primitives we certainly have relied a 
lot on NIST, which is reflected in the number of presentations at the 
SAAG meetings.

We have made too few attempts to reach out to other communities (if 
those even exist) to hear other views. I once talked to Bart Preneel, 
who is involved in the European crypto community, to attend an IETF 
meeting but (for whatever reason) it didn't work out.

Maybe that's something to think about?

>> If people want technologies like DNSSEC/DANE or RPKI to be deployed in
>> practice they are going to have to answer the difficult questions
>> about how cryptography is used to concentrate power over the Internet
>> infrastructure by a very narrow range of institutions, most of which
>> are ultimately under US govt. control.
>
> To this we can only say that if the U.S. attempted to exert that
> control, it would be widely noticed, and it would quickly lead to changes.

Although I wasn't at the IAB at that time I recall that the RPKI 
decision for having a single trust anchor was everything but easy.

Here is the IAB statement from that time:
http://www.ietf.org/mail-archive/web/ietf-announce/current/msg07028.html

Maybe Marcelo, who was at the IAB at that time, can say something about 
the discussions.

Ciao
Hannes


From huitema@huitema.net  Mon Oct 21 23:26:23 2013
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Subject: Re: [perpass] Some personal thoughts on the impact of pervasive	monitoring
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> Thanks for the draft. As you might guess from earlier discussion
> on here, I think the more-than-MTI approach espoused is maybe the
> right one, if we can figure out how to state the requirement well.
> Have you any ideas on that, or on how we could get towards a
> situation where that gained consensus?

Networking standards are promoted by consensus and by network effects. In
the absence of some forcing function, "fallback to clear text" gets promoted
by network effects, because it is de facto forced by the sites that don't
bother deploying the more secure options. The best way to break that is to
provide "air cover" for security, e.g. a text in the protocol description
RFC that says "nodes requiring a modicum of security SHOULD refuse to use
clear text connections."  That would effectively turn the tables.

Suppose for example that a large enough mail service starts to require TLS
for SMTP connections. Many sites who are accustomed to send mail in clear
text will initially protest when their mail gets bounced. But if the
standard says that yes, they have all right to do that, then the big site
has "air cover." "I am not breaking you, I am just following best practice."
At this point, you will see more and more sites opting to turn on TLS, and
pretty soon the network effects will work in favor of encryption.

Of course, to be practical, this requires that sites can easily get a
certificate of some kind, PKI or DANE, to actually use TLS...

-- Christian Huitema



From hannes.tschofenig@gmx.net  Mon Oct 21 23:38:05 2013
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Subject: [perpass] draft-tschofenig-perpass-surveillance-00.txt
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Hi all,

with Bruce Schneiers proposal to dedicate the November IETF meeting to 
the topic of surveillance there was a lot of discussion about what the 
IETF can do in this area.

In preparation of an IAB tech chat and the technical plenary about 
Internet hardening I prepared a short presentation to the IAB.

The presentation contained a summary of some of the discovered attacks 
and tried to explain how they relate to the bigger security picture.

While many of you, as security experts, are aware of the role and the 
limitations of the IETF in security others in the IAB thought it would 
be useful to produce a short writeup.

I produced that write-up and you can find it here:
http://tools.ietf.org/html/draft-tschofenig-perpass-surveillance-00

It might help others to understand what we can do ourselves in standards 
development and where we have to work with communities outside the IETF 
to make a difference.

Ciao
Hannes

From hannes.tschofenig@gmx.net  Mon Oct 21 23:48:28 2013
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Subject: [perpass] draft-tschofenig-iab-webpki-evolution-00
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Hi all,

one item that predates the pervasive surveillance debate is the 
discussion about improving the public key infrastructure (but still has 
relevance in this discussion, see 
https://www.net-security.org/secworld.php?id=15579).

Following the workshop at NIST earlier this year the IAB and ISOC have 
been reaching out to different players (and are still doing that) to 
continue the conversation.

We have put together a first document that describes the different 
proposals (and as you can see the level of detail available for them and 
their maturity varies greately). Here is the writeup:
http://tools.ietf.org/html/draft-tschofenig-iab-webpki-evolution-00

The analysis is still a bit weak and requires more work but the 
proposals are hopefully captured accurately. Let us know whether there 
is something missing.

We hope that this could help to create move momentum behind certain 
proposals to get them accepted by the community and widely deployed.

Ciao
Hannes

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Subject: Re: [perpass] Standards in the age of pervasive suspicion
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Hi Hannes,
At 23:14 21-10-2013, Hannes Tschofenig wrote:
>In context of the cryptographic primitives we certainly have relied 
>a lot on NIST, which is reflected in the number of presentations at 
>the SAAG meetings.
>
>We have made too few attempts to reach out to other communities (if 
>those even exist) to hear other views. I once talked to Bart 
>Preneel, who is involved in the European crypto community, to attend 
>an IETF meeting but (for whatever reason) it didn't work out.
>
>Maybe that's something to think about?

There are several governments which rely on NIST.  It's difficult to 
say whether there will be a shift away from that.

In this age of suspicion a single-source provider is not a good 
idea.  If the IETF decides to review and re-review its protocols it 
would be good to have input from other communities (re. what you 
mentioned above).

Regards,
-sm 


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Subject: Re: [perpass] NSA inspired PKIX limitations?
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On 21 October 2013 17:12, Stephen Kent <kent@bbn.com> wrote:

>
>   1) Name Constraints MUST be marked critical
>
>  And utterly stupid restriction since the semantics of the criticality
> bit are 'break backwards compatibility'. Use of name constraints provide a
> significant reduction in the attack surface and would have prevented the
> Flame attack. However marking a name constraint critical breaks Safari and
> provides no security benefit in the Web PKI.
>
>  Outcome: Industry has decided that the standard is that name constraints
> MAY be marked non-critical.
>
> It might be worth emhpasizing that the principal reason cited for not
> marking the extension critical, as per X,.509
> and RFC 5280, was a single vendor's unwillingness to fix a bug in their
> browser. The CABF members, being browser vendors
> as well as third-party CAs, was the prefect venue in which elect to given
> precedence to a vendor's intransigence.
>
>   Even if that vendor had been willing to fix the bug, you'd still need
name constraints to be non-critical, or they'd break every outdated
browser. Which would mean they could not be used for many years. So clearly
they had to be non-critical, as will future extensions have to be, I'm sure.

So, I don't think the emphasis is worth it.

--20cf307f3128c0b17204e954d369
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<div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On 21 October 2013 17:12, Stephen Kent <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:kent@bbn.com" target=3D"_blank">kent@bbn.com</a>&gt;</span> wrote:<br><=
blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px=
 #ccc solid;padding-left:1ex">
<div class=3D"im"><br>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">
        <div>
          <div>1) Name Constraints MUST be marked critical</div>
          <div><br>
          </div>
          <div>And utterly stupid restriction since the semantics of the
            criticality bit are &#39;break backwards compatibility&#39;. Us=
e of
            name constraints provide a significant reduction in the
            attack surface and would have prevented the Flame attack.
            However marking a name constraint critical breaks Safari and
            provides no security benefit in the Web PKI.=A0</div>
          <div><br>
          </div>
          <div>Outcome: Industry has decided that the standard is that
            name constraints MAY be marked non-critical.</div>
        </div>
      </div>
    </blockquote></div>
    It might be worth emhpasizing that the principal reason cited for
    not marking the extension critical, as per X,.509<br>
    and RFC 5280, was a single vendor&#39;s unwillingness to fix a bug in
    their browser. The CABF members, being browser vendors<br>
    as well as third-party CAs, was the prefect venue in which elect to
    given precedence to a vendor&#39;s intransigence.<div class=3D"im"><br>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">
        <div>
          <div></div></div></div></blockquote></div></blockquote></div>Even=
 if that vendor had been willing to fix the bug, you&#39;d still need name =
constraints to be non-critical, or they&#39;d break every outdated browser.=
 Which would mean they could not be used for many years. So clearly they ha=
d to be non-critical, as will future extensions have to be, I&#39;m sure.</=
div>
<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">So, I don&#=
39;t think the emphasis is worth it.</div><div class=3D"gmail_extra"><br></=
div></div>

--20cf307f3128c0b17204e954d369--

From kent@bbn.com  Tue Oct 22 07:19:48 2013
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Subject: Re: [perpass] Web-of-trust CAs
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DataPacRat,
> ...
> The reasons you list are the ones behind why I included the
> 'Confidence' parameter in the Signed vCard spec. In fact, that
> parameter is the key to the whole approach.
A similar proposal, adding qualitative metrics to the basic web of trust 
model,
was the focus of a PhD thesis about 20 years ago, in France. It was not 
a great
idea; trust is not transitive and adding numbers to the mix doesn't 
change that,
although it can lead to considerable confusion for users.

Steve

From datapacrat@gmail.com  Tue Oct 22 08:06:18 2013
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On Tue, Oct 22, 2013 at 10:19 AM, Stephen Kent <kent@bbn.com> wrote:

>> The reasons you list are the ones behind why I included the
>> 'Confidence' parameter in the Signed vCard spec. In fact, that
>> parameter is the key to the whole approach.
>
> A similar proposal, adding qualitative metrics to the basic web of trust
> model,
> was the focus of a PhD thesis about 20 years ago, in France. It was not a
> great
> idea; trust is not transitive and adding numbers to the mix doesn't change
> that,
> although it can lead to considerable confusion for users.

(I know that this isn't the idea you were trying to convey, but I find
the very fact that the idea I came up with was able to /be/ the topic
for a thesis very cheering. :) )

I am extremely aware that Bayesian numbers are extremely non-intuitive
for many people. Simply by rephrasing a basic Bayesian-style word
problem in different ways, from 15% to 46% of doctors get the right
answer [1]. This is why I spent so many paragraphs describing decibans
and their use in the draft, including a table. It's also why, once the
basics of the system are worked out, I'm hoping to offer the option of
hiding all the fiddly bits in the background for the end-user, as in
present-day https.

The key item I am gathering from your response is 'trust is not
transitive'. If that's the case, then wouldn't that also apply to
chains of 'official' CAs, as well? If all that is so, then is it
possible that ad-hoc / mesh-network / web-of-trust /
(insert-buzzword-here) CAs would fare no worse by that metric than the
current hierarchical CA system?


[1] http://yudkowsky.net/rational/bayes/


Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From paul.hoffman@gmail.com  Tue Oct 22 08:27:01 2013
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Subject: [perpass] Hasty PRISM proofing considered harmful
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--047d7b6dc22401286904e95608c5
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This was posted last night by Viktor Dukhovni on the cryptography mailing
list, but is certainly applicable here. Forwarded with Viktor's permission.

====================

There have been many recent efforts to harden the cryptographic
security of various systems.  I would like to urge anyone considering
taking steps in that direction to exercise due caution.

Multiple recent attempts at improvement backfire in various ways:

   - RedHat has been under pressure for some time to enable EC support
     in their OpenSSL RPM package.

    * They finally relented and added EC support ~1 week ago.  However,
      they quickly decided to play it safe and enable just the Suite-B
      curves: secp256r1, secp384r1 and no others.

    * They neglected to consider that the new libraries now
      happily negotiate EECDH key exchange TLS cipher-suites with
      servers that typically don't know of (or can't act on) the
      client's limitations.

    * At the same time newly hardened SMTP servers at gmx.de
      and other sites have "stronger" security by switching to
      secp521r1.

      # Result: SMTP TLS handshakes break, and more mail goes out in
        the clear!

      # With TLS, no EC is better than crippled EC.

   - GnuTLS sets aggressive client-side EDH prime-size lower bound.

    * Exim encounters interoperability problems and works-around
      the setting by allowing 1024-bit EDH in SMTP clients while
      using 2048-bit EDH in the server (which generally works for
      SMTP).

    * Debian decides to improve security in Exim and raises this
      to 2048-bits, breaking interoperability again.

       # Result:  Since SMTP TLS is generally opportunistic, when
         TLS handshakes break, more mail is transmitted in the clear!

   - Some email administrators disable RC4 (enable only the OpenSSL "HIGH"
     ciphers) in opportunistic TLS.  Many extant Microsoft Exchange servers
     support only RC4-SHA1, RC4-MD5 and 3DES (whose implementation is
     breaks post handshake in data transfer).

       # Result: TLS handshakes fail, and mail is sent in the clear.

   - There's lots of press about CRIME, BEAST, ... and some SMTP
     administrators configure their systems to prefer RC4 and
     avoid CBC ciphersuites.

    # The attacks in question are primarily HTTPS attacks,
    cryptanalysis of RC4 may well be the greater threat to SMTP.

There are I expect similar examples of good intentions, but poor
outcomes outside the world of SMTP.  Raising the bar on Internet
security will take considerable time and effort.  Updated standards
will have to be developed, toolkits extended to support them and
applications updated.  Rolling improved security out to end-users
will likely take on the order of a decade.

In the mean-time, users should make an effort to configure their
systems to employ current best-practice security, trying to go
beyond that into uncharted territory may well be counter-productive.

Endpoint security and misuse of data at rest are still IMHO the
bigger issues.  I am much more concerned about the proliferation
of miniature programmable computers inside our computers (CPUs and
programmable firmware in disk controllers, battery controllers,
BMC controllers, with opaque binary firmware update blobs, and
complex supply chains) that about secp256r1 vs secp521r1.

We thought embedded devices were for physical infrastructure
engineers to worry about, but now they are proliferating inside
our general purpose computers.  The next Stuxnet will run on one
of the invisible computers inside your computer.

With concerted effort we can improve the crypto protocols, but will
it matter if the architecture on top of which the crypto runs has
an ever growing attack surface.

--047d7b6dc22401286904e95608c5
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">This was posted last night by Viktor Dukhovni on the crypt=
ography mailing list, but is certainly applicable here. Forwarded with Vikt=
or&#39;s permission.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<br><br>There have been many recent efforts to harden the cr=
yptographic<br>
security of various systems.=C2=A0 I would like to urge anyone considering<=
br>taking steps in that direction to exercise due caution.<br><br>Multiple =
recent attempts at improvement backfire in various ways:<br><br>=C2=A0=C2=
=A0 - RedHat has been under pressure for some time to enable EC support<br>
=C2=A0=C2=A0=C2=A0=C2=A0 in their OpenSSL RPM package.<br><br>=C2=A0=C2=A0=
=C2=A0 * They finally relented and added EC support ~1 week ago.=C2=A0 Howe=
ver,<br>=C2=A0=C2=A0=C2=A0 =C2=A0 they quickly decided to play it safe and =
enable just the Suite-B<br>=C2=A0=C2=A0=C2=A0 =C2=A0 curves: secp256r1, sec=
p384r1 and no others.<br>
<br>=C2=A0=C2=A0=C2=A0 * They neglected to consider that the new libraries =
now<br>=C2=A0=C2=A0=C2=A0 =C2=A0 happily negotiate EECDH key exchange TLS c=
ipher-suites with<br>=C2=A0=C2=A0=C2=A0 =C2=A0 servers that typically don&#=
39;t know of (or can&#39;t act on) the<br>=C2=A0=C2=A0=C2=A0 =C2=A0 client&=
#39;s limitations.<br>
<br>=C2=A0=C2=A0=C2=A0 * At the same time newly hardened SMTP servers at <a=
 href=3D"http://gmx.de">gmx.de</a><br>=C2=A0=C2=A0=C2=A0 =C2=A0 and other s=
ites have &quot;stronger&quot; security by switching to<br>=C2=A0=C2=A0=C2=
=A0 =C2=A0 secp521r1.<br><br>=C2=A0=C2=A0=C2=A0 =C2=A0 # Result: SMTP TLS h=
andshakes break, and more mail goes out in<br>
=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 the clear!<br><br>=C2=A0=C2=A0=C2=A0 =
=C2=A0 # With TLS, no EC is better than crippled EC.<br><br>=C2=A0=C2=A0 - =
GnuTLS sets aggressive client-side EDH prime-size lower bound. <br><br>=C2=
=A0=C2=A0=C2=A0 * Exim encounters interoperability problems and works-aroun=
d<br>
=C2=A0=C2=A0=C2=A0 =C2=A0 the setting by allowing 1024-bit EDH in SMTP clie=
nts while<br>=C2=A0=C2=A0=C2=A0 =C2=A0 using 2048-bit EDH in the server (wh=
ich generally works for<br>=C2=A0=C2=A0=C2=A0 =C2=A0 SMTP).<br><br>=C2=A0=
=C2=A0=C2=A0 * Debian decides to improve security in Exim and raises this<b=
r>
=C2=A0=C2=A0=C2=A0 =C2=A0 to 2048-bits, breaking interoperability again.<br=
><br>=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0 # Result:=C2=A0 Since SMTP TLS is gene=
rally opportunistic, when<br>=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 TL=
S handshakes break, more mail is transmitted in the clear!<br><br>=C2=A0=C2=
=A0 - Some email administrators disable RC4 (enable only the OpenSSL &quot;=
HIGH&quot;<br>
=C2=A0=C2=A0=C2=A0=C2=A0 ciphers) in opportunistic TLS.=C2=A0 Many extant M=
icrosoft Exchange servers<br>=C2=A0=C2=A0=C2=A0=C2=A0 support only RC4-SHA1=
, RC4-MD5 and 3DES (whose implementation is<br>=C2=A0=C2=A0=C2=A0=C2=A0 bre=
aks post handshake in data transfer).<br><br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 # Result: TLS handshakes fail, and mail is sent in the clear.<br>
<br>=C2=A0=C2=A0 - There&#39;s lots of press about CRIME, BEAST, ... and so=
me SMTP<br>=C2=A0=C2=A0=C2=A0=C2=A0 administrators configure their systems =
to prefer RC4 and<br>=C2=A0=C2=A0=C2=A0=C2=A0 avoid CBC ciphersuites.<br><b=
r>=C2=A0=C2=A0=C2=A0 # The attacks in question are primarily HTTPS attacks,=
<br>
=C2=A0=C2=A0=C2=A0 cryptanalysis of RC4 may well be the greater threat to S=
MTP.<br><br>There are I expect similar examples of good intentions, but poo=
r<br>outcomes outside the world of SMTP.=C2=A0 Raising the bar on Internet<=
br>security will take considerable time and effort.=C2=A0 Updated standards=
<br>
will have to be developed, toolkits extended to support them and<br>applica=
tions updated.=C2=A0 Rolling improved security out to end-users<br>will lik=
ely take on the order of a decade.<br><br>In the mean-time, users should ma=
ke an effort to configure their<br>
systems to employ current best-practice security, trying to go<br>beyond th=
at into uncharted territory may well be counter-productive.<br><br>Endpoint=
 security and misuse of data at rest are still IMHO the<br>bigger issues.=
=C2=A0 I am much more concerned about the proliferation<br>
of miniature programmable computers inside our computers (CPUs and<br>progr=
ammable firmware in disk controllers, battery controllers,<br>BMC controlle=
rs, with opaque binary firmware update blobs, and<br>complex supply chains)=
 that about secp256r1 vs secp521r1.<br>
<br>We thought embedded devices were for physical infrastructure<br>enginee=
rs to worry about, but now they are proliferating inside<br>our general pur=
pose computers.=C2=A0 The next Stuxnet will run on one<br>of the invisible =
computers inside your computer.<br>
<br>With concerted effort we can improve the crypto protocols, but will<br>=
it matter if the architecture on top of which the crypto runs has<br>an eve=
r growing attack surface.<br><br></div>

--047d7b6dc22401286904e95608c5--

From datapacrat@gmail.com  Tue Oct 22 08:55:18 2013
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From: DataPacRat <datapacrat@gmail.com>
To: Phillip Hallam-Baker <hallam@gmail.com>
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] Web-of-trust CAs
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On Mon, Oct 21, 2013 at 4:46 PM, DataPacRat <datapacrat@gmail.com> wrote:

> Eg, if I trust my own vCard at a level of 100 decibans,
> I trust Alice's card at 30, and Alice trusts Bob's card at 40, it's
> easy to determine that Bob's card should be trusted at somewhere under
> 30 decibans. (Real situations would be much more complicated, such as
> with multiple assertion paths; but this is still early days.)

I've just realized that not only might this problem be easier to solve
than I expected, it might already be solved. After waking from an
unusual dream, I've realized that it may be possible to analyze trust
networks with the same tools used to measure electrical networks;
specifically, by treating the user as a voltage source, any individual
as a node, and their level of trust in another individual/node as
conductivity (the inverse of resistance). There are plenty of existing
tools to perform analysis of bizarre electrical architectures, so if
this model has any validity, it should be reasonably trivial to apply
them to trust architectures, to work out how much current/trust
emanating from the source/user arrives at any given node/individual.

The question is whether this model /has/ any validity. I'm going to do
all the reading I can think of on trust modeling, but would also
appreciate any useful references anyone reading this might be able to
offer. (I have a limited budget, so free-to-read references are
preferred to paywalled ones.)


Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From stephen.farrell@cs.tcd.ie  Tue Oct 22 09:47:20 2013
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Subject: Re: [perpass] Hasty PRISM proofing considered harmful
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Yep, that's a useful post - we shouldn't rush too much,
but we do want to get things done so that developers
and deployers have something to use.

I wonder what's the best way to proceed with this kind
of stuff. I guess we want a BCP of some sort, but the
question is how to handle the various different cases
of foo-with-tls.

- Yaron did a generic TLS BCP draft. [1]
- PSA did an XMPP TLS BCP draft [2]
- This sounds like we might want an SMTP TLS BCP draft
  or perhaps to add text to [3], but that's aiming for
  experimental and is just about using DANE.

So at present we're heading towards a bunch of foo-with-tls
BCPs. Could those usefully be merged or are they better
kept separate?

Thoughts?

S.

[1] https://tools.ietf.org/html/draft-sheffer-tls-bcp
[2] https://tools.ietf.org/html/draft-saintandre-xmpp-tls
[3] https://tools.ietf.org/html/draft-ietf-dane-smtp-with-dane

On 10/22/2013 04:26 PM, Paul Hoffman wrote:
> This was posted last night by Viktor Dukhovni on the cryptography mailing
> list, but is certainly applicable here. Forwarded with Viktor's permission.
> 
> ====================
> 
> There have been many recent efforts to harden the cryptographic
> security of various systems.  I would like to urge anyone considering
> taking steps in that direction to exercise due caution.
> 
> Multiple recent attempts at improvement backfire in various ways:
> 
>    - RedHat has been under pressure for some time to enable EC support
>      in their OpenSSL RPM package.
> 
>     * They finally relented and added EC support ~1 week ago.  However,
>       they quickly decided to play it safe and enable just the Suite-B
>       curves: secp256r1, secp384r1 and no others.
> 
>     * They neglected to consider that the new libraries now
>       happily negotiate EECDH key exchange TLS cipher-suites with
>       servers that typically don't know of (or can't act on) the
>       client's limitations.
> 
>     * At the same time newly hardened SMTP servers at gmx.de
>       and other sites have "stronger" security by switching to
>       secp521r1.
> 
>       # Result: SMTP TLS handshakes break, and more mail goes out in
>         the clear!
> 
>       # With TLS, no EC is better than crippled EC.
> 
>    - GnuTLS sets aggressive client-side EDH prime-size lower bound.
> 
>     * Exim encounters interoperability problems and works-around
>       the setting by allowing 1024-bit EDH in SMTP clients while
>       using 2048-bit EDH in the server (which generally works for
>       SMTP).
> 
>     * Debian decides to improve security in Exim and raises this
>       to 2048-bits, breaking interoperability again.
> 
>        # Result:  Since SMTP TLS is generally opportunistic, when
>          TLS handshakes break, more mail is transmitted in the clear!
> 
>    - Some email administrators disable RC4 (enable only the OpenSSL "HIGH"
>      ciphers) in opportunistic TLS.  Many extant Microsoft Exchange servers
>      support only RC4-SHA1, RC4-MD5 and 3DES (whose implementation is
>      breaks post handshake in data transfer).
> 
>        # Result: TLS handshakes fail, and mail is sent in the clear.
> 
>    - There's lots of press about CRIME, BEAST, ... and some SMTP
>      administrators configure their systems to prefer RC4 and
>      avoid CBC ciphersuites.
> 
>     # The attacks in question are primarily HTTPS attacks,
>     cryptanalysis of RC4 may well be the greater threat to SMTP.
> 
> There are I expect similar examples of good intentions, but poor
> outcomes outside the world of SMTP.  Raising the bar on Internet
> security will take considerable time and effort.  Updated standards
> will have to be developed, toolkits extended to support them and
> applications updated.  Rolling improved security out to end-users
> will likely take on the order of a decade.
> 
> In the mean-time, users should make an effort to configure their
> systems to employ current best-practice security, trying to go
> beyond that into uncharted territory may well be counter-productive.
> 
> Endpoint security and misuse of data at rest are still IMHO the
> bigger issues.  I am much more concerned about the proliferation
> of miniature programmable computers inside our computers (CPUs and
> programmable firmware in disk controllers, battery controllers,
> BMC controllers, with opaque binary firmware update blobs, and
> complex supply chains) that about secp256r1 vs secp521r1.
> 
> We thought embedded devices were for physical infrastructure
> engineers to worry about, but now they are proliferating inside
> our general purpose computers.  The next Stuxnet will run on one
> of the invisible computers inside your computer.
> 
> With concerted effort we can improve the crypto protocols, but will
> it matter if the architecture on top of which the crypto runs has
> an ever growing attack surface.
> 
> 
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

From hallam@gmail.com  Tue Oct 22 09:55:49 2013
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Subject: Re: [perpass] Web-of-trust CAs
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Trust is not transitive but cost measures are pretty stable

Producing a web of trust with a thousand bogus entries costs essentially nothing

Producing such a web with twenty links to verified parties is much
more expensive

Incidentally, I can't claim any originality for the extended work
factors I use as it happens. Although I came to them independently it
turns out that a co collaborator had gone so far as to organize an
event on the topic,

But what I had not appreciated earlier is just what a difference it
makes to cast the web of trust problem in terms of a work factor
metric and introduce a combination of peer and ttp trust providers.



Sent from my difference engine


> On Oct 22, 2013, at 10:19 AM, Stephen Kent <kent@bbn.com> wrote:
>
> DataPacRat,
>> ...
>> The reasons you list are the ones behind why I included the
>> 'Confidence' parameter in the Signed vCard spec. In fact, that
>> parameter is the key to the whole approach.
> A similar proposal, adding qualitative metrics to the basic web of trust model,
> was the focus of a PhD thesis about 20 years ago, in France. It was not a great
> idea; trust is not transitive and adding numbers to the mix doesn't change that,
> although it can lead to considerable confusion for users.
>
> Steve
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass

From paul.hoffman@gmail.com  Tue Oct 22 11:53:34 2013
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--047d7b2ed341a3cd0804e958ea1c
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I could certainly do a rfc3207bis document, or participate in a
foo-over-tls omnibus. But, as Viktor points out, it's probably going to be
a bit less self-congratulatory than we might have expected.


On Tue, Oct 22, 2013 at 9:46 AM, Stephen Farrell
<stephen.farrell@cs.tcd.ie>wrote:

>
> Yep, that's a useful post - we shouldn't rush too much,
> but we do want to get things done so that developers
> and deployers have something to use.
>
> I wonder what's the best way to proceed with this kind
> of stuff. I guess we want a BCP of some sort, but the
> question is how to handle the various different cases
> of foo-with-tls.
>
> - Yaron did a generic TLS BCP draft. [1]
> - PSA did an XMPP TLS BCP draft [2]
> - This sounds like we might want an SMTP TLS BCP draft
>   or perhaps to add text to [3], but that's aiming for
>   experimental and is just about using DANE.
>
> So at present we're heading towards a bunch of foo-with-tls
> BCPs. Could those usefully be merged or are they better
> kept separate?
>
> Thoughts?
>
> S.
>
> [1] https://tools.ietf.org/html/draft-sheffer-tls-bcp
> [2] https://tools.ietf.org/html/draft-saintandre-xmpp-tls
> [3] https://tools.ietf.org/html/draft-ietf-dane-smtp-with-dane
>
> On 10/22/2013 04:26 PM, Paul Hoffman wrote:
> > This was posted last night by Viktor Dukhovni on the cryptography mailing
> > list, but is certainly applicable here. Forwarded with Viktor's
> permission.
> >
> > ====================
> >
> > There have been many recent efforts to harden the cryptographic
> > security of various systems.  I would like to urge anyone considering
> > taking steps in that direction to exercise due caution.
> >
> > Multiple recent attempts at improvement backfire in various ways:
> >
> >    - RedHat has been under pressure for some time to enable EC support
> >      in their OpenSSL RPM package.
> >
> >     * They finally relented and added EC support ~1 week ago.  However,
> >       they quickly decided to play it safe and enable just the Suite-B
> >       curves: secp256r1, secp384r1 and no others.
> >
> >     * They neglected to consider that the new libraries now
> >       happily negotiate EECDH key exchange TLS cipher-suites with
> >       servers that typically don't know of (or can't act on) the
> >       client's limitations.
> >
> >     * At the same time newly hardened SMTP servers at gmx.de
> >       and other sites have "stronger" security by switching to
> >       secp521r1.
> >
> >       # Result: SMTP TLS handshakes break, and more mail goes out in
> >         the clear!
> >
> >       # With TLS, no EC is better than crippled EC.
> >
> >    - GnuTLS sets aggressive client-side EDH prime-size lower bound.
> >
> >     * Exim encounters interoperability problems and works-around
> >       the setting by allowing 1024-bit EDH in SMTP clients while
> >       using 2048-bit EDH in the server (which generally works for
> >       SMTP).
> >
> >     * Debian decides to improve security in Exim and raises this
> >       to 2048-bits, breaking interoperability again.
> >
> >        # Result:  Since SMTP TLS is generally opportunistic, when
> >          TLS handshakes break, more mail is transmitted in the clear!
> >
> >    - Some email administrators disable RC4 (enable only the OpenSSL
> "HIGH"
> >      ciphers) in opportunistic TLS.  Many extant Microsoft Exchange
> servers
> >      support only RC4-SHA1, RC4-MD5 and 3DES (whose implementation is
> >      breaks post handshake in data transfer).
> >
> >        # Result: TLS handshakes fail, and mail is sent in the clear.
> >
> >    - There's lots of press about CRIME, BEAST, ... and some SMTP
> >      administrators configure their systems to prefer RC4 and
> >      avoid CBC ciphersuites.
> >
> >     # The attacks in question are primarily HTTPS attacks,
> >     cryptanalysis of RC4 may well be the greater threat to SMTP.
> >
> > There are I expect similar examples of good intentions, but poor
> > outcomes outside the world of SMTP.  Raising the bar on Internet
> > security will take considerable time and effort.  Updated standards
> > will have to be developed, toolkits extended to support them and
> > applications updated.  Rolling improved security out to end-users
> > will likely take on the order of a decade.
> >
> > In the mean-time, users should make an effort to configure their
> > systems to employ current best-practice security, trying to go
> > beyond that into uncharted territory may well be counter-productive.
> >
> > Endpoint security and misuse of data at rest are still IMHO the
> > bigger issues.  I am much more concerned about the proliferation
> > of miniature programmable computers inside our computers (CPUs and
> > programmable firmware in disk controllers, battery controllers,
> > BMC controllers, with opaque binary firmware update blobs, and
> > complex supply chains) that about secp256r1 vs secp521r1.
> >
> > We thought embedded devices were for physical infrastructure
> > engineers to worry about, but now they are proliferating inside
> > our general purpose computers.  The next Stuxnet will run on one
> > of the invisible computers inside your computer.
> >
> > With concerted effort we can improve the crypto protocols, but will
> > it matter if the architecture on top of which the crypto runs has
> > an ever growing attack surface.
> >
> >
> >
> > _______________________________________________
> > perpass mailing list
> > perpass@ietf.org
> > https://www.ietf.org/mailman/listinfo/perpass
> >
>

--047d7b2ed341a3cd0804e958ea1c
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">I could certainly do a rfc3207bis document, or participate=
 in a foo-over-tls omnibus. But, as Viktor points out, it&#39;s probably go=
ing to be a bit less self-congratulatory than we might have expected.<br></=
div>
<div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Tue, Oct 2=
2, 2013 at 9:46 AM, Stephen Farrell <span dir=3D"ltr">&lt;<a href=3D"mailto=
:stephen.farrell@cs.tcd.ie" target=3D"_blank">stephen.farrell@cs.tcd.ie</a>=
&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><br>
Yep, that&#39;s a useful post - we shouldn&#39;t rush too much,<br>
but we do want to get things done so that developers<br>
and deployers have something to use.<br>
<br>
I wonder what&#39;s the best way to proceed with this kind<br>
of stuff. I guess we want a BCP of some sort, but the<br>
question is how to handle the various different cases<br>
of foo-with-tls.<br>
<br>
- Yaron did a generic TLS BCP draft. [1]<br>
- PSA did an XMPP TLS BCP draft [2]<br>
- This sounds like we might want an SMTP TLS BCP draft<br>
=C2=A0 or perhaps to add text to [3], but that&#39;s aiming for<br>
=C2=A0 experimental and is just about using DANE.<br>
<br>
So at present we&#39;re heading towards a bunch of foo-with-tls<br>
BCPs. Could those usefully be merged or are they better<br>
kept separate?<br>
<br>
Thoughts?<br>
<br>
S.<br>
<br>
[1] <a href=3D"https://tools.ietf.org/html/draft-sheffer-tls-bcp" target=3D=
"_blank">https://tools.ietf.org/html/draft-sheffer-tls-bcp</a><br>
[2] <a href=3D"https://tools.ietf.org/html/draft-saintandre-xmpp-tls" targe=
t=3D"_blank">https://tools.ietf.org/html/draft-saintandre-xmpp-tls</a><br>
[3] <a href=3D"https://tools.ietf.org/html/draft-ietf-dane-smtp-with-dane" =
target=3D"_blank">https://tools.ietf.org/html/draft-ietf-dane-smtp-with-dan=
e</a><br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
On 10/22/2013 04:26 PM, Paul Hoffman wrote:<br>
&gt; This was posted last night by Viktor Dukhovni on the cryptography mail=
ing<br>
&gt; list, but is certainly applicable here. Forwarded with Viktor&#39;s pe=
rmission.<br>
&gt;<br>
&gt; =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>
&gt;<br>
&gt; There have been many recent efforts to harden the cryptographic<br>
&gt; security of various systems. =C2=A0I would like to urge anyone conside=
ring<br>
&gt; taking steps in that direction to exercise due caution.<br>
&gt;<br>
&gt; Multiple recent attempts at improvement backfire in various ways:<br>
&gt;<br>
&gt; =C2=A0 =C2=A0- RedHat has been under pressure for some time to enable =
EC support<br>
&gt; =C2=A0 =C2=A0 =C2=A0in their OpenSSL RPM package.<br>
&gt;<br>
&gt; =C2=A0 =C2=A0 * They finally relented and added EC support ~1 week ago=
. =C2=A0However,<br>
&gt; =C2=A0 =C2=A0 =C2=A0 they quickly decided to play it safe and enable j=
ust the Suite-B<br>
&gt; =C2=A0 =C2=A0 =C2=A0 curves: secp256r1, secp384r1 and no others.<br>
&gt;<br>
&gt; =C2=A0 =C2=A0 * They neglected to consider that the new libraries now<=
br>
&gt; =C2=A0 =C2=A0 =C2=A0 happily negotiate EECDH key exchange TLS cipher-s=
uites with<br>
&gt; =C2=A0 =C2=A0 =C2=A0 servers that typically don&#39;t know of (or can&=
#39;t act on) the<br>
&gt; =C2=A0 =C2=A0 =C2=A0 client&#39;s limitations.<br>
&gt;<br>
&gt; =C2=A0 =C2=A0 * At the same time newly hardened SMTP servers at <a hre=
f=3D"http://gmx.de" target=3D"_blank">gmx.de</a><br>
&gt; =C2=A0 =C2=A0 =C2=A0 and other sites have &quot;stronger&quot; securit=
y by switching to<br>
&gt; =C2=A0 =C2=A0 =C2=A0 secp521r1.<br>
&gt;<br>
&gt; =C2=A0 =C2=A0 =C2=A0 # Result: SMTP TLS handshakes break, and more mai=
l goes out in<br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0 the clear!<br>
&gt;<br>
&gt; =C2=A0 =C2=A0 =C2=A0 # With TLS, no EC is better than crippled EC.<br>
&gt;<br>
&gt; =C2=A0 =C2=A0- GnuTLS sets aggressive client-side EDH prime-size lower=
 bound.<br>
&gt;<br>
&gt; =C2=A0 =C2=A0 * Exim encounters interoperability problems and works-ar=
ound<br>
&gt; =C2=A0 =C2=A0 =C2=A0 the setting by allowing 1024-bit EDH in SMTP clie=
nts while<br>
&gt; =C2=A0 =C2=A0 =C2=A0 using 2048-bit EDH in the server (which generally=
 works for<br>
&gt; =C2=A0 =C2=A0 =C2=A0 SMTP).<br>
&gt;<br>
&gt; =C2=A0 =C2=A0 * Debian decides to improve security in Exim and raises =
this<br>
&gt; =C2=A0 =C2=A0 =C2=A0 to 2048-bits, breaking interoperability again.<br=
>
&gt;<br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0# Result: =C2=A0Since SMTP TLS is generally=
 opportunistic, when<br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0TLS handshakes break, more mail is t=
ransmitted in the clear!<br>
&gt;<br>
&gt; =C2=A0 =C2=A0- Some email administrators disable RC4 (enable only the =
OpenSSL &quot;HIGH&quot;<br>
&gt; =C2=A0 =C2=A0 =C2=A0ciphers) in opportunistic TLS. =C2=A0Many extant M=
icrosoft Exchange servers<br>
&gt; =C2=A0 =C2=A0 =C2=A0support only RC4-SHA1, RC4-MD5 and 3DES (whose imp=
lementation is<br>
&gt; =C2=A0 =C2=A0 =C2=A0breaks post handshake in data transfer).<br>
&gt;<br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0# Result: TLS handshakes fail, and mail is =
sent in the clear.<br>
&gt;<br>
&gt; =C2=A0 =C2=A0- There&#39;s lots of press about CRIME, BEAST, ... and s=
ome SMTP<br>
&gt; =C2=A0 =C2=A0 =C2=A0administrators configure their systems to prefer R=
C4 and<br>
&gt; =C2=A0 =C2=A0 =C2=A0avoid CBC ciphersuites.<br>
&gt;<br>
&gt; =C2=A0 =C2=A0 # The attacks in question are primarily HTTPS attacks,<b=
r>
&gt; =C2=A0 =C2=A0 cryptanalysis of RC4 may well be the greater threat to S=
MTP.<br>
&gt;<br>
&gt; There are I expect similar examples of good intentions, but poor<br>
&gt; outcomes outside the world of SMTP. =C2=A0Raising the bar on Internet<=
br>
&gt; security will take considerable time and effort. =C2=A0Updated standar=
ds<br>
&gt; will have to be developed, toolkits extended to support them and<br>
&gt; applications updated. =C2=A0Rolling improved security out to end-users=
<br>
&gt; will likely take on the order of a decade.<br>
&gt;<br>
&gt; In the mean-time, users should make an effort to configure their<br>
&gt; systems to employ current best-practice security, trying to go<br>
&gt; beyond that into uncharted territory may well be counter-productive.<b=
r>
&gt;<br>
&gt; Endpoint security and misuse of data at rest are still IMHO the<br>
&gt; bigger issues. =C2=A0I am much more concerned about the proliferation<=
br>
&gt; of miniature programmable computers inside our computers (CPUs and<br>
&gt; programmable firmware in disk controllers, battery controllers,<br>
&gt; BMC controllers, with opaque binary firmware update blobs, and<br>
&gt; complex supply chains) that about secp256r1 vs secp521r1.<br>
&gt;<br>
&gt; We thought embedded devices were for physical infrastructure<br>
&gt; engineers to worry about, but now they are proliferating inside<br>
&gt; our general purpose computers. =C2=A0The next Stuxnet will run on one<=
br>
&gt; of the invisible computers inside your computer.<br>
&gt;<br>
&gt; With concerted effort we can improve the crypto protocols, but will<br=
>
&gt; it matter if the architecture on top of which the crypto runs has<br>
&gt; an ever growing attack surface.<br>
&gt;<br>
&gt;<br>
&gt;<br>
</div></div><div class=3D"HOEnZb"><div class=3D"h5">&gt; __________________=
_____________________________<br>
&gt; perpass mailing list<br>
&gt; <a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_b=
lank">https://www.ietf.org/mailman/listinfo/perpass</a><br>
&gt;<br>
</div></div></blockquote></div><br></div>

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From: Phillip Hallam-Baker <hallam@gmail.com>
To: Hannes Tschofenig <hannes.tschofenig@gmx.net>
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] draft-tschofenig-iab-webpki-evolution-00
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Some comments:

Paragraph1:

It should be noted that in the DigiNotar case the breach was not discovered
for several weeks and not reported after discovery and due to the nature of
the breach revocation was not possible. In the Comodo case the mis-issue
was discovered within minutes and the certificates revoked.

This is a very important point to raise since the next paragraph is
conculsory, "The main problem, however, is
   that any CA can issue a certificate for any domain name."

1) one could make a very good argument that the main problem is that the
browsers don't implement revocation reliably.

2) CAA has already been created to address this problem. If that was the
'main' problem it would be solved. Unfortunately it isn't.


The 'EFF 600' number is unfortunately a XXX and I use the term advisedly.
They have accepted that they are mis-measuring the number of CAs but they
continue to insist on a number they admit they can't support. Please do not
present Fox News figures in what is meant to be a serious report. I regret
that I have to use the word 'XXX' here but when a falsehood is presented
and then insisted on after being proven untrue, what other description is
there?

The EFF study conflates all intermediate certs whose subject name is
different to the issuer with cross certificates to a CA. In practice 300+
of the certificates they identify as 'CA certificates' are issued by a
single CA and none are CA certificates. We have had exhaustive discussion
of the issue and no correction from the EFF unfortunately.

The fact that they can't measure what they would like to measure from the
certificate graph does not mean that they can measure it wrongly in a
fashion that inflates it by a factor of ten and present that figure and
assert that it is up to others to supply a better figure.


The principal problem with Sovereign keys is that it simplifies the trust
management problem by assuming that no network manager will ever make a
mistake. If they make one mistake they will lose control of their domain in
perpetuity. Nobody is ever going to take responsibility for deploying such
a scheme on ebay.com or the like.


I think that you miss the point of CT which is that Transparency is the
principle that the CA can be audited by any party without access to hidden
knowledge. That is a groundbreaking concept in trust infrastructure.

What the client checks is proof that the certificate was entered into the
log, not the log itself. That is an important but subtle point.



On DANE among the risks that have to be considered is that there is only
one provider of PKI services in DANE. Thus if that provider decides to deny
access to a party they have no recourse. Hence the Russian interest in GOST
etc. Whether or not you accept that scenario, the folk who do accept it are
willing to fracture the Internet over it.



On Tue, Oct 22, 2013 at 2:48 AM, Hannes Tschofenig <
hannes.tschofenig@gmx.net> wrote:

> Hi all,
>
> one item that predates the pervasive surveillance debate is the discussion
> about improving the public key infrastructure (but still has relevance in
> this discussion, see https://www.net-security.org/**secworld.php?id=15579<https://www.net-security.org/secworld.php?id=15579>
> ).
>
> Following the workshop at NIST earlier this year the IAB and ISOC have
> been reaching out to different players (and are still doing that) to
> continue the conversation.
>
> We have put together a first document that describes the different
> proposals (and as you can see the level of detail available for them and
> their maturity varies greately). Here is the writeup:
> http://tools.ietf.org/html/**draft-tschofenig-iab-webpki-**evolution-00<http://tools.ietf.org/html/draft-tschofenig-iab-webpki-evolution-00>
>
> The analysis is still a bit weak and requires more work but the proposals
> are hopefully captured accurately. Let us know whether there is something
> missing.
>
> We hope that this could help to create move momentum behind certain
> proposals to get them accepted by the community and widely deployed.
>
> Ciao
> Hannes
> ______________________________**_________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/**listinfo/perpass<https://www.ietf.org/mailman/listinfo/perpass>
>



-- 
Website: http://hallambaker.com/

--089e0160a67653df2d04e9594ce8
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Some comments:<div><br></div><div>Paragraph1:</div><div><b=
r></div><div>It should be noted that in the DigiNotar case the breach was n=
ot discovered for several weeks and not reported after discovery and due to=
 the nature of the breach revocation was not possible. In the Comodo case t=
he mis-issue was discovered within minutes and the certificates revoked.</d=
iv>
<div><br></div><div>This is a very important point to raise since the next =
paragraph is conculsory, &quot;<span style=3D"color:rgb(0,0,0);font-size:1e=
m">The main problem, however,=A0</span><span style=3D"color:rgb(0,0,0);font=
-size:1em">is</span></div>
<div><span style=3D"color:rgb(0,0,0);font-size:1em">=A0 =A0that any CA can =
issue a certificate for any domain name.</span><span style=3D"color:rgb(0,0=
,0);font-size:1em">&quot;=A0</span></div><div><span style=3D"color:rgb(0,0,=
0);font-size:1em"><br>
</span></div><div><span style=3D"color:rgb(0,0,0);font-size:1em">1) one cou=
ld make a very good argument that the main problem is that the browsers don=
&#39;t implement revocation reliably.=A0</span></div><div><span style=3D"co=
lor:rgb(0,0,0);font-size:1em"><br>
</span></div><div><span style=3D"color:rgb(0,0,0);font-size:1em">2) CAA has=
 already been created to address this problem. If that was the &#39;main&#3=
9; problem it would be solved. Unfortunately it isn&#39;t.</span></div><div=
>
<span style=3D"color:rgb(0,0,0);font-size:1em"><br></span></div><div><span =
style=3D"color:rgb(0,0,0);font-size:1em"><br></span></div><div><font color=
=3D"#000000">The &#39;EFF 600&#39; number is=A0unfortunately=A0a XXX and I =
use the term advisedly. They have accepted that they are mis-measuring the =
number of CAs but they continue to insist on a number they admit they can&#=
39;t support. Please do not present Fox News figures in what is meant to be=
 a serious report. I regret that I have to use the word &#39;XXX&#39; here =
but when a falsehood is presented and then insisted on after being proven u=
ntrue, what other description is there?</font></div>
<div><font color=3D"#000000"><br></font></div><div><font color=3D"#000000">=
The EFF study conflates all intermediate certs whose subject name is differ=
ent to the issuer with cross certificates to a CA. In practice 300+ of the =
certificates they identify as &#39;CA certificates&#39; are issued by a sin=
gle CA and none are CA certificates. We have had exhaustive discussion of t=
he issue and no correction from the EFF unfortunately.=A0</font></div>
<div><font color=3D"#000000"><br></font></div><div><font color=3D"#000000">=
The fact that they can&#39;t measure what they would like to measure from t=
he certificate graph does not mean that they can measure it wrongly in a fa=
shion that inflates it by a factor of ten and present that figure and asser=
t that it is up to others to supply a better figure.=A0</font></div>
<div><br></div><div><br></div><div>The principal problem with Sovereign key=
s is that it simplifies the trust management problem by assuming that no ne=
twork manager will ever make a mistake. If they make one mistake they will =
lose control of their domain in perpetuity. Nobody is ever going to take re=
sponsibility for deploying such a scheme on <a href=3D"http://ebay.com">eba=
y.com</a> or the like.</div>
<div><br></div><div><br></div><div>I think that you miss the point of CT wh=
ich is that Transparency is the principle that the CA can be audited by any=
 party without access to hidden knowledge. That is a groundbreaking concept=
 in trust infrastructure.</div>
<div><br></div><div>What the client checks is proof that the certificate wa=
s entered into the log, not the log itself. That is an important but subtle=
 point.</div><div><br></div><div><br></div><div><br></div><div>On DANE amon=
g the risks that have to be considered is that there is only one provider o=
f PKI services in DANE. Thus if that provider decides to deny access to a p=
arty they have no recourse. Hence the Russian interest in GOST etc. Whether=
 or not you accept that scenario, the folk who do accept it are willing to =
fracture the Internet over it.</div>
<div><br></div></div><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Tue, Oct 22, 2013 at 2:48 AM, Hannes Tschofenig <span dir=3D"ltr=
">&lt;<a href=3D"mailto:hannes.tschofenig@gmx.net" target=3D"_blank">hannes=
.tschofenig@gmx.net</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hi all,<br>
<br>
one item that predates the pervasive surveillance debate is the discussion =
about improving the public key infrastructure (but still has relevance in t=
his discussion, see <a href=3D"https://www.net-security.org/secworld.php?id=
=3D15579" target=3D"_blank">https://www.net-security.org/<u></u>secworld.ph=
p?id=3D15579</a>).<br>

<br>
Following the workshop at NIST earlier this year the IAB and ISOC have been=
 reaching out to different players (and are still doing that) to continue t=
he conversation.<br>
<br>
We have put together a first document that describes the different proposal=
s (and as you can see the level of detail available for them and their matu=
rity varies greately). Here is the writeup:<br>
<a href=3D"http://tools.ietf.org/html/draft-tschofenig-iab-webpki-evolution=
-00" target=3D"_blank">http://tools.ietf.org/html/<u></u>draft-tschofenig-i=
ab-webpki-<u></u>evolution-00</a><br>
<br>
The analysis is still a bit weak and requires more work but the proposals a=
re hopefully captured accurately. Let us know whether there is something mi=
ssing.<br>
<br>
We hope that this could help to create move momentum behind certain proposa=
ls to get them accepted by the community and widely deployed.<br>
<br>
Ciao<br>
Hannes<br>
______________________________<u></u>_________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org" target=3D"_blank">perpass@ietf.org</a><=
br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/<u></u>listinfo/perpass</a><br>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>Website: <a =
href=3D"http://hallambaker.com/">http://hallambaker.com/</a><br>
</div>

--089e0160a67653df2d04e9594ce8--

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Date: Wed, 23 Oct 2013 08:32:54 +1300
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Cc: perpass <perpass@ietf.org>, Phillip Hallam-Baker <hallam@gmail.com>
Subject: Re: [perpass] Web-of-trust CAs
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On 23/10/2013 04:55, DataPacRat wrote:
> On Mon, Oct 21, 2013 at 4:46 PM, DataPacRat <datapacrat@gmail.com> wrote:
> 
>> Eg, if I trust my own vCard at a level of 100 decibans,
>> I trust Alice's card at 30, and Alice trusts Bob's card at 40, it's
>> easy to determine that Bob's card should be trusted at somewhere under
>> 30 decibans. (Real situations would be much more complicated, such as
>> with multiple assertion paths; but this is still early days.)

Excuse my ignorance, but while I have no difficulty understanding
Bayes' Theorem and know who invented decibans, I don't understand how
I can use a trust value that is different from 1 or 0, in practice.

I won't trust somebody with half my PIN code because they rate 47 decibans.

    Brian

> 
> I've just realized that not only might this problem be easier to solve
> than I expected, it might already be solved. After waking from an
> unusual dream, I've realized that it may be possible to analyze trust
> networks with the same tools used to measure electrical networks;
> specifically, by treating the user as a voltage source, any individual
> as a node, and their level of trust in another individual/node as
> conductivity (the inverse of resistance). There are plenty of existing
> tools to perform analysis of bizarre electrical architectures, so if
> this model has any validity, it should be reasonably trivial to apply
> them to trust architectures, to work out how much current/trust
> emanating from the source/user arrives at any given node/individual.
> 
> The question is whether this model /has/ any validity. I'm going to do
> all the reading I can think of on trust modeling, but would also
> appreciate any useful references anyone reading this might be able to
> offer. (I have a limited budget, so free-to-read references are
> preferred to paywalled ones.)
> 
> 
> Thank you for your time,
> --
> DataPacRat
> "Then again, I could be wrong."
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

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From: DataPacRat <datapacrat@gmail.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Cc: perpass <perpass@ietf.org>, Phillip Hallam-Baker <hallam@gmail.com>
Subject: Re: [perpass] Web-of-trust CAs
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On Tue, Oct 22, 2013 at 3:32 PM, Brian E Carpenter
<brian.e.carpenter@gmail.com> wrote:
> On 23/10/2013 04:55, DataPacRat wrote:
>> On Mon, Oct 21, 2013 at 4:46 PM, DataPacRat <datapacrat@gmail.com> wrote:

>>> Eg, if I trust my own vCard at a level of 100 decibans,
>>> I trust Alice's card at 30, and Alice trusts Bob's card at 40, it's
>>> easy to determine that Bob's card should be trusted at somewhere under
>>> 30 decibans. (Real situations would be much more complicated, such as
>>> with multiple assertion paths; but this is still early days.)
>
> Excuse my ignorance, but while I have no difficulty understanding
> Bayes' Theorem and know who invented decibans, I don't understand how
> I can use a trust value that is different from 1 or 0, in practice.
>
> I won't trust somebody with half my PIN code because they rate 47 decibans.

I could suggest that the values be interpreted in terms of LaPlace's
Sunrise formula - eg, "there's been 10 reports of the key being used
falsely and 500,000 that it's been used successfully: Do you wish to
continue?".

More usefully, though, I'd suggest that you already go through this
process today, with whatever security/privacy procedures you may use,
only qualitatively rather than quantitatively. Eg, if something like
this is used as a replacement for hierarchical CAs for https
transactions, then some practice and experiment would have been done
by then to figure out reasonable trust values for any given result.
Eg, "Below 0 decibans: Reject. 1-20 decibans: Warn user, show highest
trust paths, ask for confirmation. 20+ decibans: Proceed normally."

(Smart software would allow users to tweak their own thresholds, with
suitable warnings. Even smarter software would use more complicated
metrics involving calibrating the trust values reported by each
issuer, adding time-based factors, and so on.)

To you, as an end user, part of the goal of the infrastructure system
here is to fade into the background as much as possible, so that you
don't even realize it's there, and generally don't have to worry about
it, any more than you have to worry about what makes your browser give
a green-light to your bank's website today.


Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

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On Oct 22, 2013, at 9:33 AM, Phillip Hallam-Baker <hallam@gmail.com> =
wrote:

> Trust is not transitive but cost measures are pretty stable
>=20
> Producing a web of trust with a thousand bogus entries costs =
essentially nothing
>=20
> Producing such a web with twenty links to verified parties is much
> more expensive
>=20
> Incidentally, I can't claim any originality for the extended work
> factors I use as it happens. Although I came to them independently it
> turns out that a co collaborator had gone so far as to organize an
> event on the topic,
>=20
> But what I had not appreciated earlier is just what a difference it
> makes to cast the web of trust problem in terms of a work factor
> metric and introduce a combination of peer and ttp trust providers.

Dear Phillip,

Some hope to establish defenses for services that lack mandatory =
authentication.  Without authentication, any possible reaction would be =
based on unconfirmed suspicions as the only rational response.  Lack of =
authentication is often justified as a means to provide anonymity.  =
While enabling individual anonymity is fine, those managing a system =
that may initiate abuse must be authenticated and held accountable (to =
be responsive to reports of abuse).  Only those managing a system should =
be expected to attribute individual abuse based on internal accounts.  =
As such, this management can be done with anonymity as well.

Developing a group form of reputation for unauthenticated services as a =
means to avoid liabilities for errors made in identifying suspected =
abusive actors assumes dilution of these errors is a solution.  This =
approach can not be fair and represents a dangerous easily poisoned =
system.

Regards,
Douglas Otis







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On Tue, Oct 22, 2013 at 4:14 PM, DataPacRat <datapacrat@gmail.com> wrote:

> On Tue, Oct 22, 2013 at 3:32 PM, Brian E Carpenter
> <brian.e.carpenter@gmail.com> wrote:
> > On 23/10/2013 04:55, DataPacRat wrote:
> >> On Mon, Oct 21, 2013 at 4:46 PM, DataPacRat <datapacrat@gmail.com>
> wrote:
>
> >>> Eg, if I trust my own vCard at a level of 100 decibans,
> >>> I trust Alice's card at 30, and Alice trusts Bob's card at 40, it's
> >>> easy to determine that Bob's card should be trusted at somewhere under
> >>> 30 decibans. (Real situations would be much more complicated, such as
> >>> with multiple assertion paths; but this is still early days.)
> >
> > Excuse my ignorance, but while I have no difficulty understanding
> > Bayes' Theorem and know who invented decibans, I don't understand how
> > I can use a trust value that is different from 1 or 0, in practice.
> >
> > I won't trust somebody with half my PIN code because they rate 47
> decibans.
>
> I could suggest that the values be interpreted in terms of LaPlace's
> Sunrise formula - eg, "there's been 10 reports of the key being used
> falsely and 500,000 that it's been used successfully: Do you wish to
> continue?".
>

This is why I would not attempt to use Bayesian logic.

You have no way to measure probability reliably. An attacker can simulate
any behavior before they defect. The only measure that is useful is the
cost of simulating that behavior. If it is prohibitively high then we can
decide to trust them.

Remember that Bernie Madoff paid out 100% of every redemption request right
up to the point where the money ran out.


-- 
Website: http://hallambaker.com/

--001a11c3fe907b9a1204e95ab8da
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Tue, Oct 22, 2013 at 4:14 PM, DataPacRat <span dir=3D"ltr">&lt;<=
a href=3D"mailto:datapacrat@gmail.com" target=3D"_blank">datapacrat@gmail.c=
om</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im">On Tue, Oct 22, 2013 at 3:=
32 PM, Brian E Carpenter<br>
&lt;<a href=3D"mailto:brian.e.carpenter@gmail.com">brian.e.carpenter@gmail.=
com</a>&gt; wrote:<br>
&gt; On 23/10/2013 04:55, DataPacRat wrote:<br>
&gt;&gt; On Mon, Oct 21, 2013 at 4:46 PM, DataPacRat &lt;<a href=3D"mailto:=
datapacrat@gmail.com">datapacrat@gmail.com</a>&gt; wrote:<br>
<br>
&gt;&gt;&gt; Eg, if I trust my own vCard at a level of 100 decibans,<br>
&gt;&gt;&gt; I trust Alice&#39;s card at 30, and Alice trusts Bob&#39;s car=
d at 40, it&#39;s<br>
&gt;&gt;&gt; easy to determine that Bob&#39;s card should be trusted at som=
ewhere under<br>
&gt;&gt;&gt; 30 decibans. (Real situations would be much more complicated, =
such as<br>
&gt;&gt;&gt; with multiple assertion paths; but this is still early days.)<=
br>
&gt;<br>
&gt; Excuse my ignorance, but while I have no difficulty understanding<br>
&gt; Bayes&#39; Theorem and know who invented decibans, I don&#39;t underst=
and how<br>
&gt; I can use a trust value that is different from 1 or 0, in practice.<br=
>
&gt;<br>
&gt; I won&#39;t trust somebody with half my PIN code because they rate 47 =
decibans.<br>
<br>
</div>I could suggest that the values be interpreted in terms of LaPlace&#3=
9;s<br>
Sunrise formula - eg, &quot;there&#39;s been 10 reports of the key being us=
ed<br>
falsely and 500,000 that it&#39;s been used successfully: Do you wish to<br=
>
continue?&quot;.<br></blockquote><div><br></div><div>This is why I would no=
t attempt to use Bayesian logic.</div><div><br></div><div>You have no way t=
o measure probability reliably. An attacker can simulate any behavior befor=
e they defect. The only measure that is useful is the cost of simulating th=
at behavior. If it is prohibitively high then we can decide to trust them.<=
/div>
<div><br></div><div>Remember that Bernie Madoff paid out 100% of every rede=
mption request right up to the point where the money ran out.</div><div><br=
></div><div>=A0</div></div>-- <br>Website: <a href=3D"http://hallambaker.co=
m/">http://hallambaker.com/</a><br>

</div></div>

--001a11c3fe907b9a1204e95ab8da--

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Subject: Re: [perpass] NSA inspired PKIX limitations?
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Ben,
>
>
>>     ...
>     It might be worth emhpasizing that the principal reason cited for
>     not marking the extension critical, as per X,.509
>     and RFC 5280, was a single vendor's unwillingness to fix a bug in
>     their browser. The CABF members, being browser vendors
>     as well as third-party CAs, was the prefect venue in which elect
>     to given precedence to a vendor's intransigence.
>
> Even if that vendor had been willing to fix the bug, you'd still need 
> name constraints to be non-critical, or they'd break every outdated 
> browser. Which would mean they could not be used for many years. So 
> clearly they had to be non-critical, as will future extensions have to 
> be, I'm sure.
>
> So, I don't think the emphasis is worth it.
>
So, are you saying that other browsers also are not complaint with 5280 
in this respect, or is this more
or a rhetorical distinction?

Steve

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<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Ben,
    <blockquote
cite="mid:CABrd9SR4ErCjxf5XFZf3u1Dsepodh8LK_-oi8Zy4R4pEiSSNpA@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_extra">
          <div class="gmail_quote">
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              <div class="im"><br>
                <blockquote type="cite">
                  <div dir="ltr">
                    <div>...</div>
                  </div>
                </blockquote>
              </div>
              It might be worth emhpasizing that the principal reason
              cited for not marking the extension critical, as per
              X,.509<br>
              and RFC 5280, was a single vendor's unwillingness to fix a
              bug in their browser. The CABF members, being browser
              vendors<br>
              as well as third-party CAs, was the prefect venue in which
              elect to given precedence to a vendor's intransigence.
              <div class="im"><br>
                <blockquote type="cite">
                  <div dir="ltr">
                    <div> </div>
                  </div>
                </blockquote>
              </div>
            </blockquote>
          </div>
          Even if that vendor had been willing to fix the bug, you'd
          still need name constraints to be non-critical, or they'd
          break every outdated browser. Which would mean they could not
          be used for many years. So clearly they had to be
          non-critical, as will future extensions have to be, I'm sure.</div>
        <div class="gmail_extra"><br>
        </div>
        <div class="gmail_extra">So, I don't think the emphasis is worth
          it.</div>
        <div class="gmail_extra"><br>
        </div>
      </div>
    </blockquote>
    So, are you saying that other browsers also are not complaint with
    5280 in this respect, or is this more <br>
    or a rhetorical distinction?<br>
    <br>
    Steve<br>
  </body>
</html>

--------------040506010800020102050909--

From kent@bbn.com  Tue Oct 22 14:24:10 2013
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Subject: Re: [perpass] Web-of-trust CAs
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DataPacRat,
> ...
>
> The key item I am gathering from your response is 'trust is not
> transitive'. If that's the case, then wouldn't that also apply to
> chains of 'official' CAs, as well? If all that is so, then is it
> possible that ad-hoc / mesh-network / web-of-trust /
> (insert-buzzword-here) CAs would fare no worse by that metric than the
> current hierarchical CA system?
That is a fair comment for some PKIs, but not all.

If a PKI represents an _authoritative_ set of CAs, vs. a "trusted"
set of CAs, then this issue does not arise. So for example in the
DANE context or the RPKI context, we're not dealing with transitive trust.

Steve

--------------050206030001020503090202
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    DataPacRat,<br>
    <blockquote
cite="mid:CAB5WduCY+tE16RviFK_yC2nLPBTYkDYS_PePkNNXwoo9MJqYzA@mail.gmail.com"
      type="cite">
      <pre wrap="">...

The key item I am gathering from your response is 'trust is not
transitive'. If that's the case, then wouldn't that also apply to
chains of 'official' CAs, as well? If all that is so, then is it
possible that ad-hoc / mesh-network / web-of-trust /
(insert-buzzword-here) CAs would fare no worse by that metric than the
current hierarchical CA system?
</pre>
    </blockquote>
    That is a fair comment for some PKIs, but not all.<br>
    <br>
    If a PKI represents an <u>authoritative</u> set of CAs, vs. a
    "trusted"<br>
    set of CAs, then this issue does not arise. So for example in the<br>
    DANE context or the RPKI context, we're not dealing with transitive
    trust.<br>
    <br>
    Steve<br>
  </body>
</html>

--------------050206030001020503090202--

From housley@vigilsec.com  Tue Oct 22 14:42:59 2013
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Subject: Re: [perpass] Standards in the age of pervasive suspicion Re: NSA inspired PKIX limitations?
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Hannes:

>>> If people want technologies like DNSSEC/DANE or RPKI to be deployed =
in
>>> practice they are going to have to answer the difficult questions
>>> about how cryptography is used to concentrate power over the =
Internet
>>> infrastructure by a very narrow range of institutions, most of which
>>> are ultimately under US govt. control.
>>=20
>> To this we can only say that if the U.S. attempted to exert that
>> control, it would be widely noticed, and it would quickly lead to =
changes.
>=20
> Although I wasn't at the IAB at that time I recall that the RPKI =
decision for having a single trust anchor was everything but easy.
>=20
> Here is the IAB statement from that time:
> =
http://www.ietf.org/mail-archive/web/ietf-announce/current/msg07028.html
>=20
> Maybe Marcelo, who was at the IAB at that time, can say something =
about the discussions.

I was on the IAB when this statement was produced, and confidence in the =
cryptography had nothing to do with the discussion.

The long standing plan for deployment of the RPKI global trust anchor =
keeps it separate from all of the things that have US Government =
entanglements.  This decision was made a long time ago, and it remains =
the correct decision.

IANA administers the pool of IPv4 addresses, IPv6 addresses, and AS =
numbers, and IANA assigns these resources to the Regional Internet =
Registries (RIRs) for further assignment within their regions.  Thus, =
IANA is authoritative about the assignments made to RIRs, and RIRs are =
authoritative about assignments to the next level.  For this reason, the =
IAB said:

>  1. the RPKI should have a single authoritative trust anchor
>
>  2. this trust anchor should be aligned with the registry of the root
>    of the allocation hierarchy

The reason for these is included in the statement.

> The reasoning is of a technological nature and is as follows. A
> single root for the certification hierarchy significantly reduces
> the risk of two or more parties accidentally (or maliciously)
> issuing conflicting certifications for the same address block,
> because a single authoritative entity at the top-level of the
> allocation hierarchy is authoritative for both (a) the allocation of
> the address block and (b) the cryptographic certification of the
> fact that it did indeed allocate that address block.
>
> Thus, the IAB strongly recommends a single root aligned with the
> root of the address allocation hierarchy (now part of the IANA
> function). Doing so will minimize unnecessary complexity in the
> system, in particular virtually eliminating the possibility of
> resource conflicts in the system, reducing substantially the
> likelihood of errors as the allocation and certificate generation
> can be done together by the same operator.

Russ


From jmg@h2.funkthat.com  Tue Oct 22 14:50:59 2013
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Paul Hoffman wrote this message on Tue, Oct 22, 2013 at 08:26 -0700:
> This was posted last night by Viktor Dukhovni on the cryptography mailing
> list, but is certainly applicable here. Forwarded with Viktor's permission.
> 
> ====================
> 
> There have been many recent efforts to harden the cryptographic
> security of various systems.  I would like to urge anyone considering
> taking steps in that direction to exercise due caution.
> 
> Multiple recent attempts at improvement backfire in various ways:
> 
>    - RedHat has been under pressure for some time to enable EC support
>      in their OpenSSL RPM package.
> 
>     * They finally relented and added EC support ~1 week ago.  However,
>       they quickly decided to play it safe and enable just the Suite-B
>       curves: secp256r1, secp384r1 and no others.
> 
>     * They neglected to consider that the new libraries now
>       happily negotiate EECDH key exchange TLS cipher-suites with
>       servers that typically don't know of (or can't act on) the
>       client's limitations.
> 
>     * At the same time newly hardened SMTP servers at gmx.de
>       and other sites have "stronger" security by switching to
>       secp521r1.
> 
>       # Result: SMTP TLS handshakes break, and more mail goes out in
>         the clear!
> 
>       # With TLS, no EC is better than crippled EC.
> 
>    - GnuTLS sets aggressive client-side EDH prime-size lower bound.
> 
>     * Exim encounters interoperability problems and works-around
>       the setting by allowing 1024-bit EDH in SMTP clients while
>       using 2048-bit EDH in the server (which generally works for
>       SMTP).
> 
>     * Debian decides to improve security in Exim and raises this
>       to 2048-bits, breaking interoperability again.
> 
>        # Result:  Since SMTP TLS is generally opportunistic, when
>          TLS handshakes break, more mail is transmitted in the clear!
> 
>    - Some email administrators disable RC4 (enable only the OpenSSL "HIGH"
>      ciphers) in opportunistic TLS.  Many extant Microsoft Exchange servers
>      support only RC4-SHA1, RC4-MD5 and 3DES (whose implementation is
>      breaks post handshake in data transfer).
> 
>        # Result: TLS handshakes fail, and mail is sent in the clear.
> 
>    - There's lots of press about CRIME, BEAST, ... and some SMTP
>      administrators configure their systems to prefer RC4 and
>      avoid CBC ciphersuites.
> 
>     # The attacks in question are primarily HTTPS attacks,
>     cryptanalysis of RC4 may well be the greater threat to SMTP.

Is anyone working on an interop spread sheet?  Like limitations and
others...  I was looking at sendmail's TLS and realized it did 1024
DH (server) and 512 DH (client), but increasing DH beyond 1024 is a
problem since Java can't handle 1024 bit DH...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."

From datapacrat@gmail.com  Tue Oct 22 14:53:50 2013
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Date: Tue, 22 Oct 2013 17:53:23 -0400
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From: DataPacRat <datapacrat@gmail.com>
To: Phillip Hallam-Baker <hallam@gmail.com>
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Subject: Re: [perpass] Web-of-trust CAs
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On Tue, Oct 22, 2013 at 5:02 PM, Phillip Hallam-Baker <hallam@gmail.com> wrote:
> On Tue, Oct 22, 2013 at 4:14 PM, DataPacRat <datapacrat@gmail.com> wrote:

>> I could suggest that the values be interpreted in terms of LaPlace's
>> Sunrise formula - eg, "there's been 10 reports of the key being used
>> falsely and 500,000 that it's been used successfully: Do you wish to
>> continue?".
>
> This is why I would not attempt to use Bayesian logic.
>
> You have no way to measure probability reliably. An attacker can simulate
> any behavior before they defect. The only measure that is useful is the cost
> of simulating that behavior. If it is prohibitively high then we can decide
> to trust them.
>
> Remember that Bernie Madoff paid out 100% of every redemption request right
> up to the point where the money ran out.

One thing using Bayesian/LaPlacian numbers /can/ do is indicate how
much effort would need to have been exerted in order to simulate the
behaviour. If implemented correctly, then put simply, you can't get to
40 decibans of confidence without having had 10,000 successful tests
for every failed test.


Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From datapacrat@gmail.com  Tue Oct 22 14:56:34 2013
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From: DataPacRat <datapacrat@gmail.com>
To: Stephen Kent <kent@bbn.com>
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Subject: Re: [perpass] Web-of-trust CAs
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On Tue, Oct 22, 2013 at 5:24 PM, Stephen Kent <kent@bbn.com> wrote:
> DataPacRat,
>
> > ...
> >
> > The key item I am gathering from your response is 'trust is not
> > transitive'. If that's the case, then wouldn't that also apply to
> > chains of 'official' CAs, as well? If all that is so, then is it
> > possible that ad-hoc / mesh-network / web-of-trust /
> > (insert-buzzword-here) CAs would fare no worse by that metric than the
> > current hierarchical CA system?
>
> That is a fair comment for some PKIs, but not all.
>
> If a PKI represents an authoritative set of CAs, vs. a "trusted"
> set of CAs, then this issue does not arise. So for example in the
> DANE context or the RPKI context, we're not dealing with transitive trust.

I'm not familiar with many of the details of DANE and RPKI. Do either
of them provide any protection against a subpoena attack?



Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From sm@resistor.net  Tue Oct 22 22:56:51 2013
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Date: Tue, 22 Oct 2013 22:56:26 -0700
To: DataPacRat <datapacrat@gmail.com>
From: SM <sm@resistor.net>
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At 14:56 22-10-2013, DataPacRat wrote:
>I'm not familiar with many of the details of DANE and RPKI. Do either
>of them provide any protection against a subpoena attack?

DANE is specified in RFC 6698.  The DNSSEC Practice Statement for the 
Root Zone KSK Operator is at https://www.iana.org/dnssec/icann-dps.txt

Regards,
-sm




From hannes.tschofenig@gmx.net  Wed Oct 23 00:19:40 2013
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At 14:56 22-10-2013, DataPacRat wrote:
> Do either of them provide any protection against a subpoena attack?

Could you explain the 'subpoena attack' in more detail?

Ciao
Hannes

PS: I know what a subpoena is.

From linus@nordberg.se  Wed Oct 23 00:57:25 2013
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Subject: Re: [perpass] draft-tschofenig-perpass-surveillance-00.txt
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Hi Hannes,

Thanks for writing draft-tschofenig-perpass-surveillance-00. I wish I
could muster the powers needed to make text.

Generally, I lack information about what's often called meta-data or
traffic data and the key issue here -- linkability. I don't really know
what I want to say here. I started a private thread with Stephen about a
month ago but then dropped the ball. It's quite broad and I don't know
how to tackle it really.

Should 2.2 mention IPv4? Widely (heh) deployed protocol leaking
meta-data by design. I think it should be touched upon even if we don't
expect changes to it. Maybe that's exactly why we must mention it
somewhere -- some people do not grasp it while others might be hesitant
to touch the issue. IPv6 is another one. I bet there are more.


Typos and other minor things.

- Is the expire date 2014-04-24 correct?

- 2.1. s/a a/a/1

- 2.1. s/'crypto-aglity'/'crypto-agility'/1

- 2.2. s/exploided/exploited/1

- 2.4. last sentence "With the juridiction [...]" needs some love.

- 3. copied from another document

- 6. [10] and [11], swap Nadia and IETF


Http vs https. (Flogging a dead horse?)

- 6. the following urls could and should be https rather than http:
  http://packetstormsecurity.com/files/105499/Browser-Exploit-Against-SSL-TLS.html
  http://arstechnica.com/security/2013/09/stop-using-nsa-influence-code-in-our-product-rsa-tells-customers/
  http://crypto.stackexchange.com/questions/10263/should-we-trust-the-nist-recommended-ecc-parameters

- 6. (and other places) the following urls should be https even if they
  redirect to https, both for educational reasons and for security/privacy
  (not leaking the full url, not having to trust that a hijacker doesn't
  eat the redirect):
  http://www.ietf.org/mail-archive/web/perpass/current/maillist.html
  http://datatracker.ietf.org/drafts/current/

- 6. (and other places) the following urls should have a warning about
  not being https or perhaps have their content mirrored on a site
  providing https (with a proper certificate):
  http://boingboing.net/2013/08/05/anti-tor-malware-reported-back.html
  http://fileperms.org/whatsapp-is-broken-really-broken/ (bad certificate)
  http://www.wired.com/threatlevel/2013/09/nsa-router-hacking/ (bad certificate)
  http://www.tschofenig.priv.at (bad certificate)
  http://trustee.ietf.org/license-info (404)

From ynir@checkpoint.com  Wed Oct 23 01:10:58 2013
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From: Yoav Nir <ynir@checkpoint.com>
To: Hannes Tschofenig <Hannes.Tschofenig@gmx.net>
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Cc: SM <sm@resistor.net>, "<perpass@ietf.org>" <perpass@ietf.org>, DataPacRat <datapacrat@gmail.com>
Subject: Re: [perpass] Web-of-trust CAs
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On Oct 23, 2013, at 10:19 AM, Hannes Tschofenig <Hannes.Tschofenig@gmx.net>=
 wrote:

> At 14:56 22-10-2013, DataPacRat wrote:
>> Do either of them provide any protection against a subpoena attack?
>=20
> Could you explain the 'subpoena attack' in more detail?
>=20
> Ciao
> Hannes
>=20
> PS: I know what a subpoena is.

So do I, and AFAIK it can compel you to come and testify, or to hand over s=
ome documents. I don't think it can be used to force a CA to sign a certifi=
cate request or for whoever to register bad keys in the DNS.

Not saying a national government can't do either of these things, but not w=
ith a subpoena.

Yoav



From alexey.melnikov@isode.com  Wed Oct 23 04:52:10 2013
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From: Alexey Melnikov <alexey.melnikov@isode.com>
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Cc: perpass@ietf.org, Paul Hoffman <paul.hoffman@gmail.com>
Subject: Re: [perpass] Hasty PRISM proofing considered harmful
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Hi Stephen,

On 22/10/2013 17:46, Stephen Farrell wrote:
> Yep, that's a useful post - we shouldn't rush too much,
> but we do want to get things done so that developers
> and deployers have something to use.
>
> I wonder what's the best way to proceed with this kind
> of stuff. I guess we want a BCP of some sort, but the
> question is how to handle the various different cases
> of foo-with-tls.
>
> - Yaron did a generic TLS BCP draft. [1]
> - PSA did an XMPP TLS BCP draft [2]
> - This sounds like we might want an SMTP TLS BCP draft
>    or perhaps to add text to [3], but that's aiming for
>    experimental and is just about using DANE.
I think some generic fallback rules can be protocol independent. But 
needs of different protocols might be different. For example backward 
compatibility with deployed TLS ciphers might be different for XMPP and 
SMTP.

I think SMTP TLS BCP would be a good idea. I think it should be 
independent of DANE, because of the status of the DANE document. I would 
be happy to work on it (and would be happy to collaborate with PSA to 
discuss similarities and differences).
> So at present we're heading towards a bunch of foo-with-tls
> BCPs. Could those usefully be merged or are they better
> kept separate?
>
> Thoughts?
>
> S.
>
> [1] https://tools.ietf.org/html/draft-sheffer-tls-bcp
> [2] https://tools.ietf.org/html/draft-saintandre-xmpp-tls
> [3] https://tools.ietf.org/html/draft-ietf-dane-smtp-with-dane


From stephen.farrell@cs.tcd.ie  Wed Oct 23 05:02:42 2013
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Subject: Re: [perpass] Hasty PRISM proofing considered harmful
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On 10/23/2013 12:52 PM, Alexey Melnikov wrote:
> Hi Stephen,
> 
> On 22/10/2013 17:46, Stephen Farrell wrote:
>> Yep, that's a useful post - we shouldn't rush too much,
>> but we do want to get things done so that developers
>> and deployers have something to use.
>>
>> I wonder what's the best way to proceed with this kind
>> of stuff. I guess we want a BCP of some sort, but the
>> question is how to handle the various different cases
>> of foo-with-tls.
>>
>> - Yaron did a generic TLS BCP draft. [1]
>> - PSA did an XMPP TLS BCP draft [2]
>> - This sounds like we might want an SMTP TLS BCP draft
>>    or perhaps to add text to [3], but that's aiming for
>>    experimental and is just about using DANE.
> I think some generic fallback rules can be protocol independent. But
> needs of different protocols might be different. For example backward
> compatibility with deployed TLS ciphers might be different for XMPP and
> SMTP.

Sounds reasonable. I guess even if they have the same libraries
the update cycles might differ. (Anyone know?)

> I think SMTP TLS BCP would be a good idea. I think it should be
> independent of DANE, because of the status of the DANE document. I would
> be happy to work on it (and would be happy to collaborate with PSA to
> discuss similarities and differences).

Great. Let's talk in YVR about how to get that done so
its a real BCP that gets followed in the wild. If someone
else is up for helping I guess contact Alexey.

Cheers,
S.

>> So at present we're heading towards a bunch of foo-with-tls
>> BCPs. Could those usefully be merged or are they better
>> kept separate?
>>
>> Thoughts?
>>
>> S.
>>
>> [1] https://tools.ietf.org/html/draft-sheffer-tls-bcp
>> [2] https://tools.ietf.org/html/draft-saintandre-xmpp-tls
>> [3] https://tools.ietf.org/html/draft-ietf-dane-smtp-with-dane
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

From hhalpin@w3.org  Wed Oct 23 05:02:57 2013
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Subject: Re: [perpass] Hasty PRISM proofing considered harmful
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On 10/22/2013 05:26 PM, Paul Hoffman wrote:
> This was posted last night by Viktor Dukhovni on the cryptography 
> mailing list, but is certainly applicable here. Forwarded with 
> Viktor's permission.
>

Very good post - although the main problem seems to be fallback to 
cleartext in SMTP due to lack of co-ordination, not attempting better 
support of crypto.  Although this has historically not been the case, 
perhaps users may start wanting draconian error-handling as regards 
encrypted email between the client and server as a default. IMHO that is 
the only factor that could force co-ordination of better support of 
larger keys in the client and ECC curves. Obviously, this option already 
exists in most mail clients - yet users are typically unaware of the 
distinction (and the confusing terminological history re enforcement of 
TLS and StarTLS upgrading). While perhaps more draconian error-handling 
would help in standards rather than assuming cleartext fallback, it 
seems the real failure here is a usability issue with many mail clients 
where users are unaware their mail is being sent in the clear.

Right now, at least on Linux, Mozilla has effectively it seems stopped 
development on Thunderbird (truly a shame) so there's virtually no 
usable email clients.  Are folks aware of any that make "forcing TLS 
encryption" both the default and offer severe warnings if it fails?

> ====================
>
> There have been many recent efforts to harden the cryptographic
> security of various systems.  I would like to urge anyone considering
> taking steps in that direction to exercise due caution.
>
> Multiple recent attempts at improvement backfire in various ways:
>
>    - RedHat has been under pressure for some time to enable EC support
>      in their OpenSSL RPM package.
>
>     * They finally relented and added EC support ~1 week ago. However,
>       they quickly decided to play it safe and enable just the Suite-B
>       curves: secp256r1, secp384r1 and no others.
>
>     * They neglected to consider that the new libraries now
>       happily negotiate EECDH key exchange TLS cipher-suites with
>       servers that typically don't know of (or can't act on) the
>       client's limitations.
>
>     * At the same time newly hardened SMTP servers at gmx.de 
> <http://gmx.de>
>       and other sites have "stronger" security by switching to
>       secp521r1.
>
>       # Result: SMTP TLS handshakes break, and more mail goes out in
>         the clear!
>
>       # With TLS, no EC is better than crippled EC.
>
>    - GnuTLS sets aggressive client-side EDH prime-size lower bound.
>
>     * Exim encounters interoperability problems and works-around
>       the setting by allowing 1024-bit EDH in SMTP clients while
>       using 2048-bit EDH in the server (which generally works for
>       SMTP).
>
>     * Debian decides to improve security in Exim and raises this
>       to 2048-bits, breaking interoperability again.
>
>        # Result:  Since SMTP TLS is generally opportunistic, when
>          TLS handshakes break, more mail is transmitted in the clear!
>
>    - Some email administrators disable RC4 (enable only the OpenSSL "HIGH"
>      ciphers) in opportunistic TLS.  Many extant Microsoft Exchange 
> servers
>      support only RC4-SHA1, RC4-MD5 and 3DES (whose implementation is
>      breaks post handshake in data transfer).
>
>        # Result: TLS handshakes fail, and mail is sent in the clear.
>
>    - There's lots of press about CRIME, BEAST, ... and some SMTP
>      administrators configure their systems to prefer RC4 and
>      avoid CBC ciphersuites.
>
>     # The attacks in question are primarily HTTPS attacks,
>     cryptanalysis of RC4 may well be the greater threat to SMTP.
>
> There are I expect similar examples of good intentions, but poor
> outcomes outside the world of SMTP.  Raising the bar on Internet
> security will take considerable time and effort.  Updated standards
> will have to be developed, toolkits extended to support them and
> applications updated.  Rolling improved security out to end-users
> will likely take on the order of a decade.
>
> In the mean-time, users should make an effort to configure their
> systems to employ current best-practice security, trying to go
> beyond that into uncharted territory may well be counter-productive.
>
> Endpoint security and misuse of data at rest are still IMHO the
> bigger issues.  I am much more concerned about the proliferation
> of miniature programmable computers inside our computers (CPUs and
> programmable firmware in disk controllers, battery controllers,
> BMC controllers, with opaque binary firmware update blobs, and
> complex supply chains) that about secp256r1 vs secp521r1.
>
> We thought embedded devices were for physical infrastructure
> engineers to worry about, but now they are proliferating inside
> our general purpose computers.  The next Stuxnet will run on one
> of the invisible computers inside your computer.
>
> With concerted effort we can improve the crypto protocols, but will
> it matter if the architecture on top of which the crypto runs has
> an ever growing attack surface.
>
>
>
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


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    <div class="moz-cite-prefix">On 10/22/2013 05:26 PM, Paul Hoffman
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAPik8yaKaXRm3t3sepRHAFADCnOmdPjQC5-be3a8Xsr29965BQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">This was posted last night by Viktor Dukhovni on
        the cryptography mailing list, but is certainly applicable here.
        Forwarded with Viktor's permission.<br>
        <br>
      </div>
    </blockquote>
    <br>
    Very good post - although the main problem seems to be fallback to
    cleartext in SMTP due to lack of co-ordination, not attempting
    better support of crypto.&nbsp; Although this has historically not been
    the case, perhaps users may start wanting draconian error-handling
    as regards encrypted email between the client and server as a
    default. IMHO that is the only factor that could force co-ordination
    of better support of larger keys in the client and ECC curves.
    Obviously, this option already exists in most mail clients - yet
    users are typically unaware of the distinction (and the confusing
    terminological history re enforcement of TLS and StarTLS upgrading).
    While perhaps more draconian error-handling would help in standards
    rather than assuming cleartext fallback, it seems the real failure
    here is a usability issue with many mail clients where users are
    unaware their mail is being sent in the clear. <br>
    <br>
    Right now, at least on Linux, Mozilla has effectively it seems
    stopped development on Thunderbird (truly a shame) so there's
    virtually no usable email clients.&nbsp; Are folks aware of any that make
    "forcing TLS encryption" both the default and offer severe warnings
    if it fails? <br>
    <br>
    <blockquote
cite="mid:CAPik8yaKaXRm3t3sepRHAFADCnOmdPjQC5-be3a8Xsr29965BQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">====================<br>
        <br>
        There have been many recent efforts to harden the cryptographic<br>
        security of various systems.&nbsp; I would like to urge anyone
        considering<br>
        taking steps in that direction to exercise due caution.<br>
        <br>
        Multiple recent attempts at improvement backfire in various
        ways:<br>
        <br>
        &nbsp;&nbsp; - RedHat has been under pressure for some time to enable EC
        support<br>
        &nbsp;&nbsp;&nbsp;&nbsp; in their OpenSSL RPM package.<br>
        <br>
        &nbsp;&nbsp;&nbsp; * They finally relented and added EC support ~1 week ago.&nbsp;
        However,<br>
        &nbsp;&nbsp;&nbsp; &nbsp; they quickly decided to play it safe and enable just the
        Suite-B<br>
        &nbsp;&nbsp;&nbsp; &nbsp; curves: secp256r1, secp384r1 and no others.<br>
        <br>
        &nbsp;&nbsp;&nbsp; * They neglected to consider that the new libraries now<br>
        &nbsp;&nbsp;&nbsp; &nbsp; happily negotiate EECDH key exchange TLS cipher-suites
        with<br>
        &nbsp;&nbsp;&nbsp; &nbsp; servers that typically don't know of (or can't act on) the<br>
        &nbsp;&nbsp;&nbsp; &nbsp; client's limitations.<br>
        <br>
        &nbsp;&nbsp;&nbsp; * At the same time newly hardened SMTP servers at <a
          moz-do-not-send="true" href="http://gmx.de">gmx.de</a><br>
        &nbsp;&nbsp;&nbsp; &nbsp; and other sites have "stronger" security by switching to<br>
        &nbsp;&nbsp;&nbsp; &nbsp; secp521r1.<br>
        <br>
        &nbsp;&nbsp;&nbsp; &nbsp; # Result: SMTP TLS handshakes break, and more mail goes
        out in<br>
        &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; the clear!<br>
        <br>
        &nbsp;&nbsp;&nbsp; &nbsp; # With TLS, no EC is better than crippled EC.<br>
        <br>
        &nbsp;&nbsp; - GnuTLS sets aggressive client-side EDH prime-size lower
        bound. <br>
        <br>
        &nbsp;&nbsp;&nbsp; * Exim encounters interoperability problems and works-around<br>
        &nbsp;&nbsp;&nbsp; &nbsp; the setting by allowing 1024-bit EDH in SMTP clients while<br>
        &nbsp;&nbsp;&nbsp; &nbsp; using 2048-bit EDH in the server (which generally works
        for<br>
        &nbsp;&nbsp;&nbsp; &nbsp; SMTP).<br>
        <br>
        &nbsp;&nbsp;&nbsp; * Debian decides to improve security in Exim and raises this<br>
        &nbsp;&nbsp;&nbsp; &nbsp; to 2048-bits, breaking interoperability again.<br>
        <br>
        &nbsp;&nbsp;&nbsp; &nbsp;&nbsp; # Result:&nbsp; Since SMTP TLS is generally opportunistic,
        when<br>
        &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; TLS handshakes break, more mail is transmitted in the
        clear!<br>
        <br>
        &nbsp;&nbsp; - Some email administrators disable RC4 (enable only the
        OpenSSL "HIGH"<br>
        &nbsp;&nbsp;&nbsp;&nbsp; ciphers) in opportunistic TLS.&nbsp; Many extant Microsoft
        Exchange servers<br>
        &nbsp;&nbsp;&nbsp;&nbsp; support only RC4-SHA1, RC4-MD5 and 3DES (whose
        implementation is<br>
        &nbsp;&nbsp;&nbsp;&nbsp; breaks post handshake in data transfer).<br>
        <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # Result: TLS handshakes fail, and mail is sent in the
        clear.<br>
        <br>
        &nbsp;&nbsp; - There's lots of press about CRIME, BEAST, ... and some SMTP<br>
        &nbsp;&nbsp;&nbsp;&nbsp; administrators configure their systems to prefer RC4 and<br>
        &nbsp;&nbsp;&nbsp;&nbsp; avoid CBC ciphersuites.<br>
        <br>
        &nbsp;&nbsp;&nbsp; # The attacks in question are primarily HTTPS attacks,<br>
        &nbsp;&nbsp;&nbsp; cryptanalysis of RC4 may well be the greater threat to SMTP.<br>
        <br>
        There are I expect similar examples of good intentions, but poor<br>
        outcomes outside the world of SMTP.&nbsp; Raising the bar on Internet<br>
        security will take considerable time and effort.&nbsp; Updated
        standards<br>
        will have to be developed, toolkits extended to support them and<br>
        applications updated.&nbsp; Rolling improved security out to
        end-users<br>
        will likely take on the order of a decade.<br>
        <br>
        In the mean-time, users should make an effort to configure their<br>
        systems to employ current best-practice security, trying to go<br>
        beyond that into uncharted territory may well be
        counter-productive.<br>
        <br>
        Endpoint security and misuse of data at rest are still IMHO the<br>
        bigger issues.&nbsp; I am much more concerned about the proliferation<br>
        of miniature programmable computers inside our computers (CPUs
        and<br>
        programmable firmware in disk controllers, battery controllers,<br>
        BMC controllers, with opaque binary firmware update blobs, and<br>
        complex supply chains) that about secp256r1 vs secp521r1.<br>
        <br>
        We thought embedded devices were for physical infrastructure<br>
        engineers to worry about, but now they are proliferating inside<br>
        our general purpose computers.&nbsp; The next Stuxnet will run on one<br>
        of the invisible computers inside your computer.<br>
        <br>
        With concerted effort we can improve the crypto protocols, but
        will<br>
        it matter if the architecture on top of which the crypto runs
        has<br>
        an ever growing attack surface.<br>
        <br>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
perpass mailing list
<a class="moz-txt-link-abbreviated" href="mailto:perpass@ietf.org">perpass@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/perpass">https://www.ietf.org/mailman/listinfo/perpass</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>

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From kent@bbn.com  Wed Oct 23 07:43:19 2013
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SM,

> Hi Hannes,
> At 23:14 21-10-2013, Hannes Tschofenig wrote:
>> In context of the cryptographic primitives we certainly have relied a 
>> lot on NIST, which is reflected in the number of presentations at the 
>> SAAG meetings.
>>
>> We have made too few attempts to reach out to other communities (if 
>> those even exist) to hear other views. I once talked to Bart Preneel, 
>> who is involved in the European crypto community, to attend an IETF 
>> meeting but (for whatever reason) it didn't work out.
>>
>> Maybe that's something to think about?
>
> There are several governments which rely on NIST. It's difficult to 
> say whether there will be a shift away from that.
NIST creates standards that are mandatory only for US Gov use. (Even 
then it's standards may be waived by a gov
agency if the agency head believes the costs are too great.) However, I 
agree that NIST crypto standards tend to
be widely adopted by folks around the world on a voluntary basis.
> In this age of suspicion a single-source provider is not a good idea. 
> If the IETF decides to review and re-review its protocols it would be 
> good to have input from other communities (re. what you mentioned above).

The major NIST crypto standards are the result of solicitations that are 
open to the world, at least
in the recent past.AES was developed by two Belgians. SHA-3 is the 
result of work more Belgians.
Should we infer that NSA co-opted theseBelgian crypto experts?

I think it is appropriate to focus on specific NIST crypto standards 
that may have been inappropriately influenced,
rather than assuming that every NIST crypto standard is suspect. So far, 
the only NIST crypto standard I've seen for
which there appears to be an objectively-justified concern is the PRNG 
based on ECC.

Steve



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On Oct 23, 2013, at 7:43 AM, Stephen Kent <kent@bbn.com> wrote:
> The major NIST crypto standards are the result of solicitations that =
are open to the world, at least
> in the recent past.AES was developed by two Belgians. SHA-3 is the =
result of work more Belgians.
> Should we infer that NSA co-opted theseBelgian crypto experts?

Rijndael was accepted unchanged as AES.  Thats why as part of =
everything, people still trust it.

Keccak however, is being mysteriously changed in the SHA-3 process, =
which is not inspiring confidence in the process:

https://www.schneier.com/blog/archives/2013/10/will_keccak_sha-3.html

--
Nicholas Weaver                  it is a tale, told by an idiot,
nweaver@icsi.berkeley.edu                full of sound and fury,
510-666-2903                                 .signifying nothing
PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub.asc


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From: Paul Wouters <paul@nohats.ca>
To: Paul Hoffman <paul.hoffman@gmail.com>
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Cc: perpass@ietf.org, Paul Wouters <pwouters@redhat.com>
Subject: Re: [perpass] Hasty PRISM proofing considered harmful
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On Tue, 22 Oct 2013, Paul Hoffman wrote:

[ With my Red Hat on but using personal email to prevent moderation queues ]

>    - RedHat has been under pressure for some time to enable EC support
>      in their OpenSSL RPM package.
> 
>     * They finally relented and added EC support ~1 week ago.  However,
>       they quickly decided to play it safe and enable just the Suite-B
>       curves: secp256r1, secp384r1 and no others.

Note that "quickly decided" is a little judgemental and unfair. Enabling
ECC has been at least a year in the making. It predates Snowden.

>     * They neglected to consider that the new libraries now
>       happily negotiate EECDH key exchange TLS cipher-suites with
>       servers that typically don't know of (or can't act on) the
>       client's limitations.

The elliptic_curves extension informs a server which curves the client
supports, and openssl uses that extension. So that should not be a
problem. However, Hubert Kario found out that we advertise support for
curves that are not actually supported. We are addressing that bug now:

https://bugzilla.redhat.com/show_bug.cgi?id=1022468
Openssl advertises support for curves it doesn't actually support in Client Hello (edit)

Remember, bugs are resolved faster if reported properly. Please feel
free to contact me regarding any security/crypto bugs in RHEL/Fedora
and I'll ensure proper bugs are filed and tracked.

>     * At the same time newly hardened SMTP servers at gmx.de
>       and other sites have "stronger" security by switching to
>       secp521r1.

With the above bug addressed, it should select a non-ECC cipher suite.

> Rolling improved security out to end-users will likely take on the order of a decade.

Wow, that's rather pessimistic :P

> In the mean-time, users should make an effort to configure their
> systems to employ current best-practice security, trying to go
> beyond that into uncharted territory may well be counter-productive.

Users should not do so. Vendors should do it for them. Users who tweak
crypto parameters manually are not users - they are developers.

Paul

From datapacrat@gmail.com  Wed Oct 23 07:56:26 2013
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From: DataPacRat <datapacrat@gmail.com>
To: Hannes Tschofenig <hannes.tschofenig@gmx.net>
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Cc: SM <sm@resistor.net>, perpass <perpass@ietf.org>
Subject: Re: [perpass] Web-of-trust CAs
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On Wed, Oct 23, 2013 at 3:19 AM, Hannes Tschofenig
<hannes.tschofenig@gmx.net> wrote:
> At 14:56 22-10-2013, DataPacRat wrote:

>> Do either of them provide any protection against a subpoena attack?
>
> Could you explain the 'subpoena attack' in more detail?
>
> Ciao
> Hannes
>
> PS: I know what a subpoena is.

An exemplar could be the attack against Lavabit's customers, which was
only prevented by Lavabit shutting down entirely. More generally, it's
a government issuing some sort of demand, often secret, to an online
service provider, requiring at least that they hand over various keys,
occasionally much more. 'Subpoena' is a placeholder for any similar
document, such as court orders, search warrants, and the American
"National Security Letters". A tad sillily, it's the official
bureaucratic version of lead pipe cryptoanalysis, with lots more
paperwork, and with the claim that the group making the threats have
legitimacy in doing so because they're the government.


My general thought, as of the start of this thread, is that such
attacks could be made much harder to implement and much less effective
by massively increasing the number of CAs (essentially, by turning
everyone into a CA). Sending a lone piece of paper to a single
middle-manager would no longer force sufficient compliance to track
the online behaviour of thousands-to-millions of individuals. Should
measurable effort be required in order to spy on any one individual,
then it seems at least possible that simple budgetary concerns would
reduce the amount of spying done on ordinary citizens. (Of course, my
current .sig quote might apply.)


Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From kent@bbn.com  Wed Oct 23 08:05:03 2013
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Subject: Re: [perpass] Web-of-trust CAs
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DataPacRat,
> On Tue, Oct 22, 2013 at 5:24 PM, Stephen Kent <kent@bbn.com> wrote:
>> DataPacRat,
>>
>>> ...
>>>
>>> The key item I am gathering from your response is 'trust is not
>>> transitive'. If that's the case, then wouldn't that also apply to
>>> chains of 'official' CAs, as well? If all that is so, then is it
>>> possible that ad-hoc / mesh-network / web-of-trust /
>>> (insert-buzzword-here) CAs would fare no worse by that metric than the
>>> current hierarchical CA system?
>> That is a fair comment for some PKIs, but not all.
>>
>> If a PKI represents an authoritative set of CAs, vs. a "trusted"
>> set of CAs, then this issue does not arise. So for example in the
>> DANE context or the RPKI context, we're not dealing with transitive trust.
> I'm not familiar with many of the details of DANE and RPKI. Do either
> of them provide any protection against a subpoena attack?
I'll let other folks comment on DANE, right Warren?

As for the RPKI, first note that it is a PKI that provides
authenticated info about who holds which blocks of IP address
space, and thus encryption is not an issue. I recently published
an I-D (draft-kent-sidr-suspenders-00) that tries to address concerns
that have been raised by some folks about possible law enforcement
influence on the CAs in the hierarchy. The focus here is at influence
that might be effected across national boundaries.

Steve

From paul@cypherpunks.ca  Wed Oct 23 08:22:51 2013
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On Wed, 23 Oct 2013, DataPacRat wrote:

>>> Do either of them provide any protection against a subpoena attack?

> An exemplar could be the attack against Lavabit's customers, which was
> only prevented by Lavabit shutting down entirely. More generally, it's
> a government issuing some sort of demand, often secret, to an online
> service provider, requiring at least that they hand over various keys,
> occasionally much more.

> My general thought, as of the start of this thread, is that such
> attacks could be made much harder to implement and much less effective
> by massively increasing the number of CAs (essentially, by turning
> everyone into a CA).

That's basically what DANE does. Everyone becomes their own CA within
their own domain, by securely (DNSSEC) publishing TLS public keys.

You still need to run these TLS servers yourself to protect against the
"subpoena attack". So it won't help you with ISPs offering TLS.

But if I run a TLS server in my own infrastructure and publish my TLS
key using DANE as I do:

  dig +short tlsa _443._tcp.nohats.ca
3 0 1 6327233AE15A460A4AD9875C547FE83208924387E09F3A18E6594D4A CCDF5D87

Then no "subpoena attack" could be launched. They could force a
registrar or TLD to change the delegation of my domain by modifying the
DS and NS records at the parent (.ca) and point to their own TLS server
using a modified TLSA record, but this would be clearly visible to the
entire world (and hopefully me, as my server would not be getting any
traffic anymore)

The only defense against a "subpoena attack" is not outsourcing your
end to end encryption. That's what we need to facilitate. Where we do
need to depend on others for delegation, it should be public and we
should have notaries/transparency/logs. Any such change should be
visibly globally and to everyone to avoid targeted attacks.

Paul

From Jeff.Hodges@KingsMountain.com  Wed Oct 23 08:28:13 2013
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Subject: [perpass] fyi: Dan Geer: Tradeoffs in Cyber Security [9 October 13, UNCC[
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.Tradeoffs in Cyber Security
.Dan Geer, 9 October 13, UNCC
<http://geer.tinho.net/geer.uncc.9x13.txt>

Thank you for the invitation to speak with you today, which, let
me be clear, is me speaking as myself and not for anybody or anything
else.  As you know, I work the cybersecurity trade, and I am gratified
that ten days ago the U.S. National Academy of Sciences, on behalf
of the Department of Homeland Security, concluded that cybersecurity
should be seen as an occupation and not a profession because the
rate of change is too great to consider professionalization.[1]
That rate of change is why cybersecurity is perhaps the most
intellectually demanding occupation on the planet.  In writing this
essay, the breadth of tradeoffs in cyber security and that fundamental
intellectual challenge in those tradeoffs caused me to choose to
narrow my focus to one class of tradeoffs in cyber security rather
than them all; looking at the state of the current world, I decided
to focus on personal data and the government.

I am not yet old in chronologic years when compared to the life
expectancies that obtain in the United States of 2013, but measured
in Internet years I'm an ancient.  Ancient-ness makes it tempting
to just tell stories that begin with "In my day" which, if nothing
else, proves that you are no longer in the century in which you
actually belong.  Stories are good, but as economist Roger Brinner
so succinctly said, "The plural of anecdote is not data."

Except that maybe it, or something like it, is.  In a gathering of
this size you can play a game that I'll just describe rather than
play.  Ask for an audience volunteer willing to answer a mildly
embarrassing question, something as mild as "How many pairs of
never-used underwear do you own?"  Then see if that volunteer will
take a second question, and make it similarly mild such as "Have
you ever had an evil grin while wrapping a birthday gift?"  If you
keep going at this game, the volunteer will become uneasy and no
one will get to the proverbial "twenty questions."  Why?  Because
the subject realizes that you are publicly triangulating them, that
data fusion of even mild, innocuous questions has the effect of
painting a picture.  In this game, the questions cannot be mild
enough to be innocuous in sum.  In point of fact, the more inane
the questions are, the more inane the picture painted becomes.

If you get to pick the questions and the subject is sufficiently
willing to keep answering them, then you can pretty much box in
your subject however you like.  Politicians know that the surest
way to win an argument is, as they say, to "frame the question" by
which they mean painting a picture that their opposition has to
work to overcome.  The better practitioners at the political version
of this game can impose a considerable work factor on their opponents,
one that is not unlike what we here call a denial of service.  Every
time there is a televised debate where some self-important interlocutor
asks a question that is impossible to answer succinctly, and then
gives the candidate sixty seconds of airtime, painting into a corner
by way of selective disclosure is what is happening.

I previously worked for a data protection company.  Our product
was, and I believe still is, the most thorough on the market.  By
"thorough" I mean the dictionary definition, "careful about doing
something in an accurate and exact way."  To this end, installing
our product instrumented every system call on the target machine.
Data did not and could not move in any sense of the word "move"
without detection.  Every data operation was caught and monitored.
It was total surveillance data protection.  Its customers were
companies that don't accept half-measures.  What made this product
stick out was that very thoroughness, but here is the point: Unless
you fully instrument your data handling, it is not possible for you
to say what did not happen.  With total surveillance, and total
surveillance alone, it is possible to treat the absence of evidence
as the evidence of absence.  Only when you know everything that
*did* happen with your data can you say what did *not* happen with
your data.

The alternative to total surveillance of data handling is to answer
more narrow questions, questions like "Can the user steal data with
a USB stick?" or "Does this outbound e-mail have a Social Security
Number in it?"  Answering direct questions is exactly what a defensive
mindset says you must do, and that is "never make the same mistake
twice."  In other words, if someone has lost data because of misuse
of some facility on the computer, then you either disable that
facility or you wrap it in some kind of perimeter.  Lather, rinse,
and repeat.  This extends all the way to such trivial matters as
timer-based screen locking.

The difficulty with the defensive mindset is that it leaves in place
the fundamental strategic asymmetry of cybersecurity, namely that
while the workfactor for the offender is the price of finding a new
method of attack, the workfactor for the defender is the cumulative
cost of forever defending against all attack methods yet discovered.
Over time, the curve for the cost of finding a new attack and the
curve for the cost of defending against all attacks to date cross.
Once those curves cross, the offender never has to worry about being
out of the money.  I believe that that crossing occurred some time
ago.

The total surveillance strategy is, to my mind, an offensive strategy
used for defensive purposes.  It says "I don't know what the
opposition is going to try, so everything is forbidden unless we
know it is good."  In that sense, it is like whitelisting applications.
Taking either the application whitelisting or the total data
surveillance approach is saying "That which is not permitted is
forbidden."

The essential character of a free society is this: That which is
not forbidden is permitted.  The essential character of an unfree
society is the inverse, that which is not permitted is forbidden.
The U.S. began as a free society without question; the weight of
regulation, whether open or implicit, can only push it toward being
unfree.  Under the pressure to defend against offenders with a
permanent structural advantage, defenders who opt for forbidding
anything that is not expressly permitted are encouraging a computing
environment that does not embody the freedom with which we are
heretofore familiar.

This brings us to the larger question.  No one in this room needs
to be told that more and more data is collected and more and more
of that data is in play.  The general dynamics of change are these:
Moore's Law continues to give us two orders of magnitude in compute
power per dollar per decade while storage grows at three orders of
magnitude and bandwidth at four.  These are top-down economic
drivers.  As such, the future is increasingly dense with stored
data but, paradoxically, despite the massive growth of data volume,
that data becomes more mobile with time.

Everyone here knows the terminology "attack surface" and knows that
one of the defender's highest goals is to minimize the attack surface
wherever possible.  Every coder adhering to a security-cognizant
software lifecycle program does this.  Every company or research
group engaged in static analysis of binaries does this.  Every
agency enforcing a need-to-know regime for data access does this.
Every individual who reserves one low-limit credit card for their
Internet purchases does this.  I might otherwise say that any person
who encrypts their e-mail to their closest counterparties does this,
but because consistent e-mail encryption is so rare, encrypting
one's e-mail marks it for collection and indefinite retention by
those entities in a position to do so, regardless of what country
you live in.

Data retention for observable data is growing by legislative fiat
seemingly everywhere.  The narrow logic is sound, namely if data
has passed through your hands then that you retain it has no new
risk for the transmitter and may contain valuable protections against
malfeasance.  In parallel with the game I proposed at the outset,
neither you nor I would be concerned with some entity having access
to one of our transmitted messages, but 1000 of them is a different
story, and all-of-them forever is a different world.

I have not yet said the phrase that is the title of this talk, which
is "Tradeoffs in Cyber Security."  Perhaps you will soon see why
I am slow to do so.  As is frequently noted, in the United States
90+% of the critical infrastructure is in private hands.  With each
passing day Internet-dependent services become more essential to
what I will for the moment call "normal life."  As we have seen,
the Government's response to the growing pervasiveness of Internet
services held in private hands is deputize the owners of those
services against their will.  The entire imbroglio around ISPs, the
NSA, and so forth and so on comes down to that -- if the government
does not itself own the critical infrastructure, those that do own
it can and will be compelled to become government agents.  In the
21st century, we have a physical army of volunteers but a digital
army of conscripts.

At the core of it all there is data.  The great majority of attacks
target data acquisition.  The work of surveillance is, per se,
targeted data acquisition.  There is considerable irony in the
Federal Communications Commission classifying the Internet as an
information service and not as a communications service insofar as
while that may have been a gambit to relieve ISPs of telephone-era
regulation, the value of the Internet is ever more the bits it
carries, not the carriage of those bits.  The FCC decisions are
both several and now old, the FCC classified cable as an information
service in 2002, classified DSL as an information service in 2005,
classified wireless broadband as an information service in 2007,
and classified broadband over power lines as an information service
in 2008.  A decision by the D.C. Circuit Court of Appeals on this
very point is pending as we speak: Is the Internet a telecommunications
service or an information service?

If I ran the zoo, I would call up the ISPs and say

   Hello, Uncle Sam here.

   You can charge whatever you like based on the contents of what
   you are carrying, but you are responsible for that content if it
   is illegal; inspecting brings with it a responsibility for what
   you learn.
    -or-
   You can enjoy common carrier protections at all times, but you
   can neither inspect nor act on the contents of what you are
   carrying and can only charge for carriage itself.  Bits are bits.

   Choose wisely.  No refunds or exchanges at this window.

We humans can design systems more complex than we can then operate.
The financial sector's "flash crashes" are an example of that;
perhaps the fifty interlocked insurance exchanges for Obamacare
will soon be another.  Above some threshold of system complexity,
it is no longer possible to test, it is only possible to react to
emergent behavior.  Even the lowliest Internet user is involved --
one web page can easily touch scores of different domains.  While
writing this, the top level page from cnn.com had 400 out-references
to 85 unique domains each of which is likely to be similarly
constructed and all of which move data one way or another.  If you
leave those pages up and they have an auto-refresh, then moving to
a new network signals to every one of those ad networks that you
have done so.

We have known for some time that traffic analysis is more powerful
than content analysis.  If I know everything about to whom you
communicate including when, where, with what inter-message latency
and at what length, then I know you.  If all I have is the undated,
unaddressed text of your messages, then I am an archaeologist, not
a case officer.  The soothing mendacity of proxies for the President
saying "It's only metadata" relies on the ignorance of the listener.

But this is not an attack on the business of intelligence.  The
Intelligence Community is operating under the rules it knows, most
of which you, too, know, and the goal states it has been tasked to
achieve.  The center of gravity for policy is those goal states.

We all know the truism, that knowledge is power.  We all know that
there is a subtle yet important distinction between information and
knowledge.  We all know that a negative declaration like "X did not
happen" can only proven true if you have the enumeration of
*everything* that did happen and can show that X is not in it.  We
all know that when a President says "Never again" he is asking for
the kind of outcome for which proving a negative, lots of negatives,
is categorically essential.  Proving a negative requires omniscience.
Omniscience requires god-like powers.

Perhaps the point is that the more technologic the society becomes,
the greater the dynamic range of possible failures.  When you live
in a cave, starvation, predators, disease, and lightning are about
the full range of failures that end life as you know it and you are
well familiar with all of them.  When you live in a technologic
society where everybody and everything is optimized in some way
akin to just-in-time delivery, the dynamic range of failures is
incomprehensibly larger and largely incomprehensible.  The wider
the dynamic range of failure, the more prevention is the watchword.
Cadres of people charged with defending masses of other people must
focus on prevention, and prevention is all about proving negatives.
Therefore, one must conclude that as technologic society grows more
interdependent within itself, the more it must rely on prediction
based on data collected in broad ways, not targeted ways.

Spoken of in this manner, intelligence agencies that hoover up
everything are reacting rationally to the demand that they ensure
"Never again" comes true.  Not only that, the more complex the
society they are charged with protecting becomes, the more they
must surveil, the more they must analyze, the more data fusion
becomes their only focus.

Part of the picture is that it is categorically true that technology
is today far more democratically available than it was yesterday
and less than it will be tomorrow.  3D printing, the whole "maker"
community, DIY biology, micro-drones, search, constant contact with
whomever you choose to be in constant contact with -- these are all
examples of democratizing technology.  This is perhaps our last
fundamental tradeoff before the Singularity occurs: Do we, as a
society, want the comfort and convenience of increasingly technologic,
invisible digital integration enough to pay for those benefits with
the liberties that must be given up to be protected from the downsides
of that integration?

This is not a Chicken Little talk, it is an attempt to preserve if
not make a choice while choice is still relevant.  We are ever more
a service economy, but every time an existing service disappears
into the cloud, our vulnerability to its absence increases.  Every
time we ask the government to provide goodnesses that can only be
done with more data, we are asking government to collect more data.
Let me ask a yesterday question: How do you feel about traffic jam
detection based on the handoff rate between cell towers of those
cell phones in use in cars on the road?  Let me ask a today question:
How do you feel about auto insurance that is priced from a daily
readout of your automobile's black box?  Let me ask a tomorrow
question: In what calendar year will compulsory auto insurance be
more expensive for the driver who insists on driving their car
themselves rather than letting a robot do it?  How do you feel about
public health surveillance done by requiring Google and Bing to
report on searches for cold remedies and the like?  How do you feel
about a Smart Grid that reduces your power costs and greens the
atmosphere but reports minute-by-minute what is on and what is off
in your home?  Have you or would you install that toilet that does
a urinalysis with every use?

How do you feel about using standoff biometrics as a solution to
authentication?  At this moment in time, facial recognition is
possible at 500 meters, iris recognition is possible at 50 meters,
and heart-beat recognition is possible at 5 meters.  Your dog can
identify you by smell; so, too, can an electronic dog's nose.  Your
cell phone's accelerometer is plenty sensitive enough to identify
you by gait analysis.  There are 3+ billion new photos online each
month, and even if you've never uploaded photos of yourself someone
else has.  All of these are data dependent, cheap, convenient, and
none of them reveal anything that is a secret as we currently
understand the term "secret" yet the sum of them is greater than
the parts.

Everyone in this room knows how and why passwords are a problem.
At the same time, passwords may be flatly essential for a reason
that requires I read a paragraph from Marcia Hofmann's September
12th piece in Wired[2]

    If the police try to force you to divulge the combination to a
    wall safe, your response would reveal the contents of your mind
    and so would implicate the Fifth Amendment.  (If you've written
    down the combination on a piece of paper and the police demand
    that you give it to them, that may be a different story.)

    To invoke Fifth Amendment protection, there may be a difference
    between things we have or are -- and things we know.  The important
    feature about PINs and passwords is that they're generally
    something we know.  These memory-based authenticators are the
    type of fact that benefit from strong Fifth Amendment protection
    should the government try to make us turn them over against our
    will.  Indeed, last year a federal appeals court held that a man
    could not be forced by the government to decrypt data.

    But if we move toward authentication systems based solely on
    physical tokens or biometrics -- things we have or things we
    are, rather than things we remember -- the government could
    demand that we produce them without implicating anything we know.
    Which would make it less likely that a valid privilege against
    self-incrimination would apply.

As Hofmann notes, a Court could find otherwise and set a different
precedent, but her analysis is cautionary.  Perhaps a balance of
power requires the individual actually does have some secrets.  But
is having some secrets the same as having some privacy?

No society, no people need rules against things which are impossible.
Today I observe a couple fornicating on a roof top in circumstances
where I can never know who the couple are.  Do they have privacy?
The answer is "no" if your definition of privacy is the absence of
observability.  The answer is "yes" if your definition of privacy
is the absence of identifiability.

Technical progress in image acquisition guarantees observability
pretty much everywhere now.  Those standoff biometrics are delivering
multi-factor identifiability at ever greater distances.  We will
soon live in a society where identity is not an assertion like "My
name is Dan," but rather an observable like "Sensors confirm that
is Dan."  With enough sensors, concentration camps don't need to
tatoo their inmates.  How many sensors are we installing in normal
life?

If data kills both privacy as impossible-to-observe and privacy as
impossible-to-identify, then what might be an alternative?  If you
are an optimist or an apparatchik, then your answer will tend toward
rules of procedure administered by a government you trust or control.
If you are a pessimist or a hacker/maker, then your answer will
tend towards the operational, and your definition of a state of
privacy will be mine: the effective capacity to misrepresent yourself.

Misrepresentation is using disinformation to frustrate data fusion
on the part of whomever it is that is watching you.  Misrepresentation
means paying your therapist in cash under an assumed name.
Misrepresentation means arming yourself not at Walmart but in living
rooms.  Misrepresentation means swapping affinity cards at random
with like-minded folks.  Misrepresentation means keeping an inventory
of misconfigured webservers to proxy through.  Misrepresentation
means putting a motor-generator between you and the Smart Grid.
Misrepresentation means using Tor for no reason at all.  Misrepresentation
means hiding in plain sight when there is nowhere else to hide.
Misrepresentation means having not one digital identity that you
cherish, burnish, and protect, but having as many as you can.  Your
identity is not a question unless you work to make it be.

The Obama administration's issuance of a National Strategy for
Trusted Identities in Cyberspace is case-in-point; it "calls for
the development of interoperable technology standards and policies
-- an 'Identity Ecosystem' -- where individuals, organizations, and
underlying infrastructure -- such as routers and servers -- can be
authoritatively authenticated."  If you can trust a digital identity,
that is because it can't be faked.  Why does the government care
about this?  It cares because it wants to digitally deliver government
services and it wants attribution.  Is having a non-fake-able digital
identity for government services worth the registration of your
remaining secrets with that government?  Is there any real difference
between a system that permits easy, secure, identity-based services
and a surveillance system?  Do you trust those who hold surveillance
data on you over the long haul by which I mean the indefinite
retention of transactional data between government services and
you, the individual required to proffer a non-fake-able identity
to engage in those transactions?  If you are building authentication
systems today, then you are playing in this league.

Standoff biometry by itself terminates the argument over whether
security and privacy are a zero sum game -- the sum is nowhere near
that good, and it is the surveilled who are capitalizing the system.
As with my game, entirely innocuous things become problematic when
surveilled.  Shoshana Zuboff, Harvard Business School Emerita,
called this "anticipatory conformity" and said:

    [W]e anticipate surveillance and we conform, and we do that with
    awareness. We know, for example, when we're going through the
    security line at the airport not to make jokes about terrorists
    or we'll get nailed, and nobody wants to get nailed for cracking
    a joke.  It's within our awareness to self-censor.  And that
    self-censorship represents a diminution of our freedom.  We
    self-censor not only to follow the rules, but also to avoid the
    shame of being publicly singled out.  Once anticipatory conformity
    becomes second nature, it becomes progressively easier for people
    to adapt to new impositions on their privacy, their freedoms.
    The habit has been set.

Leonard Downie, the former executive editor of The Washington Post,
wrote in that very paper on October 4th:

    Many reporters covering national security and government policy
    in Washington these days are taking precautions to keep their
    sources from becoming casualties in the Obama administration's
    war on leaks.  They and their remaining government sources often
    avoid telephone conversations and e-mail exchanges, arranging
    furtive one-on-one meetings instead.  A few news organizations
    have even set up separate computer networks and safe rooms for
    journalists trained in encryption and other ways to thwart
    surveillance.[3]

Once again, this is all about data and, to the exact point, about
fused data from many sources.  Do you like it?  Do you not like it?
All you engineers know that for the engineer, it is "fast, cheap,
reliable: choose two."  I am here to argue that for policy makers
working the cybersecurity beat, it is "freedom, security, convenience:
choose two."  But so long as policy makers in a democracy eventually
come around to the people's desires, my argument, such as it is,
is with the public at large, not with those who are trying to deliver
failure-proof protection to an impatient, risk-averse, gadget-addicted
population.

We learned in the financial crisis that there are levels of achievable
financial return that require levels of unsustainable financial
risk.  We learned that lesson on the large scale and on the small,
on the national scale and on the personal one.  I would like us to
not have to learn the parallel lesson with respect to data that
powers the good versus data that powers the bad.  If we can, for
the moment, think of data as a kind of money, then investing too
much our own data in an institution too big to influence is just
as insensate as investing too much of our own money in an institution
too big to fail.

I have become convinced that all security tools and all the data
that they acquire are, as they say in the military, dual use -- the
security tools and their data can be used for good or for ill.  I
am similarly convinced that the root cause, the wellspring of risk
is dependence, especially dependence on expectations of system
state.  If you would accept that you are most at risk from the
things you most depend upon, then damping dependence is the cheapest,
most straightforward, lowest latency way to damp risk.  This is,
in further analogy, just like the proven fact that the fastest and
most reliable way to put more money on the bottom line is through
cost control.  John Gilmore famously said, "Never give a government
a power you wouldn't want a despot to have."  I might amend that
to read "Never demand the government have a power you wouldn't want
a despot to have."

I have also become convinced that a state of security is one in
which there is no unmitigatable surprise, that is to say that you
have reached a state of security when you can mitigate the surprises
you will face.  Note that I did not say a state of security is the
absence of surprise, but rather the absence of unmitigatable surprise.
California Senate Bill 1386, the first of the state-level data
breach laws, did not criminalize losing credit card data; rather,
it prescribed the actions that a firm which has lost the credit
card data of its customers must take.  SB1386 is wise in that regard.

But only rarely do we ask our Legislatures to make mitigation
effective.  Instead, over and over again we ask our Legislatures
to make failure impossible.  When you embark on making failure
impossible, and that includes delivering on statements like "Never
again," you are forced into cost-benefit analyses where at least
one of the variables is infinite.  It is not heartless to say that
if every human life is actually priceless, then it follows that
there will never be enough money.  One is not anti-government to
say that doing a good job at preventing terrorism is better than
doing a perfect job.

And there is the Gordian Knot of this discussion: As society becomes
more technologic, even the mundane comes to depend on distant digital
perfection.  Our food pipeline contains less than a week's supply,
just to take one example, and that pipeline depends on digital
services for everything from GPS driven tractors to robot vegetable
sorting machinery to coast-to-coast logistics to RFID-tagged
livestock.  Is all the technologic dependency and the data that
fuels it making us more resilient or more fragile?

In cybersecurity practice, in which most of us here work, we seem
to be getting better and better.  We have better tools, we have
better understood practices, and we have more colleagues.  That's
the plus side.  But I'm interested in the ratio of skill to challenge,
and as far as I can estimate, we are expanding the society-wide
attack surface faster than we are expanding our collection of tools,
practices, and colleagues.  If you are growing more food, that's
great.  If your population is growing faster than your improvements
in food production can keep up, that's bad.  As with most decision
making under uncertainty, statistics have a role, particularly ratio
statistics that magnify trends so that the latency of feedback from
policy changes is more quickly clear.  Yet statistics, too, require
data.

In medicine, we have well established rules about medical privacy.
Those rules are helpful.  Those rules also have holes big enough
to drive a truck through.  Regardless, when you check into the
hospital there is an accountability-based, need-to-know regime that
governs your data most days.  However, if you check in with Bubonic
Plague or Anthrax, you will have zero privacy as those are mandatory
data reporting conditions.  So I ask you, would it make sense in a
public health of the Internet way to have a mandatory reporting
regime for cybersecurity failures?  Do you favor having to report
penetrations of your firm or household to the government or face
criminal charges for failing to make that report?  Is that data
that you want to share?  Sharing it can only harm you.  It might
help others.

This is not, in fact, about you personally.  Even Julian Assange,
in his book _Cypherpunks_, said "Individual targeting is not the
threat."  It is about a culture where personal data is increasingly
public data, and assembled en masse.  All we have to go on now is
the hopeful phrase "A reasonable expectation of privacy" but what
is reasonable when one inch block letters can be read from orbit?
What is reasonable when all of your financial or medical life is
digitized and available primarily over the Internet?  Do you want
ISPs to retain e-mails when you are asking your doctor a medical
question (or, for that matter, do you want those e-mails to become
part of your Electronic Health Record)?  Who owns your medical data
anyway?  Until the 1970s, it was the patient but regulations then
made it the provider.  With an Electronic Health Record, it is
likely to revert to patient ownership but if the EHR belongs to
you, do you get to surveil the use that is made of it by medical
providers and those that they outsource to?  And if not, why not?

Observability is fast extending to devices.  Some of it has already
appeared, such as the fact that any newish car is broadcasting four
unique Bluetooth radio IDs, one for each tire's valve stem.  Some
of it is in a daily progression, such as training our youngsters
to accept surveillance by stuffing a locator beacon in their backpack
as soon as they go off to Kindergarten.  Some of it is newly
technologic, like through the wall imaging, and some of it is simply
that we are now surrounded by cameras that we can't even see where
no one camera is important but they are important in the aggregate
when their data is fused.  Anything that has "wireless" in its name
creates an opportunity for traffic analysis.

In the days of radio, there was Sarnoff's Law, namely that the value
of a broadcast network was proportional to N, the number of listeners.
Then came packetized network communications and Metcalfe's Law,
that the value of a network was proportional to N squared, the
number of possible two-way conversations.  We are now in the era
of Reed's Law where the value of a network is proportional to the
number of groups that can form in it, that is to say 2 to the power
N.  Reed's Law is the new reality because it fits the age of social
networks.  In tune with my claim that everything is dual use, any
entity (such as a government) that can acquire the entirety of all
social media transactions learns nearly everything there is to
learn, and all in one place, and all courtesy of the participants
themselves.  The growth of social networks is a surveiller's dream
come true.

Total system complexity from a security person's point of view is
essentially just geometry.  Security is non-composable -- we can
get insecure results even when our systems are assembled from secure
components.  The more components, the less likely a secure result.
Might the same be said of data?  Of course it can -- search for the
term "reidentification" and you'll find that incomplete data, even
intentionally anonymized data, can be put together if there is
enough of it, and what is enough seems to be a lower hurdle every
year.  Put differently, if you share one fact each with ten different
people, how many of the ten have to be compromised before you are
exposed?

Howard Brin was the first to suggest that if you lose control over
what data is collected on you, the only freedom-preserving alternative
is that if everyone else does, too.  If the government or the
corporation can surveil you without asking, then the balance of
power is preserved when you can surveil them without asking.  Bruce
Schneier countered that preserving the balance of power doesn't
mean much if the effect of new information is non-linear, that is
to say if new information is the exponent in an equation, not one
more factor in a linear sum.[4]  Solving that debate requires you
have a strong opinion on what data fusion means operationally to
you, to others, to society.

There is some axiom of Nature at work here.  Decision making under
uncertainty is what we do in the small, and what policy makers do
in the large.  Uncertainty is partial information, so it is natural
to want information that is less partial.  We are closing in on
having more information than we can use.  The Intelligence Community
has felt the heat of too much information to handle for some time.
The business community is feeling it now insofar as it is far cheaper
to keep everything than it is to do careful selective deletion.
The individual is feeling pretty warm, too, as evidenced by something
as simple as how much they depend on the ability to search their
e-mail rather than folderizing it after reading.

I have amassed all the fortune I am going to amass.  I have raised
all the children I am going to raise.  I have made all the commitments
I am going to make.  I am old enough that I can opt out of many of
the corporate data collection schemes and live out the remainder
of my days unaffected by what I might be missing out on.  That those
corporations are agents of government data collection means that
for now I am opting out of some of that as well.  Anyone under 40
has no such option, or at least no such easy option.  Everything I
am talking about here is a young person's problem, just like the
National Debt, which the young will soon inherit.  It is your choice
and responsibility whether to demand protections and conveniences
and services that can only be done with pervasive data.  It is your
choice and responsibility whether to fear only fear itself or to
fear the absence of fear.  It is your choice and responsibility to
be part of the problem or part of the solution.

Any finite tolerance for risk caps the amount of information you
will want in play.  This has nothing whatsoever to do with whether
you have anything to hide, and therefore it is your choice and
responsibility to make it understood that just as "..there is nothing
sinister in so arranging one's affairs as to [minimize] taxes"[5]
neither is there anything sinister in minimizing the data collectible
from you.  The price of freedom is the probability of crime.  But
as technology progresses, your choice will not be between Big Brother
or no Big Brother, rather it is already between one Big Brother and
lots of Little Brothers.  Think carefully, yours is the last
generation that will have a choice.


As Dylan Thomas wrote, "Do not go gentle into that good night//
Rage, rage against the dying of the light."

Thank you for hearing me out.



--------------

[1] "Professionalizing the Nation's Cyber Workforce?"
www.nap.edu/openbook.php?record_id=18446

[2] "Fingerprint ID May Mean You Can't 'Take the Fifth'," Marcia Hofmann
www.wired.com/opinion/2013/09/the-unexpected-result-of-fingerprint-authentication-that-you-cant-take-the-fifth

[3] "In Obama's War on Leaks, Reporters Fight Back," Leonard Downie
www.washingtonpost.com/opinions/in-obamas-war-on-leaks-reporters-fight-b
ack/2013/10/04/70231e1c-2aeb-11e3-b139-029811dbb57f_print.html

[4a] "The Myth of the 'Transparent Society'," Bruce Schneier
www.wired.com/politics/security/commentary/securitymatters/2008/03/securitymatters_0306
[4b] "Rebuttal," David Brin
www.wired.com/politics/security/news/2008/03/brin_rebuttal

[5] Judge Learned Hand, COMMISSIONER V. NEWMAN, 159 F.2D 848, 850-851
(CA2 1947): "Over and over again, the courts have said there is
nothing sinister in so arranging one's affairs as to keep taxes as
low as possible.  Everybody does so, rich and poor, and all do
right, for nobody owes any duty to pay more tax than the law demands.
Taxes are enforced exactions, not voluntary contributions.  To
demand more in the name of morals is mere cant."

---
end

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>> The major NIST crypto standards are the result of solicitations that are open to the world, at least
>> in the recent past.AES was developed by two Belgians. SHA-3 is the result of work more Belgians.
>> Should we infer that NSA co-opted theseBelgian crypto experts?
> Rijndael was accepted unchanged as AES.  Thats why as part of everything, people still trust it.
>
> Keccak however, is being mysteriously changed in the SHA-3 process, which is not inspiring confidence in the process:
>
> https://www.schneier.com/blog/archives/2013/10/will_keccak_sha-3.html
>

I read Bruces's post at the cited URL. The developers of the alg replied:

    EDITED TO ADD (10/5): It's worth reading the response from the
    Keccak team on this issue.
    I misspoke when I wrote that NIST made "internal changes" to the
    algorithm. That was sloppy of me.
    The Keccak permutation remains unchanged. What NIST proposed was
    reducing the hash function's capacity
    in the name of performance. One of Keccak's nice features is that
    it's highly tunable.

    I do not believe that the NIST changes were suggested by the NSA.
    Nor do I believe that the changes
    make the algorithm easier to break by the NSA. I believe NIST made
    the changes in good faith, and
    the result is a better security/performance trade-off. My problem
    with the changes isn't cryptographic,
    it's perceptual. There is so little trust in the NSA right now, and
    that mistrust is reflecting on NIST.
    I worry that the changed algorithm won't be accepted by an
    understandably skeptical security community, and that no one will
    use SHA-3 as a result.


That does not seem consistent with "mysteriously changed."

Steve

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    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    <br>
    <blockquote
      cite="mid:21D6C0EE-0C10-4DC9-ADD6-A6CFA212D163@icsi.berkeley.edu"
      type="cite">
      <blockquote type="cite">
        <pre wrap="">The major NIST crypto standards are the result of solicitations that are open to the world, at least
in the recent past.AES was developed by two Belgians. SHA-3 is the result of work more Belgians.
Should we infer that NSA co-opted theseBelgian crypto experts?
</pre>
      </blockquote>
      <pre wrap="">
Rijndael was accepted unchanged as AES.  Thats why as part of everything, people still trust it.

Keccak however, is being mysteriously changed in the SHA-3 process, which is not inspiring confidence in the process:

<a class="moz-txt-link-freetext" href="https://www.schneier.com/blog/archives/2013/10/will_keccak_sha-3.html">https://www.schneier.com/blog/archives/2013/10/will_keccak_sha-3.html</a>

</pre>
    </blockquote>
    <br>
    I read Bruces's post at the cited URL. The developers of the alg
    replied:<br>
    <br>
    <blockquote>EDITED TO ADD (10/5): It's worth reading the response
      from the Keccak team on this issue.<br>
      I misspoke when I wrote that NIST made "internal changes" to the
      algorithm. That was sloppy of me. <br>
      The Keccak permutation remains unchanged. What NIST proposed was
      reducing the hash function's capacity <br>
      in the name of performance. One of Keccak's nice features is that
      it's highly tunable.<br>
      <br>
      I do not believe that the NIST changes were suggested by the NSA.
      Nor do I believe that the changes <br>
      make the algorithm easier to break by the NSA. I believe NIST made
      the changes in good faith, and <br>
      the result is a better security/performance trade-off. My problem
      with the changes isn't cryptographic, <br>
      it's perceptual. There is so little trust in the NSA right now,
      and that mistrust is reflecting on NIST. <br>
      I worry that the changed algorithm won't be accepted by an
      understandably skeptical security community, and that no one will
      use SHA-3 as a result.<br>
    </blockquote>
    <br>
    That does not seem consistent with "mysteriously changed." <br>
    <br>
    Steve<br>
  </body>
</html>

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A subpoena in this context is one of the
multiple instantiations of "lawful authorization."
The exact form varies in different jurisdictions
pursuant to the statutory or administrative law
being employed.

The force and effect derives from the fact
that the entity receiving the lawful authorization
and refuses will befall one of the following
adverse effects: loss of business authorization,
loss of equipment/software approval, fine, or
imprisonment.

The global requirements that are implemented
with minor modifications in essentially every
nation can be found here.  Those implementations
have multiple sub-categories depending on whether
the handovers are real-time or not, and whether
content or metainformation/signalling is being
provided.

http://www.etsi.org/deliver/etsi_ts/101300_101399/101331/01.03.01_60/ts_101331v010301p.pdf

Vendors and service providers build
and operate devices and services to
be compliant.  The encryption controls
can be found at Sec. 4.3.

The underlying international law supporting
these requirements has a long and extensive
history dating back to 1850.

Hope this helps.

-t


On 10/23/2013 4:10 AM, Yoav Nir wrote:
> So do I, and AFAIK it can compel you to come and testify, or to hand over some documents. I don't think it can be used to force a CA to sign a certificate request or for whoever to register bad keys in the DNS.
>
> Not saying a national government can't do either of these things, but not with a subpoena.


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On 10/23/2013 10:43 AM, Stephen Kent wrote:
> The major NIST crypto standards are the result of solicitations that are
> open to the world, at least
> in the recent past.AES was developed by two Belgians. SHA-3 is the
> result of work more Belgians.
> Should we infer that NSA co-opted theseBelgian crypto experts?

Since I've never participated in those processes, but did assume that 
the major benefit of open review would be assurance of 'valid' 
operation, I'm left with the conclusion that the compromised algorithms 
did not receive sufficiently diligent review.

Or is there some other aspect of the technology or process that would 
account for the cited algorithm weakness' slipping through?


> I think it is appropriate to focus on specific NIST crypto standards
> that may have been inappropriately influenced,
> rather than assuming that every NIST crypto standard is suspect. So far,
> the only NIST crypto standard I've seen for
> which there appears to be an objectively-justified concern is the PRNG
> based on ECC.

This presumes that we/the-public know the full list of inappropriately 
influenced work and that there is a way of detecting inappropriate 
influence on future work.

Since such monitoring and alerting failed in the past, what will ensure 
its succeeding in the future?

d/
-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

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Date: Wed, 23 Oct 2013 12:51:07 -0400
Message-ID: <CAB5WduA7iAyqOeiMAkiRoHg=AT3D0WEZap_X+H4iVkVauSRy9g@mail.gmail.com>
From: DataPacRat <datapacrat@gmail.com>
To: Paul Wouters <paul@cypherpunks.ca>
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Subject: Re: [perpass] Web-of-trust CAs
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On Wed, Oct 23, 2013 at 11:22 AM, Paul Wouters <paul@cypherpunks.ca> wrote:
> On Wed, 23 Oct 2013, DataPacRat wrote:

>> My general thought, as of the start of this thread, is that such
>> attacks could be made much harder to implement and much less effective
>> by massively increasing the number of CAs (essentially, by turning
>> everyone into a CA).
>
> That's basically what DANE does. Everyone becomes their own CA within
> their own domain, by securely (DNSSEC) publishing TLS public keys.

> The only defense against a "subpoena attack" is not outsourcing your
> end to end encryption. That's what we need to facilitate.

I think I see a differing assumption between DANE and RPKI, and the
model I'm using. Both of those security systems seem to be aimed at
provably linking a domain name with a particular server, so that when
you go to 'gmail.com' you're not secretly being redirected to some
other server which decrypts your private email. But if no domain name
is involved, neither of those systems applies.

I'm thinking of a different layer of security: the end-user, rather
than their ISP. While many companies and some people run their own
domain names, an increasing number of people don't even bother having
email addresses anymore - they have accounts at an ever-shifting
collection of social media sites, each of which has different
capabilities, each of which uses different security procedures.
Proving that the tweets sent by @DataPacRat are from the same person
as the posts of facebook.com/DataPacRat, and both are sent by someone
posting to an otherwise-anonymized Tor-based bulletin board, seems, to
me, to be a related but slightly different problem than securing
twitter.com and facebook.com themselves.

Put another way - I'm trying to find a security solution that includes
sites with URIs resembling randomstring.onion , as well as whatever
random pseudo-URIs will have been invented in five to ten years. With
luck, such a solution will be broad enough to cover more ordinary
internet usage, as well. As .onion addresses don't use the DNS system,
DNS-based security systems aren't quite general enough for what I'm
hoping to aim for. A highly distributed CA-like system /might/ be
broad enough to do the trick (not to mention many other tricks); it's
possible I'll have to look somewhere else, or even that it's not a
soluble problem.

There don't seem to be many people thinking in this direction, so I'm
doing what I can to figure out as much as I can, in case I manage to
collect enough ideas to assemble into a useful new pattern. Signed
vCards seem as if they'd be a handy tool to build any such solution
on, as they allow for keys to be asserted as being linked to arbitrary
ID strings (including any given URI or pseudo-URI). Working out a
system for easy use, exchange, and storage of Signed vCards is...
still an open problem. Since enduser-to-enduser security would help
reduce pervasive passive monitoring, and I've started getting a better
handle on IETF mailing lists and working groups, I've brought up the
idea here, in hopes of evoking as many potentially useful ideas as I
can.

I'm all too aware that this logic chain may have fallen off the rails
at just about any point in the above-described thought processes, so
I'm also trying to keep an eye out for any alternative approaches that
can handle non-DNS-based identifiers.


We now return you to your regularly scheduled mailing list.


Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From scott.brim@gmail.com  Wed Oct 23 10:08:55 2013
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From: Scott Brim <scott.brim@gmail.com>
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--001a11c207f009049404e96b9276
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This is fantastic.  Thanks.

It illumines something: Surveillance by governments is not the biggest of
our problems. Privacy in the ordinary operation of a technology-based
society is significantly bigger. Criminals, big business ... but also
businesses and casual individuals have access to data you wish they didn't.
Yes the IETF needs to do better with crypto and authentication, but the
fundamental designs of the protocols they are being added to need to
support them.  From the bottom up, we need to proactively (not reactively)
make sure that IETF protocol designs take privacy into consideration.

Scott

--001a11c207f009049404e96b9276
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<div dir=3D"ltr"><div class=3D"gmail_extra">This is fantastic. =A0Thanks.</=
div><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">It illu=
mines something: Surveillance by governments is not the biggest of our prob=
lems. Privacy in the ordinary operation of a technology-based society is si=
gnificantly bigger. Criminals, big business ... but also businesses and cas=
ual individuals have access to data you wish they didn&#39;t. Yes the IETF =
needs to do better with crypto and authentication, but the fundamental desi=
gns of the protocols they are being added to need to support them. =A0From =
the bottom up, we need to proactively (not reactively) make sure that IETF =
protocol designs take privacy into consideration.=A0</div>

<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">Scott</div>=
</div>

--001a11c207f009049404e96b9276--

From kent@bbn.com  Wed Oct 23 10:19:06 2013
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Subject: Re: [perpass] Standards in the age of pervasive suspicion
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Dave,

The one NIST standard that has been identified as suspect did not follow 
the open solicitation
and review processes to which I alluded.

Steve

From kent@bbn.com  Wed Oct 23 10:21:28 2013
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Subject: Re: [perpass] Web-of-trust CAs
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DataPacRat,
> ...
> I think I see a differing assumption between DANE and RPKI, and the
> model I'm using. Both of those security systems seem to be aimed at
> provably linking a domain name with a particular server, so that when
> you go to 'gmail.com' you're not secretly being redirected to some
> other server which decrypts your private email. But if no domain name
> is involved, neither of those systems applies.
This is not true of the RPKI. The RPKI was developed to support
routing security, not binding public keys to DNS names.

Steve

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Subject: Re: [perpass] Standards in the age of pervasive suspicion
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On 10/23/2013 1:18 PM, Stephen Kent wrote:
> Dave,
>
> The one NIST standard that has been identified as suspect did not follow
> the open solicitation
> and review processes to which I alluded.


Thanks for the clarification; I had obviously missed that rather basic 
point.

A consequence of having /any/ occurrence of undue influence is that it 
tends to prompt a broader concern about the entire process.  Doesn't 
matter whether it should; it does.  The brand is tainted.

So it would probably be helpful for (re-)establishing trust in the 
typical, open NIST process to formulate some sort of affirmative 
analysis of its quality assurances practices and track-record, with a 
specific eye on its prevention of inappropriate influence.

At one level, it's inherent in saying "open", but the details of actual 
practice -- in particular a track record of aggressive and independent 
multi-participant critical review -- would give flesh to the bones of 
saying "open".

d/


-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

From envite@rolamasao.org  Wed Oct 23 11:13:49 2013
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Subject: [perpass] e-mail security idea: server2server PGP
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Hi all

I think it would be possible, and even easy for the developers, to 
program an extension to SMTP in which servers use OpenPGP among them, 
independently of any TLS/SSL usage.

Why: It helps stopping spam because the receiver server can trust the 
identity of the sender, and it helps avoiding wiretapping.

This idea I have developed does not help with the Government asking the 
mail provider directly for the e-mail contents, but helps with 
eavesdropping and also with spam, as I said.

Are you interested in reading about it?

Regards

Noel Torres
er Envite

From paul@cypherpunks.ca  Wed Oct 23 11:18:15 2013
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On Wed, 23 Oct 2013, Noel Torres wrote:

> I think it would be possible, and even easy for the developers, to program an 
> extension to SMTP in which servers use OpenPGP among them, independently of 
> any TLS/SSL usage.

That's the point of:

http://tools.ietf.org/html/draft-wouters-dane-openpgp-01

It allows the mail client, or MUA, or MTA, to encrypt a message
during transport.

Commenting on the draft in one of the IETF lists (openpgp, dane or here)
would be useful to show support for this moving forward.

A sendmail/postfix milter implementation is planned.

Paul

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On 10/23/2013 2:13 PM, Noel Torres wrote:
> I think it would be possible, and even easy for the developers, to
> program an extension to SMTP in which servers use OpenPGP among them,
> independently of any TLS/SSL usage.
>
> Why: It helps stopping spam because the receiver server can trust the
> identity of the sender, and it helps avoiding wiretapping.



Please explain it's superiority over DKIM and SPF and DMARC.

d/


-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

From datapacrat@gmail.com  Wed Oct 23 11:25:45 2013
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On Wed, Oct 23, 2013 at 1:21 PM, Stephen Kent <kent@bbn.com> wrote:
> DataPacRat,

>> I think I see a differing assumption between DANE and RPKI, and the
>> model I'm using. Both of those security systems seem to be aimed at
>> provably linking a domain name with a particular server, so that when
>> you go to 'gmail.com' you're not secretly being redirected to some
>> other server which decrypts your private email. But if no domain name
>> is involved, neither of those systems applies.
>
> This is not true of the RPKI. The RPKI was developed to support
> routing security, not binding public keys to DNS names.

My mistake; my apologies.



Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From jmg@h2.funkthat.com  Wed Oct 23 11:28:19 2013
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Date: Wed, 23 Oct 2013 11:28:04 -0700
From: John-Mark Gurney <jmg@funkthat.com>
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Is it just me, or is it funny that we are talking about securing the
inet, yet the ietf apparently doesn't do STARTTLS when sending email?
and hence the perpass email list is sent out unencrypted...

Guess I'll drop a note to postmaster@ietf.com.

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."

From ned+perpass@mrochek.com  Wed Oct 23 11:29:16 2013
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To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Cc: perpass <perpass@ietf.org>, Stephen Kent <kent@bbn.com>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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> On 10/16/2013 03:28 PM, Stephen Kent wrote:
> > Stephen,
> >
> > Just commenting on one of your comments ...
> >> ...
> >>> What is this "cleartext IMAP" of which you speak?
> >> I guess that's a fair comment - we don't know that they're
> >> able gather to inbox data via IMAP due to it being sent in
> >> clear,  however that seems like a reasonable guess based
> >> on the newspaper story which says that collection is done
> >> by telcos that are "overseas" and assuming that TLS is not
> >> busted for these services.
> > Based only on the story that you cited, and your observation about
> > telcos being the sources of the info, might it be the case that the
> > telcos were also the mail providers? I'm not sure how to interpret
> > the slides the the cite story included. That sort of explanation
> > would be consistent with Ned's observations about commercial provider
> > use of SSL to protect IMAP/POP access.

> That could be but I guess we're not likely to be told;-)

> I did take a peek to see if I could figure out if there're
> lots of services running on 143 without STARTTLS but haven't
> found anything that answers that question. I did find
> this [1] (no idea how accurate though) which says their
> survey found 4.7M listeners on 143, but there's no info
> about how many have a usable STARTTLS config.

But more to the point, the same study found 3.9M listeners on port 993. And
these days most clients try 993 first and only then fall back to port 143.
Assuming that everyone offering port 993 also offers 143, this would indicate
that at least 83% of IMAP servers out there are capable of being used in a
secure fashion. Which I have to say is a lot better than I expected.

But as I indicated previously, when it comes to addressing pervasive
surveilance of large numbers of users, even if we restrict ourselves to the
IMAP space this sort of survey is completely meaningless because if fails to
take the number of users on a server into account. My home server, with its
whopping total of 3 IMAP users is almost certainly on that list under two IPs,
and so is another server I know of, also under just two IPs, that hosts around
100 million users.

According to The Radicati Group, the ISP/MSP space is dominated by software
produced by folks like Critical Path (Intermail), Openwave Messaging, and yes,
Oracle (Oracle CMES). Now take a look at where these products rank on the
list you cite.

Like it or not, the email world is hugely lopsided and getting even more so as
an increasing number of small ISPs and enterprises migrate to hosted
solutions in the cloud. This growing concentration is both a curse and a
blessing: On the one hand, it means that a single exposure, like the fact that
Yahoo's webmail doesn't offer SSL/TLS even as an option (and is almost
certainly a major source of the information collection we're talking about
here). But on the other hand, when Yahoo implements SSL/TLS on their web mail,
as they have now said they are going to do in 2014, a major exposure will be
blocked.

Now think what a benefit it would be if SMTP traffic between Gmail, Apple, and
Yahoo was all done over encrypted links.

> With that
> number of services, I guess collecting O(10^5) "inboxes"
> per day in plaintext could be credible, but who knows.

That number is credible coming just from Yahoo web mail, which we know is wide
open and which we know they were collecting because it's referenced directly on
the slides. You *really* need to start thinking on a larger scale here.

Some additional information about the state of web mail showed up in
SANS Newsbites the other day:

  --Yahoo Webmail Gets Default SSL Protection in January
  (October 14, 2013)
  Yahoo has announced that starting on January 8, 2014, all Yahoo mail
  will be protected by SSL by default. Microsoft has offered optional SSL
  protection since 2010 and it has been default for Microsoft webmail
  since July 2012. Facebook implemented SSL for all connections several
  months ago; it has been an option since 2011. Twitter offered it as an
  option at the beginning on 2011 and made it default by August of that
  year. Google has had SSL on by default since 2010, an option since 2008.
  Yahoo began offering the option of SSL encryption earlier this year.
  http://www.washingtonpost.com/blogs/the-switch/wp/2013/10/14/yahoo-to-make-ssl-encryption-the-default-for-webmail-users-finally/
  http://news.cnet.com/8301-1009_3-57607486-83/yahoo-mail-finally-turns-on-ssl/
  http://www.theregister.co.uk/2013/10/15/yahoo_mail_encryption_by_default_in_2014/

> But, nonetheless I think the question about 3-flavours
> of IMAP and MTI is still worth thinking about.

Not along the lines you seem to be considering.

				Ned

From joe@cdt.org  Wed Oct 23 11:31:20 2013
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Subject: Re: [perpass] Standards in the age of pervasive suspicion
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256



On 10/23/13 11:31 AM, Stephen Kent wrote:
> 
> 
> I read Bruces's post at the cited URL. The developers of the alg
> replied:
> 
> That does not seem consistent with "mysteriously changed."

It is consistent... the process from a winning cryptographic algorithm
to NIST FIPS standardization is pretty murky, and if you follow the
hash-forum list at NIST, you'd see a lot of hue and cry about the
reduction in capacity of Keccak. Of course, now that the Keccak team
has weighed in, it appears that the eventual SHA-3 FIPS standard will
include one or more high-security modes.

NIST appears to have learned from this that the standardization
process has to be equally as transparent as the
competition/cryptanalysis process. That's a very good thing.

best, Joe

- -- 
Joseph Lorenzo Hall
Chief Technologist
Center for Democracy & Technology
1634 I ST NW STE 1100
Washington DC 20006-4011
(p) 202-407-8825
(f) 202-637-0968
joe@cdt.org
PGP: https://josephhall.org/gpg-key
fingerprint: BE7E A889 7742 8773 301B 4FA1 C0E2 6D90 F257 77F8


-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.13 (Darwin)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iEYEAREIAAYFAlJoFfAACgkQwOJtkPJXd/gbPgCeJfMqOD+LE6JyxEiv5T1Pzr3J
sv8AoIKcHCx6Ph3YAdUnYIkGBI0i4Kl0
=Xecl
-----END PGP SIGNATURE-----


From envite@rolamasao.org  Wed Oct 23 11:34:51 2013
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Subject: Re: [perpass] e-mail security idea: server2server PGP
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On 23/10/13 19:18, Dave Crocker wrote:
> On 10/23/2013 2:13 PM, Noel Torres wrote:
>> I think it would be possible, and even easy for the developers, to
>> program an extension to SMTP in which servers use OpenPGP among them,
>> independently of any TLS/SSL usage.
>>
>> Why: It helps stopping spam because the receiver server can trust the
>> identity of the sender, and it helps avoiding wiretapping.
>
>
>
> Please explain it's superiority over DKIM and SPF and DMARC.
>
> d/
>
>
Hi Dave

In short, DKIM does not avoid wiretapping on itself, SPF does not, 
either, nor DMARC.

My idea is that server2server communication is signed and ecrypted using 
OpenPGP (which can be done on the fly without great changes to current 
Internet structure). e-mails with bad server signature will be rejected 
before they are transmitted, so we save bandwidth.

Servers will trust other server signatures on a "configured by the 
administrator" basis, so Alice, as Admin of Alice.com, chooses to trust 
Bob.com's key to sign Charles.com key as valid, like in the standard GPG 
Web of Trust. Keys that are not specifically accepted nor signed by a 
trusted party, will cause e-mail to be accepted but marked as 
non-trustable (maybe directly as spam).

I have also developed how it could work on the wire, with a simple 
extension to current SMTP.

Regards

Noel
er Envite

From dhc@dcrocker.net  Wed Oct 23 11:45:36 2013
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On 10/23/2013 2:34 PM, Noel Torres wrote:
> On 23/10/13 19:18, Dave Crocker wrote:
>> On 10/23/2013 2:13 PM, Noel Torres wrote:
>>> I think it would be possible, and even easy for the developers, to
>>> program an extension to SMTP in which servers use OpenPGP among them,
>>> independently of any TLS/SSL usage.
>>>
>>> Why: It helps stopping spam because the receiver server can trust the
>>> identity of the sender, and it helps avoiding wiretapping.
>>
>>
>>
>> Please explain it's superiority over DKIM and SPF and DMARC.
>>
>> d/
>>
>>
> Hi Dave
>
> In short, DKIM does not avoid wiretapping on itself, SPF does not,
> either, nor DMARC.


You cited the benefit you are seeking as trusting who the 'sender' was. 
  That's an authentication/signature task, not a 
confidentiality/encryption task.


d/

ps. the mere fact of authentication does not vet the trustworthiness of 
the validated identity.


-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

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On 23/10/13 19:44, Dave Crocker wrote:
[...]
 >
 > You cited the benefit you are seeking as trusting who the 'sender' was.
 >   That's an authentication/signature task, not a
 > confidentiality/encryption task.
 >
Hi Dave

I said that my idea would achieve both authentication and confidentiality.
 >
 > d/
 >
 > ps. the mere fact of authentication does not vet the trustworthiness of
 > the validated identity.
 >
It depends on the configuration and contents of the Web of Trust.

Regards

Noel
er Envite

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On 10/23/13 11:28 AM, John-Mark Gurney wrote:
> Is it just me, or is it funny that we are talking about securing the
> inet, yet the ietf apparently doesn't do STARTTLS when sending email?
> and hence the perpass email list is sent out unencrypted...
>
> Guess I'll drop a note to postmaster@ietf.com.
>
It's not just you.  IETF SHOULD be using STARTTLS for email, not
particularly for this or other mailing lists (where attackers could just
read the archives, anyway) but because it's the Right Thing To Do.

-Jim

From jmg@h2.funkthat.com  Wed Oct 23 12:14:02 2013
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Date: Wed, 23 Oct 2013 12:13:51 -0700
From: John-Mark Gurney <jmg@funkthat.com>
To: Noel Torres <envite@rolamasao.org>
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Subject: Re: [perpass] e-mail security idea: server2server PGP
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Noel Torres wrote this message on Wed, Oct 23, 2013 at 19:34 +0100:
> On 23/10/13 19:18, Dave Crocker wrote:
> >On 10/23/2013 2:13 PM, Noel Torres wrote:
> >>I think it would be possible, and even easy for the developers, to
> >>program an extension to SMTP in which servers use OpenPGP among them,
> >>independently of any TLS/SSL usage.
> >>
> >>Why: It helps stopping spam because the receiver server can trust the
> >>identity of the sender, and it helps avoiding wiretapping.
> >
> >
> >
> >Please explain it's superiority over DKIM and SPF and DMARC.
> >
> >d/
> >
> >
> Hi Dave
> 
> In short, DKIM does not avoid wiretapping on itself, SPF does not, 
> either, nor DMARC.

Except that we already have STARTTLS... How is this better than
DKIM/SPF/DMARC and STARTTLS?

And don't say it means that spam will be encrypted, because you (and the
spammer) don't care about encryption of a spam message, and any real
email (w/ a valid DKIM, etc) will be sent wrapped in STARTTLS...

And the advantage of STARTTLS is that it only now needs simple
configuration as opposed to having to install a new milter and gpg,
etc...

This doesn't prevent MITM attacks, but w/ DNSSEC + DANE, it could be
addressed...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."

From mcr@sandelman.ca  Wed Oct 23 11:24:10 2013
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Noel Torres <envite@rolamasao.org> wrote:
    > I think it would be possible, and even easy for the developers, to program an
    > extension to SMTP in which servers use OpenPGP among them, independently of
    > any TLS/SSL usage.

    > Why: It helps stopping spam because the receiver server can trust the
    > identity of the sender, and it helps avoiding wiretapping.

No, it doesn't, because you are assuming some kind of trust model which does
not exist.

DKIM can already sign emails, and it's the signing that adds trust for the
sender.

There have been PGP encrypting sendmail plugins for years (decades?)... the
problem is finding and trusting the keys.

-- 
]               Never tell me the odds!                 | ipv6 mesh networks [ 
]   Michael Richardson, Sandelman Software Works        | network architect  [ 
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [ 
	

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On 10/23/2013 08:09 PM, Jim Fenton wrote:
> On 10/23/13 11:28 AM, John-Mark Gurney wrote:
>> Is it just me, or is it funny that we are talking about securing the
>> inet, yet the ietf apparently doesn't do STARTTLS when sending email?
>> and hence the perpass email list is sent out unencrypted...
>>
>> Guess I'll drop a note to postmaster@ietf.com.
>>
> It's not just you.  IETF SHOULD be using STARTTLS for email, not
> particularly for this or other mailing lists (where attackers could just
> read the archives, anyway) but because it's the Right Thing To Do.

That was discussed in the DANE meeting in Berlin and
there's a plan for eating our own dogfood, but I'm
not sure where its at. Will check.

S.

> 
> -Jim
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

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On Oct 23, 2013, at 11:44 AM, Dave Crocker <dhc@dcrocker.net> wrote:

> On 10/23/2013 2:34 PM, Noel Torres wrote:
>> On 23/10/13 19:18, Dave Crocker wrote:
>>> On 10/23/2013 2:13 PM, Noel Torres wrote:
>>>> I think it would be possible, and even easy for the developers, to
>>>> program an extension to SMTP in which servers use OpenPGP among =
them,
>>>> independently of any TLS/SSL usage.
>>>>=20
>>>> Why: It helps stopping spam because the receiver server can trust =
the
>>>> identity of the sender, and it helps avoiding wiretapping.
>>>=20
>>> Please explain it's superiority over DKIM and SPF and DMARC.
>>>=20
>>> d/
>>>=20
>> Hi Dave
>>=20
>> In short, DKIM does not avoid wiretapping on itself, SPF does not,
>> either, nor DMARC.
>=20
> You cited the benefit you are seeking as trusting who the 'sender' =
was.  That's an authentication/signature task, not a =
confidentiality/encryption task.
>=20
> d/
>=20
> ps. the mere fact of authentication does not vet the trustworthiness =
of the validated identity.

Dear Dave,

As you know, DKIM can not authenticate the sender.  DKIM authenticates =
some unseen domain signed a portion of the message.  DKIM does not =
confirm the signing domain intended to send the message to the recipient =
either.  Nor does DKIM ensure valid message structure where acceptance =
on the basis of trusted DKIM signatures can be hazardous, contrary to =
the process described in the DKIM deployment RFC.  In addition, because =
DKIM can not authenticate the sender, it can never abate email abuse =
either, nor was that ever described as a supported feature.

StartTLS is not affected by message structure and indicates the intended =
recipient as well as identifying an accountable sender. StartTLS offers =
a safe basis for trust, reputation, and acceptance.  DKIM in conjunction =
with DMARC has very limited applicability and only prevents =46rom =
header field spoofing but even then allows click-able links to be =
injected into a spoofed Subject header field.

Regards,
Douglas Otis

ps. DKIM authentication does not vet the message nor the trustworthiness =
of the signing domain.  DKIM does not validate any identity either.



From jmg@h2.funkthat.com  Wed Oct 23 13:02:47 2013
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Date: Wed, 23 Oct 2013 13:02:27 -0700
From: John-Mark Gurney <jmg@funkthat.com>
To: Douglas Otis <doug.mtview@gmail.com>
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Cc: Noel Torres <envite@rolamasao.org>, Dave Crocker <dcrocker@bbiw.net>, perpass@ietf.org
Subject: Re: [perpass] e-mail security idea: server2server PGP
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Douglas Otis wrote this message on Wed, Oct 23, 2013 at 12:47 -0700:
> On Oct 23, 2013, at 11:44 AM, Dave Crocker <dhc@dcrocker.net> wrote:
> 
> > On 10/23/2013 2:34 PM, Noel Torres wrote:
> >> On 23/10/13 19:18, Dave Crocker wrote:
> >>> On 10/23/2013 2:13 PM, Noel Torres wrote:
> >>>> I think it would be possible, and even easy for the developers, to
> >>>> program an extension to SMTP in which servers use OpenPGP among them,
> >>>> independently of any TLS/SSL usage.
> >>>> 
> >>>> Why: It helps stopping spam because the receiver server can trust the
> >>>> identity of the sender, and it helps avoiding wiretapping.
> >>> 
> >>> Please explain it's superiority over DKIM and SPF and DMARC.
> >>> 
> >>> d/
> >>> 
> >> Hi Dave
> >> 
> >> In short, DKIM does not avoid wiretapping on itself, SPF does not,
> >> either, nor DMARC.
> > 
> > You cited the benefit you are seeking as trusting who the 'sender' was.  That's an authentication/signature task, not a confidentiality/encryption task.
> > 
> > d/
> > 
> > ps. the mere fact of authentication does not vet the trustworthiness of the validated identity.
> 
> Dear Dave,
> 
> As you know, DKIM can not authenticate the sender.  DKIM authenticates some unseen domain signed a portion of the message.  DKIM does not confirm the signing domain intended to send the message to the recipient either.  Nor does DKIM ensure valid message structure where acceptance on the basis of trusted DKIM signatures can be hazardous, contrary to the process described in the DKIM deployment RFC.  In addition, because DKIM can not authenticate the sender, it can never abate email abuse either, nor was that ever described as a supported feature.

What is your definition of sender?  The sender can be many different
entities in this context.. I can be the relay, it could be the domain's
email server or it could be the end user...

>From my understanding, DKIM is basicly a statement from a responsible
domain, that I have done my best to validate that this is a legitimate
email and I don't relay for untrusted people, etc...

> StartTLS is not affected by message structure and indicates the intended recipient as well as identifying an accountable sender. StartTLS offers a safe basis for trust, reputation, and acceptance.  DKIM in conjunction with DMARC has very limited applicability and only prevents From header field spoofing but even then allows click-able links to be injected into a spoofed Subject header field.

Maybe I'm missing something, but I'm not sure how STARTTLS (plus presuably
w/ DANE) can authenticate that the client is the sender?  I might be
missing the RFC/standard/etc. that allows server to auth the client cert..

In most cases I've seen, it's only the client/relay authenticating server..

> ps. DKIM authentication does not vet the message nor the trustworthiness of the signing domain.  DKIM does not validate any identity either.

As far as my understanding, nor does STARTTLS...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."

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On 10/23/2013 4:02 PM, John-Mark Gurney wrote:
> What is your definition of sender?  The sender can be many different
> entities in this context.. I can be the relay, it could be the domain's
> email server or it could be the end user...


Please terminate this sub-thread.  It has many years of wasted history 
on many mailing lists.

Really.  The script this thread will follow has been run so many times, 
the pages are tattered.

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

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--089e0118293ae92a4104e96ea8c5
Content-Type: text/plain; charset=ISO-8859-1

Just to clarify, I was not suggesting that anyone in the WG is an NSA mole.

The model I had in mind was more one where someone on the classified side
decides that a certain proposal would close a zero day vulnerability that
they plan to exploit. A plausible argument is then constructed as to why
this would be a bad idea and this is farmed out to people who cross the
internal/external line without an explanation as to why.

If you read Sun Tsu, this is the bit about the unknowing spy.


My point was that I think we have to be a lot more careful about arguments
that end up leaving the Internet insecure.

--089e0118293ae92a4104e96ea8c5
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">Just to clarify, I was not suggesting that anyone in the W=
G is an NSA mole.<div><br></div><div>The model I had in mind was more one w=
here someone on the classified side decides that a certain proposal would c=
lose a zero day vulnerability that they plan to exploit. A plausible argume=
nt is then constructed as to why this would be a bad idea and this is farme=
d out to people who cross the internal/external line without an explanation=
 as to why.=A0</div>
<div><br></div><div>If you read Sun Tsu, this is the bit about the unknowin=
g spy.</div><div><br></div><div><br></div><div>My point was that I think we=
 have to be a lot more careful about arguments that end up leaving the Inte=
rnet insecure.=A0</div>
<div><br></div><div><br></div></div>

--089e0118293ae92a4104e96ea8c5--

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Dear John-Mark,

Good Questions.  See brief comments inline.

On Oct 23, 2013, at 1:02 PM, John-Mark Gurney <jmg@funkthat.com> wrote:

> Douglas Otis wrote this message on Wed, Oct 23, 2013 at 12:47 -0700:
>> On Oct 23, 2013, at 11:44 AM, Dave Crocker <dhc@dcrocker.net> wrote:
>>=20
>>> On 10/23/2013 2:34 PM, Noel Torres wrote:
>>>> On 23/10/13 19:18, Dave Crocker wrote:
>>>>> On 10/23/2013 2:13 PM, Noel Torres wrote:
>>>>>> I think it would be possible, and even easy for the developers, =
to
>>>>>> program an extension to SMTP in which servers use OpenPGP among =
them,
>>>>>> independently of any TLS/SSL usage.
>>>>>>=20
>>>>>> Why: It helps stopping spam because the receiver server can trust =
the
>>>>>> identity of the sender, and it helps avoiding wiretapping.
>>>>>=20
>>>>> Please explain it's superiority over DKIM and SPF and DMARC.
>>>>>=20
>>>>> d/
>>>>>=20
>>>> Hi Dave
>>>>=20
>>>> In short, DKIM does not avoid wiretapping on itself, SPF does not,
>>>> either, nor DMARC.
>>>=20
>>> You cited the benefit you are seeking as trusting who the 'sender' =
was.  That's an authentication/signature task, not a =
confidentiality/encryption task.
>>>=20
>>> d/
>>>=20
>>> ps. the mere fact of authentication does not vet the trustworthiness =
of the validated identity.
>>=20
>> Dear Dave,
>>=20
>> As you know, DKIM can not authenticate the sender.  DKIM =
authenticates some unseen domain signed a portion of the message.  DKIM =
does not confirm the signing domain intended to send the message to the =
recipient either.  Nor does DKIM ensure valid message structure where =
acceptance on the basis of trusted DKIM signatures can be hazardous, =
contrary to the process described in the DKIM deployment RFC.  In =
addition, because DKIM can not authenticate the sender, it can never =
abate email abuse either, nor was that ever described as a supported =
feature.
>=20
> What is your definition of sender?  The sender can be many different
> entities in this context.. I can be the relay, it could be the =
domain's
> email server or it could be the end user...

Based on whatever definition used, an entity held accountable for =
sending a message to a recipient not desiring its receipt should be =
authenticated for having actually issued the message to said recipient.  =
DKIM can not do this.  It only indicates an unseen signing domain =
handled the signed portion of the message and nothing more. =20

> =46rom my understanding, DKIM is basicly a statement from a =
responsible
> domain, that I have done my best to validate that this is a legitimate
> email and I don't relay for untrusted people, etc...

Responsible for what?  When the DKIM mechanism fails to ensure elements =
needed to hold domains accountable for unwanted email abusing a =
recipient, it would be unwise to assume the domain is therefore =
responsible.  Any such assumption can be easily poisoned.=20
 =20
>> StartTLS is not affected by message structure and indicates the =
intended recipient as well as identifying an accountable sender. =
StartTLS offers a safe basis for trust, reputation, and acceptance.  =
DKIM in conjunction with DMARC has very limited applicability and only =
prevents =46rom header field spoofing but even then allows click-able =
links to be injected into a spoofed Subject header field.
>=20
> Maybe I'm missing something, but I'm not sure how STARTTLS (plus =
presuably
> w/ DANE) can authenticate that the client is the sender?  I might be
> missing the RFC/standard/etc. that allows server to auth the client =
cert..

Normally the critical aspect when submitting a message is to ensure =
credentials are shared with the intended submission server.  This is =
where StartTLS is normally used, but StartTLS can also exchange client =
certificates.  Since client certificates become essential when accepting =
encrypted email over IPv6, perhaps the presence of a DANE certificate =
located at the MX could automatically signal a paradigm change.

> In most cases I've seen, it's only the client/relay authenticating =
server..

You mean StartTLS verifying the domain of the server requesting client =
credentials?  Then yes.

>> ps. DKIM authentication does not vet the message nor the =
trustworthiness of the signing domain.  DKIM does not validate any =
identity either.
>=20
> As far as my understanding, nor does STARTTLS...

This represents an unused feature that could greatly strengthen and =
protect all forms of email.  Abuse would drop significantly within a new =
paradigm that safely permits the establishment of domain reputations, =
while also enabling services to operate safely from any IP address and =
from any provider.  Not even Reverse DNS has less overhead when DNS =
timeouts are considered.

Regards,
Douglas Otis=

From envite@rolamasao.org  Wed Oct 23 14:21:47 2013
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On 23/10/13 22:05, Douglas Otis wrote:
[...]

> This represents an unused feature that could greatly strengthen and protect all forms of email.  Abuse would drop significantly within a new paradigm that safely permits the establishment of domain reputations, while also enabling services to operate safely from any IP address and from any provider.  Not even Reverse DNS has less overhead when DNS timeouts are considered.

Domain reputations are also considered in my idea, but I'm starting to 
think I'm losing time and energy here, since I see only negativity.

Do some of you want to read how do I think it should be implemented?

Them, you can discuss with a basis and not just pre-concepts about other 
methods (STARTTLS/DKIM/whatever)
>
> Regards,
> Douglas Otis
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>

Thanks

Noel
er Envite

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Subject: Re: [perpass] e-mail security idea: server2server PGP
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Noel Torres wrote this message on Wed, Oct 23, 2013 at 22:21 +0100:
> On 23/10/13 22:05, Douglas Otis wrote:
> [...]
> 
> >This represents an unused feature that could greatly strengthen and 
> >protect all forms of email.  Abuse would drop significantly within a new 
> >paradigm that safely permits the establishment of domain reputations, 
> >while also enabling services to operate safely from any IP address and 
> >from any provider.  Not even Reverse DNS has less overhead when DNS 
> >timeouts are considered.
> 
> Domain reputations are also considered in my idea, but I'm starting to 
> think I'm losing time and energy here, since I see only negativity.
> 
> Do some of you want to read how do I think it should be implemented?
> 
> Them, you can discuss with a basis and not just pre-concepts about other 
> methods (STARTTLS/DKIM/whatever)

My question is what does your idea bring the isn't already covered by
some combination of STARTTLS/DKIM/SPF/etc?  Assuming small modifications
are made, such as expanding SPF to include the FP of the sender's cert.

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."

From envite@rolamasao.org  Wed Oct 23 14:39:34 2013
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On 23/10/13 22:35, John-Mark Gurney wrote:
[...]
>
> My question is what does your idea bring the isn't already covered by
> some combination of STARTTLS/DKIM/SPF/etc?  Assuming small modifications
> are made, such as expanding SPF to include the FP of the sender's cert.
>
Mostly two things:
a) stopping some spam messages before they even are transmitted
b) not being a combination but an idea that naturally addresses both 
wiretapping and spam
Also
c) not being DNS dependant

I will follow a good advice from one list member and will write a 
document with the idea.

Thanks all

Noel
er Envite

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To: Stephen Kent <kent@bbn.com>
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Subject: Re: [perpass] mandatory-to-implement vs. more?
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> Based only on the story that you cited, and your observation about
> telcos being the sources of the info, might it be the case that the
> telcos were also the mail providers? I'm not sure how to interpret
> the slides the the cite story included. That sort of explanation
> would be consistent with Ned's observations about commercial provider
> use of SSL to protect IMAP/POP access.

It is almost certainly the case that large ISPs and MSPs are what's being
targeted, because, to paraphrase the quote falsely attributed to Willie Sutton,
"That's where the data is".

So perhaps we should, you know, take a closer look at the current state of play
in this space. Given the relatively small number of players this isn't
all that difficult. 

For my testing I used a client that supported the following ciphersuites:

  TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (0x0088)
  TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA (0x0087)
  TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x0039)
  TLS_DHE_DSS_WITH_AES_256_CBC_SHA (0x0038)
  TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (0x0084)
  TLS_RSA_WITH_AES_256_CBC_SHA (0x0035)
  TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (0x0045)
  TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA (0x0044)
  TLS_DHE_DSS_WITH_RC4_128_SHA (0x0066)
  TLS_DHE_RSA_WITH_AES_128_CBC_SHA (0x0033)
  TLS_DHE_DSS_WITH_AES_128_CBC_SHA (0x0032)
  TLS_RSA_WITH_SEED_CBC_SHA (0x0096)
  TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (0x0041)
  SSL_RSA_WITH_RC4_128_MD5 (0x0004)
  SSL_RSA_WITH_RC4_128_SHA (0x0005)
  TLS_RSA_WITH_AES_128_CBC_SHA (0x002f)
  SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA (0x0016)
  SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA (0x0013)
  SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA (0xfeff)
  SSL_RSA_WITH_3DES_EDE_CBC_SHA (0x000a)
  SSL_CK_RC4_128_WITH_MD5 (0xff01)
  SSL_CK_RC2_128_CBC_WITH_MD5 (0xff03)
  SSL_CK_DES_192_EDE3_CBC_WITH_MD5 (0xff07)

As most people are probably aware, the way SSL/TLS works is the client
proposes then the server selects the ciphersuite to use. The client I'm
using lets me enable whatever ciphersuite set I want, so when the server
selected something less than stellar I used this capability to see if I could
force a better result.

I mostly tested large MSPs and North American ISPs, but I tried a few European
and Australian ones as well. I attemped a few Asian and Middle Eastern
sites, but setup directions written in scripts I don't understand proved to
be too much of an obstable.

Anyway, the results are as follows:

1and1.com - imaps and imap, imap allows starttls
   imap.1and1.com - TLS_RSA_WITH_AES_256_CBC_SHA
     no DHE variants available

Apple: imaps only
   imap.mail.me.com - SSL_RSA_WITH_RC4_128_MD5,
     SSL_RSA_WITH_3DES_EDE_CBC_SHA if RC4 disabled,
     TLS_RSA_WITH_AES_256_CBC_SHA will be used if only AES ciphers allowed,
     no DHE variants available
     
AOL: imaps and imap, imap allows starttls
   imap.aol.com - TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
     TLS_DHE_RSA_WITH_AES_256_CBC_SHA available
   
Cox Cable: imaps only
   imap.cox.net - TLS_RSA_WITH_AES_256_CBC_SHA, no DHE variants available

Charter: imaps only
   mobile.charter.net - TLS_RSA_WITH_AES_256_CBC_SHA,
     SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA available
   
Covad: imaps and imap, imap allows starttls
   mail.covad.net - TLS_RSA_WITH_CAMELLIA_256_CBC_SHA,
     TLS_RSA_WITH_AES_256_CBC_SHA if Camillia disabled
     no DHE variants available

Eastlink: imaps and imap, imap allows starttls
   mail.eastlink.ca - TLS_RSA_WITH_AES_256_CBC_SHA, no DHE variants available

free.fr: imaps and imap, imap w/o starttls
   imap.free.fr - TLS_DHE_RSA_WITH_AES_256_CBC_SHA
  
GoDaddy: imaps and imap, imap allows starttls
   imap.secureserver.net - TLS_RSA_WITH_CAMELLIA_256_CBC_SHA,
     TLS_RSA_WITH_AES_256_CBC_SHA if Camillia disabled,
     no DHE variants available

Gmail: imaps only
   imap.gmail.com - SSL_RSA_WITH_RC4_128_SHA,
     TLS_RSA_WITH_AES_128_CBC_SHA if RC4 disabled, no DHE variants available

GMX Mail: imaps and imap, imap w/o starttls
   imap.gmx.com - TLS_RSA_WITH_AES_256_CBC_SHA
     no DHE variants available

Hotmail: imaps only
   imap-mail.outlook.com - TLS_RSA_WITH_AES_128_CBC_SHA,
     no DHE variants available

iinet: imaps and imap, imap allows starttls
   mail.iinet.net.au - TLS_RSA_WITH_AES_256_CBC_SHA
     TLS_DHE_RSA_WITH_AES_256_CBC_SHA available

Insight Communications: imaps and imap, imap allows starttls
   mail.insightbb.com - TLS_DHE_RSA_WITH_AES_256_CBC_SHA

Internode: imaps and imap, imap w/o starttls
   mail.internode.on.net - SSL_RSA_WITH_RC4_128_MD5
     SSL_RSA_WITH_3DES_EDE_CBC_SHA if RC4 disabled,
     TLS_RSA_WITH_AES_128_CBC_SHA if only AES ciphers allowed,
     no DHE variants available

Namesco: imaps and imap, imap w/o starttls
   imap.hosts.co.uk - TLS_DHE_RSA_WITH_AES_256_CBC_SHA

neuf.fr: imaps and imap, imap w/o starttls
   imap.neuf.fr - TLS_DHE_RSA_WITH_AES_256_CBC_SHA

Optus Broadband: imaps and imap, imap allows starttls
   mail.optusnet.com.au - TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA
     TLS_DHE_RSA_WITH_AES_256_CBC_SHA is Camilla disabled

telefonica.net: imap w/o starttls
   imap.telefonica.net

tre.it: imap w/o starttls (8 year old server software!)
   imap.tre.it

Yahoo: imaps and imap, imap requires starttls
   imap.mail.yahoo.com - SSL_RSA_WITH_RC4_128_SHA,
     TLS_RSA_WITH_AES_128_CBC_SHA if RC4 disabled,
     no DHE variants available

Videotron: imap w/o starttls
   imap.videotron.ca

Notes:

(1) Verizon, Comcast, Netzero, Earthlink, Mindspring, Sprint (?),
    Shaw Cable, lightspeed.ca, Cogeco, Time Warner Cable,
    CableVision(OptimumOnline) (?), Bigpond, and Mediacom do not support IMAP
(2) AT&T?, Rogers Cable use Yahoo for IMAP
(3) Cable One, Telecable uses gmail for IMAP
(4) The presence of Camellia as an option is explained by the fact that in
    NSS if Camillia is enabled at all it is used preferentially. (Although
    maybe not in the case of Optus Broadband.)

Keeping in mind that this is hardly a comprehensive list of the world's ISPs,
I'll first note that the ciphersuite situation is better than I expected. A
minority of services, albeit some of the biggest ones, prefer RC4. And nobody
insisted on it. Quite a few even go so far as to prefer a DHE variant. But more
of them need to support and prefer something in the DHE/AES set. This is a place
where some clear guidance would probably be helpful, as long as it involves
using ciphersuites for which support is readily available. (The obvious starting
point is for servers to always prefer AES to RC4 and always prefer DHE variants
to non-DHE variants. I'll the ranking of those two to those more pedantic than
I.)

Only three of the services tested, one in North America and the others in
Europe, offered no SSL/TLS at all. That strikes me as pretty good coverage
overall, and perhaps the Snoden revelations will make something good happen to
those, as it is doing at Yahoo.

But these results, while encouraging, don't say anything good about the IETF's
ability to mandate security. The IETF recommended best operational practice
(effectively a SHOULD in RFC 3501) is to only offer port 143 and require
STARTTLS on that port, as indicated by the LOGINDISABLED capability. Not a
single provider I tested implemented that specific variant. Not. One.

The closest was Yahoo - you know, the folks whose web mail has no security at
all - which does operate port 143 that way, but they also offered the
nonstandard imaps on port 993. Five services, including most of the largest
ones, offered the nonstandard imaps only. An equal number offered imaps but no
SSL/TLS capability on port 143. (These results are explained by the use of load
balancers that act as the termination point for SSL/TLS.)

Anyway, I've spent enough time on this, but if anyone else wants to throw
additional results for large ISPs and MSPs my way, especially from places using
scripts I don't grok, I'd appreciate it.

				Ned

From ned+perpass@mrochek.com  Wed Oct 23 15:30:07 2013
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From: ned+perpass@mrochek.com
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To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Cc: Jim Fenton <fenton@bluepopcorn.net>, perpass@ietf.org
Subject: Re: [perpass] perpass list email not sent encrypted...
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> On 10/23/2013 08:09 PM, Jim Fenton wrote:
> > On 10/23/13 11:28 AM, John-Mark Gurney wrote:
> >> Is it just me, or is it funny that we are talking about securing the
> >> inet, yet the ietf apparently doesn't do STARTTLS when sending email?
> >> and hence the perpass email list is sent out unencrypted...
> >>
> >> Guess I'll drop a note to postmaster@ietf.com.
> >>
> > It's not just you.  IETF SHOULD be using STARTTLS for email, not
> > particularly for this or other mailing lists (where attackers could just
> > read the archives, anyway) but because it's the Right Thing To Do.

> That was discussed in the DANE meeting in Berlin and
> there's a plan for eating our own dogfood, but I'm
> not sure where its at. Will check.

If by "for email" you mean "for outgoing SMTP relay", this this is *not*
as easy as turning on opportunistic use of STARTTLS in SMTP.

The main problem is dealing with SSL/TLS negotiation failures, either because
you don't share a ciphersuite or because the server says it supports STARTTLS
but doesn't actally have a certificate installed. (The latter is distressingly
common.) When this happens you have to close the connection and try again. Some
SMTP clients support this, others do not.

As for DANE or other DNS announcements, it's far too new to be of much use.

				Ned

From kathleen.moriarty@emc.com  Wed Oct 23 15:36:53 2013
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From: "Moriarty, Kathleen" <kathleen.moriarty@emc.com>
To: Noel Torres <envite@rolamasao.org>
Date: Wed, 23 Oct 2013 18:35:53 -0400
Thread-Topic: [perpass] e-mail security idea: server2server PGP
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Noel,

Great, writing a draft will be helpful and appreciated.  While the comments=
 may have come across as negative, think of them as helpful to possibly imp=
rove your idea or to combine with other ideas as appropriate through brains=
torming.  What I see is interest in a discussion, that's positive. =20

Seeing the full idea may change minds or offer opportunities for you to ass=
ist with improvements to existing efforts. =20

Kathleen=20
(Reading way too much for the diversity work - LOL).=20

Sent from my iPhone

On Oct 23, 2013, at 4:39 PM, "Noel Torres" <envite@rolamasao.org> wrote:

> On 23/10/13 22:35, John-Mark Gurney wrote:
> [...]
>>=20
>> My question is what does your idea bring the isn't already covered by
>> some combination of STARTTLS/DKIM/SPF/etc?  Assuming small modifications
>> are made, such as expanding SPF to include the FP of the sender's cert.
> Mostly two things:
> a) stopping some spam messages before they even are transmitted
> b) not being a combination but an idea that naturally addresses both=20
> wiretapping and spam
> Also
> c) not being DNS dependant
>=20
> I will follow a good advice from one list member and will write a=20
> document with the idea.
>=20
> Thanks all
>=20
> Noel
> er Envite
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>=20

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Hiya,

On 10/23/2013 07:30 PM, ned+perpass@mrochek.com wrote:
> 
> Keeping in mind that this is hardly a comprehensive list of the world's
> ISPs,

Quite useful though. Thanks.

> I'll first note that the ciphersuite situation is better than I expected. 

Ditto.

> A
> minority of services, albeit some of the biggest ones, prefer RC4. And
> nobody
> insisted on it. Quite a few even go so far as to prefer a DHE variant.
> But more
> of them need to support and prefer something in the DHE/AES set. This is
> a place
> where some clear guidance would probably be helpful, as long as it involves
> using ciphersuites for which support is readily available. (The obvious
> starting
> point is for servers to always prefer AES to RC4 and always prefer DHE
> variants
> to non-DHE variants. I'll the ranking of those two to those more
> pedantic than
> I.)

Any voluneteers? Might be close enough to fit in the smtp/tls
draft Alexey said he'd look at.

> 
> Only three of the services tested, one in North America and the others in
> Europe, offered no SSL/TLS at all. That strikes me as pretty good coverage
> overall, and perhaps the Snoden revelations will make something good
> happen to
> those, as it is doing at Yahoo.
> 
> But these results, while encouraging, don't say anything good about the
> IETF's
> ability to mandate security. The IETF recommended best operational practice
> (effectively a SHOULD in RFC 3501) is to only offer port 143 and require
> STARTTLS on that port, as indicated by the LOGINDISABLED capability. Not a
> single provider I tested implemented that specific variant. Not. One.

Yep. I agree that's a problem. Seems we disagree about the
conclusion to be drawn though. For me, the above indicates
that our current "make 'em specify a MTI (in the RFC6919
sense)" failed in this case.

I conjecture that had there been a more-than-MTI practice in
place way back then, its a good bit more likely we'd not have
screwed up on the TLS stuff. And so I figure its worth
investigating that some more. (Not for IMAP, but in general
for current/future work.)

S.





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Cc: Jim Fenton <fenton@bluepopcorn.net>, perpass@ietf.org, Warren Kumari <warren@kumari.net>
Subject: Re: [perpass] perpass list email not sent encrypted...
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On Oct 23, 2013, at 3:35 PM, Stephen Farrell <stephen.farrell@cs.tcd.ie> =
wrote:

>=20
>=20
> On 10/23/2013 08:09 PM, Jim Fenton wrote:
>> On 10/23/13 11:28 AM, John-Mark Gurney wrote:
>>> Is it just me, or is it funny that we are talking about securing the
>>> inet, yet the ietf apparently doesn't do STARTTLS when sending =
email?
>>> and hence the perpass email list is sent out unencrypted...
>>>=20
>>> Guess I'll drop a note to postmaster@ietf.com.
>>>=20
>> It's not just you.  IETF SHOULD be using STARTTLS for email, not
>> particularly for this or other mailing lists (where attackers could =
just
>> read the archives, anyway) but because it's the Right Thing To Do.
>=20
> That was discussed in the DANE meeting in Berlin and
> there's a plan for eating our own dogfood, but I'm
> not sure where its at. Will check.

Yup.

We reached out to the folk who run the mail servers for the IETF (AMS).

The servers that are currently handling mail are (or, were when I =
chatted with them) older boxes, running older versions of Linux (and, =
presumably older MTA).
AMS was in the process of deploying shiny new boxes, with new OS, etc. =
I'm suspecting that the plans might have gotten delayed a bit.

Once the newer boxes are up the plan (from what I understand) was to =
migrate over to them, and then enable STARTTLS. After that we were =
planning on doing DANE.

W

>=20
> S.
>=20
>>=20
>> -Jim
>> _______________________________________________
>> perpass mailing list
>> perpass@ietf.org
>> https://www.ietf.org/mailman/listinfo/perpass
>>=20
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>=20

--
What our ancestors would really be thinking, if they were alive today, =
is: "Why is it so dark in here?"

    -- (Terry Pratchett, Pyramids)



From kathleen.moriarty@emc.com  Wed Oct 23 16:19:19 2013
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From: "Moriarty, Kathleen" <kathleen.moriarty@emc.com>
To: Cullen Jennings <fluffy@iii.ca>
Date: Wed, 23 Oct 2013 19:18:59 -0400
Thread-Topic: [perpass] Few things the IETF might standardize for secure collaboration
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Cc: "perpass@ietf.org" <perpass@ietf.org>
Subject: Re: [perpass] Few things the IETF might standardize for secure	collaboration
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Cullen,

Nice draft!  I have been thinking about this problem as well and wonder whe=
re the line is for those who want protections from monitoring.  What level =
of protection is needed so that the options we provide make sense and are a=
ctually used?  Do we need to go further and what is the demand?

In addition to your proposal, I am wondering if we need alternate algorithm=
s when worried about these use cases (e.g. Twofish instead of AES, etc.).  =
Also, having the IdP as a service provider may be a showstopper for those c=
oncerned with monitoring, why couldn't that service provider be contacted a=
s well?

The point at which encryption is performed is use case dependent.  You ment=
ion encryption at the client in the strategy slide, which is very important=
 for this use case (not at the host or storage level).  I would suggest rep=
eating this in the Encrypted Data Content slide - encryption at the client =
or 'guest' level.  Guest is another term I have been hearing, but I am not =
sure if it is a common term.

Thanks,
Kathleen=20

Sent from my iPhone

On Oct 20, 2013, at 5:57 PM, "Cullen Jennings" <fluffy@iii.ca> wrote:

>=20
> I've been thinking about how to build cloud collaborations systems where =
the data is encrypted and the cloud does not have the keys. Very interested=
 in hearing others thoughts on how to do this.=20
>=20
> Near the end is a list of things that it would be helpful if the IETF sta=
ndardized.=20
>=20
> http://www.ietf.org/id/draft-jennings-perpass-secure-rai-cloud-00.pdf
>=20
> Cullen
>=20
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>=20

From rlb@ipv.sx  Wed Oct 23 17:47:58 2013
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Cc: Jim Fenton <fenton@bluepopcorn.net>, perpass <perpass@ietf.org>
Subject: Re: [perpass] perpass list email not sent encrypted...
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--001a11c2f3a6bdff3504e971fb9b
Content-Type: text/plain; charset=ISO-8859-1

On Wed, Oct 23, 2013 at 3:35 PM, Stephen Farrell
<stephen.farrell@cs.tcd.ie>wrote:
>
>
> On 10/23/2013 08:09 PM, Jim Fenton wrote:
> > On 10/23/13 11:28 AM, John-Mark Gurney wrote:
> >> Is it just me, or is it funny that we are talking about securing the
> >> inet, yet the ietf apparently doesn't do STARTTLS when sending email?
> >> and hence the perpass email list is sent out unencrypted...
> >>
> >> Guess I'll drop a note to postmaster@ietf.com.
> >>
> > It's not just you.  IETF SHOULD be using STARTTLS for email, not
> > particularly for this or other mailing lists (where attackers could just
> > read the archives, anyway) but because it's the Right Thing To Do.
>
> That was discussed in the DANE meeting in Berlin and
> there's a plan for eating our own dogfood, but I'm
> not sure where its at. Will check.
>
> S.
>

I can sort of see the dogfood / Right Thing To Do argument.  But it seems
kind of silly to waste the bits / cycles encrypting things whose entire
point is to be public.

--Richard



> >
> > -Jim
> > _______________________________________________
> > perpass mailing list
> > perpass@ietf.org
> > https://www.ietf.org/mailman/listinfo/perpass
> >
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>

--001a11c2f3a6bdff3504e971fb9b
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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On W=
ed, Oct 23, 2013 at 3:35 PM, Stephen Farrell <span dir=3D"ltr">&lt;<a href=
=3D"mailto:stephen.farrell@cs.tcd.ie" target=3D"_blank">stephen.farrell@cs.=
tcd.ie</a>&gt;</span> wrote:<blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class=3D"im">
<br>
On 10/23/2013 08:09 PM, Jim Fenton wrote:<br>
&gt; On 10/23/13 11:28 AM, John-Mark Gurney wrote:<br>
&gt;&gt; Is it just me, or is it funny that we are talking about securing t=
he<br>
&gt;&gt; inet, yet the ietf apparently doesn&#39;t do STARTTLS when sending=
 email?<br>
&gt;&gt; and hence the perpass email list is sent out unencrypted...<br>
&gt;&gt;<br>
&gt;&gt; Guess I&#39;ll drop a note to <a href=3D"mailto:postmaster@ietf.co=
m">postmaster@ietf.com</a>.<br>
&gt;&gt;<br>
&gt; It&#39;s not just you. =A0IETF SHOULD be using STARTTLS for email, not=
<br>
&gt; particularly for this or other mailing lists (where attackers could ju=
st<br>
&gt; read the archives, anyway) but because it&#39;s the Right Thing To Do.=
<br>
<br>
</div>That was discussed in the DANE meeting in Berlin and<br>
there&#39;s a plan for eating our own dogfood, but I&#39;m<br>
not sure where its at. Will check.<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
S.<br></div></div></blockquote><div><br></div><div>I can sort of see the do=
gfood / Right Thing To Do argument. =A0But it seems kind of silly to waste =
the bits / cycles encrypting things whose entire point is to be public. =A0=
</div>
<div><br></div><div>--Richard</div><div><br></div><div>=A0</div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex"><div class=3D"HOEnZb"><div class=3D"h5">
&gt;<br>
&gt; -Jim<br>
&gt; _______________________________________________<br>
&gt; perpass mailing list<br>
&gt; <a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_b=
lank">https://www.ietf.org/mailman/listinfo/perpass</a><br>
&gt;<br>
_______________________________________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/perpass</a><br>
</div></div></blockquote></div><br></div></div>

--001a11c2f3a6bdff3504e971fb9b--

From stephen.farrell@cs.tcd.ie  Wed Oct 23 17:53:31 2013
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Subject: Re: [perpass] perpass list email not sent encrypted...
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On 10/24/2013 01:47 AM, Richard Barnes wrote:
> I can sort of see the dogfood / Right Thing To Do argument.  But it seems
> kind of silly to waste the bits / cycles encrypting things whose entire
> point is to be public.

Not everything that goes in or out of ietf.org via
SMTP is public. See ombudspersonage discussion for
example. Or nomcom. For most lists, yes, this isn't
much of a deal over and above dogfood consumption.

S


> 
> --Richard
> 
> 
> 
>>>
>>> -Jim
>>> _______________________________________________
>>> perpass mailing list
>>> perpass@ietf.org
>>> https://www.ietf.org/mailman/listinfo/perpass
>>>
>> _______________________________________________
>> perpass mailing list
>> perpass@ietf.org
>> https://www.ietf.org/mailman/listinfo/perpass
>>
> 
> 
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

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References: <20131023182804.GH56872@funkthat.com> <52681EF6.2030801@bluepopcorn.net> <52682514.4070609@cs.tcd.ie> <CAL02cgSnN6x7R3Se1kajwJkXzWAkoLtK0HDe9pYiNNWyi7WEag@mail.gmail.com> <52686F83.5070508@cs.tcd.ie>
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Subject: Re: [perpass] perpass list email not sent encrypted...
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--001a11333dc8f5b1e104e972e823
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On Wed, Oct 23, 2013 at 8:53 PM, Stephen Farrell
<stephen.farrell@cs.tcd.ie>wrote:
>
> On 10/24/2013 01:47 AM, Richard Barnes wrote:
> > I can sort of see the dogfood / Right Thing To Do argument.  But it seems
> > kind of silly to waste the bits / cycles encrypting things whose entire
> > point is to be public.
>
> Not everything that goes in or out of ietf.org via
> SMTP is public. See ombudspersonage discussion for
> example. Or nomcom. For most lists, yes, this isn't
> much of a deal over and above dogfood consumption.
>

Ok, fair enough.  Those instances had slipped my mind.  Perhaps this a good
illustration of why turning on TLS is the Right Thing To Do -- even if you
think everything transiting your mail server is public, there's probably
something you've forgotten.  :)

--Richard




>
> S
>
>
> >
> > --Richard
> >
> >
> >
> >>>
> >>> -Jim
> >>> _______________________________________________
> >>> perpass mailing list
> >>> perpass@ietf.org
> >>> https://www.ietf.org/mailman/listinfo/perpass
> >>>
> >> _______________________________________________
> >> perpass mailing list
> >> perpass@ietf.org
> >> https://www.ietf.org/mailman/listinfo/perpass
> >>
> >
> >
> >
> > _______________________________________________
> > perpass mailing list
> > perpass@ietf.org
> > https://www.ietf.org/mailman/listinfo/perpass
> >
>

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On W=
ed, Oct 23, 2013 at 8:53 PM, Stephen Farrell <span dir=3D"ltr">&lt;<a href=
=3D"mailto:stephen.farrell@cs.tcd.ie" target=3D"_blank">stephen.farrell@cs.=
tcd.ie</a>&gt;</span> wrote:<blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class=3D"im">
On 10/24/2013 01:47 AM, Richard Barnes wrote:<br>
&gt; I can sort of see the dogfood / Right Thing To Do argument. =A0But it =
seems<br>
&gt; kind of silly to waste the bits / cycles encrypting things whose entir=
e<br>
&gt; point is to be public.<br>
<br>
</div>Not everything that goes in or out of <a href=3D"http://ietf.org" tar=
get=3D"_blank">ietf.org</a> via<br>
SMTP is public. See ombudspersonage discussion for<br>
example. Or nomcom. For most lists, yes, this isn&#39;t<br>
much of a deal over and above dogfood consumption.<br></blockquote><div><br=
></div><div>Ok, fair enough. =A0Those instances had slipped my mind. =A0Per=
haps this a good illustration of why turning on TLS is the Right Thing To D=
o -- even if you think everything transiting your mail server is public, th=
ere&#39;s probably something you&#39;ve forgotten. =A0:)</div>
<div><br></div><div>--Richard</div><div><br></div><div><br></div><div>=A0</=
div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-lef=
t:1px #ccc solid;padding-left:1ex">
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
S<br>
</font></span><div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
&gt;<br>
&gt; --Richard<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; -Jim<br>
&gt;&gt;&gt; _______________________________________________<br>
&gt;&gt;&gt; perpass mailing list<br>
&gt;&gt;&gt; <a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
&gt;&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/perpass" targ=
et=3D"_blank">https://www.ietf.org/mailman/listinfo/perpass</a><br>
&gt;&gt;&gt;<br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; perpass mailing list<br>
&gt;&gt; <a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=
=3D"_blank">https://www.ietf.org/mailman/listinfo/perpass</a><br>
&gt;&gt;<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; perpass mailing list<br>
&gt; <a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_b=
lank">https://www.ietf.org/mailman/listinfo/perpass</a><br>
&gt;<br>
</div></div></blockquote></div><br></div></div>

--001a11333dc8f5b1e104e972e823--

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On Oct 21, 2013, at 7:32 AM, Nicholas Weaver <nweaver@icsi.berkeley.edu> =
wrote:

> "I don't trust .com, I don't trust .ru, but I trust they won't collude =
against me" is a very interesting property

I have thought about this from a game theory point of view. Imagine a =
game where both player saw all the traffic pass though an under sea =
fiber optic cable. And then on some day in the future neither player can =
see any of the traffic unless they one player enables the other. =
Obviously if they both cooperated, they would be back the how it was at =
the start of the game. The question of if they will cooperate or not =
seems to me to depend on how they both use the data they used to get =
from the fiber optic cable, and the calculus of value of the information =
to them vs the value of the other player not having the information.=20

I get your point but I'm pretty cautious about assumption of who will =
and will not cooperate when people feel the end result justifies pretty =
outrageous means of getting to the end result. That said, I'm a fan of =
the types of check and balances you get when more than one person has to =
behave badly.=20



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HI Dan,=20

inline =E2=80=A6

On Oct 21, 2013, at 6:11 AM, Dan York <york@isoc.org> wrote:

> Cullen,
>=20
> On 10/20/13 6:58 PM, "Cullen Jennings" <fluffy@iii.ca> wrote:
>=20
>=20
>> I've been thinking about how to build cloud collaborations systems =
where
>> the data is encrypted and the cloud does not have the keys. Very
>> interested in hearing others thoughts on how to do this.
>=20
> Good document. In a quick read I naturally have to react to slide 23
> (Trusting DNS) and also slide 11 (Certificate Authority).  On slide =
23,
> you say "Sorry, can't trust this yet.", but what happens as we get =
more
> DNSSEC deployed?  We're already seeing increased validation within =
caching
> resolvers and some measurements are showing around 8% of all DNS =
queries
> coming from resolvers that perform validation.  We're seeing steady =
growth
> in the number of DNSSEC-signed domains.  I know there are those who =
are
> skeptical about DNSSEC deployment, but I'm definitely seeing real
> growth... and see a number of trends pointing to that only continuing.

No question that things are going the right direction. Let figure out =
how we could use this and likely when. In fairness it will take time to =
build something like I am proposing and DNSSEC will be better then than =
it is now.=20

>=20
> Similarly, on slide 11 you mention the ongoing issue that CA's can =
issue
> bad certs and the goal is to detect this.  We do have an existing
> mechanism that can help here.  DANE (RFC 6698) allows the zone =
operator to
> include a fingerprint of a cert (or an entire cert) in a DNS zone and =
then
> sign that with DNSSEC.  Couple that with DNSSEC-validating resolvers =
and
> you've got a way to add an additional layer of trust assertions on top =
of
> the CA infrastructure.  Sure, CAs can still issue bad certs, but if =
the
> cert being offered doesn't match the cert fingerprint securely stored =
in
> DNS then the endpoint should know right then to reject the bad cert.

Using DANE for belt and suspenders on CAs seems good. I also think it =
would be well worth think about who is in the trust chain for a domain =
that was in .us vs say .cn and consider how that might all play out from =
security point of view. I had not thought much about this but it does =
deserve thinking about what we can do.=20


>=20
> Typo: slide 8 - I think you meant "in that you" - "The CA is "honest" =
is
> that you can tell if it issues your certi=EF=AC=81cate to someone else =
but there
> is no way to stop it from doing that"

oops - yes - The type of thing I was thinking about here are various =
proposal where CA publish all the certificates they have issued and =
there are various cryptographic hash chains that make it difficult for =
them to lie about this. That means a CA might be able to issue your cert =
to a bad guy but that it would later be possible to detect that.=20


>=20
>> Near the end is a list of things that it would be helpful if the IETF
>> standardized.
>=20
> Good list!

Tell me what to add to this list for DNSSEC / DANE that we are not =
already doing

> Dan
>=20
> --
> Dan York
> Senior Content Strategist, Internet Society
> york@isoc.org <mailto:york@isoc.org>   +1-802-735-1624
> Jabber: york@jabber.isoc.org <mailto:york@jabber.isoc.org>
> Skype: danyork   http://twitter.com/danyork
>=20
> http://www.internetsociety.org/deploy360/=20
>=20


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On Oct 23, 2013, at 5:18 PM, "Moriarty, Kathleen" =
<kathleen.moriarty@emc.com> wrote:

> Cullen,
>=20
> Nice draft!  I have been thinking about this problem as well and =
wonder where the line is for those who want protections from monitoring. =
 What level of protection is needed so that the options we provide make =
sense and are actually used?  Do we need to go further and what is the =
demand?

I'v been pitching we need to make it harder for the bad guys and easier =
for the good guys. I think the lowest hanging fruit right now is mostly =
in easier for the good guys. Lot so places we have no security because =
it is inconvenient. Opportunistic encryption for example might make it =
easier for the good guys to have some encryption even though it was not =
as good as authenticated encryption. I want to figure out how to make =
this all cheap and easy for the end user.=20

>=20
> In addition to your proposal, I am wondering if we need alternate =
algorithms when worried about these use cases (e.g. Twofish instead of =
AES, etc.).

I'm not a crypto guy but it seems someone needs to be thinking about =
this. I sort of mention the formation of a "Suite Z" for people that =
don't like "Suite B".


>  Also, having the IdP as a service provider may be a showstopper for =
those concerned with monitoring, why couldn't that service provider be =
contacted as well?

If Skype is both the service provide and the IdP, well this is not much =
different than the current situation. But if I could run my own IdP on =
hardware I trust, or my employer could run an IdP on a server they trust =
and I trust them, well that would make for a different model.=20


>=20
> The point at which encryption is performed is use case dependent.  You =
mention encryption at the client in the strategy slide, which is very =
important for this use case (not at the host or storage level).  I would =
suggest repeating this in the Encrypted Data Content slide - encryption =
at the client or 'guest' level.  Guest is another term I have been =
hearing, but I am not sure if it is a common term.

Hmm - I'm not familiar with this "Guest" term in this context - can you =
explain more.=20

>=20
> Thanks,
> Kathleen=20
>=20
> Sent from my iPhone
>=20
> On Oct 20, 2013, at 5:57 PM, "Cullen Jennings" <fluffy@iii.ca> wrote:
>=20
>>=20
>> I've been thinking about how to build cloud collaborations systems =
where the data is encrypted and the cloud does not have the keys. Very =
interested in hearing others thoughts on how to do this.=20
>>=20
>> Near the end is a list of things that it would be helpful if the IETF =
standardized.=20
>>=20
>> http://www.ietf.org/id/draft-jennings-perpass-secure-rai-cloud-00.pdf
>>=20
>> Cullen
>>=20
>> _______________________________________________
>> perpass mailing list
>> perpass@ietf.org
>> https://www.ietf.org/mailman/listinfo/perpass
>>=20


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From: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
To: "perpass@ietf.org" <perpass@ietf.org>
Thread-Topic: [perpass] mandatory-to-implement vs. more?
Thread-Index: AQHO0HlTWHjzzqOCKEW30jSYmSCrrg==
Date: Thu, 24 Oct 2013 05:24:35 +0000
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On Oct 9, 2013, at 9:28 PM, Christian Huitema <huitema@huitema.net> wrote:

>> For me, the question is: Nobody uses SIP/TLS now. Using SIP/TLS
>> would add some value. How can we make it more likely they do use
>> SIP/TLS?
>=20
> Define "nobody," please. Microsoft Lync uses SIP/TLS by default. That mus=
t
> be more than "nobody."
>=20
> -- Christian Huitema

And it used by the other nobody, Cisco=20

I realize it may be less common on service providers private  networks but =
the carriers assume they have adequate protection for the attacks they care=
 about just by controlling who has access to the private network.=20
=20
The only reason I mention this is that some people do read our stuff, read =
our security sections, and try to make a rational decision. The rational de=
cisions for many places that Cisco and Microsoft PBX's deploy is to turn on=
 TLS. The rational decision after reading the security sections we wrote fo=
r the service provider private networks may actually be to not use TLS. (no=
te I'm not arguing private networks are private, or that firewalls work, or=
 anything like that - I'm say that people make have thought about the secur=
ity and decided they had adequate protection against the attacks they cared=
 about - which to be clear were probably toll fraud and not confidentiality=
 of the media )

A threat models change, deployments do to. I'm pretty confident more than a=
 few business are rethinking the threat model of how much nations state gra=
de attackers might be sharing data with their competitors, or do that in th=
e future, and what they might do about that.=20






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From: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Thread-Topic: [perpass] draft agenda for Vancouver session
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The biggest thing I would add to this Agenda is a discussion of additional =
standards work the IETF could do to help the situtation.=20


On Oct 21, 2013, at 9:48 AM, Stephen Farrell <stephen.farrell@cs.tcd.ie> wr=
ote:

>=20
> Hi,
>=20
> I've posted a draft agenda [1] as previously outlined.
>=20
> Comments still welcome - folks are starting to make the
> various (small) bits of slideware so agenda-bash comments
> this week would be most useful.
>=20
> Thanks to Paul Wouters and Karen O'Donoghue for volunteering
> to scribe. One or two more might be useful - if you're up
> for it, just mail Sean and I.
>=20
> Ta,
> S.
>=20
> [1] https://datatracker.ietf.org/meeting/88/agenda/perpass/
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


From stephen.farrell@cs.tcd.ie  Thu Oct 24 02:00:55 2013
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On 10/24/2013 06:47 AM, Cullen Jennings (fluffy) wrote:
> 
> The biggest thing I would add to this Agenda is a discussion of
> additional standards work the IETF could do to help the situtation.

Fair point. That is the main goal of the session but
I can make it clearer.

Also, the idea of Scott's slot towards the end is that
he'll be building a summary/plan for things we should
be doing as the meeting progresses and will pop that
up near the end as about the last thing to discuss. Not
minutes/action-items as such but more an attempt to
capture exactly what you're after above as a plan.

Cheers,
S.

> 
> 
> On Oct 21, 2013, at 9:48 AM, Stephen Farrell
> <stephen.farrell@cs.tcd.ie> wrote:
> 
>> 
>> Hi,
>> 
>> I've posted a draft agenda [1] as previously outlined.
>> 
>> Comments still welcome - folks are starting to make the various
>> (small) bits of slideware so agenda-bash comments this week would
>> be most useful.
>> 
>> Thanks to Paul Wouters and Karen O'Donoghue for volunteering to
>> scribe. One or two more might be useful - if you're up for it, just
>> mail Sean and I.
>> 
>> Ta, S.
>> 
>> [1] https://datatracker.ietf.org/meeting/88/agenda/perpass/ 
>> _______________________________________________ perpass mailing
>> list perpass@ietf.org 
>> https://www.ietf.org/mailman/listinfo/perpass
> 
> _______________________________________________ perpass mailing list 
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
> 
> 

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From: "Moriarty, Kathleen" <kathleen.moriarty@emc.com>
To: Cullen Jennings <fluffy@iii.ca>
Date: Thu, 24 Oct 2013 09:11:54 -0400
Thread-Topic: [perpass] Few things the IETF might standardize for secure collaboration
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Thanks for the quick response, comments in-line.

Thanks,
Kathleen=20
-----Original Message-----
From: Cullen Jennings [mailto:fluffy@iii.ca]=20
Sent: Thursday, October 24, 2013 12:30 AM
To: Moriarty, Kathleen
Cc: perpass@ietf.org
Subject: Re: [perpass] Few things the IETF might standardize for secure col=
laboration


On Oct 23, 2013, at 5:18 PM, "Moriarty, Kathleen" <kathleen.moriarty@emc.co=
m> wrote:

> Cullen,
>=20
> Nice draft!  I have been thinking about this problem as well and wonder w=
here the line is for those who want protections from monitoring.  What leve=
l of protection is needed so that the options we provide make sense and are=
 actually used?  Do we need to go further and what is the demand?

I'v been pitching we need to make it harder for the bad guys and easier for=
 the good guys. I think the lowest hanging fruit right now is mostly in eas=
ier for the good guys. Lot so places we have no security because it is inco=
nvenient. Opportunistic encryption for example might make it easier for the=
 good guys to have some encryption even though it was not as good as authen=
ticated encryption. I want to figure out how to make this all cheap and eas=
y for the end user.=20

KM> Okay, that's a good goal and this may point to a question of what probl=
ems we try to solve in the area of monitoring or that the goal is clear for=
 any of the proposals (not intending to call this one out at all).  We will=
 wind up with different solutions if the focus is on preventing monitoring =
for those who are blissfully unaware from those who are actively seeking to=
 prevent monitoring.  The latter may not what to trust anymore and may want=
 to use alternate algorithms or add in more complex features to prevent mon=
itoring without worry of configuration complexities or protocol overhead.  =
Their decisions may or may not be based on cryptographic analysis either. =
=20

>=20
> In addition to your proposal, I am wondering if we need alternate algorit=
hms when worried about these use cases (e.g. Twofish instead of AES, etc.).

I'm not a crypto guy but it seems someone needs to be thinking about this. =
I sort of mention the formation of a "Suite Z" for people that don't like "=
Suite B".

KM> I'm not a cryptographer either and a move in this direction (at this po=
int - unless I missed some news) would be suspicion driven rather than thro=
ugh any actual analysis.  The people who are reading what has been publishe=
d and have purchasing power may not be cryptographers either.  I have only =
heard of a few requests, so it would be interesting to observe trends in th=
is area to see if something needs to be done so that alternate options are =
secure IF they are in demand.


>  Also, having the IdP as a service provider may be a showstopper for thos=
e concerned with monitoring, why couldn't that service provider be contacte=
d as well?

If Skype is both the service provide and the IdP, well this is not much dif=
ferent than the current situation. But if I could run my own IdP on hardwar=
e I trust, or my employer could run an IdP on a server they trust and I tru=
st them, well that would make for a different model.=20

KM> Okay, that model makes sense to me.  I asked the question because there=
 is a new service already that offers key management from a service provide=
r, supporting alternate algorithms so that the keys and encryption is not w=
here your data is stored.  I can try to dig up the link.  Someone sent me i=
t to review and my first take on that was if a customer was worried about m=
onitoring, they would not want their keys at any service provider. =20


>=20
> The point at which encryption is performed is use case dependent.  You me=
ntion encryption at the client in the strategy slide, which is very importa=
nt for this use case (not at the host or storage level).  I would suggest r=
epeating this in the Encrypted Data Content slide - encryption at the clien=
t or 'guest' level.  Guest is another term I have been hearing, but I am no=
t sure if it is a common term.

Hmm - I'm not familiar with this "Guest" term in this context - can you exp=
lain more.=20

KM> Essentially, the same as client in your description.  I was not sure if=
 it was becoming a common term or if the terminology in that circle was uni=
que :-)  It may very well be unique to them.

>=20
> Thanks,
> Kathleen=20
>=20
> Sent from my iPhone
>=20
> On Oct 20, 2013, at 5:57 PM, "Cullen Jennings" <fluffy@iii.ca> wrote:
>=20
>>=20
>> I've been thinking about how to build cloud collaborations systems where=
 the data is encrypted and the cloud does not have the keys. Very intereste=
d in hearing others thoughts on how to do this.=20
>>=20
>> Near the end is a list of things that it would be helpful if the IETF st=
andardized.=20
>>=20
>> http://www.ietf.org/id/draft-jennings-perpass-secure-rai-cloud-00.pdf
>>=20
>> Cullen
>>=20
>> _______________________________________________
>> perpass mailing list
>> perpass@ietf.org
>> https://www.ietf.org/mailman/listinfo/perpass
>>=20



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From: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Thread-Topic: [perpass] draft agenda for Vancouver session
Thread-Index: AQHO0JePeBIA0dfItECQYi9DDtmW3ZoEN0QA
Date: Thu, 24 Oct 2013 14:07:05 +0000
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] draft agenda for Vancouver session
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On Oct 24, 2013, at 3:00 AM, Stephen Farrell <stephen.farrell@cs.tcd.ie>
 wrote:

>=20
>=20
> On 10/24/2013 06:47 AM, Cullen Jennings (fluffy) wrote:
>>=20
>> The biggest thing I would add to this Agenda is a discussion of
>> additional standards work the IETF could do to help the situtation.
>=20
> Fair point. That is the main goal of the session but
> I can make it clearer.

Sounds good - as long as that's the goal, I'm not worried about the agenda.=
 Changes looked fine.=20

Do you expect one of the slot to discuss building secure email systems, or =
IM, or collaboration? Would that be in PHB section?

(And I do realize how packed the agenda is here and that not everything wil=
l fit - I'm just trying to figure out what range of things is in scope)


>=20
> Also, the idea of Scott's slot towards the end is that
> he'll be building a summary/plan for things we should
> be doing as the meeting progresses and will pop that
> up near the end as about the last thing to discuss. Not
> minutes/action-items as such but more an attempt to
> capture exactly what you're after above as a plan.
>=20
> Cheers,
> S.
>=20
>>=20
>>=20
>> On Oct 21, 2013, at 9:48 AM, Stephen Farrell
>> <stephen.farrell@cs.tcd.ie> wrote:
>>=20
>>>=20
>>> Hi,
>>>=20
>>> I've posted a draft agenda [1] as previously outlined.
>>>=20
>>> Comments still welcome - folks are starting to make the various
>>> (small) bits of slideware so agenda-bash comments this week would
>>> be most useful.
>>>=20
>>> Thanks to Paul Wouters and Karen O'Donoghue for volunteering to
>>> scribe. One or two more might be useful - if you're up for it, just
>>> mail Sean and I.
>>>=20
>>> Ta, S.
>>>=20
>>> [1] https://datatracker.ietf.org/meeting/88/agenda/perpass/=20
>>> _______________________________________________ perpass mailing
>>> list perpass@ietf.org=20
>>> https://www.ietf.org/mailman/listinfo/perpass
>>=20
>> _______________________________________________ perpass mailing list=20
>> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
>>=20
>>=20


From stephen.farrell@cs.tcd.ie  Thu Oct 24 07:36:57 2013
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Subject: Re: [perpass] draft agenda for Vancouver session
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On 10/24/2013 03:07 PM, Cullen Jennings (fluffy) wrote:
> 
> On Oct 24, 2013, at 3:00 AM, Stephen Farrell
> <stephen.farrell@cs.tcd.ie> wrote:
> 
>> 
>> 
>> On 10/24/2013 06:47 AM, Cullen Jennings (fluffy) wrote:
>>> 
>>> The biggest thing I would add to this Agenda is a discussion of 
>>> additional standards work the IETF could do to help the
>>> situtation.
>> 
>> Fair point. That is the main goal of the session but I can make it
>> clearer.
> 
> Sounds good - as long as that's the goal, I'm not worried about the
> agenda. Changes looked fine.

Cool.

> Do you expect one of the slot to discuss building secure email
> systems, or IM, or collaboration? Would that be in PHB section?

Yep. Though it'll be ultra-brief in terms of presentation I'd
say. We don't want to aim to present or develop solutions during
the session (bet we can't resist trying though;-) but rather to
identify work that's tractable, that could make a difference
etc.

> (And I do realize how packed the agenda is here and that not
> everything will fit - I'm just trying to figure out what range of
> things is in scope)

If need be, Sean and I have kept the saag agenda light so we
have some time for follow-up there if that's needed. That's
on Thursday, same time (1300) same room (Regency D).

"What's in scope" is also in scope btw:-)

And of course if folks want to start threads on the list
in the meantime, esp for things they think should be in
scope but haven't been much discussed so far, that'd be
even better...

Cheers,
S.

> 
> 
>> 
>> Also, the idea of Scott's slot towards the end is that he'll be
>> building a summary/plan for things we should be doing as the
>> meeting progresses and will pop that up near the end as about the
>> last thing to discuss. Not minutes/action-items as such but more an
>> attempt to capture exactly what you're after above as a plan.
>> 
>> Cheers, S.
>> 
>>> 
>>> 
>>> On Oct 21, 2013, at 9:48 AM, Stephen Farrell 
>>> <stephen.farrell@cs.tcd.ie> wrote:
>>> 
>>>> 
>>>> Hi,
>>>> 
>>>> I've posted a draft agenda [1] as previously outlined.
>>>> 
>>>> Comments still welcome - folks are starting to make the
>>>> various (small) bits of slideware so agenda-bash comments this
>>>> week would be most useful.
>>>> 
>>>> Thanks to Paul Wouters and Karen O'Donoghue for volunteering
>>>> to scribe. One or two more might be useful - if you're up for
>>>> it, just mail Sean and I.
>>>> 
>>>> Ta, S.
>>>> 
>>>> [1] https://datatracker.ietf.org/meeting/88/agenda/perpass/ 
>>>> _______________________________________________ perpass
>>>> mailing list perpass@ietf.org 
>>>> https://www.ietf.org/mailman/listinfo/perpass
>>> 
>>> _______________________________________________ perpass mailing
>>> list perpass@ietf.org
>>> https://www.ietf.org/mailman/listinfo/perpass
>>> 
>>> 
> 
> _______________________________________________ perpass mailing list 
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
> 
> 

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Hi Paul,

On 10/23/13 5:22 PM, Paul Wouters wrote:
> The only defense against a "subpoena attack" is not outsourcing your
> end to end encryption. That's what we need to facilitate.
This overstates the case.  Unless you know the individual or site, you
must trust others.

On your other points, Hannes has written an excellent entrÃ© that starts
as an overview and will continue as an analysis.

Eliot

From rgb@tricolour.net  Thu Oct 24 06:36:33 2013
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From: Richard Guy Briggs <rgb@tricolour.net>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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On Thu, Oct 24, 2013 at 01:53:23AM +0100, Stephen Farrell wrote:
> On 10/24/2013 01:47 AM, Richard Barnes wrote:
> > I can sort of see the dogfood / Right Thing To Do argument.  But it seems
> > kind of silly to waste the bits / cycles encrypting things whose entire
> > point is to be public.
> 
> Not everything that goes in or out of ietf.org via
> SMTP is public. See ombudspersonage discussion for
> example. Or nomcom. For most lists, yes, this isn't
> much of a deal over and above dogfood consumption.

But the whole point of Opportunistic Encryption, which is essentially
what STARTTLS is about, is to encrypt as much of the traffic as possible
to discourage targetting any particular traffic for analysis.

This is why you might run a newsfeed through an IPsec link carrying more
sensitive traffic, so that the sheer volume makes it impractical to
decode or suspect it all.

> S
> 
> > --Richard
> > 
> >>> -Jim

	slainte mhath, RGB

--
Richard Guy Briggs               --  ~\    -- ~\            <hpv.tricolour.net>
<www.TriColour.net>                --  \___   o \@       @       Ride yer bike!
Ottawa, ON, CANADA                  --  Lo_>__M__\\/\%__\\/\%
Vote! -- <greenparty.ca>_____GTVS6#790__(*)__(*)________(*)(*)_________________

From ned+perpass@mrochek.com  Thu Oct 24 10:24:42 2013
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To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Cc: ned+perpass@mrochek.com, perpass <perpass@ietf.org>, Stephen Kent <kent@bbn.com>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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> Hiya,

> On 10/23/2013 07:30 PM, ned+perpass@mrochek.com wrote:
> >
> > Keeping in mind that this is hardly a comprehensive list of the world's
> > ISPs,

> Quite useful though. Thanks.

> > I'll first note that the ciphersuite situation is better than I expected.

> Ditto.

> > A
> > minority of services, albeit some of the biggest ones, prefer RC4. And
> > nobody
> > insisted on it. Quite a few even go so far as to prefer a DHE variant.
> > But more
> > of them need to support and prefer something in the DHE/AES set. This is
> > a place
> > where some clear guidance would probably be helpful, as long as it involves
> > using ciphersuites for which support is readily available. (The obvious
> > starting
> > point is for servers to always prefer AES to RC4 and always prefer DHE
> > variants
> > to non-DHE variants. I'll the ranking of those two to those more
> > pedantic than
> > I.)

> Any voluneteers? Might be close enough to fit in the smtp/tls
> draft Alexey said he'd look at.

> >
> > Only three of the services tested, one in North America and the others in
> > Europe, offered no SSL/TLS at all. That strikes me as pretty good coverage
> > overall, and perhaps the Snoden revelations will make something good
> > happen to
> > those, as it is doing at Yahoo.
> >
> > But these results, while encouraging, don't say anything good about the
> > IETF's
> > ability to mandate security. The IETF recommended best operational practice
> > (effectively a SHOULD in RFC 3501) is to only offer port 143 and require
> > STARTTLS on that port, as indicated by the LOGINDISABLED capability. Not a
> > single provider I tested implemented that specific variant. Not. One.

> Yep. I agree that's a problem. Seems we disagree about the
> conclusion to be drawn though. For me, the above indicates
> that our current "make 'em specify a MTI (in the RFC6919
> sense)" failed in this case.

It absolutely did fail, but because we screwed up and specified the wrong
thing. It absolutely escapes me how you can believe that putting a stronger
mandate for the wrong thing would have helped. The far more likely
result would have been more confusion and a overall poorer outcome.

What happened instead was both implementors and deployers of the technology did
the right thing IN SPITE OF OUR HAVING SCREWED UP. A "let's give implementors
and deployers even less leeway in the name of better security" change hardly
seems to be justified by these events.

> I conjecture that had there been a more-than-MTI practice in
> place way back then, its a good bit more likely we'd not have
> screwed up on the TLS stuff. And so I figure its worth
> investigating that some more. (Not for IMAP, but in general
> for current/future work.)

OK, if I understand you correctly, you're saying that had we demanded more back
then, we would have done a better job. Since I was there at the time and
remember the arguments and decisions quite well, it's easy to demonstate that
this conjecture does not stand up to any sort of analysis.

I first note that the main reason SSL/TLS was on the table was to protect 
passwords, not to protect entire mail sessions. The latter was a "nice to
have", not a "must have".

Nevertheless, the concern over password protection was serious. But there was
also serious concern that whatever was specified would be both implementable
and deployable. That concern was focused on clients - it was felt that the
number of combinations and permutations clients had to deal with needed to be
kept to an absolute minimum or client implementors wouldn't support any of it.
(This concern seems ridiculous now in light of the large number of IMAP
extensions that have specified since then and the resulting combinatoric
explosion that clients have to deal with.) 

On the server side, there was little if any concern expressed over
deployability at large scale. There was some concern expressed over export
restrictions. (Remember that this was happening in 1999-2002 and all this stuff
was in a state of flux.)

And then there was the feedback we were getting from the security area. We
were being told:

(1) Having any sort of clear text mechanism was bad, because there was
    tremendous skepticism that SSL/TLS would actually be deployed to
    protect password exchanges.

(2) Two port solutions are bad. If you're going to use SSL/TLS, it needed to
    be negotiated inband.

(3) GSSAPI/Kerberos was the path of truth and righteousness for password
    protection. There was reluctant acceptance that DIGEST-MD5 could be
    used, but not CRAM-MD5.

As a result of all these competing interests, what got specified was that
password needed to be protected and therefore it was mandatory to implement
either STARTTLS/PLAIN, DIGEST-MD5, or GSSAPI. Which was hardly a recipe for
interoperability. Rather, it was a reflection of the fact that we just didn't
know what the right solution was.

And at that point we got really, really lucky: Four separate IETF screwups
conspired to make the right thing happen: (1) DIGEST-MD5 was a total faiure,
(2) GSSAPI was seen as undeployable, (3) The negotiated one port solution for
SSL/TLS was undeployable, and (4) Our assessment of what implementors would be
willing and able to do was wildly incorrect.

Given this backdrop, I don't think a claim that demaning more security would
have led us to the correct two port SSL/TLS solution is remotely credible. Had
that happened it is *far* more likely we would have mandated DIGEST-MD5
support. But even if we'd moved in the SSL/TLS direction it would have
been a one port approach.

Of course if we were doing this now we wouldn't make the same mistakes. What
we'll do intead is make a great big bunch of new ones. Indeed, that is already
happening: See Paul Hoffman's recent message about how attempts to increase
SSL/TLS security is conspiring to lower its use in the field.

				Ned

From stephen.farrell@cs.tcd.ie  Thu Oct 24 10:36:41 2013
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Cc: perpass <perpass@ietf.org>, Stephen Kent <kent@bbn.com>
Subject: Re: [perpass] mandatory-to-implement vs. more?
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Hiya,

On 10/24/2013 03:53 AM, ned+perpass@mrochek.com wrote:
> 
> Of course if we were doing this now we wouldn't make the same mistakes. What
> we'll do intead is make a great big bunch of new ones.

Thanks for sticking with it. I now realise where we disagree.

I do think we've learned enough in the interim that we'd be
likely to get how to use TLS much closer to right for something
like IMAP today.

I don't doubt that we'll find lots of ways to make mistakes as
well of course, I just don't think they'd be in that area.

Cheers,
S.

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On 10/23/13 6:02 AM, Stephen Farrell wrote:
> 
> 
> On 10/23/2013 12:52 PM, Alexey Melnikov wrote:
>> Hi Stephen,
>> 
>> On 22/10/2013 17:46, Stephen Farrell wrote:
>>> Yep, that's a useful post - we shouldn't rush too much, but we
>>> do want to get things done so that developers and deployers
>>> have something to use.
>>> 
>>> I wonder what's the best way to proceed with this kind of
>>> stuff. I guess we want a BCP of some sort, but the question is
>>> how to handle the various different cases of foo-with-tls.
>>> 
>>> - Yaron did a generic TLS BCP draft. [1] - PSA did an XMPP TLS
>>> BCP draft [2] - This sounds like we might want an SMTP TLS BCP
>>> draft or perhaps to add text to [3], but that's aiming for 
>>> experimental and is just about using DANE.
>> I think some generic fallback rules can be protocol independent.
>> But needs of different protocols might be different. For example
>> backward compatibility with deployed TLS ciphers might be
>> different for XMPP and SMTP.
> 
> Sounds reasonable. I guess even if they have the same libraries the
> update cycles might differ. (Anyone know?)

I expect that the update cycles are indeed different.

I don't particularly *want* to have different BCPs for different
protocols, and personally I'd like to see as much commonality as
possible (with everyone pointing to Yaron's generic document).
However, there are some application-level differences (e.g., with
regard to session resumption) and each community (email, IM, web,
etc.) has had a different experience with the use of TLS, including
varying release schedules or willingness to release more often, use of
STARTTLS vs. separate ports, bigger or smaller networks, more or less
diverse developer community (e.g., with no one dominant implementation
or small set of implementations), client-to-server only communications
vs. also server-to-server federation, varying user expectations, etc.

>> I think SMTP TLS BCP would be a good idea. I think it should be 
>> independent of DANE, because of the status of the DANE document.
>> I would be happy to work on it (and would be happy to collaborate
>> with PSA to discuss similarities and differences).
> 
> Great. Let's talk in YVR about how to get that done so its a real
> BCP that gets followed in the wild. If someone else is up for
> helping I guess contact Alexey.

Before this thread emerged, I suggested the idea of having a chat
about this topic during the AppsArea session on Monday morning (and
BTW there are no SEC area sessions opposite). That might be a good
place to start.

Peter

- -- 
Peter Saint-Andre
https://stpeter.im/


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From envite@rolamasao.org  Thu Oct 24 11:04:32 2013
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Subject: [perpass] OpenPGP Server-side Signed E-mail [Was: e-mail security idea: server2server PGP]
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Hi all

The promised rough draft:

Initial Draft about OpenPGP Server-side Signed E-mail (OPSS e-mail)

Intent: To provide a method for server to server SMTP transmission that 
allows both
a) encryption
b) rejection before transmission of a message sent by an unauthenticated 
server

Throughout this work we will use “server” as the SMTP server intending 
to receive e-mail and “client” as the SMTP server trying to send a message.

How it works:
It will work as a standard, plaintext SMTP communication: client starts 
SMTP communication with HELO or EHLO. If client starts with HELO, server 
MUST assume that the client is not capable of authentication, but this 
is not the end of the protocol. If client starts with EHLO, server MUST 
announce OPSS as an available extension, then wait for client to confirm 
its usage. For a OPSS-enabled EHLO client, second command MUST be OPSS 
INIT. If it is, server will try to authenticate client, else server MUST 
assume that the client is not capable of authentication, but this is not 
the end of the protocol.

If a client is not capable of authentication, server MUST try to match 
HELO or EHLO node name with its internal list of known parties. If the 
match succeeds, it means that the server knows that the client hloud be 
able to do OPSS so server will reject the message with a 554 error 
before the message if transmitted and close connection.

If a client gives the OPSS INIT command, server will answer with 250 OK 
OPSS CHALLENGE and a printable random string. Client MUST give the OPSS 
RESPONSE command adding the ASCII-armored OpenPGP signature of the 
random string. Failure to do so means that server will reject the 
message with a 554 error before the message if transmitted and close 
connection. After OPSS RESPONSE server will opss-verify the signature 
(see procedure below) and if it is correct will follow the “Add host to 
known parties list” procedure (explained below) and answer with 250 OK 
OPSS OK announcing willingness to receive a message, while if the 
signature is not opss-verified server MUST reject the message with a 554 
error before the message if transmitted and close connection.

On this point a client MAY request the server's OpenPGP key (procedure 
below).

Now the client MUST do one of the following: MAY use the STARTTLS 
procedures, or MAY issue the OPSS ENCRYPT command. This command will be 
answered by a 250 OK message, after which point the entire commands and 
replies will be OpenPGP encrypted and signed.

How the client knows the server's OpenPGP key
There are four ways for doing this:
a) It is preloaded by the Administrator
b) It is downloaded from an OpenPGP keyserver before starting the 
communication
c) It is present on a DNS record for the server (this method is not 
covered by this document)
d) It is requested by the client on the fly

For requesting a key on the fly the client uses OPSS KEY command, which 
MUST be answered by the server with a 250 OK OPSS KEY answer and its own 
ASCII-armored OpenPGP key.

How the server knows the client's OpenPGP key
There are three ways for doing this:
a) It is preloaded by the Administrator
b) It is downloaded from an OpenPGP keyserver, out of band, while 
crafting, sending, receiving and checking the challenge-response.
c) It is present on a DNS record for the client (this method is not 
covered by this document) which is checked out of band while crafting, 
sending, receiving and checking the challenge-response.

Signature opss-verification procedure
Once the server has the signed response to the challenge, it will 
perform a standard OpenPGP verification (OpenPGP verification is one 
step of OPSS verification). If this fails, the verification fails. If it 
succeeds, server will match the EHLO node name againts its known parties 
list.
If it is found as “verified”, server will check the key also stored 
there against the one used for the response, and if they match, 
verification succeeds and message will be accepted, otherwise 
verification fails and message will not be accepted.
If it is found as “non-verified”, server MAY update the key from an 
OpenPGP keyserver in order to check if further signatures on it makes it 
verified. Anycase verification succeeds and message will be accepted. 
Server MAY also check the key also stored in the known parties list 
against the one used for the response, and add a 
X-OPSS-Signature-not-verified header to the message before delivering it.
Key update from a keyserver may also bring as revoked a previously 
verified signature, or may bring a different key for the same client.

Known parties list maintenance
Administrator can add pairs of EHLO node name-OpenPGP key to the list by 
hand. Also, any new key detected from OPSS RESPONSE commands will be 
added to the list together with the corresponding EHLO node name by 
using the “Add host to known parties list” procedure (explained below). 
If the server tries to update a key from a keyserver and finds a new 
key, this will be added as well, together with the corresponding EHLO 
node name.
A node name-key pair can have one of two statuses: verified and 
non-verified. Verified means that the server administrator manually 
choosed this, or that the trust on the keys signing it justifies to do so.
A node with a verified key can appear only once on the known parties 
list, but a node can have several non-verified keys on it, all of them 
valid.

Add host to known parties list procedure
When a server receives an OPSS RESPONSE command, it must check its 
correpsonding node name on the known parties list. If found as 
“Verified”, it does nothing. If found as “non-verified”, server adds the 
pair node name-key to the list without removing the already present 
pair. If not found, it just adds the pair node name-key to the list.

Web of Trust
The administrator can manually assign a trust level to each key, even 
keys that have an empty node name. Procedures for this are standard 
OpenPGP. If the configured amount of keys with the correct trust level 
are signing a key, that key will be considered verified without manual 
administrator intervention. Security note: An administrator should only 
assign trust to keys belonging to people or server he positively knows 
are conscious of the security implications of signing a key.

Key format
Keys will be standard OpenPGP keys with a corresponding e-mail address 
of OPSS_e-mail@[nodename]

X-OPSS-Signature-not-verified header
A server MAY add this header for a non-verified signature. Format is one of:
X-OPSS-Signature-not-verified: Not found [nodename]
X-OPSS-Signature-not-verified: Key found for [nodename], [key]
X-OPSS-Signature-not-verified: Several keys found for [nodename], [key used]
These can be used for MUA spam checking.

Regards
Noel
er Envite

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From: Ted Hardie <ted.ietf@gmail.com>
To: Peter Saint-Andre <stpeter@stpeter.im>
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Subject: Re: [perpass] Hasty PRISM proofing considered harmful
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On Thu, Oct 24, 2013 at 11:03 AM, Peter Saint-Andre <stpeter@stpeter.im>wrote:

>
> >> I think SMTP TLS BCP would be a good idea. I think it should be
> >> independent of DANE, because of the status of the DANE document.
> >> I would be happy to work on it (and would be happy to collaborate
> >> with PSA to discuss similarities and differences).
> >
> > Great. Let's talk in YVR about how to get that done so its a real
> > BCP that gets followed in the wild. If someone else is up for
> > helping I guess contact Alexey.
>
> Before this thread emerged, I suggested the idea of having a chat
> about this topic during the AppsArea session on Monday morning (and
> BTW there are no SEC area sessions opposite). That might be a good
> place to start.
>
>
Are you thinking of this in terms of MSAs in the RFC 6409 sense, as well as
MTAs?   Though SMTP is used for both, the usefulness of things like DANE is
likely to be different in the different contexts.

That hints, unfortunately, that there is a strong possibility that the best
current practice may be best specified in relation to a specific use of a
protocol rather than generally to the protocol.

regards,

Ted



> Peter
>
> - --
> Peter Saint-Andre
> https://stpeter.im/
>
>

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<div dir=3D"ltr">On Thu, Oct 24, 2013 at 11:03 AM, Peter Saint-Andre <span =
dir=3D"ltr">&lt;<a href=3D"mailto:stpeter@stpeter.im" target=3D"_blank">stp=
eter@stpeter.im</a>&gt;</span> wrote:<br><div class=3D"gmail_extra"><div cl=
ass=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><br><div class=3D"im">
&gt;&gt; I think SMTP TLS BCP would be a good idea. I think it should be<br=
>
&gt;&gt; independent of DANE, because of the status of the DANE document.<b=
r>
&gt;&gt; I would be happy to work on it (and would be happy to collaborate<=
br>
&gt;&gt; with PSA to discuss similarities and differences).<br>
&gt;<br>
&gt; Great. Let&#39;s talk in YVR about how to get that done so its a real<=
br>
&gt; BCP that gets followed in the wild. If someone else is up for<br>
&gt; helping I guess contact Alexey.<br>
<br>
</div>Before this thread emerged, I suggested the idea of having a chat<br>
about this topic during the AppsArea session on Monday morning (and<br>
BTW there are no SEC area sessions opposite). That might be a good<br>
place to start.<br>
<br></blockquote><div><br></div><div>Are you thinking of this in terms of M=
SAs in the RFC 6409 sense, as well as MTAs?=A0=A0 Though SMTP is used for b=
oth, the usefulness of things like DANE is likely to be different in the di=
fferent contexts.<br>
<br></div><div>That hints, unfortunately, that there is a strong possibilit=
y that the best current practice may be best specified in relation to a spe=
cific use of a protocol rather than generally to the protocol.<br><br></div=
>
<div>regards,<br><br>Ted<br></div><div><br>=A0</div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">
Peter<br>
<br>
- --<br>
Peter Saint-Andre<br>
<a href=3D"https://stpeter.im/" target=3D"_blank">https://stpeter.im/</a><b=
r>
<br></blockquote></div><br></div></div>

--047d7bd76bb23902a204e981d928--

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Subject: Re: [perpass] Hasty PRISM proofing considered harmful
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On 10/24/13 1:43 PM, Ted Hardie wrote:
> On Thu, Oct 24, 2013 at 11:03 AM, Peter Saint-Andre
> <stpeter@stpeter.im <mailto:stpeter@stpeter.im>> wrote:
> 
> 
>>> I think SMTP TLS BCP would be a good idea. I think it should
>>> be independent of DANE, because of the status of the DANE
>>> document. I would be happy to work on it (and would be happy to
>>> collaborate with PSA to discuss similarities and differences).
>> 
>> Great. Let's talk in YVR about how to get that done so its a
>> real BCP that gets followed in the wild. If someone else is up
>> for helping I guess contact Alexey.
> 
> Before this thread emerged, I suggested the idea of having a chat 
> about this topic during the AppsArea session on Monday morning
> (and BTW there are no SEC area sessions opposite). That might be a
> good place to start.
> 
> 
> Are you thinking of this in terms of MSAs in the RFC 6409 sense, as
> well as MTAs?

I'm thinking about what Keith Moore posted in draft-moore-email-tls.
So yes, MSAs in the RFC 6409 sense (but also covering IMAP and POP).

> Though SMTP is used for both, the usefulness of things like DANE is
> likely to be different in the different contexts.
> 
> That hints, unfortunately, that there is a strong possibility that
> the best current practice may be best specified in relation to a
> specific use of a protocol rather than generally to the protocol.

So it seems.

We all need to up our game, but each of us might need to do so in
different ways.

Peter

- -- 
Peter Saint-Andre
https://stpeter.im/


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From sm@resistor.net  Thu Oct 24 16:53:55 2013
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Hello,

 From 
http://engineering.linkedin.com/mobile/linkedin-intro-doing-impossible-ios

   "Similarly, Intro's approach of proxying IMAP is a novel way of delivering
    software to users. It operates at the limit of what is 
technically possible,
    but it has a big advantage: we can enhance the apps you already use."

What is technical possible is not always a good idea.  This is a 
matter of personal opinion.

Regards,
-sm


From ned+perpass@mrochek.com  Thu Oct 24 19:23:50 2013
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From: ned+perpass@mrochek.com
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In-reply-to: "Your message dated Thu, 24 Oct 2013 12:43:31 -0700" <CA+9kkMAVP4sW6_fQc5rvzS8zomcvyz5hddM7Hobbw+MMC7y1Ew@mail.gmail.com>
References: <CAPik8yaKaXRm3t3sepRHAFADCnOmdPjQC5-be3a8Xsr29965BQ@mail.gmail.com> <5266AC02.80506@cs.tcd.ie> <5267B862.6000105@isode.com> <5267BAD9.8070702@cs.tcd.ie> <526960FF.3050902@stpeter.im> <CA+9kkMAVP4sW6_fQc5rvzS8zomcvyz5hddM7Hobbw+MMC7y1Ew@mail.gmail.com>
To: Ted Hardie <ted.ietf@gmail.com>
Cc: Salvatore Loreto <salvatore.loreto@ericsson.com>, Alexey Melnikov <alexey.melnikov@isode.com>, "<perpass@ietf.org>" <perpass@ietf.org>, Peter Saint-Andre <stpeter@stpeter.im>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] Hasty PRISM proofing considered harmful
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> On Thu, Oct 24, 2013 at 11:03 AM, Peter Saint-Andre <stpeter@stpeter.im>wrote:

> >
> > >> I think SMTP TLS BCP would be a good idea. I think it should be
> > >> independent of DANE, because of the status of the DANE document.
> > >> I would be happy to work on it (and would be happy to collaborate
> > >> with PSA to discuss similarities and differences).
> > >
> > > Great. Let's talk in YVR about how to get that done so its a real
> > > BCP that gets followed in the wild. If someone else is up for
> > > helping I guess contact Alexey.
> >
> > Before this thread emerged, I suggested the idea of having a chat
> > about this topic during the AppsArea session on Monday morning (and
> > BTW there are no SEC area sessions opposite). That might be a good
> > place to start.
> >
> >
> Are you thinking of this in terms of MSAs in the RFC 6409 sense, as well as
> MTAs?   Though SMTP is used for both, the usefulness of things like DANE is
> likely to be different in the different contexts.

Quite right. SUBMIT is best thought of as a separate protocol that happens to
share a lot of syntax and semantics with SMTP. And I'd say the utility is
certain to be different. (I hope we don't have to go through the same
discussion we've just had regarding IMAP for SUBMIT.)

> That hints, unfortunately, that there is a strong possibility that the best
> current practice may be best specified in relation to a specific use of a
> protocol rather than generally to the protocol.

Agreed.

				Ned

From huitema@huitema.net  Thu Oct 24 22:23:31 2013
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Cc: 'Noel Torres' <envite@rolamasao.org>, perpass@ietf.org
Subject: Re: [perpass] e-mail security idea: server2server PGP
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> Please terminate this sub-thread.  It has many years of wasted history =

> on many mailing lists.
>=20
> Really.  The script this thread will follow has been run so many =
times,=20
> the pages are tattered.

Dave, I am well aware of past discussions, but something has changed. We =
can
certainly agree that server-to-server encryption is not the best way to
provide end-to-end authentication or confidentiality of messages.=20

However, if I was running a spying system and if I was in the business =
of
collecting meta-data, I would love looking at unencrypted SMTP traffic.
Suppose that I tap  a number of big Internet pipe, at exchanges or on =
the
path to big servers. I can filter out the SMTP traffic with not much =
effort.
Even if the poor schmucks are using PGP or S-MIME, I will be able to =
read
the entire set of RFC-822 headers in clear-text. I can use that to =
create a
database of who sends e-mail to whom, and pretty soon I will have a good
idea of the "social network."

If I was running such a system, I would hate to see SMTP traffic =
becoming
encrypted.=20

In the past, we did not suspect that someone would run such a system. We
were probably na=EFve.=20

-- Christian Huitema



From hannes.tschofenig@gmx.net  Fri Oct 25 00:58:22 2013
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Subject: Re: [perpass] Standards in the age of pervasive suspicion
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On 10/23/2013 08:31 PM, Joseph Lorenzo Hall wrote:
> NIST appears to have learned from this that the standardization
> process has to be equally as transparent as the
> competition/cryptanalysis process. That's a very good thing.

There is still something to learn for NIST when it comes to good 
standardization principles, such as those outlined by OpenStand
http://open-stand.org/principles/

I am sure you have seen the related post from the IAB on this topic:
http://www.iab.org/2013/10/23/comments-from-the-iab-on-nist-sp-800-90a-proceeding/

But it would be unfair to just complain about NIST when many other 
government bodies aren't any better. I will share one story I 
experienced recently with the European Commission (EC) created Network 
and Information Security (NIS) platform. This group was created in 
response to the proposed regulation on CyberSecurity by the EC.

The responsible persons from the EC decided to organize a f2f meeting 
early June to get their work started. Around 150 persons from all 
sectors in the industry showed up to the meeting (mostly from bigger 
cooperations who have public policy people in Brussels) since the 
meeting was announced short notice.

The meeting was lead by Giuseppe Abbamonte and he ran the meeting in the 
style expressed at their webpage: "the Commission will select the 
platform participants, with a view to ensuring a balanced and manageable 
representation of the different stakeholders."

At the end of the meeting he came up with the idea that there should be 
3 groups with maximum 20 persons each and he will nominate the persons 
for those groups.

I dared to suggest to follow a model like in the IETF with open 
participation. He shouted at me and said that this will never happen. 
The argument was that this has never worked in the EC so far.

Of course the folks in the participating people in the room quickly 
noticed that 3x20 by no means leads to 150 and so more than half of the 
participants of the f2f meeting wouldn't be allowed to participate in 
the work. (I ignore those who weren't able to show up at the f2f meeting 
or smaller enterprises who don't have the budget to fly to Brussels just 
to chat.) I am sure most of them had no expectation that it would lead 
to something useful but they at least wanted to follow it and jump it 
when it completely goes into the wrong direction.

An hour later the model was changed and larger groups were allowed; 
that's still far away from an IETF type of participation style.

These are the types of groups who are supposed to develop solutions to 
improve the security of the Internet.

Ciao
Hannes



From dhc@dcrocker.net  Fri Oct 25 04:28:58 2013
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Date: Fri, 25 Oct 2013 07:28:36 -0400
From: Dave Crocker <dhc@dcrocker.net>
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Cc: 'Noel Torres' <envite@rolamasao.org>, perpass@ietf.org
Subject: Re: [perpass] e-mail security idea: server2server PGP
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On 10/25/2013 1:23 AM, Christian Huitema wrote:
>> Please terminate this sub-thread.  It has many years of wasted
>> history on many mailing lists.
>>
>> Really.  The script this thread will follow has been run so many
>> times, the pages are tattered.
>
> Dave, I am well aware of past discussions, but something has
> changed. We can certainly agree that server-to-server encryption is
> not the best way to provide end-to-end authentication or
> confidentiality of messages.
>
> However, if I was running a spying system and if I was in the
> business of collecting meta-data, I would love looking at
> unencrypted SMTP traffic.

Christian,

I apologize for being ambiguous.  The "sub-thread" I meant was the
sole-sourced, compulsive attacks on DKIM.  I left the specific reference
off in an attempt to trigger yet-another round of attacks...  sigh.


FWIW, I think "link" (that is, lower transfer layer) encryption is just
fine, much like washing one's hands is good hygiene.

The fact that it won't really provide protection against most/all of the
actual attacks we've been seeing or hearing about doesn't mean we
shouldn't do it, for at least the reason you cite.

But of course it does mean we also need to look at things more broadly, 
for the additional mechanisms that will cover current, typical attacks.


d/
-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

From rutkowski.tony@gmail.com  Fri Oct 25 05:40:13 2013
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Date: Fri, 25 Oct 2013 08:40:10 -0400
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Cc: perpass <perpass@ietf.org>
Subject: [perpass] ITU-T 's anti-perpass work
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This is a multi-part message in MIME format.
--------------090009060304010404030708
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Hi Steve,

As fate has it, the ITU-T is meeting
in Kampala at about the same time as
the IETF meeting.  On its agenda, it
has some "anti-perpass" contributions
shown below that were just submitted.

The ITU-T - IETF cooperation agreement
provides both access to these materials
as well as an ability to comment.  Perpass
might wish to consider providing comment.

--tony

Number 	Received 	Source 	Title 	Questions
[ 370 r1] 	22-Oct-13 	Korea Electronics and Telecommunications Research 
Institute (ETRI) 	Survey and proposal of Big data definition for 
Y.BigData-reqts 	Q17/13
[ 426 ] 	23-Oct-13 	China Telecommunications Corporation 	Proposal about 
benefits of Big Data in Y.Bigdata-reqts 	Q17/13
[ 427 ] 	23-Oct-13 	China Telecommunications Corporation 	Proposal about 
definition and characteristics of Big Data in Y.Bigdata-reqts 	Q17/13
[ 428 ] 	23-Oct-13 	China Telecommunications Corporation 	Proposal about 
the relationship between cloud computing and big data in 
Y.Bigdata-reqts 	Q17/13
[ 430 ] 	24-Oct-13 	TELEKOMUNIKACJA POLSKA S.A. 	Areas of cloud 
computing support for big data 	Q17/13



--------------090009060304010404030708
Content-Type: text/html; charset=ISO-8859-1
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<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Hi Steve,<br>
    <br>
    As fate has it, the ITU-T is meeting<br>
    in Kampala at about the same time as<br>
    the IETF meeting.&nbsp; On its agenda, it<br>
    has some "anti-perpass" contributions<br>
    shown below that were just submitted.<br>
    <br>
    The ITU-T - IETF cooperation agreement<br>
    provides both access to these materials<br>
    as well as an ability to comment.&nbsp; Perpass<br>
    might wish to consider providing comment.<br>
    <br>
    --tony<br>
    <br>
    <table style="border-collapse: collapse;width:593pt" cellpadding="0"
      cellspacing="0" border="0" width="791">
      <colgroup><col
          style="mso-width-source:userset;mso-width-alt:2048;width:42pt"
          width="56"> <col
          style="mso-width-source:userset;mso-width-alt:2377;width:49pt"
          width="65"> <col
          style="mso-width-source:userset;mso-width-alt:5961;width:122pt"
          width="163"> <col
          style="mso-width-source:userset;mso-width-alt:16201;width:332pt"
          width="443"> <col style="width:48pt" width="64"> </colgroup><tbody>
        <tr style="height:12.0pt" height="16">
          <td class="xl63" style="height:12.0pt;width:42pt" height="16"
            width="56">Number&nbsp;</td>
          <td class="xl64" style="width:49pt" width="65">Received</td>
          <td class="xl63" style="width:122pt" width="163">Source</td>
          <td class="xl63" style="width:332pt" width="443">Title</td>
          <td class="xl63" style="width:48pt" width="64">Questions</td>
        </tr>
        <tr style="height:36.0pt" height="48">
          <td class="xl65" style="height:36.0pt;width:42pt" height="48"
            width="56">[ 370 r1] &nbsp;</td>
          <td class="xl66" style="width:49pt" align="right" width="65">22-Oct-13</td>
          <td class="xl65" style="width:122pt" width="163">Korea
            Electronics and Telecommunications Research Institute (ETRI)
            &nbsp;</td>
          <td class="xl65" style="width:332pt" width="443">Survey and
            proposal of Big data definition for Y.BigData-reqts &nbsp; &nbsp;</td>
          <td class="xl65" style="width:48pt" width="64">Q17/13 &nbsp;</td>
        </tr>
        <tr style="height:24.0pt" height="32">
          <td class="xl65" style="height:24.0pt;width:42pt" height="32"
            width="56">[ 426 ] &nbsp;</td>
          <td class="xl66" style="width:49pt" align="right" width="65">23-Oct-13</td>
          <td class="xl65" style="width:122pt" width="163">China
            Telecommunications Corporation &nbsp;</td>
          <td class="xl65" style="width:332pt" width="443">Proposal
            about benefits of Big Data in Y.Bigdata-reqts &nbsp; &nbsp;</td>
          <td class="xl65" style="width:48pt" width="64">Q17/13 &nbsp;</td>
        </tr>
        <tr style="height:24.0pt" height="32">
          <td class="xl65" style="height:24.0pt;width:42pt" height="32"
            width="56">[ 427 ] &nbsp;</td>
          <td class="xl66" style="width:49pt" align="right" width="65">23-Oct-13</td>
          <td class="xl65" style="width:122pt" width="163">China
            Telecommunications Corporation &nbsp;</td>
          <td class="xl65" style="width:332pt" width="443">Proposal
            about definition and characteristics of Big Data in
            Y.Bigdata-reqts &nbsp; &nbsp;</td>
          <td class="xl65" style="width:48pt" width="64">Q17/13 &nbsp;</td>
        </tr>
        <tr style="height:24.0pt" height="32">
          <td class="xl65" style="height:24.0pt;width:42pt" height="32"
            width="56">[ 428 ] &nbsp;</td>
          <td class="xl66" style="width:49pt" align="right" width="65">23-Oct-13</td>
          <td class="xl65" style="width:122pt" width="163">China
            Telecommunications Corporation &nbsp;</td>
          <td class="xl65" style="width:332pt" width="443">Proposal
            about the relationship between cloud computing and big data
            in Y.Bigdata-reqts &nbsp; &nbsp;</td>
          <td class="xl65" style="width:48pt" width="64">Q17/13 &nbsp;</td>
        </tr>
        <tr style="height:24.0pt" height="32">
          <td class="xl65" style="height:24.0pt;width:42pt" height="32"
            width="56">[ 430 ] &nbsp;</td>
          <td class="xl66" style="width:49pt" align="right" width="65">24-Oct-13</td>
          <td class="xl65" style="width:122pt" width="163">TELEKOMUNIKACJA
            POLSKA S.A. &nbsp;</td>
          <td class="xl65" style="width:332pt" width="443">Areas of
            cloud computing support for big data &nbsp; &nbsp;</td>
          <td class="xl65" style="width:48pt" width="64">Q17/13 &nbsp;</td>
        </tr>
      </tbody>
    </table>
    <br>
  </body>
</html>

--------------090009060304010404030708--

From dhc@dcrocker.net  Fri Oct 25 06:33:05 2013
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Subject: Re: [perpass] ITU-T 's anti-perpass work
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On 10/25/2013 8:40 AM, Tony Rutkowski wrote:
> On its agenda, it
> has some "anti-perpass" contributions
> shown below that were just submitted.



Tony,

Please provide some detail, to explain how these contributions are 
anti-perpass.

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

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To: Hannes Tschofenig <hannes.tschofenig@gmx.net>, Joseph Lorenzo Hall <joe@cdt.org>, Stephen Kent <kent@bbn.com>, perpass <perpass@ietf.org>
Date: Fri, 25 Oct 2013 09:51:26 -0400
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Subject: Re: [perpass] Standards in the age of pervasive suspicion
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As the final expert reviewer on a fairly recent NIST publication (about 1 y=
ear ago), I will attest to their good practices.  They do work on standards=
 collaboratively, take open calls for feedback and then provide responses t=
o those who comment.

I wound up reading the document 5 different times, providing feedback in ea=
ch instance that was typically accepted and all responses were reasonable. =
 They do make an effort to find an expert in the area of the standard publi=
cation as well.

I did not read the full thread, so sorry if any of this was out-of-context,=
 but I thought the first-hand experience and their use of a final external =
reviewer might be helpful for some to understand.

Best regards,
Kathleen=20

-----Original Message-----
From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf =
Of Hannes Tschofenig
Sent: Friday, October 25, 2013 3:59 AM
To: Joseph Lorenzo Hall; Stephen Kent; perpass
Subject: Re: [perpass] Standards in the age of pervasive suspicion

On 10/23/2013 08:31 PM, Joseph Lorenzo Hall wrote:
> NIST appears to have learned from this that the standardization=20
> process has to be equally as transparent as the=20
> competition/cryptanalysis process. That's a very good thing.

There is still something to learn for NIST when it comes to good standardiz=
ation principles, such as those outlined by OpenStand http://open-stand.org=
/principles/

I am sure you have seen the related post from the IAB on this topic:
http://www.iab.org/2013/10/23/comments-from-the-iab-on-nist-sp-800-90a-proc=
eeding/

But it would be unfair to just complain about NIST when many other governme=
nt bodies aren't any better. I will share one story I experienced recently =
with the European Commission (EC) created Network and Information Security =
(NIS) platform. This group was created in response to the proposed regulati=
on on CyberSecurity by the EC.

The responsible persons from the EC decided to organize a f2f meeting early=
 June to get their work started. Around 150 persons from all sectors in the=
 industry showed up to the meeting (mostly from bigger cooperations who hav=
e public policy people in Brussels) since the meeting was announced short n=
otice.

The meeting was lead by Giuseppe Abbamonte and he ran the meeting in the st=
yle expressed at their webpage: "the Commission will select the platform pa=
rticipants, with a view to ensuring a balanced and manageable representatio=
n of the different stakeholders."

At the end of the meeting he came up with the idea that there should be
3 groups with maximum 20 persons each and he will nominate the persons for =
those groups.

I dared to suggest to follow a model like in the IETF with open participati=
on. He shouted at me and said that this will never happen.=20
The argument was that this has never worked in the EC so far.

Of course the folks in the participating people in the room quickly noticed=
 that 3x20 by no means leads to 150 and so more than half of the participan=
ts of the f2f meeting wouldn't be allowed to participate in the work. (I ig=
nore those who weren't able to show up at the f2f meeting or smaller enterp=
rises who don't have the budget to fly to Brussels just to chat.) I am sure=
 most of them had no expectation that it would lead to something useful but=
 they at least wanted to follow it and jump it when it completely goes into=
 the wrong direction.

An hour later the model was changed and larger groups were allowed; that's =
still far away from an IETF type of participation style.

These are the types of groups who are supposed to develop solutions to impr=
ove the security of the Internet.

Ciao
Hannes


_______________________________________________
perpass mailing list
perpass@ietf.org
https://www.ietf.org/mailman/listinfo/perpass


From hannes.tschofenig@gmx.net  Fri Oct 25 07:31:00 2013
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Date: Fri, 25 Oct 2013 16:31:06 +0200
From: Hannes Tschofenig <hannes.tschofenig@gmx.net>
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Subject: Re: [perpass] Standards in the age of pervasive suspicion
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Hi Kathleen,

in my mail below I had shared one example of how the process in other 
parts of the world look like and actually defended NIST to a certain 
extend.

However, I had some experience with NIST myself, for example with the 
NSTIC work. I am sure there are other on the list who have had 
experience with other initiatives, such as the SmartGrid.

Take your experience described below and compare it with the IETF. Have 
your comments been published somewhere and are they accessible to the 
public? What is the decision process for incorporating comments from 
different sources? What is the dispute resolution process?

Ciao
Hannes

On 10/25/2013 03:51 PM, Moriarty, Kathleen wrote:
> As the final expert reviewer on a fairly recent NIST publication
> (about 1 year ago), I will attest to their good practices.  They do
> work on standards collaboratively, take open calls for feedback and
> then provide responses to those who comment.
>
> I wound up reading the document 5 different times, providing feedback
> in each instance that was typically accepted and all responses were
> reasonable.  They do make an effort to find an expert in the area of
> the standard publication as well.
>
> I did not read the full thread, so sorry if any of this was
> out-of-context, but I thought the first-hand experience and their use
> of a final external reviewer might be helpful for some to
> understand.
>
> Best regards, Kathleen
>
> -----Original Message----- From: perpass-bounces@ietf.org
> [mailto:perpass-bounces@ietf.org] On Behalf Of Hannes Tschofenig
> Sent: Friday, October 25, 2013 3:59 AM To: Joseph Lorenzo Hall;
> Stephen Kent; perpass Subject: Re: [perpass] Standards in the age of
> pervasive suspicion
>
> On 10/23/2013 08:31 PM, Joseph Lorenzo Hall wrote:
>> NIST appears to have learned from this that the standardization
>> process has to be equally as transparent as the
>> competition/cryptanalysis process. That's a very good thing.
>
> There is still something to learn for NIST when it comes to good
> standardization principles, such as those outlined by OpenStand
> http://open-stand.org/principles/
>
> I am sure you have seen the related post from the IAB on this topic:
> http://www.iab.org/2013/10/23/comments-from-the-iab-on-nist-sp-800-90a-proceeding/
>
>  But it would be unfair to just complain about NIST when many other
> government bodies aren't any better. I will share one story I
> experienced recently with the European Commission (EC) created
> Network and Information Security (NIS) platform. This group was
> created in response to the proposed regulation on CyberSecurity by
> the EC.
>
> The responsible persons from the EC decided to organize a f2f meeting
> early June to get their work started. Around 150 persons from all
> sectors in the industry showed up to the meeting (mostly from bigger
> cooperations who have public policy people in Brussels) since the
> meeting was announced short notice.
>
> The meeting was lead by Giuseppe Abbamonte and he ran the meeting in
> the style expressed at their webpage: "the Commission will select the
> platform participants, with a view to ensuring a balanced and
> manageable representation of the different stakeholders."
>
> At the end of the meeting he came up with the idea that there should
> be 3 groups with maximum 20 persons each and he will nominate the
> persons for those groups.
>
> I dared to suggest to follow a model like in the IETF with open
> participation. He shouted at me and said that this will never
> happen. The argument was that this has never worked in the EC so
> far.
>
> Of course the folks in the participating people in the room quickly
> noticed that 3x20 by no means leads to 150 and so more than half of
> the participants of the f2f meeting wouldn't be allowed to
> participate in the work. (I ignore those who weren't able to show up
> at the f2f meeting or smaller enterprises who don't have the budget
> to fly to Brussels just to chat.) I am sure most of them had no
> expectation that it would lead to something useful but they at least
> wanted to follow it and jump it when it completely goes into the
> wrong direction.
>
> An hour later the model was changed and larger groups were allowed;
> that's still far away from an IETF type of participation style.
>
> These are the types of groups who are supposed to develop solutions
> to improve the security of the Internet.
>
> Ciao Hannes
>
>
> _______________________________________________ perpass mailing list
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
>
> _______________________________________________ perpass mailing list
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
>


From rutkowski.tony@gmail.com  Fri Oct 25 07:35:37 2013
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From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] ITU-T 's anti-perpass work
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This is a multi-part message in MIME format.
--------------030709060406040307040302
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
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On 10/25/2013 9:32 AM, Dave Crocker wrote:
> Please provide some detail, to explain how these contributions are 
> anti-perpass. 

Hi Dave,

The term "anti-perpass" was used to
described a significant initiative
begun in the ITU-T last year to
develop a set of Recommendations in
its Study Group 13 (essentially Internet
and Cloud Computing) to Hoover up,
store, and analyze everything passing
through the networks.

The proponents (China Unicom, the China
Information Ministry, ZTE, and ETRI)
argued argued that "Over the Top"
providers were capturing and
using information about "their"
telco customer to their detriment
and instituted a Big Data project.
The work included coupling to the
many new DPI standards being developed
in the same Study Group.

The ITU-T today is predominantly a forum
for China, Korea ETRI, and Japan.  However
some governments intervened to suggest this
work was not a good thing.  An exacerbating
factor is that 89 nations last year signed
an ITU treaty obligating themselves to
implement ITU-T Recommendations.  The work
was temporarily halted early this year
because of the interventions, but with the
Kampala meeting, it is now scaling up again
with these documents.

The IETF could perhaps help here by offering
critical comment that having global ITU
Recommendations that promote if not mandate
pervasive surveillance and analysis of
individual users is not a good thing.
The attached documents are exemplary.

--tony

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////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////8AOAVL
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gHRSTlP/////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
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From kathleen.moriarty@emc.com  Fri Oct 25 07:47:51 2013
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From: "Moriarty, Kathleen" <kathleen.moriarty@emc.com>
To: Hannes Tschofenig <hannes.tschofenig@gmx.net>, Joseph Lorenzo Hall <joe@cdt.org>, Stephen Kent <kent@bbn.com>, perpass <perpass@ietf.org>
Date: Fri, 25 Oct 2013 10:46:48 -0400
Thread-Topic: [perpass] Standards in the age of pervasive suspicion
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References: <CAMm+LwiDGDDOpWGq=2GePUjwE00U_HgFzakdPOgQKGYN3=qGpA@mail.gmail.com> <5265FB71.1020408@cisco.com>	<526617D2.5060903@gmx.net> <6.2.5.6.2.20131021232826.0dbc9530@resistor.net>	<5267E076.5010700@bbn.com> <21D6C0EE-0C10-4DC9-ADD6-A6CFA212D163@icsi	<526815F0.8020100@cdt.org> <526A24AD.8000107@gmx.net> <F5063677821E3B4F81ACFB7905573F24049EA32CF5@MX15A.corp.emc.com> <526A80AA.3080504@gmx.net>
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Subject: Re: [perpass] Standards in the age of pervasive suspicion
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Hi Hannes,

Good point, the comments as an expert reviewer were not published, nor was =
the response.  However in the development of the framework from the Cyber S=
ecurity Executive order, NIST did publish all of the contributions.  I was =
heavily involved in that for EMC, although I did not have time to attend th=
e workshops that followed.

Responses, I believe, just go directly to the submitter.  We, as a company,=
 have had comments rejected (different document) and have submitted them ag=
ain for subsequent revisions of the documents.  The explanations were reaso=
nable, although we didn't necessarily agree and the instance I am referring=
 to is not something that would cause a security concern.

The IETF's level of transparency exceeds many other standards development o=
rganizations.

Thanks,
Kathleen

-----Original Message-----
From: Hannes Tschofenig [mailto:hannes.tschofenig@gmx.net]=20
Sent: Friday, October 25, 2013 10:31 AM
To: Moriarty, Kathleen; Joseph Lorenzo Hall; Stephen Kent; perpass
Subject: Re: [perpass] Standards in the age of pervasive suspicion

Hi Kathleen,

in my mail below I had shared one example of how the process in other parts=
 of the world look like and actually defended NIST to a certain extend.

However, I had some experience with NIST myself, for example with the NSTIC=
 work. I am sure there are other on the list who have had experience with o=
ther initiatives, such as the SmartGrid.

Take your experience described below and compare it with the IETF. Have you=
r comments been published somewhere and are they accessible to the public? =
What is the decision process for incorporating comments from different sour=
ces? What is the dispute resolution process?

Ciao
Hannes

On 10/25/2013 03:51 PM, Moriarty, Kathleen wrote:
> As the final expert reviewer on a fairly recent NIST publication=20
> (about 1 year ago), I will attest to their good practices.  They do=20
> work on standards collaboratively, take open calls for feedback and=20
> then provide responses to those who comment.
>
> I wound up reading the document 5 different times, providing feedback=20
> in each instance that was typically accepted and all responses were=20
> reasonable.  They do make an effort to find an expert in the area of=20
> the standard publication as well.
>
> I did not read the full thread, so sorry if any of this was=20
> out-of-context, but I thought the first-hand experience and their use=20
> of a final external reviewer might be helpful for some to understand.
>
> Best regards, Kathleen
>
> -----Original Message----- From: perpass-bounces@ietf.org=20
> [mailto:perpass-bounces@ietf.org] On Behalf Of Hannes Tschofenig
> Sent: Friday, October 25, 2013 3:59 AM To: Joseph Lorenzo Hall;=20
> Stephen Kent; perpass Subject: Re: [perpass] Standards in the age of=20
> pervasive suspicion
>
> On 10/23/2013 08:31 PM, Joseph Lorenzo Hall wrote:
>> NIST appears to have learned from this that the standardization=20
>> process has to be equally as transparent as the=20
>> competition/cryptanalysis process. That's a very good thing.
>
> There is still something to learn for NIST when it comes to good=20
> standardization principles, such as those outlined by OpenStand=20
> http://open-stand.org/principles/
>
> I am sure you have seen the related post from the IAB on this topic:
> http://www.iab.org/2013/10/23/comments-from-the-iab-on-nist-sp-800-90a
> -proceeding/
>
>  But it would be unfair to just complain about NIST when many other=20
> government bodies aren't any better. I will share one story I=20
> experienced recently with the European Commission (EC) created Network=20
> and Information Security (NIS) platform. This group was created in=20
> response to the proposed regulation on CyberSecurity by the EC.
>
> The responsible persons from the EC decided to organize a f2f meeting=20
> early June to get their work started. Around 150 persons from all=20
> sectors in the industry showed up to the meeting (mostly from bigger=20
> cooperations who have public policy people in Brussels) since the=20
> meeting was announced short notice.
>
> The meeting was lead by Giuseppe Abbamonte and he ran the meeting in=20
> the style expressed at their webpage: "the Commission will select the=20
> platform participants, with a view to ensuring a balanced and=20
> manageable representation of the different stakeholders."
>
> At the end of the meeting he came up with the idea that there should=20
> be 3 groups with maximum 20 persons each and he will nominate the=20
> persons for those groups.
>
> I dared to suggest to follow a model like in the IETF with open=20
> participation. He shouted at me and said that this will never happen.=20
> The argument was that this has never worked in the EC so far.
>
> Of course the folks in the participating people in the room quickly=20
> noticed that 3x20 by no means leads to 150 and so more than half of=20
> the participants of the f2f meeting wouldn't be allowed to participate=20
> in the work. (I ignore those who weren't able to show up at the f2f=20
> meeting or smaller enterprises who don't have the budget to fly to=20
> Brussels just to chat.) I am sure most of them had no expectation that=20
> it would lead to something useful but they at least wanted to follow=20
> it and jump it when it completely goes into the wrong direction.
>
> An hour later the model was changed and larger groups were allowed;=20
> that's still far away from an IETF type of participation style.
>
> These are the types of groups who are supposed to develop solutions to=20
> improve the security of the Internet.
>
> Ciao Hannes
>
>
> _______________________________________________ perpass mailing list=20
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
>
> _______________________________________________ perpass mailing list=20
> perpass@ietf.org https://www.ietf.org/mailman/listinfo/perpass
>



From hannes.tschofenig@gmx.net  Fri Oct 25 07:56:45 2013
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References: <CAMm+LwiDGDDOpWGq=2GePUjwE00U_HgFzakdPOgQKGYN3=qGpA@mail.gmail.com>	<5265FB71.1020408@cisco.com>	<526617D2.5060903@gmx.net>	<6.2.5.6.2.20131021232826.0dbc9530@resistor.net>	<5267E076.5010700@bbn.com>	<21D6C0EE-0C10-4DC9-ADD6-A6CFA212D163@icsi	<526815F0.8020100@cdt.org>	<526A24AD.8000107@gmx.net> <F5063677821E3B4F81ACFB7905573F24049EA32CF5@MX15A.corp.emc.com> <526A80AA.3080504@gmx.net> <F5063677821E3B4F81ACFB7905573F24049EA32D16@MX15A.corp.emc.com>
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Subject: Re: [perpass] Standards in the age of pervasive suspicion
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Hi Kathleen,

as you mentioned, the process used by NIST far exceeds what other 
organizations do today. They also employ a lot of great technical people 
(and we got to know some of them better) and so there is less risk that 
the work goes into a wrong direction. This is the reason why we trusted 
their recommendations.

While there is still room for improvement many other organizations even 
have to get to that level.

I think the OpenStand document is a good template. While it is written 
with a focus on traditional standardization in mind I believe it has 
much broader applicability.

Ciao
Hannes

On 10/25/2013 04:46 PM, Moriarty, Kathleen wrote:
> Hi Hannes,
>
> Good point, the comments as an expert reviewer were not published,
> nor was the response.  However in the development of the framework
> from the Cyber Security Executive order, NIST did publish all of the
> contributions.  I was heavily involved in that for EMC, although I
> did not have time to attend the workshops that followed.
>
> Responses, I believe, just go directly to the submitter.  We, as a
> company, have had comments rejected (different document) and have
> submitted them again for subsequent revisions of the documents.  The
> explanations were reasonable, although we didn't necessarily agree
> and the instance I am referring to is not something that would cause
> a security concern.
>
> The IETF's level of transparency exceeds many other standards
> development organizations.
>
> Thanks, Kathleen
>
> -----Original Message----- From: Hannes Tschofenig
> [mailto:hannes.tschofenig@gmx.net] Sent: Friday, October 25, 2013
> 10:31 AM To: Moriarty, Kathleen; Joseph Lorenzo Hall; Stephen Kent;
> perpass Subject: Re: [perpass] Standards in the age of pervasive
> suspicion
>
> Hi Kathleen,
>
> in my mail below I had shared one example of how the process in other
> parts of the world look like and actually defended NIST to a certain
> extend.
>
> However, I had some experience with NIST myself, for example with the
> NSTIC work. I am sure there are other on the list who have had
> experience with other initiatives, such as the SmartGrid.
>
> Take your experience described below and compare it with the IETF.
> Have your comments been published somewhere and are they accessible
> to the public? What is the decision process for incorporating
> comments from different sources? What is the dispute resolution
> process?
>
> Ciao Hannes
>
> On 10/25/2013 03:51 PM, Moriarty, Kathleen wrote:
>> As the final expert reviewer on a fairly recent NIST publication
>> (about 1 year ago), I will attest to their good practices.  They
>> do work on standards collaboratively, take open calls for feedback
>> and then provide responses to those who comment.
>>
>> I wound up reading the document 5 different times, providing
>> feedback in each instance that was typically accepted and all
>> responses were reasonable.  They do make an effort to find an
>> expert in the area of the standard publication as well.
>>
>> I did not read the full thread, so sorry if any of this was
>> out-of-context, but I thought the first-hand experience and their
>> use of a final external reviewer might be helpful for some to
>> understand.
>>
>> Best regards, Kathleen
>>
>> -----Original Message----- From: perpass-bounces@ietf.org
>> [mailto:perpass-bounces@ietf.org] On Behalf Of Hannes Tschofenig
>> Sent: Friday, October 25, 2013 3:59 AM To: Joseph Lorenzo Hall;
>> Stephen Kent; perpass Subject: Re: [perpass] Standards in the age
>> of pervasive suspicion
>>
>> On 10/23/2013 08:31 PM, Joseph Lorenzo Hall wrote:
>>> NIST appears to have learned from this that the standardization
>>> process has to be equally as transparent as the
>>> competition/cryptanalysis process. That's a very good thing.
>>
>> There is still something to learn for NIST when it comes to good
>> standardization principles, such as those outlined by OpenStand
>> http://open-stand.org/principles/
>>
>> I am sure you have seen the related post from the IAB on this
>> topic:
>> http://www.iab.org/2013/10/23/comments-from-the-iab-on-nist-sp-800-90a
>>
>>
-proceeding/
>>
>> But it would be unfair to just complain about NIST when many other
>> government bodies aren't any better. I will share one story I
>> experienced recently with the European Commission (EC) created
>> Network and Information Security (NIS) platform. This group was
>> created in response to the proposed regulation on CyberSecurity by
>> the EC.
>>
>> The responsible persons from the EC decided to organize a f2f
>> meeting early June to get their work started. Around 150 persons
>> from all sectors in the industry showed up to the meeting (mostly
>> from bigger cooperations who have public policy people in Brussels)
>> since the meeting was announced short notice.
>>
>> The meeting was lead by Giuseppe Abbamonte and he ran the meeting
>> in the style expressed at their webpage: "the Commission will
>> select the platform participants, with a view to ensuring a
>> balanced and manageable representation of the different
>> stakeholders."
>>
>> At the end of the meeting he came up with the idea that there
>> should be 3 groups with maximum 20 persons each and he will
>> nominate the persons for those groups.
>>
>> I dared to suggest to follow a model like in the IETF with open
>> participation. He shouted at me and said that this will never
>> happen. The argument was that this has never worked in the EC so
>> far.
>>
>> Of course the folks in the participating people in the room
>> quickly noticed that 3x20 by no means leads to 150 and so more than
>> half of the participants of the f2f meeting wouldn't be allowed to
>> participate in the work. (I ignore those who weren't able to show
>> up at the f2f meeting or smaller enterprises who don't have the
>> budget to fly to Brussels just to chat.) I am sure most of them had
>> no expectation that it would lead to something useful but they at
>> least wanted to follow it and jump it when it completely goes into
>> the wrong direction.
>>
>> An hour later the model was changed and larger groups were
>> allowed; that's still far away from an IETF type of participation
>> style.
>>
>> These are the types of groups who are supposed to develop solutions
>> to improve the security of the Internet.
>>
>> Ciao Hannes
>>
>>
>> _______________________________________________ perpass mailing
>> list perpass@ietf.org
>> https://www.ietf.org/mailman/listinfo/perpass
>>
>> _______________________________________________ perpass mailing
>> list perpass@ietf.org
>> https://www.ietf.org/mailman/listinfo/perpass
>>
>
>


From hallam@gmail.com  Fri Oct 25 08:49:30 2013
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From: Phillip Hallam-Baker <hallam@gmail.com>
Date: Fri, 25 Oct 2013 11:49:19 -0400
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To: Joseph Lorenzo Hall <joe@cdt.org>
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Cc: perpass <perpass@ietf.org>, Stephen Kent <kent@bbn.com>
Subject: Re: [perpass] Standards in the age of pervasive suspicion
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The problem created here is likely limited to perception. But that is
still a big problem if the result is we end up having to contend with
multiple national standards.

We need to think about protocol design in a different way and instead
of asking if something is 'sufficient' look at multiple layers of
protection that provide sufficient strength even with compromises of
some components.

Sent from my difference engine


> On Oct 23, 2013, at 2:31 PM, Joseph Lorenzo Hall <joe@cdt.org> wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
>
>
>> On 10/23/13 11:31 AM, Stephen Kent wrote:
>>
>>
>> I read Bruces's post at the cited URL. The developers of the alg
>> replied:
>>
>> That does not seem consistent with "mysteriously changed."
>
> It is consistent... the process from a winning cryptographic algorithm
> to NIST FIPS standardization is pretty murky, and if you follow the
> hash-forum list at NIST, you'd see a lot of hue and cry about the
> reduction in capacity of Keccak. Of course, now that the Keccak team
> has weighed in, it appears that the eventual SHA-3 FIPS standard will
> include one or more high-security modes.
>
> NIST appears to have learned from this that the standardization
> process has to be equally as transparent as the
> competition/cryptanalysis process. That's a very good thing.
>
> best, Joe
>
> - --
> Joseph Lorenzo Hall
> Chief Technologist
> Center for Democracy & Technology
> 1634 I ST NW STE 1100
> Washington DC 20006-4011
> (p) 202-407-8825
> (f) 202-637-0968
> joe@cdt.org
> PGP: https://josephhall.org/gpg-key
> fingerprint: BE7E A889 7742 8773 301B 4FA1 C0E2 6D90 F257 77F8
>
>
> -----BEGIN PGP SIGNATURE-----
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From scott.brim@gmail.com  Fri Oct 25 09:08:54 2013
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Subject: Re: [perpass] ITU-T 's anti-perpass work
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--047d7b4725da8c1bcf04e992f6aa
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Tony, I no longer have a TIES account so I can't look at the base document,
but I don't see any great harm in the little ones you posted. They describe
various aspects of "big data" (which is a big topic), and while they are
clearly considering the possibility of capturing business intelligence,
they don't seem to give particular stress to it versus other aspects.
 Unless you have more evidence I will probably continue to ignore ITU big
data.  Lots of people have plans to hoover up all possible data already,
with or without ITU.


On Fri, Oct 25, 2013 at 10:35 AM, Tony Rutkowski
<rutkowski.tony@gmail.com>wrote:

> On 10/25/2013 9:32 AM, Dave Crocker wrote:
>
>> Please provide some detail, to explain how these contributions are
>> anti-perpass.
>>
>
> Hi Dave,
>
> The term "anti-perpass" was used to
> described a significant initiative
> begun in the ITU-T last year to
> develop a set of Recommendations in
> its Study Group 13 (essentially Internet
> and Cloud Computing) to Hoover up,
> store, and analyze everything passing
> through the networks.
>
> The proponents (China Unicom, the China
> Information Ministry, ZTE, and ETRI)
> argued argued that "Over the Top"
> providers were capturing and
> using information about "their"
> telco customer to their detriment
> and instituted a Big Data project.
> The work included coupling to the
> many new DPI standards being developed
> in the same Study Group.
>
> The ITU-T today is predominantly a forum
> for China, Korea ETRI, and Japan.  However
> some governments intervened to suggest this
> work was not a good thing.  An exacerbating
> factor is that 89 nations last year signed
> an ITU treaty obligating themselves to
> implement ITU-T Recommendations.  The work
> was temporarily halted early this year
> because of the interventions, but with the
> Kampala meeting, it is now scaling up again
> with these documents.
>
> The IETF could perhaps help here by offering
> critical comment that having global ITU
> Recommendations that promote if not mandate
> pervasive surveillance and analysis of
> individual users is not a good thing.
> The attached documents are exemplary.
>
> --tony
>
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>
>

--047d7b4725da8c1bcf04e992f6aa
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Tony, I no longer have a TIES account so I can&#39;t look =
at the base document, but I don&#39;t see any great harm in the little ones=
 you posted. They describe various aspects of &quot;big data&quot; (which i=
s a big topic), and while they are clearly considering the possibility of c=
apturing business intelligence, they=A0don&#39;t seem to give particular st=
ress to it versus other aspects. =A0Unless you have more evidence I will pr=
obably continue to ignore ITU big data. =A0Lots of people have plans to hoo=
ver up all possible data already, with or without ITU.</div>

<div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Fri, Oct 2=
5, 2013 at 10:35 AM, Tony Rutkowski <span dir=3D"ltr">&lt;<a href=3D"mailto=
:rutkowski.tony@gmail.com" target=3D"_blank">rutkowski.tony@gmail.com</a>&g=
t;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im">On 10/25/2013 9:32 AM, Dav=
e Crocker wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Please provide some detail, to explain how these contributions are anti-per=
pass. <br>
</blockquote>
<br></div>
Hi Dave,<br>
<br>
The term &quot;anti-perpass&quot; was used to<br>
described a significant initiative<br>
begun in the ITU-T last year to<br>
develop a set of Recommendations in<br>
its Study Group 13 (essentially Internet<br>
and Cloud Computing) to Hoover up,<br>
store, and analyze everything passing<br>
through the networks.<br>
<br>
The proponents (China Unicom, the China<br>
Information Ministry, ZTE, and ETRI)<br>
argued argued that &quot;Over the Top&quot;<br>
providers were capturing and<br>
using information about &quot;their&quot;<br>
telco customer to their detriment<br>
and instituted a Big Data project.<br>
The work included coupling to the<br>
many new DPI standards being developed<br>
in the same Study Group.<br>
<br>
The ITU-T today is predominantly a forum<br>
for China, Korea ETRI, and Japan. =A0However<br>
some governments intervened to suggest this<br>
work was not a good thing. =A0An exacerbating<br>
factor is that 89 nations last year signed<br>
an ITU treaty obligating themselves to<br>
implement ITU-T Recommendations. =A0The work<br>
was temporarily halted early this year<br>
because of the interventions, but with the<br>
Kampala meeting, it is now scaling up again<br>
with these documents.<br>
<br>
The IETF could perhaps help here by offering<br>
critical comment that having global ITU<br>
Recommendations that promote if not mandate<br>
pervasive surveillance and analysis of<br>
individual users is not a good thing.<br>
The attached documents are exemplary.<span class=3D"HOEnZb"><font color=3D"=
#888888"><br>
<br>
--tony<br>
</font></span><br>_______________________________________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/perpass</a><br>
<br></blockquote></div><br></div>

--047d7b4725da8c1bcf04e992f6aa--

From paul@cypherpunks.ca  Fri Oct 25 11:08:38 2013
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From: Paul Wouters <paul@cypherpunks.ca>
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Cc: perpass@ietf.org
Subject: Re: [perpass] OpenPGP Server-side Signed E-mail [Was: e-mail security idea: server2server PGP]
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On Thu, 24 Oct 2013, Noel Torres wrote:

> The promised rough draft:

> Initial Draft about OpenPGP Server-side Signed E-mail (OPSS e-mail)

I don't understand how this adds anything to STARTTLS with TLSA/DNSSEC,
apart from being able to get a remote server key from a HKP server,
which in itself is completely untrusted without web-of-trust
verification by a human.

In fact, TLS with DHE would be more secure agaisnt a pervasive monitor
that obtains access to a mailserver's private openpgp key.

What would doing openpgp encryption within TLS add security wise?

Paul

From hallam@gmail.com  Fri Oct 25 17:36:18 2013
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Date: Fri, 25 Oct 2013 20:36:07 -0400
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From: Phillip Hallam-Baker <hallam@gmail.com>
To: DataPacRat <datapacrat@gmail.com>
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Subject: Re: [perpass] Web-of-trust CAs
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On Tue, Oct 22, 2013 at 5:53 PM, DataPacRat <datapacrat@gmail.com> wrote:

> On Tue, Oct 22, 2013 at 5:02 PM, Phillip Hallam-Baker <hallam@gmail.com>
> wrote:
> > On Tue, Oct 22, 2013 at 4:14 PM, DataPacRat <datapacrat@gmail.com>
> wrote:
>
> >> I could suggest that the values be interpreted in terms of LaPlace's
> >> Sunrise formula - eg, "there's been 10 reports of the key being used
> >> falsely and 500,000 that it's been used successfully: Do you wish to
> >> continue?".
> >
> > This is why I would not attempt to use Bayesian logic.
> >
> > You have no way to measure probability reliably. An attacker can simulate
> > any behavior before they defect. The only measure that is useful is the
> cost
> > of simulating that behavior. If it is prohibitively high then we can
> decide
> > to trust them.
> >
> > Remember that Bernie Madoff paid out 100% of every redemption request
> right
> > up to the point where the money ran out.
>
> One thing using Bayesian/LaPlacian numbers /can/ do is indicate how
> much effort would need to have been exerted in order to simulate the
> behaviour. If implemented correctly, then put simply, you can't get to
> 40 decibans of confidence without having had 10,000 successful tests
> for every failed test.


 Like many powerful theory tools, Bayesian inference is perfect in theory
but useless for many of the purposes people try to use it for.

The problem with any analysis based on probability is that the confidence
can only diminish as the distance between the nodes increases. The problem
with Web of trust is that the generation loss between keysignings limits
the diameter of the trust graph and the amount of effort users will bear
limits the degree.

Taken together these give a maximum size to given by the Moore bound on the
number of nodes in the graph.


-- 
Website: http://hallambaker.com/

--089e0118293a835ab004e99a0d98
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">On Tue, Oct 22, 2013 at 5:53 PM, DataPacRat <span dir=3D"l=
tr">&lt;<a href=3D"mailto:datapacrat@gmail.com" target=3D"_blank">datapacra=
t@gmail.com</a>&gt;</span> wrote:<br><div class=3D"gmail_extra"><div class=
=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im">On Tue, Oct 22, 2013 at 5:=
02 PM, Phillip Hallam-Baker &lt;<a href=3D"mailto:hallam@gmail.com">hallam@=
gmail.com</a>&gt; wrote:<br>

&gt; On Tue, Oct 22, 2013 at 4:14 PM, DataPacRat &lt;<a href=3D"mailto:data=
pacrat@gmail.com">datapacrat@gmail.com</a>&gt; wrote:<br>
<br>
</div><div class=3D"im">&gt;&gt; I could suggest that the values be interpr=
eted in terms of LaPlace&#39;s<br>
&gt;&gt; Sunrise formula - eg, &quot;there&#39;s been 10 reports of the key=
 being used<br>
&gt;&gt; falsely and 500,000 that it&#39;s been used successfully: Do you w=
ish to<br>
&gt;&gt; continue?&quot;.<br>
&gt;<br>
&gt; This is why I would not attempt to use Bayesian logic.<br>
&gt;<br>
&gt; You have no way to measure probability reliably. An attacker can simul=
ate<br>
&gt; any behavior before they defect. The only measure that is useful is th=
e cost<br>
&gt; of simulating that behavior. If it is prohibitively high then we can d=
ecide<br>
&gt; to trust them.<br>
&gt;<br>
&gt; Remember that Bernie Madoff paid out 100% of every redemption request =
right<br>
&gt; up to the point where the money ran out.<br>
<br>
</div>One thing using Bayesian/LaPlacian numbers /can/ do is indicate how<b=
r>
much effort would need to have been exerted in order to simulate the<br>
behaviour. If implemented correctly, then put simply, you can&#39;t get to<=
br>
40 decibans of confidence without having had 10,000 successful tests<br>
for every failed test.</blockquote><div><br></div><div>=A0Like many powerfu=
l theory tools, Bayesian inference is perfect in theory but useless for man=
y of the purposes people try to use it for.</div><div><br></div><div>The pr=
oblem with any analysis based on probability is that the confidence can onl=
y diminish as the distance between the nodes increases. The problem with We=
b of trust is that the generation loss between keysignings limits the diame=
ter of the trust graph and the amount of effort users will bear limits the =
degree.=A0</div>
<div><br></div><div>Taken together these give a maximum size to given by th=
e Moore bound on the number of nodes in the graph.</div></div><br clear=3D"=
all"><div><br></div>-- <br>Website: <a href=3D"http://hallambaker.com/">htt=
p://hallambaker.com/</a><br>

</div></div>

--089e0118293a835ab004e99a0d98--

From doug.mtview@gmail.com  Fri Oct 25 17:42:47 2013
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From: Douglas Otis <doug.mtview@gmail.com>
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Subject: [perpass] Possible talking points
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Dear Perpass WG,

Can networks ever be assumed secure carrying data in the clear?

"Veracity" is an interesting term defined in T13-C-0427 offered by Tony =
Rutkowski.

When dealing with powerful adversaries (state or organized crime) is it =
safe to assume the veracity of:
 a) the routing system ?
 b) DNS ?
 c) the reputation of an identifier ?

http://tools.ietf.org/html/rfc6545#section-9.3
 Can email be treated "as if" each message were RID messages ?

What are reasonable source compliance requirements for encrypted =
messages ?
 (such as certificates verifying the entity initiating the message.)=20

What is the market value of guidelines permitting domain use as a basis =
for acceptance ?
 a) IP address independence
 b) Provider independence
 c) Justification for improved security

Can comparative overheads be extrapolated among various suggested =
strategies ?

Is DANE still on the table, since any strategy should have long term =
perspectives ?

For example, will CA issued certificates:
 a) cost impair wide adoption
 b) leak sensitive information
 c) prove untrustworthy facing geopolitical pressure
 d) prove difficult maintaining revocations

Transitioning to DNSSEC, can CA issued certificates offer temporary =
fallback strategies for DANE ?

Does a certified provider of an encrypted message place individuals at =
risk ?

When most email is encrypted, can provider certificates who initiate =
messages serve to protect services from excessive overhead caused by =
pervasive abuse?

As a note, the public domain Judy array library can list all domains in =
current use at more than 5 million transactions per second needing about =
15% greater memory overhead than that of a flat list. =20

Regards,
Douglas Otis

--Apple-Mail=_C83FD9DA-4876-4ED0-8B45-9FBB01EBA30F
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
"><div>Dear Perpass WG,</div><div><br></div><div>Can networks ever be =
assumed secure carrying data in the =
clear?</div><div><br></div><div>"Veracity" is an interesting term =
defined in T13-C-0427 offered by Tony =
Rutkowski.</div><div><br></div><div>When dealing with powerful =
adversaries (state or organized crime) is it safe to assume the veracity =
of:</div><div>&nbsp;a) the routing system ?</div><div>&nbsp;b) DNS =
?</div><div>&nbsp;c) the reputation of an identifier =
?</div><div><br></div><div><a =
href=3D"http://tools.ietf.org/html/rfc6545#section-9.3">http://tools.ietf.=
org/html/rfc6545#section-9.3</a></div><div>&nbsp;Can email be treated =
"as if" each message were RID messages ?</div><div><br></div><div>What =
are reasonable source compliance requirements for encrypted messages =
?</div><div>&nbsp;(such as&nbsp;certificates verifying the entity =
initiating the message.)&nbsp;</div><div><br></div><div>What is the =
market value of guidelines permitting domain use as a basis for =
acceptance ?</div><div>&nbsp;a) IP address =
independence</div><div>&nbsp;b) Provider independence</div><div>&nbsp;c) =
Justification for improved security</div><div><br></div><div>Can =
comparative overheads be extrapolated among various suggested strategies =
?</div><div><br></div><div>Is DANE still on the table, since any =
strategy should have long term perspectives =
?</div><div><br></div><div>For example, will CA issued =
certificates:</div><div>&nbsp;a) cost impair wide =
adoption</div><div>&nbsp;b) leak sensitive =
information</div><div>&nbsp;c) prove untrustworthy facing geopolitical =
pressure</div><div>&nbsp;d) prove difficult maintaining =
revocations</div><div><br></div><div>Transitioning to DNSSEC, can CA =
issued certificates offer temporary fallback strategies for DANE =
?</div><div><br></div><div>Does a certified provider of an encrypted =
message place individuals at risk ?</div><div><br></div><div>When most =
email is encrypted, can provider certificates who initiate messages =
serve to protect services from excessive overhead caused by pervasive =
abuse?</div><div><br></div><div>As a note, the public domain Judy array =
library can list all domains in current use at more than 5 million =
transactions per second needing about 15% greater memory overhead than =
that of a flat list. &nbsp;</div><div><br></div><div =
apple-content-edited=3D"true">
Regards,<br>Douglas Otis<br></div></body></html>=

--Apple-Mail=_C83FD9DA-4876-4ED0-8B45-9FBB01EBA30F--

From hannes.tschofenig@gmx.net  Sat Oct 26 02:02:32 2013
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Date: Sat, 26 Oct 2013 11:02:33 +0200
From: Hannes Tschofenig <hannes.tschofenig@gmx.net>
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Subject: Re: [perpass] draft-tschofenig-perpass-surveillance-00.txt
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Hi Linus,

thanks for your review. I have taken your comments into account and have 
updated the document accordingly. Here is the new version:
https://github.com/hannestschofenig/tschofenig-ids/blob/master/surveillance/draft-tschofenig-perpass-surveillance-01.txt

Regarding the question about meta-data vs. actual content I believe that 
is subject of a separate document, namely the one that Brian Trammell 
wrote.

The other thing is that I wanted to keep it at a high level since the 
document is only supposed to provide an introduction to the plenary.

Ciao
Hannes

On 10/23/2013 09:57 AM, Linus Nordberg wrote:
> Hi Hannes,
>
> Thanks for writing draft-tschofenig-perpass-surveillance-00. I wish I
> could muster the powers needed to make text.
>
> Generally, I lack information about what's often called meta-data or
> traffic data and the key issue here -- linkability. I don't really know
> what I want to say here. I started a private thread with Stephen about a
> month ago but then dropped the ball. It's quite broad and I don't know
> how to tackle it really.
>
> Should 2.2 mention IPv4? Widely (heh) deployed protocol leaking
> meta-data by design. I think it should be touched upon even if we don't
> expect changes to it. Maybe that's exactly why we must mention it
> somewhere -- some people do not grasp it while others might be hesitant
> to touch the issue. IPv6 is another one. I bet there are more.
>
>
> Typos and other minor things.
>
> - Is the expire date 2014-04-24 correct?
>
> - 2.1. s/a a/a/1
>
> - 2.1. s/'crypto-aglity'/'crypto-agility'/1
>
> - 2.2. s/exploided/exploited/1
>
> - 2.4. last sentence "With the juridiction [...]" needs some love.
>
> - 3. copied from another document
>
> - 6. [10] and [11], swap Nadia and IETF
>
>
> Http vs https. (Flogging a dead horse?)
>
> - 6. the following urls could and should be https rather than http:
>    http://packetstormsecurity.com/files/105499/Browser-Exploit-Against-SSL-TLS.html
>    http://arstechnica.com/security/2013/09/stop-using-nsa-influence-code-in-our-product-rsa-tells-customers/
>    http://crypto.stackexchange.com/questions/10263/should-we-trust-the-nist-recommended-ecc-parameters
>
> - 6. (and other places) the following urls should be https even if they
>    redirect to https, both for educational reasons and for security/privacy
>    (not leaking the full url, not having to trust that a hijacker doesn't
>    eat the redirect):
>    http://www.ietf.org/mail-archive/web/perpass/current/maillist.html
>    http://datatracker.ietf.org/drafts/current/
>
> - 6. (and other places) the following urls should have a warning about
>    not being https or perhaps have their content mirrored on a site
>    providing https (with a proper certificate):
>    http://boingboing.net/2013/08/05/anti-tor-malware-reported-back.html
>    http://fileperms.org/whatsapp-is-broken-really-broken/ (bad certificate)
>    http://www.wired.com/threatlevel/2013/09/nsa-router-hacking/ (bad certificate)
>    http://www.tschofenig.priv.at (bad certificate)
>    http://trustee.ietf.org/license-info (404)
>


From jacob@appelbaum.net  Sat Oct 26 02:29:05 2013
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Subject: Re: [perpass] OpenPGP Server-side Signed E-mail [Was: e-mail security idea: server2server PGP]
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Paul Wouters:
> On Thu, 24 Oct 2013, Noel Torres wrote:
> 
>> The promised rough draft:
> 
>> Initial Draft about OpenPGP Server-side Signed E-mail (OPSS e-mail)
> 
> I don't understand how this adds anything to STARTTLS with TLSA/DNSSEC,
> apart from being able to get a remote server key from a HKP server,
> which in itself is completely untrusted without web-of-trust
> verification by a human.
> 
> In fact, TLS with DHE would be more secure agaisnt a pervasive monitor
> that obtains access to a mailserver's private openpgp key.
> 
> What would doing openpgp encryption within TLS add security wise?
> 

Defense in depth. If the StartTLS server uses RC4, for example, I'd want
a different layer for actual protection.

All the best,
Jacob

From yaronf.ietf@gmail.com  Sat Oct 26 05:06:44 2013
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Date: Sat, 26 Oct 2013 15:06:18 +0300
From: Yaron Sheffer <yaronf.ietf@gmail.com>
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Cc: Salvatore Loreto <salvatore.loreto@ericsson.com>, perpass@ietf.org
Subject: Re: [perpass] Hasty PRISM proofing considered harmful
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Hi Peter,

I understand the need for multiple BCPs, I just want to minimize=20
conflicts between them, and we will need a lot of communication to do tha=
t.

There's a bunch of process questions that we'll need to discuss over=20
time (Informational vs. PS etc.), but let's postpone this stuff.

Lastly, my view of the TLS BCP document is as an interim measure, until=20
TLS 1.3 comes around and until the industry adopts it. Yes, this could=20
be 2-3 years or possibly more. App-level BCPs should IMHO anticipate=20
this migration from TLS 1.2 augmented by the BCP (essentially a profile) =

into TLS 1.3.

Thanks,
     Yaron

On 2013-10-24 21:03, Peter Saint-Andre wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 10/23/13 6:02 AM, Stephen Farrell wrote:
>>
>> On 10/23/2013 12:52 PM, Alexey Melnikov wrote:
>>> Hi Stephen,
>>>
>>> On 22/10/2013 17:46, Stephen Farrell wrote:
>>>> Yep, that's a useful post - we shouldn't rush too much, but we
>>>> do want to get things done so that developers and deployers
>>>> have something to use.
>>>>
>>>> I wonder what's the best way to proceed with this kind of
>>>> stuff. I guess we want a BCP of some sort, but the question is
>>>> how to handle the various different cases of foo-with-tls.
>>>>
>>>> - Yaron did a generic TLS BCP draft. [1] - PSA did an XMPP TLS
>>>> BCP draft [2] - This sounds like we might want an SMTP TLS BCP
>>>> draft or perhaps to add text to [3], but that's aiming for
>>>> experimental and is just about using DANE.
>>> I think some generic fallback rules can be protocol independent.
>>> But needs of different protocols might be different. For example
>>> backward compatibility with deployed TLS ciphers might be
>>> different for XMPP and SMTP.
>> Sounds reasonable. I guess even if they have the same libraries the
>> update cycles might differ. (Anyone know?)
> I expect that the update cycles are indeed different.
>
> I don't particularly *want* to have different BCPs for different
> protocols, and personally I'd like to see as much commonality as
> possible (with everyone pointing to Yaron's generic document).
> However, there are some application-level differences (e.g., with
> regard to session resumption) and each community (email, IM, web,
> etc.) has had a different experience with the use of TLS, including
> varying release schedules or willingness to release more often, use of
> STARTTLS vs. separate ports, bigger or smaller networks, more or less
> diverse developer community (e.g., with no one dominant implementation
> or small set of implementations), client-to-server only communications
> vs. also server-to-server federation, varying user expectations, etc.
>
>>> I think SMTP TLS BCP would be a good idea. I think it should be
>>> independent of DANE, because of the status of the DANE document.
>>> I would be happy to work on it (and would be happy to collaborate
>>> with PSA to discuss similarities and differences).
>> Great. Let's talk in YVR about how to get that done so its a real
>> BCP that gets followed in the wild. If someone else is up for
>> helping I guess contact Alexey.
> Before this thread emerged, I suggested the idea of having a chat
> about this topic during the AppsArea session on Monday morning (and
> BTW there are no SEC area sessions opposite). That might be a good
> place to start.
>
> Peter
>
> - --=20
> Peter Saint-Andre
> https://stpeter.im/
>
>
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>


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Cc: perpass@ietf.org
Subject: Re: [perpass] OpenPGP Server-side Signed E-mail [Was: e-mail security idea: server2server PGP]
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Jacob Appelbaum wrote this message on Sat, Oct 26, 2013 at 09:24 +0000:
> Paul Wouters:
> > On Thu, 24 Oct 2013, Noel Torres wrote:
> > 
> >> The promised rough draft:
> > 
> >> Initial Draft about OpenPGP Server-side Signed E-mail (OPSS e-mail)
> > 
> > I don't understand how this adds anything to STARTTLS with TLSA/DNSSEC,
> > apart from being able to get a remote server key from a HKP server,
> > which in itself is completely untrusted without web-of-trust
> > verification by a human.
> > 
> > In fact, TLS with DHE would be more secure agaisnt a pervasive monitor
> > that obtains access to a mailserver's private openpgp key.
> > 
> > What would doing openpgp encryption within TLS add security wise?
> > 
> 
> Defense in depth. If the StartTLS server uses RC4, for example, I'd want
> a different layer for actual protection.

If the admin spent the time to configure OPSS, why not configure TLS
properly in the first place?

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."

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Just to clarify, that was "offered" by China Telecom
and the China MIIT, not me. -t

On 10/25/2013 8:42 PM, Douglas Otis wrote:
> "Veracity" is an interesting term defined in T13-C-0427 offered by 
> Tony Rutkowski.
>


From ned+perpass@mrochek.com  Sat Oct 26 08:17:11 2013
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To: Christian Huitema <huitema@huitema.net>
Cc: 'Ted Hardie' <ted.ietf@gmail.com>, perpass@ietf.org, 'Stephen Farrell' <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] Some personal thoughts on the impact of	pervasive	monitoring
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> > Thanks for the draft. As you might guess from earlier discussion
> > on here, I think the more-than-MTI approach espoused is maybe the
> > right one, if we can figure out how to state the requirement well.
> > Have you any ideas on that, or on how we could get towards a
> > situation where that gained consensus?

> Networking standards are promoted by consensus and by network effects. In
> the absence of some forcing function, "fallback to clear text" gets promoted
> by network effects, because it is de facto forced by the sites that don't
> bother deploying the more secure options. The best way to break that is to
> provide "air cover" for security, e.g. a text in the protocol description
> RFC that says "nodes requiring a modicum of security SHOULD refuse to use
> clear text connections."  That would effectively turn the tables.

Exactly! The only thing I would add is that "cover" should include a
clear presentation of the tradeoffs and consequences.

Unfortunately this is surprisingly hard to do well. It's much easier to start
throwing MUSTs around.

This also is effectively what happened in the IMAP case: Large sites like gmail
and Apple only deployed imaps, with the result that a fully standards-compliant
client actually won't work with their service!

> Suppose for example that a large enough mail service starts to require TLS
> for SMTP connections. Many sites who are accustomed to send mail in clear
> text will initially protest when their mail gets bounced. But if the
> standard says that yes, they have all right to do that, then the big site
> has "air cover." "I am not breaking you, I am just following best practice."
> At this point, you will see more and more sites opting to turn on TLS, and
> pretty soon the network effects will work in favor of encryption.

This, OTOH, is a little trickier. You first have to distinguish between
SMTP SUBMIT and SMTP relay. I haven't surveyed the former extensively,
but the odds are good it's in roughtly the same situation as IMAP.

The latter is a problem due to the need for every client to work with every
server, as opposed to saying "use a client with these capabilities if you want
to use our service". It's a very different dynamic. Moreover, lots of people
have tried to shift to SSL/TLS in this space and it has not worked well at all.

But this doesn't mean there's no way to make the transition. One possibility is
an SMTP extension to require SSL/TLS on a per-message basis. (A draft has
already been written and is being discussed.) Another one, which I like a lot
better, is to opportunistic SSL/TLS use plus latching. Chris Newman is
working on a draft on that.

And this is actually a case where often-derided "bilateral agreement" idea in
X.400 could go a long way. The distribution of email usage is such that an
agreement to require SSL/TLS between the top-tier MSPs and ISPs would protect a
significant percentage of traffic. And think of the incentive that would
represent to other providers.

> Of course, to be practical, this requires that sites can easily get a
> certificate of some kind, PKI or DANE, to actually use TLS...

Require? Not necessarily - see above. But it would definitely improve the
situation if this stuff were easier to deploy.

				Ned

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Subject: Re: [perpass] Some personal thoughts on the impact of	pervasive	monitoring
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Hi Ned,

On 10/26/13 4:48 PM, ned+perpass@mrochek.com wrote:
>> Networking standards are promoted by consensus and by network effects. In
>> the absence of some forcing function, "fallback to clear text" gets promoted
>> by network effects, because it is de facto forced by the sites that don't
>> bother deploying the more secure options. The best way to break that is to
>> provide "air cover" for security, e.g. a text in the protocol description
>> RFC that says "nodes requiring a modicum of security SHOULD refuse to use
>> clear text connections."  That would effectively turn the tables.
> Exactly! The only thing I would add is that "cover" should include a
> clear presentation of the tradeoffs and consequences.
>
> Unfortunately this is surprisingly hard to do well. It's much easier to start
> throwing MUSTs around.
>
> This also is effectively what happened in the IMAP case: Large sites like gmail
> and Apple only deployed imaps, with the result that a fully standards-compliant
> client actually won't work with their service!

And maybe that's a good thing, by the way.  But my main point is that
the IAB is reviewing this exact topic at a workshop that will take place
in December on Internet Tecnology Adoption and Transition.  It's not the
first time it's been considered, mind you.  See RFC 5218 by Dave Thaler
and Bernard Aboba.

Eliot

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Subject: Re: [perpass] OpenPGP Server-side Signed E-mail [Was: e-mail security idea: server2server PGP]
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--001a11c3db74fe225804e9a83ae0
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I can't see much point in applying and removing PGP and/or S/MIME at the
start and end of the TLS tunnel. If you are worried about the encryption
strength then fix that. If you are worried about the downgrade attack then
hook a policy layer in.

Message layer security will always cover less than transport on an
individual hop because the message layer encryption can't cover the routing
data.


The advantage of going to message layer security is when the start and/or
end point might be different.

So for example, right now almost nobody is equipped to accept encrypted
email as conveniently as unencrypted. I can only receive encrypted email on
one machine. I don't enable all my machines because it is a hassle and the
keys expire etc.

Sending me a message TLS encrypted, I can only decrypt at the inbound mail
server. A PGP or S/MIME message could be decrypted at the inbound mail
server OR at the mail client depending on what gives the best balance of
performance / security / spam control / compliance and convenience.


The other advantage to using message layer security is that it is possible
to force use of encryption. So for example, let us imagine that I have an
outbound mail server that knows how to resolve key identifiers to public
keys using some protocol (Vcard, WebFinger, WKS, wev). I can poke the
outbound mail server to automatically encrypt messages if the email address
has a particular escape code in it. At the moment I am using a question
mark.


Let us imagine I want to send an email message to Jacob that I want to be
sent encrypted or not at all. I would use the address
?jacob@appelbaum.net which
tells my outbound mail server 'use whatever resolution services are
available to find a key and if a trustworthy key can be found use it to
send the message, otherwise report a delivery failure.


If I really want to be sure that the key is correct then I would explicitly
specify the key fingerprint:

228F-AD20-3DE9-AE7D-84E2-5265-CF9A-6F91-4193-A197?jacob@appelbaum.net


The nice thing about this approach is that I can use it with all my
unmodified mail accounts and mail clients. All that I do is to redirect the
outbound mail service through my trusted outbound mail gateway (which is on
127.0.0.1 on most of my machines). I could even send messages through my
Gmail account (but would have to use a non Webmail client to compose and
send).

Receiving mail requires me to either use a mail client with my S/MIME cert
loaded or an S/MIME viewer for WebMail.


At the moment this is a crazy hybrid of S/MIME and PGP approaches. But the
fact is that S/MIME has pervasive deployment while PGP has a userbase. Plug
ins are a hack for testing purposes only, any security scheme that depends
on typical users deploying a plug in is going to fail. It is painful enough
dealing with the vagaries of the platform and application update mechanisms
changing stuff on a daily basis without a layer of plug ins to cope with on
top.

--001a11c3db74fe225804e9a83ae0
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">I can&#39;t see much point in applying and removing PGP an=
d/or S/MIME at the start and end of the TLS tunnel. If you are worried abou=
t the encryption strength then fix that. If you are worried about the downg=
rade attack then hook a policy layer in.<div>
<br></div><div>Message layer security will always cover less than transport=
 on an individual hop because the message layer encryption can&#39;t cover =
the routing data.</div><div><br><div><br></div><div>The advantage of going =
to message layer security is when the start and/or end point might be diffe=
rent.</div>
</div><div><br></div><div>So for example, right now almost nobody is equipp=
ed to accept encrypted email as conveniently as unencrypted. I can only rec=
eive encrypted email on one machine. I don&#39;t enable all my machines bec=
ause it is a hassle and the keys expire etc.</div>
<div><br></div><div>Sending me a message TLS encrypted, I can only decrypt =
at the inbound mail server. A PGP or S/MIME message could be decrypted at t=
he inbound mail server OR at the mail client depending on what gives the be=
st balance of performance / security / spam control / compliance and conven=
ience.</div>
<div><br></div><div><br></div><div>The other advantage to using message lay=
er security is that it is possible to force use of encryption. So for examp=
le, let us imagine that I have an outbound mail server that knows how to re=
solve key identifiers to public keys using some protocol (Vcard, WebFinger,=
 WKS, wev). I can poke the outbound mail server to automatically encrypt me=
ssages if the email address has a particular escape code in it. At the mome=
nt I am using a question mark.</div>
<div><br></div><div><br></div><div>Let us imagine I want to send an email m=
essage to Jacob that I want to be sent encrypted or not at all. I would use=
 the address ?<span style=3D"color:rgb(119,119,119);font-family:&#39;normal=
 arial&#39;,sans-serif;font-size:11.818181991577148px">jacob</span><span st=
yle=3D"color:rgb(119,119,119);font-family:&#39;normal arial&#39;,sans-serif=
;font-size:11.818181991577148px">@<a href=3D"http://appelbaum.net">appelbau=
m.net</a></span>=A0which tells my outbound mail server &#39;use whatever re=
solution services are available to find a key and if a trustworthy key can =
be found use it to send the message, otherwise report a delivery failure.</=
div>
<div><br></div><div><br></div><div>If I really want to be sure that the key=
 is correct then I would explicitly specify the key fingerprint:</div><div>=
<pre style=3D"white-space:pre-wrap;color:rgb(0,0,0)">228F-AD20-3DE9-AE7D-84=
E2-5265-CF9A-6F91-4193-A197<span style=3D"font-family:arial;color:rgb(34,34=
,34)">?</span><span style=3D"color:rgb(119,119,119);font-family:&#39;normal=
 arial&#39;,sans-serif;font-size:11.818181991577148px">jacob</span><span st=
yle=3D"color:rgb(119,119,119);font-family:&#39;normal arial&#39;,sans-serif=
;font-size:11.818181991577148px">@<a href=3D"http://appelbaum.net">appelbau=
m.net</a></span></pre>
</div><div><br></div><div>The nice thing about this approach is that I can =
use it with all my unmodified mail accounts and mail clients. All that I do=
 is to redirect the outbound mail service through my trusted outbound mail =
gateway (which is on 127.0.0.1 on most of my machines). I could even send m=
essages through my Gmail account (but would have to use a non Webmail clien=
t to compose and send).</div>
<div><br></div><div>Receiving mail requires me to either use a mail client =
with my S/MIME cert loaded or an S/MIME viewer for WebMail.</div><div><br><=
/div><div><br></div><div>At the moment this is a crazy hybrid of S/MIME and=
 PGP approaches. But the fact is that S/MIME has pervasive deployment while=
 PGP has a userbase. Plug ins are a hack for testing purposes only, any sec=
urity scheme that depends on typical users deploying a plug in is going to =
fail. It is painful enough dealing with the vagaries of the platform and ap=
plication update mechanisms changing stuff on a daily basis without a layer=
 of plug ins to cope with on top.=A0</div>
<div><br></div><div><br></div></div>

--001a11c3db74fe225804e9a83ae0--

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Cc: perpass <perpass@ietf.org>, Jacob Appelbaum <jacob@appelbaum.net>
Subject: Re: [perpass] OpenPGP Server-side Signed E-mail [Was: e-mail security idea: server2server PGP]
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On Sat, 26 Oct 2013, Phillip Hallam-Baker wrote:

> I can't see much point in applying and removing PGP and/or S/MIME at the start and end of the TLS tunnel.

Exactly. If you do that, you should encrypt it to the _recipients_
private key, not some random mailserver's private key.

which brings us back to draft-wouters-dane-openpgp-01

Paul


From datapacrat@gmail.com  Sat Oct 26 11:48:43 2013
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On Sat, Oct 26, 2013 at 1:31 PM, Phillip Hallam-Baker <hallam@gmail.com> wrote:

> The other advantage to using message layer security is that it is possible
> to force use of encryption. So for example, let us imagine that I have an
> outbound mail server that knows how to resolve key identifiers to public
> keys using some protocol (Vcard, WebFinger, WKS, wev). I can poke the
> outbound mail server to automatically encrypt messages if the email address
> has a particular escape code in it. At the moment I am using a question
> mark.

Would it be worthwhile to try to include as many ways of turning
identifiers into keys as possible, to compare and contrast, to make it
as difficult as feasible for any particular MITM to subvert all of
them? Or should the server simply go through a list of possible key
sources until it finds one; or should a particular form of key
retrieval be set as the only method?



Thank you for your time,
--
DataPacRat
"Then again, I could be wrong."

From hallam@gmail.com  Sat Oct 26 13:32:11 2013
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--001a11c32e88a6407704e9aac2ca
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On Sat, Oct 26, 2013 at 2:37 PM, Paul Wouters <paul@cypherpunks.ca> wrote:

> On Sat, 26 Oct 2013, Phillip Hallam-Baker wrote:
>
>  I can't see much point in applying and removing PGP and/or S/MIME at the
>> start and end of the TLS tunnel.
>>
>
> Exactly. If you do that, you should encrypt it to the _recipients_
> private key, not some random mailserver's private key.
>
> which brings us back to draft-wouters-dane-openpgp-01


I don't see much point in trying to couple DANE to PGP.

I don't care about sending mail to  cypherpunks.ca <paul@cypherpunks.ca>, I
care about sending it to Paul Wouters.

Except in very rare instances where an individual controls the domain or if
I am sending to an enterprise, the domain is going to be pretty much
irrelevant to authenticating the key.


Locking down the mailserver key with DANE makes prefect sense. In fact that
is the only reason I can see to do DNSSEC right now.



-- 
Website: http://hallambaker.com/

--001a11c32e88a6407704e9aac2ca
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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Sat, Oct 26, 2013 at 2:37 PM, Paul Wouters <span dir=3D"ltr">&lt=
;<a href=3D"mailto:paul@cypherpunks.ca" target=3D"_blank">paul@cypherpunks.=
ca</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div class=3D"im">On Sat, 26 Oct 2013, Phillip Hallam-Bake=
r wrote:<br>

<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
I can&#39;t see much point in applying and removing PGP and/or S/MIME at th=
e start and end of the TLS tunnel.<br>
</blockquote>
<br></div>
Exactly. If you do that, you should encrypt it to the _recipients_<br>
private key, not some random mailserver&#39;s private key.<br>
<br>
which brings us back to draft-wouters-dane-openpgp-01</blockquote><div><br>=
</div><div>I don&#39;t see much point in trying to couple DANE to PGP.</div=
><div><br></div><div>I don&#39;t care about sending mail to =A0<a href=3D"m=
ailto:paul@cypherpunks.ca" target=3D"_blank">cypherpunks.ca</a>, I care abo=
ut sending it to Paul Wouters.</div>
<div><br></div><div>Except in very rare instances where an individual contr=
ols the domain or if I am sending to an enterprise, the domain is going to =
be pretty much irrelevant to authenticating the key.=A0</div><div><br></div=
>
</div><div><br></div><div>Locking down the mailserver key with DANE makes p=
refect sense. In fact that is the only reason I can see to do DNSSEC right =
now.=A0</div><div><br></div><div><br></div><div><br></div>-- <br>Website: <=
a href=3D"http://hallambaker.com/">http://hallambaker.com/</a><br>

</div></div>

--001a11c32e88a6407704e9aac2ca--

From avri@acm.org  Sun Oct 27 07:43:28 2013
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Hi

>  "Can a gay kid in Uganda use this safely?"

(though Uganda can be substituted by many other place names.)

I can think of few better touchstones.  I have been working with some =
people in Uganda and elswhere and I think you hit the nail on the head.

There is a real problem with any privacy measure that singles out =
someone as using it in a country where they can bust down your door just =
because you made them curious.

avri


On 19 Oct 2013, at 21:21, Ted Hardie wrote:

> Like most folks involved in this list, I have a personal response to =
the current situation and some thoughts on how it will impact my or our =
work in the future.  Since I expect we will pretty short of mic time in =
Vancouver for thoughts like these, I decided to write them out.
>=20
> http://tools.ietf.org/html/draft-hardie-perpass-touchstone-00
>=20
> is the result.  It's quite short but a quick summary is this:
>=20
> Pervasive monitoring induces self-censoring which harms the Internet =
and its users.  At the scale of the modern Internet, that means it harms =
humanity.
>=20
> We can and should change our approach to Internet engineering and =
system design to deal with this.  There will be costs for that, but we =
should pay them.
>=20
> It helps me, personally, to focus on a single user when asking whether =
a system or protocol is appropriate in the current environment.  The =
draft lays out why.
>=20
> regards,
>=20
> Ted Hardie
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


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From tobias.gondrom@gondrom.org  Sun Oct 27 13:47:52 2013
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From: Tobias Gondrom <tobias.gondrom@gondrom.org>
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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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First, I like Mike's idea in principle.

I still see one interesting problem with this (and have no idea how to
solve it):
The widespread use case of zero-footprint clients, aka webmail:
if you have no client / your client is a browser window for webmail, you
have to upload your private key to the server (and must store it there).
I.e. you would upload your private key to Google and other mail
providers. And a part of PRISM was/is to deploy direct access points on
these servers in the first place. With the access to all webmail servers
and through this to all private keys there, PRISM would at the same time
also retain full access to emails received on full-clients. So while
this might help us against spam, we might in the end not be much better
off against pervasive state-driven surveillance. Or am I missing something?

Best regards, Tobias




Re: [perpass] A proposal for developing PRISM-Proof email (default deny)


> That is handled by the underlying program you are using to encrypt
> your mail, and so has nothng to do with this proposal directly - it's
> implementation dependent. Out of scope.

I agree that this problem is out of scope, but it is very important
nonetheless. Every time someone hits upon a bright idea to make encrypted
communication easier to use they run up against the problem of improving key
management.

[RS> ]  +1  Thank you for pointing that out.  It's the one of the core
problems usabiligy and implementation. "We have met the enemy and it is us."




These schemes, however, only work if the user has access everywhere to their
list of trusted keys. Essentially, the authenticity problem gets transformed
into an availability problem, and the availability problem is perhaps even
harder.

Three different free software projects try to securely tackle the
availability problem and could form the basis for an agnostic protocol for
portable and secure data sync:

(1) Firefox Sync https://www.mozilla.org/en-US/mobile/sync/
(2) SpiderOak's Crypton https://crypton.io/
(3) LEAP's Soledad https://leap.se/en/soledad

All of these are overkill for the narrow problem of key management.
Instead, they try to tackle the general question of secure data
synchronization and backup. I think this is probably the proper approach.

Our hope with the next version of Soledad is to add federation, so that two
or more users on different providers could share a synchronized, searchable,
client encrypted database. This could be useful for all kinds of things.

-elijah
_______________________________________________
perpass mailing list
perpass at ietf.org
https://www.ietf.org/mailman/listinfo/perpass



From derhoermi@gmx.net  Sun Oct 27 17:16:06 2013
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From: Bjoern Hoehrmann <derhoermi@gmx.net>
To: Tobias Gondrom <tobias.gondrom@gondrom.org>
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* Tobias Gondrom wrote:
>The widespread use case of zero-footprint clients, aka webmail:
>if you have no client / your client is a browser window for webmail, you
>have to upload your private key to the server (and must store it there).
>I.e. you would upload your private key to Google and other mail
>providers. And a part of PRISM was/is to deploy direct access points on
>these servers in the first place. With the access to all webmail servers
>and through this to all private keys there, PRISM would at the same time
>also retain full access to emails received on full-clients. So while
>this might help us against spam, we might in the end not be much better
>off against pervasive state-driven surveillance. Or am I missing something?

It is of course possible to keep the keys on the client and it would
also be possible to develop new web browser features to keep certain
data unknowable to the site you are visiting, with some limitations. 

Acme Inc would of course still take your keys to help you synchronise
them across devices, or as backup, or to use them as another factor
in new multi-factor authentication schemes, or simply because they've
been ordered to do so. Perhaps through the DRM system where it would
be hard to notice, or the surveillance software that ostensibly makes
sure we are unable to cheat in browser games (that's coming, right?)
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

From stpeter@stpeter.im  Sun Oct 27 20:32:13 2013
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Subject: [perpass] Fwd: [jdev] TLS Everywhere
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Just FYI...


- -------- Original Message --------
Subject: [jdev] TLS Everywhere
Date: Sun, 27 Oct 2013 21:23:08 -0600
From: Peter Saint-Andre <stpeter@stpeter.im>
Reply-To: Jabber/XMPP software development list <jdev@jabber.org>
To: jdev@jabber.org

Almost 15 years have passed since my friend Jeremie Miller released
the initial version of the jabberd IM server, launching the Jabber
open-source community and the technology we know today as XMPP. Yet,
all that time, hop-by-hop encryption using SSL/TLS has been optional
on the XMPP network. A number of server operators and software
developers in the XMPP community have decided that needs to change for
the better. Based on discussions at the XMPP Summit last week in
Portland, Oregon, I have drafted a plan for upgrading the XMPP network
to always-on, mandatory, ubiquitous encryption. You can find it here:

https://github.com/stpeter/manifesto

In short: we owe it to those who use XMPP technologies to improve the
security of the network (and thanks to Thijs Alkemade, we now have
better ways to test such security, using the newly-launched "IM
Observatory" at xmpp.net). Although we know that channel encryption is
not the complete answer, it's the right thing to do because it will
help to protect people's communications from prying eyes.

If you or your organization develop XMPP-compatible software or run a
service that's connected to the XMPP network, I encourage you to sign
the statement by following the instructions in the README at the URL
shown above.

Thanks!

Peter
_______________________________________________
JDev mailing list
Info: http://mail.jabber.org/mailman/listinfo/jdev
Unsubscribe: JDev-unsubscribe@jabber.org
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From ned+perpass@mrochek.com  Sun Oct 27 22:53:47 2013
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In-reply-to: "Your message dated Sat, 26 Oct 2013 05:13:04 -0700" <20131026121304.GS94140@funkthat.com>
References: <7B180BF5-47CB-4821-82DA-773A1C38D548@gmail.com> <20131023200227.GB94140@funkthat.com> <63250A53-FE97-4530-B75D-60A1192D7C5D@gmail.com> <52683DDF.9030407@rolamasao.org> <20131023213555.GE94140@funkthat.com> <526841F3.4040505@rolamasao.org> <47EC7968-F4DD-42D9-BEAA-9435A010CECB@emc.com> <52696123.9000209@rolamasao.org> <alpine.LFD.2.10.1310251405160.17704@bofh.nohats.ca> <526B8A36.2090707@appelbaum.net> <20131026121304.GS94140@funkthat.com>
To: John-Mark Gurney <jmg@funkthat.com>
Cc: perpass@ietf.org, Jacob Appelbaum <jacob@appelbaum.net>
Subject: Re: [perpass] OpenPGP Server-side Signed E-mail [Was: e-mail	security idea: server2server PGP]
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> Jacob Appelbaum wrote this message on Sat, Oct 26, 2013 at 09:24 +0000:
> > Paul Wouters:
> > > On Thu, 24 Oct 2013, Noel Torres wrote:
> > >
> > >> The promised rough draft:
> > >
> > >> Initial Draft about OpenPGP Server-side Signed E-mail (OPSS e-mail)
> > >
> > > I don't understand how this adds anything to STARTTLS with TLSA/DNSSEC,
> > > apart from being able to get a remote server key from a HKP server,
> > > which in itself is completely untrusted without web-of-trust
> > > verification by a human.
> > >
> > > In fact, TLS with DHE would be more secure agaisnt a pervasive monitor
> > > that obtains access to a mailserver's private openpgp key.
> > >
> > > What would doing openpgp encryption within TLS add security wise?
> > >
> >
> > Defense in depth. If the StartTLS server uses RC4, for example, I'd want
> > a different layer for actual protection.

> If the admin spent the time to configure OPSS, why not configure TLS
> properly in the first place?

To be fair, that's a bit of a problem right now. The issue is you don't  really
want to flat-out disable RC4 ciphersuites because there may be some clients
that don't have anything else, and RC4 is better than nothing.

But at the same time you don't want to use an RC4 ciphersuite unless there's no
alternative - and there usually is. The problem here is that specifying a
preference order for ciphersuite use is a problem with some implementation
currently. As I noted previously, you want to prefer something with DHE when
possible and AES to RC4.

That said, in terms of standardization, I think the priority should be to
get the SSL/TLS stuff done. And then folks can start beating up on the
implementors to get a better grade of SSL/TLS in place.

				Ned

From huitema@huitema.net  Sun Oct 27 23:37:57 2013
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To: "'perpass'" <perpass@ietf.org>
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Subject: [perpass] Traffic analysis
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A few weeks ago, we had a brief exchange on this list about traffic
analysis, specifically the collection and analysis of IP packet headers. I
wanted to write a draft describing the issue and proposing solutions, but
the day job interfered and I was delayed. With that, I missed the cutoff
date by many days. But the good news is that I finally wrote a first cut of
this draft, and put it on a personal web server:



              Passive Traffic Analysis Threats and Defense
                draft-huitema-perpass-analthreat-00.txt

Abstract

   Traffic analysis is used by various entities to derive "meta data"
   about Internet communications, such as who communicates with whom or
   what, and when.  We analyze how meta-data can be extracted by
   monitoring IP headers, DNS traffic, and clear-text headers of
   commonly used protocols.  We then propose a series of actions that
   would make traffic analysis more difficult.

Available for now at:
http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt

I am sure that this draft could be much improved with feedback from this
list!

-- Christian Huitema



 


From mdietf@demmers.org  Mon Oct 28 02:51:28 2013
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Date: Mon, 28 Oct 2013 02:50:55 -0700
From: Mike Demmers <mdietf@demmers.org>
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Subject: Re: [perpass] A proposal for developing PRISM-Proof email (default deny)
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On Sun, 27 Oct 2013 20:47:14 +0000
Tobias Gondrom <tobias.gondrom@gondrom.org> wrote:

The draft I am working on does not really cover this. It is very specifically about making encrypted email practical in a general sense concerning solving the 'encrypted email cannot be spam filtered' and similar problems, regardless of the underlying methods.

The webmail problem may not be such a big problem, I am not sure about this but my impression, despite the high webmail use for these large services, is that very large numbers of emails, perhaps the majority, are still not from webmail. That many or most people may have a webmail account, but it is not their _only_ account, they still typically have mail service through their isp using a more traditional MUA - and that is likely what would be used for emails where privacy is desired. I'd like to see the real numbers on this ratio. 

Even when webmail is used, however, the browser is running on your own computer. So it seems likely to me that something like a browser plugin could encode/decode the body of your emails in the browser input area or viewing area before it is sent or after it is received. The keys could then still be on the local machine. And the remote service (and associated spy agency) would see only an encrypted email body.

-Mike


> First, I like Mike's idea in principle.
> 
> I still see one interesting problem with this (and have no idea how to
> solve it):
> The widespread use case of zero-footprint clients, aka webmail:
> if you have no client / your client is a browser window for webmail, you
> have to upload your private key to the server (and must store it there).
> I.e. you would upload your private key to Google and other mail
> providers. And a part of PRISM was/is to deploy direct access points on
> these servers in the first place. With the access to all webmail servers
> and through this to all private keys there, PRISM would at the same time
> also retain full access to emails received on full-clients. So while
> this might help us against spam, we might in the end not be much better
> off against pervasive state-driven surveillance. Or am I missing something?
> 
> Best regards, Tobias


From stephen.farrell@cs.tcd.ie  Mon Oct 28 08:58:31 2013
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On 10/28/2013 03:31 AM, Peter Saint-Andre wrote:
> Just FYI...

Good stuff. I wonder if there are other communities that could
make similar plans? Be good if so. Or if some already have be
great to hear about 'em.

Why May 19 2014? (Just curious.)

S.

> 
> 
> -------- Original Message -------- Subject: [jdev] TLS Everywhere 
> Date: Sun, 27 Oct 2013 21:23:08 -0600 From: Peter Saint-Andre
> <stpeter@stpeter.im> Reply-To: Jabber/XMPP software development
> list <jdev@jabber.org> To: jdev@jabber.org
> 
> Almost 15 years have passed since my friend Jeremie Miller
> released the initial version of the jabberd IM server, launching
> the Jabber open-source community and the technology we know today
> as XMPP. Yet, all that time, hop-by-hop encryption using SSL/TLS
> has been optional on the XMPP network. A number of server operators
> and software developers in the XMPP community have decided that
> needs to change for the better. Based on discussions at the XMPP
> Summit last week in Portland, Oregon, I have drafted a plan for
> upgrading the XMPP network to always-on, mandatory, ubiquitous
> encryption. You can find it here:
> 
> https://github.com/stpeter/manifesto
> 
> In short: we owe it to those who use XMPP technologies to improve
> the security of the network (and thanks to Thijs Alkemade, we now
> have better ways to test such security, using the newly-launched
> "IM Observatory" at xmpp.net). Although we know that channel
> encryption is not the complete answer, it's the right thing to do
> because it will help to protect people's communications from prying
> eyes.
> 
> If you or your organization develop XMPP-compatible software or run
> a service that's connected to the XMPP network, I encourage you to
> sign the statement by following the instructions in the README at
> the URL shown above.
> 
> Thanks!
> 
> Peter _______________________________________________ JDev mailing
> list Info: http://mail.jabber.org/mailman/listinfo/jdev 
> Unsubscribe: JDev-unsubscribe@jabber.org 
> _______________________________________________
> 
> 
> _______________________________________________ perpass mailing
> list perpass@ietf.org 
> https://www.ietf.org/mailman/listinfo/perpass
> 
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From stephen.farrell@cs.tcd.ie  Mon Oct 28 09:04:34 2013
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Thanks Christian,

Now that we seem to be getting a bit of a handle on the TLS
related crypto parts of all this, (which are maybe easier
or more tractable), I think it'd be timely to see some list
discussion on traffic analysis before Vancouver.

I'd be interested in any less obvious ways in which IETF
protocols might be making traffic analysis easier than it
ought be. And of course in countermeasures, but those are
maybe quite difficult.

S.

On 10/28/2013 06:37 AM, Christian Huitema wrote:
> A few weeks ago, we had a brief exchange on this list about traffic
> analysis, specifically the collection and analysis of IP packet headers. I
> wanted to write a draft describing the issue and proposing solutions, but
> the day job interfered and I was delayed. With that, I missed the cutoff
> date by many days. But the good news is that I finally wrote a first cut of
> this draft, and put it on a personal web server:
> 
> 
> 
>               Passive Traffic Analysis Threats and Defense
>                 draft-huitema-perpass-analthreat-00.txt
> 
> Abstract
> 
>    Traffic analysis is used by various entities to derive "meta data"
>    about Internet communications, such as who communicates with whom or
>    what, and when.  We analyze how meta-data can be extracted by
>    monitoring IP headers, DNS traffic, and clear-text headers of
>    commonly used protocols.  We then propose a series of actions that
>    would make traffic analysis more difficult.
> 
> Available for now at:
> http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt
> 
> I am sure that this draft could be much improved with feedback from this
> list!
> 
> -- Christian Huitema
> 
> 
> 
>  
> 
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 

From benl@google.com  Mon Oct 28 10:00:07 2013
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From: Ben Laurie <benl@google.com>
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Subject: Re: [perpass] Traffic analysis
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On 28 October 2013 06:37, Christian Huitema <huitema@huitema.net> wrote:

> A few weeks ago, we had a brief exchange on this list about traffic
> analysis, specifically the collection and analysis of IP packet headers. I
> wanted to write a draft describing the issue and proposing solutions, but
> the day job interfered and I was delayed. With that, I missed the cutoff
> date by many days. But the good news is that I finally wrote a first cut of
> this draft, and put it on a personal web server:
>
>
>
>               Passive Traffic Analysis Threats and Defense
>                 draft-huitema-perpass-analthreat-00.txt
>
> Abstract
>
>    Traffic analysis is used by various entities to derive "meta data"
>    about Internet communications, such as who communicates with whom or
>    what, and when.  We analyze how meta-data can be extracted by
>    monitoring IP headers, DNS traffic, and clear-text headers of
>    commonly used protocols.  We then propose a series of actions that
>    would make traffic analysis more difficult.
>
> Available for now at:
> http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt
>
> I am sure that this draft could be much improved with feedback from this
> list!


You might want to look at the cleartext portions of the TLS handshake.

--001a11c1e980e9a00504e9d007a0
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On 28 October 2013 06:37, Christian Huitema <span dir=3D"ltr">&lt;<=
a href=3D"mailto:huitema@huitema.net" target=3D"_blank">huitema@huitema.net=
</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">A few weeks ago, we had a brief exchange on =
this list about traffic<br>
analysis, specifically the collection and analysis of IP packet headers. I<=
br>
wanted to write a draft describing the issue and proposing solutions, but<b=
r>
the day job interfered and I was delayed. With that, I missed the cutoff<br=
>
date by many days. But the good news is that I finally wrote a first cut of=
<br>
this draft, and put it on a personal web server:<br>
<br>
<br>
<br>
=A0 =A0 =A0 =A0 =A0 =A0 =A0 Passive Traffic Analysis Threats and Defense<br=
>
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 draft-huitema-perpass-analthreat-00.txt<br>
<br>
Abstract<br>
<br>
=A0 =A0Traffic analysis is used by various entities to derive &quot;meta da=
ta&quot;<br>
=A0 =A0about Internet communications, such as who communicates with whom or=
<br>
=A0 =A0what, and when. =A0We analyze how meta-data can be extracted by<br>
=A0 =A0monitoring IP headers, DNS traffic, and clear-text headers of<br>
=A0 =A0commonly used protocols. =A0We then propose a series of actions that=
<br>
=A0 =A0would make traffic analysis more difficult.<br>
<br>
Available for now at:<br>
<a href=3D"http://huitema.net/papers/draft-huitema-perpass-analthreat-00.tx=
t" target=3D"_blank">http://huitema.net/papers/draft-huitema-perpass-analth=
reat-00.txt</a><br>
<br>
I am sure that this draft could be much improved with feedback from this<br=
>
list!</blockquote><div><br></div><div>You might want to look at the clearte=
xt portions of the TLS handshake.</div><div><br></div></div></div></div>

--001a11c1e980e9a00504e9d007a0--

From hannes.tschofenig@gmx.net  Mon Oct 28 10:10:36 2013
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Hi all,

I have submitted a document for the cutoff-date that tries to provide 
background material for the IAB technical plenary. The document does not 
suggest what actions to take but contains my view about the bigger picture.

Based on the received feedback I have produced a new version, which can 
be found here:
https://raw.github.com/hannestschofenig/tschofenig-ids/master/surveillance/draft-tschofenig-perpass-surveillance-01.txt

or

https://goo.gl/a35BY2

Ciao
Hannes

From stephen.farrell@cs.tcd.ie  Mon Oct 28 10:14:47 2013
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On 10/28/2013 05:00 PM, Ben Laurie wrote:
> You might want to look at the cleartext portions of the TLS handshake.

Actually, I'd like to suggest we don't shift the discussion here
back to better use of crypto.

Let's assume that we do get better/wider deployment of TLS 1.3
with a PFS ciphesuite for all the various protocols where that's
tractable. And assume TLS 1.3 hides a lot more of the handshake
as planned.

After that's done, *then* what do we want/need to do about
traffic analysis?

That's a question I'd like to see discussed and Christian's
text is helpful there (as are Brian's and Hannes' drafts).

Cheers,
S.


From lear@cisco.com  Mon Oct 28 10:23:30 2013
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On 10/26/13 11:24 AM, Jacob Appelbaum wrote:
> Defense in depth. If the StartTLS server uses RC4, for example, I'd want
> a different layer for actual protection.
>
>
Let's be careful about that argument.  Defense in depth should actually
add real depth.  Otherwise it's just extra work to send a message.  If
you suggest a new mechanism just to get rid of a bad algorithm, whatever
you replace it with will likely someday be found to have a bad algorithm
as well.  To what depths shall we sink, then?

Eliot

From joe@oregon.uoregon.edu  Mon Oct 28 10:37:34 2013
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Hi,

Stephen Farrell <stephen.farrell@cs.tcd.ie> commented:

#Now that we seem to be getting a bit of a handle on the TLS
#related crypto parts of all this, (which are maybe easier
#or more tractable), I think it'd be timely to see some list
#discussion on traffic analysis before Vancouver.
#
#I'd be interested in any less obvious ways in which IETF
#protocols might be making traffic analysis easier than it
#ought be. And of course in countermeasures, but those are
#maybe quite difficult.

Just to quickly summarize a few traffic analytic approaches 
(e.g., analyses that do not consider the contents of traffic) 
at the 10,000 ft level:

-- Sometimes merely knowing that a communication is happening
   between two particular parties conveys significant 
   information.

   A classic example: a government official in a sensitive 
   role begins exchanging non-official messages with a known 
   agent of a foreign power (or an investigative journalist).
   If that was noted, a big red flag might well go up.

-- Sometimes the frequency/volume of communications conveys 
   information that may signal something's afoot.

   For instance, normal traffic volume might be sporadic and 
   brief, but in a crisis period, message count and total 
   message volume might ramp up dramatically. (this is the
   classic "increased volume of chatter" comment sometimes
   mentioned in the press)

   Conversely, if "radio silence" suddenly descends, and
   communications that normally take place suddenly cease,
   that may also be a signal that something's happening.

-- Sequencing can also sometimes be important. Imagine a 
   situation where a report from party A is received by "HQ."

   Shortly thereafter, communications fan out from "HQ" to 
   parties B through Z, perhaps coincidentally, perhaps not.

   If that pattern repeats itself multiple times, we might
   infer that party A is at least somehow "related to" the 
   activities of parties B through Z, in an extreme case, 
   perhaps going so far as to direct the activities of those 
   entities.

How might we hypothetically counter those traffic analytic approaches?
At a very simple level:

-- If the worry is that person-to-person messages unduly
   expose relationships or contacts that might be red flags:

   -- avoid phone calls, emails, IM, and other person-to-person 
   communication channels, 

   -- use one-to-many communications instead (post to Usenet
   News, comment on a web page, send a twitter message, etc.)

-- If communication volume ("chatter") is the issue, send a 
   constant stream of traffic, regardless of whether things
   are sleepy and routine or the exact opposite.

   (FWIW, obviously most IETF protocols are NOT designed to send 
   a constant stream of traffic...)

-- If sequencing is the issue, decouple cause and effect in 
   time or space. If "A" contacts "HQ" and "HQ" then normally
   contacts "B" through "Z", maybe always have HQ send messages 
   to B through Z (and AA-ZZ!) regardless of whether or not A 
   sends a message to HQ or not

Is that the sort of thing you wanted to begin discussing?

Regards,

Joe

From stephen.farrell@cs.tcd.ie  Mon Oct 28 10:47:42 2013
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Hiya,

On 10/28/2013 04:11 PM, Joe St Sauver wrote:
> Hi,
> 
> Stephen Farrell <stephen.farrell@cs.tcd.ie> commented:
> 
> #Now that we seem to be getting a bit of a handle on the TLS
> #related crypto parts of all this, (which are maybe easier
> #or more tractable), I think it'd be timely to see some list
> #discussion on traffic analysis before Vancouver.
> #
> #I'd be interested in any less obvious ways in which IETF
> #protocols might be making traffic analysis easier than it
> #ought be. And of course in countermeasures, but those are
> #maybe quite difficult.
> 
> Just to quickly summarize a few traffic analytic approaches 
> (e.g., analyses that do not consider the contents of traffic) 
> at the 10,000 ft level:
> 
[...reasonable text elided...]
> 
> Is that the sort of thing you wanted to begin discussing?

Yep. But not at the 10,000ft level:-)

Not quite sure, but I think we might get some benefit at the
moment from considering how specific fields in real protocols
undermine privacy (e.g. as Christian's draft does with the
Received header fields in mail messages) even if/when TLS or
other existing security mechanisms are properly used.

That's not to say that we should immediately try change all
those protocols, since there will likely be (or were once)
good reasons why stuff is done as it is, but there may be
cases where we find that there are specific concrete things
the IETF could be doing and finding those is the goal of our
session in Vancouver.

S.

> 
> Regards,
> 
> Joe
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

From joe@oregon.uoregon.edu  Mon Oct 28 11:23:17 2013
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From: "Joe St Sauver" <joe@oregon.uoregon.edu>
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Hi,

Stephen Farrell <stephen.farrell@cs.tcd.ie>:

#Not quite sure, but I think we might get some benefit at the
#moment from considering how specific fields in real protocols
#undermine privacy (e.g. as Christian's draft does with the
#Received header fields in mail messages) even if/when TLS or
#other existing security mechanisms are properly used.

My concern is that many traffic analytic approaches tend to be 
exceedingly robust to "protocol improvements." Protocol tweaks 
may accomplish little when it comes to practically improving 
privacy if the underlying protocol's architecture and operational 
practice goes unchanged. 

For example, when it comes to email, shouldn't section 6 of
http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt
basically say, "if you want to avoid traffic analytic approaches
in the case of email, deploy and use Mixmaster anonymous remailers"? 
( https://en.wikipedia.org/wiki/Anonymous_remailers#Untraceable_remailers )

And if we *are* talking about that sort of approach, then I think
inevitably we also need to talk about how we simultaneously manage to
allow *wanted* private traffic while simultaneously preventing or 
managing *unwanted traffic* (e.g., spam). 

An awful lot of current anti-spam technology depends upon either 
reputation (which is obviously not present in the case of 
anonymous/non-attributable traffic), or content analysis (which 
is also obviously problematic, at least if we presume use of 
end-to-end encryption (at least until the content is decrypted 
on the end-user's device)).

I also think that if you're serious about email privacy, you 
really can't keep the discussion just at the level of sanitizing 
headers. You need to get into the format of the content that's
allowed as well. For example, it's well known that non-plain 
text email content (e.g., HTML-formatted email) is potentially a 
serious threat to privacy due to potential use of things like 
tracking gifs included in HTML-formatted email.

Regards,

Joe

From stephen.farrell@cs.tcd.ie  Mon Oct 28 12:03:57 2013
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Hiya,

On 10/28/2013 05:49 PM, Joe St Sauver wrote:
> Hi,
> 
> Stephen Farrell <stephen.farrell@cs.tcd.ie>:
> 
> #Not quite sure, but I think we might get some benefit at the
> #moment from considering how specific fields in real protocols
> #undermine privacy (e.g. as Christian's draft does with the
> #Received header fields in mail messages) even if/when TLS or
> #other existing security mechanisms are properly used.
> 
> My concern is that many traffic analytic approaches tend to be 
> exceedingly robust to "protocol improvements." Protocol tweaks 

Not all changes need be tweaks. Some might be though.

> may accomplish little when it comes to practically improving 
> privacy if the underlying protocol's architecture and operational 
> practice goes unchanged. 
> 
> For example, when it comes to email, 

To be honest, I don't see how we can "fix" mail myself so
that its not vulnerable to pervasive monitoring. I think
we can make such monitoring somewhat harder via better use
of TLS, and that's worth doing, but beyond that, I don't
see much that can be done without changes that I don't
think are likely to happen. I'd be delighted to be proven
wrong on that, so I'm happy to see it discussed but I'm
not hopeful.

Meanwhile, there are plenty of other protocols that are
also worth a look and might be more easily improved in
this respect, so even if mail isn't tractable, other things
may well be.

S.

> shouldn't section 6 of
> http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt
> basically say, "if you want to avoid traffic analytic approaches
> in the case of email, deploy and use Mixmaster anonymous remailers"? 
> ( https://en.wikipedia.org/wiki/Anonymous_remailers#Untraceable_remailers )
> 
> And if we *are* talking about that sort of approach, then I think
> inevitably we also need to talk about how we simultaneously manage to
> allow *wanted* private traffic while simultaneously preventing or 
> managing *unwanted traffic* (e.g., spam). 
> 
> An awful lot of current anti-spam technology depends upon either 
> reputation (which is obviously not present in the case of 
> anonymous/non-attributable traffic), or content analysis (which 
> is also obviously problematic, at least if we presume use of 
> end-to-end encryption (at least until the content is decrypted 
> on the end-user's device)).
> 
> I also think that if you're serious about email privacy, you 
> really can't keep the discussion just at the level of sanitizing 
> headers. You need to get into the format of the content that's
> allowed as well. For example, it's well known that non-plain 
> text email content (e.g., HTML-formatted email) is potentially a 
> serious threat to privacy due to potential use of things like 
> tracking gifs included in HTML-formatted email.
> 
> Regards,
> 
> Joe
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 

From stephen.farrell@cs.tcd.ie  Mon Oct 28 12:18:04 2013
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FYI. We don't plan on having remote presenters or to take audio
input, (since it doesn't work well), but this gives another
option for remote folks in addition to the usual audio streaming
and jabber.

Out of interest: if you know already that you'll be remote and
plan to listen in and/or join us via jabber, feel free to let
me know offlist. I guess that might be useful to the scribes as
well. But nobody has to ask anyone to listen in of course:-)

S.


-------- Original Message --------
Subject: Meetecho support at IETF-88
Date: Mon, 28 Oct 2013 16:46:45 +0100
From: Meetecho IETF support <ietf@meetecho.com>
To: ietf@meetecho.com

Dear chair(s),

this email is to confirm Meetecho support for your WG/BOF meeting
session at IETF-88.

The agenda of supported sessions is available at:
	http://ietf88.conf.meetecho.com.

If you plan to have remote presenters, you're kindly requested to inform
us in proper advance, since this needs special set-up and a preliminary
test with the remote speaker.

*The deadline for requesting remote presentation support is November 1.*

Thanks,
the Meetecho team

-- 
Meetecho s.r.l.
www.meetecho.com



From mdietf@demmers.org  Mon Oct 28 13:12:26 2013
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From: Mike Demmers <mdietf@demmers.org>
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Subject: Re: [perpass] Traffic analysis
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On Sun, 27 Oct 2013 23:37:39 -0700
"Christian Huitema" <huitema@huitema.net> wrote:

> Abstract
> 
>    Traffic analysis is used by various entities to derive "meta data"
>    about Internet communications, such as who communicates with whom or
>    what, and when.  We analyze how meta-data can be extracted by
>    monitoring IP headers, DNS traffic, and clear-text headers of
>    commonly used protocols.  We then propose a series of actions that
>    would make traffic analysis more difficult.
> 
> Available for now at:
> http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt

This is the best summary of the metadata problem I have seen.

I agree with this recommendation:

"Use encryption.  In particular, never send a user identity in clear text."

After that...problems.

Obfuscating sources may provide less metadata to spies, but it is also data that system administrators use every single day to protect their systems from viruses, spammers, and hackers. Remove too much of that and you have simply exchanged one problem for another, larger one.

There needs to be a section for all these proposals that deals with the practical real world barriers to implementing the proposed solutions. That way the proposals that might actually be possible to implement should be more identifiable.

The problem with the proposals I see for fixing the metadata problem through technical means is that in the end, to actually be effective, they all seem to boil down to 'We had to destroy the internet, in order to save it'.

I think there are small technical changes around the edges that can help, but I really see the solutions for the metadata problem as more political and social than technical. Concentrating on making encryption really, really easy to use would go a lot further at this time than messing with deep changes, because people are not even using what is already available.

-MD

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From: Vidya Narayanan <vn@google.com>
To: perpass@ietf.org
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Subject: [perpass] Explicit proxying in HTTP
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--047d7b677688bffd3d04e9d2d071
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All,
http://tools.ietf.org/id/draft-vidya-httpbis-explicit-proxy-ps-00.txt is a
problem statement on the need for explicit proxying in HTTP.  This is an
FYI for this group at the moment and it is a topic expected to be discussed
in the HTTPbis working group.  However, since it also relates to the
mission of the perpass list, I am sending a pointer.  I will not be at
Vancouver - however, my colleague, Ted Hardie has kindly volunteered to be
engaged in discussions on this topic, should there be any questions.

Abstract

   This document describes the issues with HTTP proxies for TLS
   protected traffic and motivates the need for explicit proxying
   capability in HTTP.  It also presents the goals that such a solution
   would need to satisfy and some example solution directions.


Best,
Vidya

--047d7b677688bffd3d04e9d2d071
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">All,<div><a href=3D"http://tools.ietf.org/id/draft-vidya-h=
ttpbis-explicit-proxy-ps-00.txt">http://tools.ietf.org/id/draft-vidya-httpb=
is-explicit-proxy-ps-00.txt</a> is a problem statement on the need for expl=
icit proxying in HTTP. =A0This is an FYI for this group at the moment and i=
t is a topic expected to be discussed in the HTTPbis working group. =A0Howe=
ver, since it also relates to the mission of the perpass list, I am sending=
 a pointer. =A0I will not be at Vancouver - however, my colleague, Ted Hard=
ie has kindly volunteered to be engaged in discussions on this topic, shoul=
d there be any questions.=A0</div>
<div><br></div><div><pre style=3D"color:rgb(0,0,0);word-wrap:break-word;whi=
te-space:pre-wrap">Abstract

   This document describes the issues with HTTP proxies for TLS
   protected traffic and motivates the need for explicit proxying
   capability in HTTP.  It also presents the goals that such a solution
   would need to satisfy and some example solution directions.</pre></div><=
div><br></div><div>Best,<br>Vidya=A0</div><div><br></div></div>

--047d7b677688bffd3d04e9d2d071--

From ned+perpass@mrochek.com  Mon Oct 28 13:28:51 2013
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To: Joe St Sauver <joe@oregon.uoregon.edu>
Cc: perpass@ietf.org, huitema@huitema.net, stephen.farrell@cs.tcd.ie
Subject: Re: [perpass] Traffic analysis
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> Hi,

> Stephen Farrell <stephen.farrell@cs.tcd.ie>:

> #Not quite sure, but I think we might get some benefit at the
> #moment from considering how specific fields in real protocols
> #undermine privacy (e.g. as Christian's draft does with the
> #Received header fields in mail messages) even if/when TLS or
> #other existing security mechanisms are properly used.

> My concern is that many traffic analytic approaches tend to be
> exceedingly robust to "protocol improvements." Protocol tweaks
> may accomplish little when it comes to practically improving
> privacy if the underlying protocol's architecture and operational
> practice goes unchanged.

> For example, when it comes to email, shouldn't section 6 of
> http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt
> basically say, "if you want to avoid traffic analytic approaches
> in the case of email, deploy and use Mixmaster anonymous remailers"?
> ( https://en.wikipedia.org/wiki/Anonymous_remailers#Untraceable_remailers )

And good luck with that, at least on any kind of scale.

But your underlying point is very well taken: The section on email in this
draft focuses on irrelevancies and fails to take note of the real issues.

I hate to sound like a broken record, but folks really need to have some
familiarity with present-day email as it is actually deployed before making
these sorts of asssessments.

Again, present day email usage is increasingly concentrated to a fairly small
number of large ISPs and MSPs. (Small ISPs and enterprise setups are shifting
to using cloud services, and while the Snowden revelations may have slowed this
trend, they haven't stopped it.)

In regards to traffic analysis, this is in some ways a good thing. If the
connections from user clients to the ISP/MSP servers are secured at the
transport layer - and I have demonstrated that a lot of them are - then we
gain a lot by securing the streams between the large providers at the
transport level.

But the elephant in the corner is logging. Service providers maintain very
extensive logs of email traffic, if for no other reason than as a support
tool. These logs provide every possible detail needed for traffic analysis.

Of course one of the earliest Snowden revelations was that the NSA is
collecting these logs from US providers on a massive scale. And hopefully
everyone is aware of Smith v. Maryland, which essentialls says that metadata
is not constitutionally protected.

But before Eupopeans and others get all smug about this, speaking as someone
who has seen quite a few RFPs for mail systems, the only substantive difference
I see between the US and elsewhere is the US approaches this in a less
organized and systematic way and generally has fewer auditing and data
protection requirements. The data is still being collected, and most likely
shareed.

And as for practical and deployable measures that can be undertaken to address
this, I'm at something of a loss to suggest anything. Shifting back to a more
decentralized model sounds nice, but seems a bit outside the purview of a
standards process to try and make that happen.

And even if it a completely decentralized model was practical, in a
peer-to-peer world the metadata that would accrue from watching the connections
themselves would be a fair substitute.

As for mixed models, look at what happened to Lavabit.

> And if we *are* talking about that sort of approach, then I think
> inevitably we also need to talk about how we simultaneously manage to
> allow *wanted* private traffic while simultaneously preventing or
> managing *unwanted traffic* (e.g., spam).

Yep. It's a daunting problem. And it is far from the only one.

> An awful lot of current anti-spam technology depends upon either
> reputation (which is obviously not present in the case of
> anonymous/non-attributable traffic), or content analysis (which
> is also obviously problematic, at least if we presume use of
> end-to-end encryption (at least until the content is decrypted
> on the end-user's device)).

You basically have to push the content checks to the client. This has
not proven to be a terrific solution in practice.

> I also think that if you're serious about email privacy, you
> really can't keep the discussion just at the level of sanitizing
> headers. You need to get into the format of the content that's
> allowed as well. For example, it's well known that non-plain
> text email content (e.g., HTML-formatted email) is potentially a
> serious threat to privacy due to potential use of things like
> tracking gifs included in HTML-formatted email.

I think we can do a lot to make it harder to snoop on email content, although
ironically what we're likely to be able to accomplish under the "prism-proof"
rubric is unlikely to much of anything about the data collection the actual
Prism program performs.

But traffic analysis... unless the fact that those logs are likely to only be
accessible to state entities offers some consolation, I don't think there's
going to be much happiness here.

				Ned

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Subject: Re: [perpass] Traffic analysis
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1


Steven, (others),

>> For example, when it comes to email,
> 
> To be honest, I don't see how we can "fix" mail myself so that its
> not vulnerable to pervasive monitoring. I think we can make such
> monitoring somewhat harder via better use of TLS, and that's worth
> doing, but beyond that, I don't see much that can be done without
> changes that I don't think are likely to happen. I'd be delighted
> to be proven wrong on that, so I'm happy to see it discussed but
> I'm not hopeful.

Is it within the purview of this list to discuss alternatives to, or
replacements for email as we currently know it? Or would that better
be proposed / discussed elsewhere so at to not dilute the topic at hand?

I also believe email as we generally know it is vulnerable to traffic
analysis even if we can encrypt the contents; there's just too much
observable metadata. Currently it seems to my somewhat limited
understanding that some combination of anonymous remailer systems and
properly configured VPN tunnels (and/or Tor perhaps...) are really the
only effective way to obscure your email traffic paths with our
existing systems. Traffic timing analysis is still an issue unless you
have either cover traffic (noise) or introduce a latency (delay) or
both (ala Mixminion / Pynchons Gate).

For the majority of average users, that still leaves you at the mercy
of the remailer operator and the VPN provider, and there are many
possible points of failure in using a VPN even without a Mallory or
Eve behind the scenes subverting your traffic.

That said, I'd still like to see the effort made in making existing
email as resistant as possible by default. Anything less is is a
disservice to the security of the user in general.

Regards,

Dave Nix

- --
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From stephen.farrell@cs.tcd.ie  Mon Oct 28 14:01:50 2013
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Hiya,

On 10/28/2013 08:42 PM, d.nix wrote:
> Is it within the purview of this list to discuss alternatives to,
> or replacements for email as we currently know it?

We've not been strict on this list to date. (That's
a secondary thing to talk about in Vancouver - should
we be more strict/focused on this list?)

My take fwiw, is that some discussion of how such things
might or might not be more resistant to pervasive
monitoring is ok. Doing detailed design of a more privacy
friendly alternative to mail on this list would be pointless
though - when would you be finished? So, if someone has
such a proposal then writing it up as an I-D that's
handled as usual is the thing to do... as usual:-)

Cheers,
S.
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From rutkowski.tony@gmail.com  Mon Oct 28 14:33:18 2013
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+1

It is ironic that until the mid-90s, analysis of metadata
on the backbones was the norm.  Furthermore, it will be
network operators, pursuant to their operational needs
and national legal obligations, that make metadata analysis
decisions

One gets the feel that much of the vetting on the list
is essentially prepassturbating.  Feels good intellectually
for some, but is otherwise not productive.

--tony

On 10/28/2013 4:12 PM, Mike Demmers wrote:
> The problem with the proposals I see for fixing the metadata problem through technical means is that in the end, to actually be effective, they all seem to boil down to 'We had to destroy the internet, in order to save it'.
>
> I think there are small technical changes around the edges that can help, but I really see the solutions for the metadata problem as more political and social than technical. Concentrating on making encryption really, really easy to use would go a lot further at this time than messing with deep changes, because people are not even using what is already available.


From eburger@standardstrack.com  Mon Oct 28 14:51:34 2013
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From: Douglas Otis <doug.mtview@gmail.com>
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Date: Mon, 28 Oct 2013 16:11:28 -0700
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References: <526811D1.3000802@rolamasao.org> <52681300.7020701@dcrocker.net> <526816B6.4080301@rolamasao.org> <526818F6.9000006@dcrocker.net> <7B180BF5-47CB-4821-82DA-773A1C38D548@gmail.com> <20131023200227.GB94140@funkthat.com> <63250A53-FE97-4530-B75D-60A1192D7C5D@gmail.com> <52683DDF.9030407@rolamasao.org> <20131023213555.GE94140@funkthat.com> <526841F3.4040505@rolamasao.org> <47EC7968-F4DD-42D9-BEAA-9435A010CECB@emc.com> <52696123.9000209@rolamasao.org> <alpine.LFD.2.10.1310251405160.17704@bofh.nohats.ca> <526B8A36.2090707@appelbaum.net> <CAMm+LwiA+eaZ4xRQ8Rn0gDBqgOeiHWAtUH0jqVob4G-db4nGhg@mail.gmail.com> <alpine.LFD.2.10.1310261436140.13053@bofh.nohats.ca> <CAMm+Lwg1taJcOaPtT_VQT924LF0EnCW=Fy3gaXo8YwVqEF+zog@mail.gmail.com>
To: Phillip Hallam-Baker <hallam@gmail.com>
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Cc: perpass <perpass@ietf.org>, Paul Wouters <paul@cypherpunks.ca>, Jacob Appelbaum <jacob@appelbaum.net>
Subject: Re: [perpass] OpenPGP Server-side Signed E-mail [Was: e-mail security idea: server2server PGP]
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On Oct 26, 2013, at 1:32 PM, Phillip Hallam-Baker <hallam@gmail.com> =
wrote:

> I don't see much point in trying to couple DANE to PGP.
>=20
> I don't care about sending mail to  cypherpunks.ca, I care about =
sending it to Paul Wouters.
>=20
> Except in very rare instances where an individual controls the domain =
or if I am sending to an enterprise, the domain is going to be pretty =
much irrelevant to authenticating the key.=20
>=20
> Locking down the mailserver key with DANE makes prefect sense. In fact =
that is the only reason I can see to do DNSSEC right now.=20

Dear Phillip,

Agreed.  Allow me to expand.  Who is communicating with whom should be =
considered private, but knowing which domain is sending data does not =
cause the same level of exposure when contained entities can be =
associated with different domains.  While the actual entity sending a =
message might be encrypted, knowing the domain facilitating the exchange =
is the bare minimum needed to defend the services.  No service can be =
allowed to issue messages anonymously.  XMPP offers clues about how this =
is deployable at scale in DNS where dial-back techniques should be =
disabled:

_xmpp-client._tcp.example.com. 36000 IN SRV 0 3 5222 xmpp.example.com.
_xmpp-server._tcp.example.com. 36000 IN SRV 0 3 5269 xmpp.example.com.

Unfortunately, major providers fail to ensure use of valid certificates =
and may only offer self-signed certificates where explicit exceptions =
need to be quietly made. Could this explain why a widely used IM client =
popular in Europe is likely obtained using HTTP?

Things like DANE offer hope.  Being unable to trust DNS or routing, it =
seems DANE offers a conceivable solution. I also agree with Albert Lunde =
about not embedding Turning-complete interpreters.  It is amazing this =
is not seen as harmful from a security perspective.  Perhaps the IETF =
could offer buttons and stickers for sale along with DNSSEC and DANE, or =
would that upset those not wanting to see anything change?  :^)

Regards,
Douglas Otis

There was of course no way of knowing whether you were being watched at =
any given moment. How often, or on what system, the Thought Police =
plugged in on any individual wire was guesswork. It was even conceivable =
that they watched everybody all the time. But at any rate they could =
plug in your wire whenever they wanted to. You had to live-did live, =
from habit that became instinct-in the assumption that every sound you =
made was overheard, and, except in darkness, every movement scrutinized.

Excerpt from Chapter One of George Orwell's book _Nineteen_Eighty_Four_=20=


--Apple-Mail=_3FFFD56E-9021-479C-A141-962547D96610
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=iso-8859-1

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Diso-8859-1"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
"><br><div><div>On Oct 26, 2013, at 1:32 PM, Phillip Hallam-Baker &lt;<a =
href=3D"mailto:hallam@gmail.com">hallam@gmail.com</a>&gt; =
wrote:</div><br><blockquote type=3D"cite"><div dir=3D"ltr"><div =
class=3D"gmail_extra"><div class=3D"gmail_quote"><div>I don't see much =
point in trying to couple DANE to PGP.</div><div><br></div><div>I don't =
care about sending mail to &nbsp;<a href=3D"mailto:paul@cypherpunks.ca" =
target=3D"_blank">cypherpunks.ca</a>, I care about sending it to Paul =
Wouters.</div>
<div><br></div><div>Except in very rare instances where an individual =
controls the domain or if I am sending to an enterprise, the domain is =
going to be pretty much irrelevant to authenticating the =
key.&nbsp;</div><div><br></div></div><div>Locking down the mailserver =
key with DANE makes prefect sense. In fact that is the only reason I can =
see to do DNSSEC right =
now.&nbsp;</div></div></div></blockquote></div><br><div>Dear =
Phillip,</div><div><br></div><div>Agreed. &nbsp;Allow me to expand. =
&nbsp;Who is communicating with whom should be considered private, but =
knowing which domain is sending data does not cause the same level of =
exposure when contained entities can be associated with different =
domains. &nbsp;While the actual entity sending a message might be =
encrypted, knowing the domain facilitating the exchange is the bare =
minimum needed to defend the services. &nbsp;No service can be allowed =
to issue messages anonymously. &nbsp;XMPP offers clues about how this is =
deployable at scale in DNS where dial-back techniques should be =
disabled:</div><div><br></div><div>_xmpp-client._tcp.<a =
href=3D"http://example.com">example.com</a>.&nbsp;36000&nbsp;IN =
SRV&nbsp;0&nbsp;3&nbsp;5222&nbsp;xmpp.example.com.<br>_xmpp-server._tcp.ex=
ample.com.&nbsp;36000&nbsp;IN =
SRV&nbsp;0&nbsp;3&nbsp;5269&nbsp;xmpp.example.com.</div><div><br></div><di=
v>Unfortunately, major providers fail to ensure use of valid =
certificates and may only offer self-signed certificates where explicit =
exceptions need to be quietly made. Could this explain why a widely used =
IM client popular in Europe is likely obtained using =
HTTP?</div><div><br></div><div>Things like DANE offer hope. &nbsp;Being =
unable to trust DNS or routing, it seems DANE offers a conceivable =
solution. I also agree with&nbsp;Albert Lunde about not =
embedding&nbsp;Turning-complete interpreters. &nbsp;It is amazing this =
is not seen as harmful from a security perspective. &nbsp;Perhaps the =
IETF could offer buttons and stickers for sale along with DNSSEC and =
DANE, or would that upset those not wanting to see anything change? =
&nbsp;:^)</div><div><br></div><div><div =
apple-content-edited=3D"true">Regards,<br>Douglas Otis<br><br></div><div =
apple-content-edited=3D"true"><div style=3D"margin: 0px; "><i>There was =
of course no way of knowing whether you were being watched at any given =
moment. How often, or on what system, the Thought Police plugged in on =
any individual wire was guesswork. It was even conceivable that they =
watched everybody all the time. But at any rate they could plug in your =
wire whenever they wanted to. You had to live-did live, from habit that =
became instinct-in the assumption that every sound you made was =
overheard, and, except in darkness, every movement =
scrutinized.</i></div><div apple-content-edited=3D"true"><br></div>Excerpt=
 from Chapter One of George Orwell's book =
_Nineteen_Eighty_Four_&nbsp;<br></div></div></body></html>=

--Apple-Mail=_3FFFD56E-9021-479C-A141-962547D96610--

From hallam@gmail.com  Mon Oct 28 19:43:50 2013
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From: Phillip Hallam-Baker <hallam@gmail.com>
To: perpass <perpass@ietf.org>
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Subject: [perpass] Metrics and Work Factor
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--089e0160b8284806d604e9d82fbe
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I am at a workshop on Cyber Metrics at MIT.

When we are talking about protection against targeted surveillance then we
look for the cost of a single attack to be prohibitive and we accept a
certain set of costs to the user.

But for stopping pervasive surveillance we can't always bear those costs.
Significantly increasing the per message work factor is still a benefit
even if the work factor is not prohibitive for single messages.

-- 
Website: http://hallambaker.com/

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<div dir=3D"ltr">I am at a workshop on Cyber Metrics at MIT.<div><br></div>=
<div>When we are talking about protection against targeted surveillance the=
n we look for the cost of a single attack to be prohibitive and we accept a=
 certain set of costs to the user.</div>
<div><br></div><div>But for stopping pervasive surveillance we can&#39;t al=
ways bear those costs. Significantly increasing the per message work factor=
 is still a benefit even if the work factor is not prohibitive for single m=
essages.=A0<br clear=3D"all">
<div><br></div>-- <br>Website: <a href=3D"http://hallambaker.com/">http://h=
allambaker.com/</a><br>
</div></div>

--089e0160b8284806d604e9d82fbe--

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References: <13102810494583_8A24@oregon.uoregon.edu>	<526EB50D.70008@cs.tcd.ie> <526ECC25.3060106@comcast.net> <526ED0B2.1050006@cs.tcd.ie>
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Subject: Re: [perpass] Traffic analysis
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I just placed a new copy of my draft on line as:

http://huitema.net/papers/draft-huitema-perpass-trafficanalysis-00.txt

The name changes following feedback, and to avoid unnecessary =
distractions. Thanks to Linus Nordberg for check proofing the previous =
version. I tried to add a couple of paragraphs to reflect the comments =
received on this list and in private, e.g., discussion of IPv6 =
addresses, or discussion of input-output correlation attacks against VPN =
servers or web proxies.

I did not add a complete discussion of e-mail monitoring. I am concerned =
that such addition would greatly increase the size of a draft centered =
on IP headers. E-mail monitoring may well deserve its own draft...

- -- Christian Huitema
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From ynir@checkpoint.com  Mon Oct 28 23:43:05 2013
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From: Yoav Nir <ynir@checkpoint.com>
To: Phillip Hallam-Baker <hallam@gmail.com>
Thread-Topic: [perpass] Metrics and Work Factor
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Date: Tue, 29 Oct 2013 06:42:49 +0000
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] Metrics and Work Factor
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On Oct 29, 2013, at 4:43 AM, Phillip Hallam-Baker <hallam@gmail.com>
 wrote:

> I am at a workshop on Cyber Metrics at MIT.
>=20
> When we are talking about protection against targeted surveillance then w=
e look for the cost of a single attack to be prohibitive and we accept a ce=
rtain set of costs to the user.
>=20
> But for stopping pervasive surveillance we can't always bear those costs.=
 Significantly increasing the per message work factor is still a benefit ev=
en if the work factor is not prohibitive for single messages.=20

Absolutely. If we can get the cost of surveillance to be such that the NSA =
can only afford to spy on 10,000 people, it's likely that most of us will n=
ot be under surveillance. I believe that I don't rank anywhere on the list =
of 10,000 most dangerous terrorists or criminals. That doesn't necessarily =
have to be measured in bits. If reading my email required breaking into my =
home and stealing the private key off of my computer, that would severely l=
imit the scale.

If we can ever get there, we've made significant progress in terms of priva=
cy. That would still leave the issue of activists and whistleblowers treate=
d as terrorists (or more correctly, wasting tax-payer money to fight politi=
cal opponents), but it would still be progress

Yoav



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From: Bjoern Hoehrmann <derhoermi@gmx.net>
To: Vidya Narayanan <vn@google.com>
Date: Tue, 29 Oct 2013 14:51:58 +0100
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Cc: perpass@ietf.org
Subject: Re: [perpass] Explicit proxying in HTTP
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* Vidya Narayanan wrote:
>All,
>http://tools.ietf.org/id/draft-vidya-httpbis-explicit-proxy-ps-00.txt is a
>problem statement on the need for explicit proxying in HTTP.

I have a suggestion. From the document:

   The use of proxies leads to a number of privacy issues.  To
   summarize:

   ...

   o  The server has no knowledge of the presence of the proxy and
      hence, cannot refuse to serve sensitive content over a proxied
      connection.

   o  The weakened security model, when certificate pinning is disabled
      at a general level, allows inspection of content ...

   ...

   With privacy becoming more and more important, it is important for us
   to support solutions that allow awareness of a privacy breach to both
   users and the servers, when that happens.  To this effect, it is
   important that proxies be explicitly supported and detected.

   ...

   o  Content providers may not wish to serve certain content in
      anything less than an end-to-end secure fashion.

How about including in the Goals section that users must be able to
verify the behavior of untrusted user agents without interference on
part of the server, which requires the user being able to inspect any
content without the server knowing, possibly by use of a proxy?

I also note that allowing servers to be aware when my "privacy" has
been "breached" in all likelyhood makes that breach worse, not better.
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

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Subject: [perpass] Perpassturbating metrics
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This is a multi-part message in MIME format.
--------------070405000907050904010408
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The metrics below are useful in
analyzing the dynamics of the group.
It certainly gets a gold star for diversity.

For those considering ID definitions,
the one below is available for use.

perpassturbating: usually, a paranoid
person stroking their keyboard to send
message on perpass email list beating
up on NSA and offering some mitigating
scheme in an attempt to prevent traffic
analysis.

-t


	
	Posts
Stephen 	Farrell 	106
Phillip 	Hallam-Baker 	53
Stephen 	Kent 	40
Karl 	Malbrain 	36
Hannes 	Tschofenig 	27
Randy 	Bush 	20
Brian 	Trammell 	18
Paul 	Wouters 	17
Scott 	Brim 	16
Ben 	Laurie 	16
Yoav 	Nir 	16
Tony 	Rutkowski 	16
Dave 	Crocker 	15

	SM 	14
Mike 	Demmers 	13
ned 	perpass 	13
Bjoern 	Hoehrmann 	12
Dean 	Willis 	12

	DataPacRat 	11
Kathleen 	Moriarty 	11
Jim 	Fenton 	9
Christian 	Huitema 	9
Hosnieh 	Rafiee 	9
Mark 	Handley 	8
Leif 	Johansson 	8
Douglas 	Otis 	8
Patrick 	Pelletier 	8
Peter 	Saint-Andre 	8
Richard 	Shockey 	8
Richard 	Barnes 	7
John-Mark 	Gurney 	7
joel 	jaeggli 	7
Brian 	Carpenter 	6
Ted 	Hardie 	6
Eliot 	Lear 	6
Yakov 	Shafranovich 	6
Yaron 	Sheffer 	6
Noel 	Torres 	6
Nicholas 	Weaver 	6
Jon 	Peterson 	5
Warren 	Kumari 	5
bill 	manning 	5
Russ 	White 	5
Jacob 	Appelbaum 	4
Stephane 	Bortzmeyer 	4
Alissa 	Cooper 	4
Joseph 	Hall 	4
Russ 	Housley 	4
Cullen 	Jennings 	4
Ralf Skyper 	Kaiser 	4
Nick 	Mathewson 	4
Nick 	Thomas 	4
Carl 	Wallace 	4
Benoit 	Claise 	3
Avri 	Doria 	3
Peter 	Gutmann 	3
Cullen 	Jennings 	3
Lucy 	Lynch 	3
Brian 	Rosen 	3
Theodore 	Ts'o 	3
Leo 	Vegoda 	3
Moritz 	Bartl 	2
Norbert 	Bollow 	2
Tim 	Bray 	2
Jon 	Callas 	2
James 	Cloos 	2
Elwyn 	Davies 	2
Karl 	Dubost 	2
Paul 	Hoffman 	2
Olle E. 	Johansson 	2
Simon 	Josefsson 	2
Paul 	Kyzivat 	2
Watson 	Ladd 	2
Albert 	Lunde 	2
Nicolas 	Mailhot 	2
George 	Michaelson 	2
d 	nix 	2
Linus 	Nordberg 	2
Marc 	Petit-Huguenin 	2
Martin 	Rex 	2
Joe 	St Sauver 	2
Eitan 	Adler 	1
Jari 	Arkko 	1
Mark 	Atwood 	1
Paul 	Bakker 	1
Marc 	Blanchet 	1
Dickson, 	Brian 	1
Richard Guy 	Briggs 	1
Eric 	Burger 	1
Adam 	Caudill 	1
William 	Chan 	1
Spencer 	Dawkins 	1
Nick 	Doty 	1
Roy 	Fielding 	1
Oliver 	Gasser 	1
Tobias 	Gondrom 	1
Harry 	Halpin 	1
Ryan 	Hurst 	1
Benjamin 	Kaduk 	1
Poul-Henning 	Kamp 	1
Hadriel 	Kaplan 	1
Phil 	Karn 	1
Adam 	Langley 	1
Eggert, 	Lars 	1
David 	Lloyd-Jones 	1
karl 	m 	1
Nikos 	Mavrogiannopoulos 	1
Alexey 	Melnikov 	1
David 	Morris 	1
Vidya 	Narayanan 	1
Trevor 	Perrin 	1
Alfredo 	Pironti 	1
Marsh 	Ray 	1
Eric 	Rescorla 	1
Michael 	Richardson 	1
Dan 	Schlitt 	1
Ross 	Schulman 	1
IETF 	Secretariat 	1
David 	Singer 	1
Ross 	Snider 	1
Elijah 	Sparrow 	1
Rene 	Struik 	1
Eduardo A. 	SuÃrez 	1
Andrew 	Sullivan 	1
Martin 	Thomson 	1
Mark 	Townsley 	1
Andy 	Wilson 	1
Robin 	Wilton 	1
Dan 	Wing 	1
Xiaoyong 	Wu 	1
Dan 	York 	1



--------------070405000907050904010408
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    The metrics below are useful in<br>
    analyzing the dynamics of the group.<br>
    It certainly gets a gold star for diversity.<br>
    <br>
    For those considering ID definitions,<br>
    the one below is available for use.<br>
    <p class="MsoNormal"><tt><span>perpassturbating: usually, a paranoid
          <br>
          person stroking </span></tt><span><tt>their keyboard to send
          <br>
          message on </tt><tt>perpass email list beating <br>
          up on NSA </tt><tt>and offering some mitigating <br>
          scheme in an </tt><tt>attempt to prevent traffic<br>
          analysis.<br>
        </tt></span></p>
    <p class="MsoNormal"><span><tt>-t<br>
          <br>
        </tt></span></p>
    <p class="MsoNormal"> </p>
    <table style="border-collapse: collapse;width:178pt" cellpadding="0"
      cellspacing="0" border="0" width="237">
      <colgroup><col style="width:48pt" width="64"> <col
          style="mso-width-source:userset;mso-width-alt:3986;width:82pt"
          width="109"> <col style="width:48pt" width="64"> </colgroup><tbody>
        <tr style="height:15.0pt" height="20">
          <td class="xl64" style="height:15.0pt;width:48pt" height="20"
            width="64"><br>
          </td>
          <td class="xl64" style="width:82pt" width="109"><br>
          </td>
          <td class="xl64" style="width:48pt" width="64">Posts</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Stephen</td>
          <td class="xl63">Farrell</td>
          <td class="xl63" align="right">106</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Phillip</td>
          <td class="xl63">Hallam-Baker</td>
          <td class="xl63" align="right">53</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Stephen</td>
          <td class="xl63">Kent</td>
          <td class="xl63" align="right">40</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Karl</td>
          <td class="xl63">Malbrain</td>
          <td class="xl63" align="right">36</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Hannes</td>
          <td class="xl63">Tschofenig</td>
          <td class="xl63" align="right">27</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Randy</td>
          <td class="xl63">Bush</td>
          <td class="xl63" align="right">20</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Brian</td>
          <td class="xl63">Trammell</td>
          <td class="xl63" align="right">18</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Paul</td>
          <td class="xl63">Wouters</td>
          <td class="xl63" align="right">17</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Scott</td>
          <td class="xl63">Brim</td>
          <td class="xl63" align="right">16</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Ben</td>
          <td class="xl63">Laurie</td>
          <td class="xl63" align="right">16</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Yoav</td>
          <td class="xl63">Nir</td>
          <td class="xl63" align="right">16</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Tony</td>
          <td class="xl63">Rutkowski</td>
          <td class="xl63" align="right">16</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Dave</td>
          <td class="xl63">Crocker</td>
          <td class="xl63" align="right">15</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20"><br>
          </td>
          <td class="xl63">SM</td>
          <td class="xl63" align="right">14</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Mike</td>
          <td class="xl63">Demmers</td>
          <td class="xl63" align="right">13</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">ned</td>
          <td class="xl63">perpass</td>
          <td class="xl63" align="right">13</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Bjoern</td>
          <td class="xl63">Hoehrmann</td>
          <td class="xl63" align="right">12</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Dean</td>
          <td class="xl63">Willis</td>
          <td class="xl63" align="right">12</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20"><br>
          </td>
          <td class="xl63">DataPacRat</td>
          <td class="xl63" align="right">11</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Kathleen</td>
          <td class="xl63">Moriarty</td>
          <td class="xl63" align="right">11</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Jim</td>
          <td class="xl63">Fenton</td>
          <td class="xl63" align="right">9</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Christian</td>
          <td class="xl63">Huitema</td>
          <td class="xl63" align="right">9</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Hosnieh</td>
          <td class="xl63">Rafiee</td>
          <td class="xl63" align="right">9</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Mark</td>
          <td class="xl63">Handley</td>
          <td class="xl63" align="right">8</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Leif</td>
          <td class="xl63">Johansson</td>
          <td class="xl63" align="right">8</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Douglas</td>
          <td class="xl63">Otis</td>
          <td class="xl63" align="right">8</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Patrick</td>
          <td class="xl63">Pelletier</td>
          <td class="xl63" align="right">8</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Peter</td>
          <td class="xl63">Saint-Andre</td>
          <td class="xl63" align="right">8</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Richard</td>
          <td class="xl63">Shockey</td>
          <td class="xl63" align="right">8</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Richard</td>
          <td class="xl63">Barnes</td>
          <td class="xl63" align="right">7</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">John-Mark</td>
          <td class="xl63">Gurney</td>
          <td class="xl63" align="right">7</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">joel</td>
          <td class="xl63">jaeggli</td>
          <td class="xl63" align="right">7</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Brian</td>
          <td class="xl63">Carpenter</td>
          <td class="xl63" align="right">6</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Ted</td>
          <td class="xl63">Hardie</td>
          <td class="xl63" align="right">6</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Eliot</td>
          <td class="xl63">Lear</td>
          <td class="xl63" align="right">6</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Yakov</td>
          <td class="xl63">Shafranovich</td>
          <td class="xl63" align="right">6</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Yaron</td>
          <td class="xl63">Sheffer</td>
          <td class="xl63" align="right">6</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Noel</td>
          <td class="xl63">Torres</td>
          <td class="xl63" align="right">6</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Nicholas</td>
          <td class="xl63">Weaver</td>
          <td class="xl63" align="right">6</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Jon</td>
          <td class="xl63">Peterson</td>
          <td class="xl63" align="right">5</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Warren</td>
          <td class="xl63">Kumari</td>
          <td class="xl63" align="right">5</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">bill</td>
          <td class="xl63">manning</td>
          <td class="xl63" align="right">5</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Russ</td>
          <td class="xl63">White</td>
          <td class="xl63" align="right">5</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Jacob</td>
          <td class="xl63">Appelbaum</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Stephane</td>
          <td class="xl63">Bortzmeyer</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Alissa</td>
          <td class="xl63">Cooper</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Joseph</td>
          <td class="xl63">Hall</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Russ</td>
          <td class="xl63">Housley</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Cullen</td>
          <td class="xl63">Jennings</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Ralf Skyper</td>
          <td class="xl63">Kaiser</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Nick</td>
          <td class="xl63">Mathewson</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Nick</td>
          <td class="xl63">Thomas</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Carl</td>
          <td class="xl63">Wallace</td>
          <td class="xl63" align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Benoit</td>
          <td class="xl63">Claise</td>
          <td class="xl63" align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Avri</td>
          <td class="xl63">Doria</td>
          <td class="xl63" align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Peter</td>
          <td class="xl63">Gutmann</td>
          <td class="xl63" align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Cullen</td>
          <td class="xl63">Jennings</td>
          <td class="xl63" align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Lucy</td>
          <td class="xl63">Lynch</td>
          <td class="xl63" align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Brian</td>
          <td class="xl63">Rosen</td>
          <td class="xl63" align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Theodore</td>
          <td class="xl63">Ts'o</td>
          <td class="xl63" align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Leo</td>
          <td class="xl63">Vegoda</td>
          <td class="xl63" align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Moritz</td>
          <td class="xl63">Bartl</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Norbert</td>
          <td class="xl63">Bollow</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Tim</td>
          <td class="xl63">Bray</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Jon</td>
          <td class="xl63">Callas</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">James</td>
          <td class="xl63">Cloos</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Elwyn</td>
          <td class="xl63">Davies</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Karl</td>
          <td class="xl63">Dubost</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Paul</td>
          <td class="xl63">Hoffman</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Olle E.</td>
          <td class="xl63">Johansson</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Simon</td>
          <td class="xl63">Josefsson</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Paul</td>
          <td class="xl63">Kyzivat</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Watson</td>
          <td class="xl63">Ladd</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Albert</td>
          <td class="xl63">Lunde</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Nicolas</td>
          <td class="xl63">Mailhot</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">George</td>
          <td class="xl63">Michaelson</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">d</td>
          <td class="xl63">nix</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Linus</td>
          <td class="xl63">Nordberg</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Marc</td>
          <td class="xl63">Petit-Huguenin</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Martin</td>
          <td class="xl63">Rex</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Joe</td>
          <td class="xl63">St Sauver</td>
          <td class="xl63" align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Eitan</td>
          <td class="xl63">Adler</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Jari</td>
          <td class="xl63">Arkko</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Mark</td>
          <td class="xl63">Atwood</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Paul</td>
          <td class="xl63">Bakker</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Marc</td>
          <td class="xl63">Blanchet</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Dickson,</td>
          <td class="xl63">Brian</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Richard Guy</td>
          <td class="xl63">Briggs</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Eric</td>
          <td class="xl63">Burger</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Adam</td>
          <td class="xl63">Caudill</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">William</td>
          <td class="xl63">Chan</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Spencer</td>
          <td class="xl63">Dawkins</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Nick</td>
          <td class="xl63">Doty</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Roy</td>
          <td class="xl63">Fielding</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Oliver</td>
          <td class="xl63">Gasser</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Tobias</td>
          <td class="xl63">Gondrom</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Harry</td>
          <td class="xl63">Halpin</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Ryan</td>
          <td class="xl63">Hurst</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Benjamin</td>
          <td class="xl63">Kaduk</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Poul-Henning</td>
          <td class="xl63">Kamp</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Hadriel</td>
          <td class="xl63">Kaplan</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Phil</td>
          <td class="xl63">Karn</td>
          <td class="xl63" align="right">1</td>
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        </tr>
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          <td class="xl63" style="height:15.0pt" height="20">David</td>
          <td class="xl63">Singer</td>
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        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Ross</td>
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        </tr>
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          <td class="xl63" style="height:15.0pt" height="20">Elijah</td>
          <td class="xl63">Sparrow</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Rene</td>
          <td class="xl63">Struik</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Eduardo A.</td>
          <td class="xl63">Su&Atilde;rez</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Andrew</td>
          <td class="xl63">Sullivan</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Martin</td>
          <td class="xl63">Thomson</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Mark</td>
          <td class="xl63">Townsley</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Andy</td>
          <td class="xl63">Wilson</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Robin</td>
          <td class="xl63">Wilton</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Dan</td>
          <td class="xl63">Wing</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Xiaoyong</td>
          <td class="xl63">Wu</td>
          <td class="xl63" align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td class="xl63" style="height:15.0pt" height="20">Dan</td>
          <td class="xl63">York</td>
          <td class="xl63" align="right">1</td>
        </tr>
      </tbody>
    </table>
    <br>
  </body>
</html>

--------------070405000907050904010408--

From dhc@dcrocker.net  Tue Oct 29 07:35:30 2013
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Subject: Re: [perpass] Perpassturbating metrics
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On 10/29/2013 7:13 AM, Tony Rutkowski wrote:
> perpassturbating: usually, a paranoid
> person stroking their keyboard to send
> message on perpass email list beating
> up on NSA and offering some mitigating
> scheme in an attempt to prevent traffic
> analysis.


Gosh, Tony, that's so clever.

However I can't understand how I fit into the count, since I've tried to 
be careful to say nothing against NSA, explicitly or implicitly, since I 
consider it out of scope for this list.  And I think that's true of 
number of others you cite.

I thought the purpose of this list was technical discussion, not 
discussion of government agencies, per se.

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

From stephen.farrell@cs.tcd.ie  Tue Oct 29 08:12:18 2013
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Subject: [perpass] Various IETF-88 sessions discussing pervasive monitoring
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Hiya,

Aside from the tech plenary and the BoF slot, a few other
sessions will discuss relevant topics. I'm keeping a list
here. [1]

And for anyone coming late to the list, I've also got a
list of what I think are relevant drafts and threads. [2]
Note that that latter list doesn't imply any status for
any draft, its just I found it useful to keep track of
the more useful material. (I guess it might also help
folks skip over the sillier noise on the list;-)

Additions/corrections to either are welcome, just send
me a mail offlist.

Cheers,
S.

[1] http://down.dsg.cs.tcd.ie/misc/perpass-sessions.txt
[2] http://down.dsg.cs.tcd.ie/misc/perpass.txt

From rutkowski.tony@gmail.com  Tue Oct 29 08:13:12 2013
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Hi Dave,

Good point.  Hence the word "generally."  I obviously
don't fit that definition either...nor frankly do most others,
as the discussion has largely been focussed on technical
matters.  The definition was intended to apply to those on
the list who seem to get pleasure from the government if
not private sector surveillance bashing and are motivated
by it.  So apologies for the over reaching comedic definition.

The metrics are, however, themselves interesting, and
indicative of who shapes the discussions, who are
especially motivated. and the  surprisingly large number
of people participating.  With 131 people posting, the
views are diverse, and among those participating above
the norm, the platforms are interesting albeit mostly
well tread and unlikely to be pursued except in small
communities of users that have the motivation and
money to pursue them.

best,
--tony


On 10/29/2013 10:34 AM, Dave Crocker wrote:
> I thought the purpose of this list was technical discussion, not 
> discussion of government agencies, per se.


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Subject: Re: [perpass] Perpassturbating metrics
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On 10/29/2013 8:13 AM, Tony Rutkowski wrote:
> Hi Dave,
>
> Good point.  Hence the word "generally."  I obviously


Tony,

The word you used was 'usually'.  Either way it's wrong.  Your asserting 
paranoia as the basis for the comments is entirely inappropriate here, 
both for scope and justification.

And the topic of the NSA has not dominated the list, which makes 
'generally' or 'usually' statistically wrong, also.

As for 'shaping' the discussion, your simplistic model implies that a 
single, cogent posting doesn't affect the shape as much as raw number of 
postings, or that we haven't had such postings.  It doesn't take a human 
communications masters degree to know that that's wrong, too.  While 
knowing posting rate can be informative, it's not nearly as substantive 
as you've just asserted.

So as comedic attempts go, you should try to develop better material, 
but my personal request is that you please not here.  Invoking NSA here 
is mostly likely (or will 'usually') create distractions.

Surely that's not your intent?[*]

d/

[*]  That's what is called a rhetorical question.

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

From acooper@cdt.org  Tue Oct 29 08:28:48 2013
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From: Alissa Cooper <acooper@cdt.org>
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I find this offensive and juvenile. Let's stick to the topics that this =
mailing list was designed for.

Alissa

On Oct 29, 2013, at 7:13 AM, Tony Rutkowski <rutkowski.tony@gmail.com> =
wrote:

> The metrics below are useful in
> analyzing the dynamics of the group.
> It certainly gets a gold star for diversity.
>=20
> For those considering ID definitions,
> the one below is available for use.
> perpassturbating: usually, a paranoid=20
> person stroking their keyboard to send=20
> message on perpass email list beating=20
> up on NSA and offering some mitigating=20
> scheme in an attempt to prevent traffic
> analysis.
>=20
> -t
>=20
>=20
>=20
>=20
>=20
> Posts
> Stephen	Farrell	106
> Phillip	Hallam-Baker	53
> Stephen	Kent	40
> Karl	Malbrain	36
> Hannes	Tschofenig	27
> Randy	Bush	20
> Brian	Trammell	18
> Paul	Wouters	17
> Scott	Brim	16
> Ben	Laurie	16
> Yoav	Nir	16
> Tony	Rutkowski	16
> Dave	Crocker	15
>=20
> SM	14
> Mike	Demmers	13
> ned	perpass	13
> Bjoern	Hoehrmann	12
> Dean	Willis	12
>=20
> DataPacRat	11
> Kathleen	Moriarty	11
> Jim	Fenton	9
> Christian	Huitema	9
> Hosnieh	Rafiee	9
> Mark	Handley	8
> Leif	Johansson	8
> Douglas	Otis	8
> Patrick	Pelletier	8
> Peter	Saint-Andre	8
> Richard	Shockey	8
> Richard	Barnes	7
> John-Mark	Gurney	7
> joel	jaeggli	7
> Brian	Carpenter	6
> Ted	Hardie	6
> Eliot	Lear	6
> Yakov	Shafranovich	6
> Yaron	Sheffer	6
> Noel	Torres	6
> Nicholas	Weaver	6
> Jon	Peterson	5
> Warren	Kumari	5
> bill	manning	5
> Russ	White	5
> Jacob	Appelbaum	4
> Stephane	Bortzmeyer	4
> Alissa	Cooper	4
> Joseph	Hall	4
> Russ	Housley	4
> Cullen	Jennings	4
> Ralf Skyper	Kaiser	4
> Nick	Mathewson	4
> Nick	Thomas	4
> Carl	Wallace	4
> Benoit	Claise	3
> Avri	Doria	3
> Peter	Gutmann	3
> Cullen	Jennings	3
> Lucy	Lynch	3
> Brian	Rosen	3
> Theodore	Ts'o	3
> Leo	Vegoda	3
> Moritz	Bartl	2
> Norbert	Bollow	2
> Tim	Bray	2
> Jon	Callas	2
> James	Cloos	2
> Elwyn	Davies	2
> Karl	Dubost	2
> Paul	Hoffman	2
> Olle E.	Johansson	2
> Simon	Josefsson	2
> Paul	Kyzivat	2
> Watson	Ladd	2
> Albert	Lunde	2
> Nicolas	Mailhot	2
> George	Michaelson	2
> d	nix	2
> Linus	Nordberg	2
> Marc	Petit-Huguenin	2
> Martin	Rex	2
> Joe	St Sauver	2
> Eitan	Adler	1
> Jari	Arkko	1
> Mark	Atwood	1
> Paul	Bakker	1
> Marc	Blanchet	1
> Dickson,	Brian	1
> Richard Guy	Briggs	1
> Eric	Burger	1
> Adam	Caudill	1
> William	Chan	1
> Spencer	Dawkins	1
> Nick	Doty	1
> Roy	Fielding	1
> Oliver	Gasser	1
> Tobias	Gondrom	1
> Harry	Halpin	1
> Ryan	Hurst	1
> Benjamin	Kaduk	1
> Poul-Henning	Kamp	1
> Hadriel	Kaplan	1
> Phil	Karn	1
> Adam	Langley	1
> Eggert,	Lars	1
> David	Lloyd-Jones	1
> karl	m	1
> Nikos	Mavrogiannopoulos	1
> Alexey	Melnikov	1
> David	Morris	1
> Vidya	Narayanan	1
> Trevor	Perrin	1
> Alfredo	Pironti	1
> Marsh	Ray	1
> Eric	Rescorla	1
> Michael	Richardson	1
> Dan	Schlitt	1
> Ross	Schulman	1
> IETF	Secretariat	1
> David	Singer	1
> Ross	Snider	1
> Elijah	Sparrow	1
> Rene	Struik	1
> Eduardo A.	Su=C3rez	1
> Andrew	Sullivan	1
> Martin	Thomson	1
> Mark	Townsley	1
> Andy	Wilson	1
> Robin	Wilton	1
> Dan	Wing	1
> Xiaoyong	Wu	1
> Dan	York	1
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


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On 10/29/13 9:28 AM, Alissa Cooper wrote:
> I find this offensive and juvenile. Let's stick to the topics that
> this mailing list was designed for.

Yes, please!!!

Peter

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Not a big fan of +1s. But sometimes there's nothing else to be said.

+1,

Brian

Alissa Cooper wrote:
> I find this offensive and juvenile. Let's stick to the topics that this mailing list was designed for.
>
> Alissa
>
> On Oct 29, 2013, at 7:13 AM, Tony Rutkowski<rutkowski.tony@gmail.com>  wrote:
>
>> The metrics below are useful in
>> analyzing the dynamics of the group.
>> It certainly gets a gold star for diversity.
>>
>> For those considering ID definitions,
>> the one below is available for use.
>> perpassturbating: usually, a paranoid
>> person stroking their keyboard to send
>> message on perpass email list beating
>> up on NSA and offering some mitigating
>> scheme in an attempt to prevent traffic
>> analysis.
>>
>> -t
>>
>>
>>
>>
>>
>> Posts
>> Stephen	Farrell	106
>> Phillip	Hallam-Baker	53
>> Stephen	Kent	40
>> Karl	Malbrain	36
>> Hannes	Tschofenig	27
>> Randy	Bush	20
>> Brian	Trammell	18
>> Paul	Wouters	17
>> Scott	Brim	16
>> Ben	Laurie	16
>> Yoav	Nir	16
>> Tony	Rutkowski	16
>> Dave	Crocker	15
>>
>> SM	14
>> Mike	Demmers	13
>> ned	perpass	13
>> Bjoern	Hoehrmann	12
>> Dean	Willis	12
>>
>> DataPacRat	11
>> Kathleen	Moriarty	11
>> Jim	Fenton	9
>> Christian	Huitema	9
>> Hosnieh	Rafiee	9
>> Mark	Handley	8
>> Leif	Johansson	8
>> Douglas	Otis	8
>> Patrick	Pelletier	8
>> Peter	Saint-Andre	8
>> Richard	Shockey	8
>> Richard	Barnes	7
>> John-Mark	Gurney	7
>> joel	jaeggli	7
>> Brian	Carpenter	6
>> Ted	Hardie	6
>> Eliot	Lear	6
>> Yakov	Shafranovich	6
>> Yaron	Sheffer	6
>> Noel	Torres	6
>> Nicholas	Weaver	6
>> Jon	Peterson	5
>> Warren	Kumari	5
>> bill	manning	5
>> Russ	White	5
>> Jacob	Appelbaum	4
>> Stephane	Bortzmeyer	4
>> Alissa	Cooper	4
>> Joseph	Hall	4
>> Russ	Housley	4
>> Cullen	Jennings	4
>> Ralf Skyper	Kaiser	4
>> Nick	Mathewson	4
>> Nick	Thomas	4
>> Carl	Wallace	4
>> Benoit	Claise	3
>> Avri	Doria	3
>> Peter	Gutmann	3
>> Cullen	Jennings	3
>> Lucy	Lynch	3
>> Brian	Rosen	3
>> Theodore	Ts'o	3
>> Leo	Vegoda	3
>> Moritz	Bartl	2
>> Norbert	Bollow	2
>> Tim	Bray	2
>> Jon	Callas	2
>> James	Cloos	2
>> Elwyn	Davies	2
>> Karl	Dubost	2
>> Paul	Hoffman	2
>> Olle E.	Johansson	2
>> Simon	Josefsson	2
>> Paul	Kyzivat	2
>> Watson	Ladd	2
>> Albert	Lunde	2
>> Nicolas	Mailhot	2
>> George	Michaelson	2
>> d	nix	2
>> Linus	Nordberg	2
>> Marc	Petit-Huguenin	2
>> Martin	Rex	2
>> Joe	St Sauver	2
>> Eitan	Adler	1
>> Jari	Arkko	1
>> Mark	Atwood	1
>> Paul	Bakker	1
>> Marc	Blanchet	1
>> Dickson,	Brian	1
>> Richard Guy	Briggs	1
>> Eric	Burger	1
>> Adam	Caudill	1
>> William	Chan	1
>> Spencer	Dawkins	1
>> Nick	Doty	1
>> Roy	Fielding	1
>> Oliver	Gasser	1
>> Tobias	Gondrom	1
>> Harry	Halpin	1
>> Ryan	Hurst	1
>> Benjamin	Kaduk	1
>> Poul-Henning	Kamp	1
>> Hadriel	Kaplan	1
>> Phil	Karn	1
>> Adam	Langley	1
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From davieseb@scss.tcd.ie  Tue Oct 29 11:14:06 2013
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From: Elwyn Davies <davieseb@scss.tcd.ie>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [perpass] Various IETF-88 sessions discussing pervasive monitoring
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Attached is a handy archive of the various drafts plus the two files
[1,2] below.

/Elwyn

On Tue, 2013-10-29 at 15:11 +0000, Stephen Farrell wrote:
> Hiya,
> 
> Aside from the tech plenary and the BoF slot, a few other
> sessions will discuss relevant topics. I'm keeping a list
> here. [1]
> 
> And for anyone coming late to the list, I've also got a
> list of what I think are relevant drafts and threads. [2]
> Note that that latter list doesn't imply any status for
> any draft, its just I found it useful to keep track of
> the more useful material. (I guess it might also help
> folks skip over the sillier noise on the list;-)
> 
> Additions/corrections to either are welcome, just send
> me a mail offlist.
> 
> Cheers,
> S.
> 
> [1] http://down.dsg.cs.tcd.ie/misc/perpass-sessions.txt
> [2] http://down.dsg.cs.tcd.ie/misc/perpass.txt
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass

--=-R59e+cga56IpbuvkwhK+
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--=-R59e+cga56IpbuvkwhK+--


From richard@shockey.us  Tue Oct 29 14:44:30 2013
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From: "Richard Shockey" <richard@shockey.us>
To: <ned+perpass@mrochek.com>, "'Joe St Sauver'" <joe@oregon.uoregon.edu>
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Cc: perpass@ietf.org, huitema@huitema.net, stephen.farrell@cs.tcd.ie
Subject: Re: [perpass] Traffic analysis
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Ned makes a number of excellent points here and the real elephant in the
room is under what terms and conditions is the ongoing collection of
metadata about IP communications in any form actually needed and in fact
absolutely necessary. 

There are perfectly good reasons to collect this stuff.   Though the ongoing
concern of this list is clearly the Snowden revelations some of us actually
want that data to prevent and investigate real and legitimate fraud and
abuse within the communications systems, optimize network transport etc. 

First if you take a little stroll over to the IETF STIR problem statement
you will see that fraudulent voice communications is becoming a huge problem
for National Regulators and Law Enforcement.   In the US the failure of
Rural Calls to certain areas now requires the US carriers to maintain ever
larger CDR records in order to preserve the integrity of the PSTN itself.   

http://www.fcc.gov/document/fcc-acts-combat-call-completion-problems-rural-a
merica

Consumers are totally outraged by the violations of THEIR PRIVACY... the
right to be left alone... by malicious Robo Callers who ignore the various
Laws about Do Not Call lists etc.   E-Mail spam has not gone away by any
account but the need for logs and records to attempt to track criminal
activity is still required.  We want to hunt these people down and shut down
their operations.  

The issue is appropriate safeguards on those records and there is
essentially nothing the IETF can do about that.  

It is useful to talk about strengthening key length and understanding to
underlying archectural reasons no one really wants to deploy secure
communications. 

I totally agree with this statement. " I think there are small technical
changes around the edges that can help, but I really see the solutions for
the metadata problem as more political and social than technical.
Concentrating on making encryption really, really easy to use would go a lot
further at this time than messing with deep changes, because people are not
even using what is already available."

Though I would not have used Tony's precise language on a public mail.  I'm
afraid I agree with the underlying sentiment.   

There are more than one joke running around Washington DC about actually
wanting the NSA to keep the CDR records if they would actually use them to
stop robo calls and call spoofing.  



-----Original Message-----
From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf
Of ned+perpass@mrochek.com
Sent: Monday, October 28, 2013 2:30 PM
To: Joe St Sauver
Cc: perpass@ietf.org; huitema@huitema.net; stephen.farrell@cs.tcd.ie
Subject: Re: [perpass] Traffic analysis

> Hi,

> Stephen Farrell <stephen.farrell@cs.tcd.ie>:

> #Not quite sure, but I think we might get some benefit at the #moment 
> from considering how specific fields in real protocols #undermine 
> privacy (e.g. as Christian's draft does with the #Received header 
> fields in mail messages) even if/when TLS or #other existing security 
> mechanisms are properly used.

> My concern is that many traffic analytic approaches tend to be 
> exceedingly robust to "protocol improvements." Protocol tweaks may 
> accomplish little when it comes to practically improving privacy if 
> the underlying protocol's architecture and operational practice goes 
> unchanged.

> For example, when it comes to email, shouldn't section 6 of 
> http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt
> basically say, "if you want to avoid traffic analytic approaches in 
> the case of email, deploy and use Mixmaster anonymous remailers"?
> ( 
> https://en.wikipedia.org/wiki/Anonymous_remailers#Untraceable_remailer
> s )

And good luck with that, at least on any kind of scale.

But your underlying point is very well taken: The section on email in this
draft focuses on irrelevancies and fails to take note of the real issues.

I hate to sound like a broken record, but folks really need to have some
familiarity with present-day email as it is actually deployed before making
these sorts of asssessments.

Again, present day email usage is increasingly concentrated to a fairly
small number of large ISPs and MSPs. (Small ISPs and enterprise setups are
shifting to using cloud services, and while the Snowden revelations may have
slowed this trend, they haven't stopped it.)

In regards to traffic analysis, this is in some ways a good thing. If the
connections from user clients to the ISP/MSP servers are secured at the
transport layer - and I have demonstrated that a lot of them are - then we
gain a lot by securing the streams between the large providers at the
transport level.

But the elephant in the corner is logging. Service providers maintain very
extensive logs of email traffic, if for no other reason than as a support
tool. These logs provide every possible detail needed for traffic analysis.

Of course one of the earliest Snowden revelations was that the NSA is
collecting these logs from US providers on a massive scale. And hopefully
everyone is aware of Smith v. Maryland, which essentialls says that metadata
is not constitutionally protected.

But before Eupopeans and others get all smug about this, speaking as someone
who has seen quite a few RFPs for mail systems, the only substantive
difference I see between the US and elsewhere is the US approaches this in a
less organized and systematic way and generally has fewer auditing and data
protection requirements. The data is still being collected, and most likely
shareed.

And as for practical and deployable measures that can be undertaken to
address this, I'm at something of a loss to suggest anything. Shifting back
to a more decentralized model sounds nice, but seems a bit outside the
purview of a standards process to try and make that happen.

And even if it a completely decentralized model was practical, in a
peer-to-peer world the metadata that would accrue from watching the
connections themselves would be a fair substitute.

As for mixed models, look at what happened to Lavabit.

> And if we *are* talking about that sort of approach, then I think 
> inevitably we also need to talk about how we simultaneously manage to 
> allow *wanted* private traffic while simultaneously preventing or 
> managing *unwanted traffic* (e.g., spam).

Yep. It's a daunting problem. And it is far from the only one.

> An awful lot of current anti-spam technology depends upon either 
> reputation (which is obviously not present in the case of 
> anonymous/non-attributable traffic), or content analysis (which is 
> also obviously problematic, at least if we presume use of end-to-end 
> encryption (at least until the content is decrypted on the end-user's 
> device)).

You basically have to push the content checks to the client. This has not
proven to be a terrific solution in practice.

> I also think that if you're serious about email privacy, you really 
> can't keep the discussion just at the level of sanitizing headers. You 
> need to get into the format of the content that's allowed as well. For 
> example, it's well known that non-plain text email content (e.g., 
> HTML-formatted email) is potentially a serious threat to privacy due 
> to potential use of things like tracking gifs included in 
> HTML-formatted email.

I think we can do a lot to make it harder to snoop on email content,
although ironically what we're likely to be able to accomplish under the
"prism-proof"
rubric is unlikely to much of anything about the data collection the actual
Prism program performs.

But traffic analysis... unless the fact that those logs are likely to only
be accessible to state entities offers some consolation, I don't think
there's going to be much happiness here.

				Ned
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Hi Rich,

On 10/29/2013 09:43 PM, Richard Shockey wrote:
> 
> Ned makes a number of excellent points here and the real elephant in the
> room is under what terms and conditions is the ongoing collection of
> metadata about IP communications in any form actually needed and in fact
> absolutely necessary. 

To the extent I can parse that, it seems like blatant assertion.

> There are perfectly good reasons to collect this stuff.   Though the ongoing
> concern of this list is clearly the Snowden revelations some of us actually
> want that data to prevent and investigate real and legitimate fraud and
> abuse within the communications systems, optimize network transport etc. 

Countering fraud is a real requirement, agreed. I don't accept
that that implies a requirement that pervasive monitoring be
possible. But there are trade-offs and we do need to consider
those carefully.

Optimising transport seems bogus though - can you provide a
reference or argument as to why you'd need to pervasively monitor
in a privacy unfriendly way to do that?

> First if you take a little stroll over to the IETF STIR problem statement
> you will see that fraudulent voice communications is becoming a huge problem
> for National Regulators and Law Enforcement.   In the US the failure of
> Rural Calls to certain areas now requires the US carriers to maintain ever
> larger CDR records in order to preserve the integrity of the PSTN itself.   

I think STIR is a red herring here. Adding STIR doesn't really affect
pervasive monitoring since the overwhelming majority of calls already
use valid phone numbers so STIR doesn't really add to the ability to
pervasively monitor.

Now if we had a mechanism that added a useful signature whilst
disguising the caller identity, that might be interesting. Or one
that used a public key previously used to verify a signature to
encrypt call setup. And STIR does offer longer term possibilities
for both of those.

So I don't see STIR as being "for" or "against" pervasive monitoring.
Same as for any authentication mechanism.

But yes, there are privacy issues related to STIR that do need to
be considered.

> http://www.fcc.gov/document/fcc-acts-combat-call-completion-problems-rural-a
> merica
> 
> Consumers are totally outraged by the violations of THEIR PRIVACY... the
> right to be left alone... by malicious Robo Callers who ignore the various
> Laws about Do Not Call lists etc.   E-Mail spam has not gone away by any
> account but the need for logs and records to attempt to track criminal
> activity is still required.  We want to hunt these people down and shut down
> their operations.  

Yes, helping folks block robo-calls is a good. I don't think STIR
is meant to actually define how to hunt anyone down though:-)

I'm also not at all sure that logging all the ham is required to
help track spammers.

> The issue is appropriate safeguards on those records and there is
> essentially nothing the IETF can do about that.  
> 
> It is useful to talk about strengthening key length and understanding to
> underlying archectural reasons no one really wants to deploy secure
> communications. 
> 
> I totally agree with this statement. " I think there are small technical
> changes around the edges that can help, but I really see the solutions for
> the metadata problem as more political and social than technical.

There is a political angle sure. And that's not an IETF concern
since the politics seem to be very different in different places.
Basically, the same logic as is set out in RFC 2804 applies to
that I think.

However, I very much disagree that this is *only* political. If
whoever is your favorite authority can pervasively monitor everyone
then so can others that you don't like so much. And that's true for
all values of "authority", at least in principle and quite likely
in practice, at least at some scale. And if we can have such bad
actors, there's no reason why they need to be nation states at all.
Plain old criminals can play this game and will. I believe we do
have good technical reasons for wanting to counter pervasive
monitoring.

Having said all that, yes, I do agree that doing more than making
the crypto stuff easier/better is hard. Doesn't mean we shouldn't
try though, if we really want to do better on privacy.

Regards,
S.

> Concentrating on making encryption really, really easy to use would go a lot
> further at this time than messing with deep changes, because people are not
> even using what is already available."
> 
> Though I would not have used Tony's precise language on a public mail.  I'm
> afraid I agree with the underlying sentiment.   
> 
> There are more than one joke running around Washington DC about actually
> wanting the NSA to keep the CDR records if they would actually use them to
> stop robo calls and call spoofing.  
> 
> 
> 
> -----Original Message-----
> From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On Behalf
> Of ned+perpass@mrochek.com
> Sent: Monday, October 28, 2013 2:30 PM
> To: Joe St Sauver
> Cc: perpass@ietf.org; huitema@huitema.net; stephen.farrell@cs.tcd.ie
> Subject: Re: [perpass] Traffic analysis
> 
>> Hi,
> 
>> Stephen Farrell <stephen.farrell@cs.tcd.ie>:
> 
>> #Not quite sure, but I think we might get some benefit at the #moment 
>> from considering how specific fields in real protocols #undermine 
>> privacy (e.g. as Christian's draft does with the #Received header 
>> fields in mail messages) even if/when TLS or #other existing security 
>> mechanisms are properly used.
> 
>> My concern is that many traffic analytic approaches tend to be 
>> exceedingly robust to "protocol improvements." Protocol tweaks may 
>> accomplish little when it comes to practically improving privacy if 
>> the underlying protocol's architecture and operational practice goes 
>> unchanged.
> 
>> For example, when it comes to email, shouldn't section 6 of 
>> http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt
>> basically say, "if you want to avoid traffic analytic approaches in 
>> the case of email, deploy and use Mixmaster anonymous remailers"?
>> ( 
>> https://en.wikipedia.org/wiki/Anonymous_remailers#Untraceable_remailer
>> s )
> 
> And good luck with that, at least on any kind of scale.
> 
> But your underlying point is very well taken: The section on email in this
> draft focuses on irrelevancies and fails to take note of the real issues.
> 
> I hate to sound like a broken record, but folks really need to have some
> familiarity with present-day email as it is actually deployed before making
> these sorts of asssessments.
> 
> Again, present day email usage is increasingly concentrated to a fairly
> small number of large ISPs and MSPs. (Small ISPs and enterprise setups are
> shifting to using cloud services, and while the Snowden revelations may have
> slowed this trend, they haven't stopped it.)
> 
> In regards to traffic analysis, this is in some ways a good thing. If the
> connections from user clients to the ISP/MSP servers are secured at the
> transport layer - and I have demonstrated that a lot of them are - then we
> gain a lot by securing the streams between the large providers at the
> transport level.
> 
> But the elephant in the corner is logging. Service providers maintain very
> extensive logs of email traffic, if for no other reason than as a support
> tool. These logs provide every possible detail needed for traffic analysis.
> 
> Of course one of the earliest Snowden revelations was that the NSA is
> collecting these logs from US providers on a massive scale. And hopefully
> everyone is aware of Smith v. Maryland, which essentialls says that metadata
> is not constitutionally protected.
> 
> But before Eupopeans and others get all smug about this, speaking as someone
> who has seen quite a few RFPs for mail systems, the only substantive
> difference I see between the US and elsewhere is the US approaches this in a
> less organized and systematic way and generally has fewer auditing and data
> protection requirements. The data is still being collected, and most likely
> shareed.
> 
> And as for practical and deployable measures that can be undertaken to
> address this, I'm at something of a loss to suggest anything. Shifting back
> to a more decentralized model sounds nice, but seems a bit outside the
> purview of a standards process to try and make that happen.
> 
> And even if it a completely decentralized model was practical, in a
> peer-to-peer world the metadata that would accrue from watching the
> connections themselves would be a fair substitute.
> 
> As for mixed models, look at what happened to Lavabit.
> 
>> And if we *are* talking about that sort of approach, then I think 
>> inevitably we also need to talk about how we simultaneously manage to 
>> allow *wanted* private traffic while simultaneously preventing or 
>> managing *unwanted traffic* (e.g., spam).
> 
> Yep. It's a daunting problem. And it is far from the only one.
> 
>> An awful lot of current anti-spam technology depends upon either 
>> reputation (which is obviously not present in the case of 
>> anonymous/non-attributable traffic), or content analysis (which is 
>> also obviously problematic, at least if we presume use of end-to-end 
>> encryption (at least until the content is decrypted on the end-user's 
>> device)).
> 
> You basically have to push the content checks to the client. This has not
> proven to be a terrific solution in practice.
> 
>> I also think that if you're serious about email privacy, you really 
>> can't keep the discussion just at the level of sanitizing headers. You 
>> need to get into the format of the content that's allowed as well. For 
>> example, it's well known that non-plain text email content (e.g., 
>> HTML-formatted email) is potentially a serious threat to privacy due 
>> to potential use of things like tracking gifs included in 
>> HTML-formatted email.
> 
> I think we can do a lot to make it harder to snoop on email content,
> although ironically what we're likely to be able to accomplish under the
> "prism-proof"
> rubric is unlikely to much of anything about the data collection the actual
> Prism program performs.
> 
> But traffic analysis... unless the fact that those logs are likely to only
> be accessible to state entities offers some consolation, I don't think
> there's going to be much happiness here.
> 
> 				Ned
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 
> 

From doug.mtview@gmail.com  Tue Oct 29 18:25:54 2013
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Dear Stephen,

See comments inline.=20
On Oct 29, 2013, at 3:49 PM, Stephen Farrell <stephen.farrell@cs.tcd.ie> =
wrote:

>> (elided) ...some of us actually
>> want that data to prevent and investigate real and legitimate fraud =
and
>> abuse within the communications systems, optimize network transport =
etc.=20
>=20
> Countering fraud is a real requirement, agreed. I don't accept
> that that implies a requirement that pervasive monitoring be
> possible. But there are trade-offs and we do need to consider
> those carefully.
>=20
> Optimising transport seems bogus though - can you provide a
> reference or argument as to why you'd need to pervasively monitor
> in a privacy unfriendly way to do that?

A few distinctions might be useful.

Packet routing itself (assuming BCP38 is used) clarifies where a message =
originated based on the source IP address.  In the case of IPv4, this =
alone can defend a service from abuse. When dealing with encrypted =
traffic over IPv6, there is a much greater need to obtain validated =
identifiers of exchange initiators.  =46rom a transport perspective, =
this might be a certificate (PKI or DANE) associated with that of the =
client.=20

Reverse DNS will be ineffective at dealing with abuse emitted from =
compromised systems.  Most of these will employ privacy extensions which =
means caching offers little benefit.  There will also be high levels of =
DNS server timeouts with delays consuming port resources.  In addition, =
port exhaustion may not be noted in system logs.  All of this offers =
users a poor and unfriendly Internet experience.

Would having an ability to monitor source domains in conjunction with =
opaque content represent an unfriendly privacy exposure?

For example, say the domain "telco.com" is validated, but none of the =
phone numbers exchanged can be determined.  By knowing it is "telco.com" =
and not "abusive-telco.com", the receiving server can defend services =
without expending excessive port services or enduring delays waiting for =
DNS responses.

Being able to validate a domain as the source of the exchange can be =
mitigated by allowing indirection to occur as an immediate next hop.  =
While pervasive monitoring of all traffic to and from a service end =
point may give clues about intended recipients, underlying conversations =
are not exposed.  It is even conceivable next hops could represent a =
type of domain randomizer resulting from some type of domain decoding.  =
Something akin to BATV like proxy comes to mind.

Regards,
Douglas Otis







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From: Phillip Hallam-Baker <hallam@gmail.com>
To: Yoav Nir <ynir@checkpoint.com>
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Cc: perpass <perpass@ietf.org>
Subject: Re: [perpass] Metrics and Work Factor
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On Tue, Oct 29, 2013 at 2:42 AM, Yoav Nir <ynir@checkpoint.com> wrote:

>
> On Oct 29, 2013, at 4:43 AM, Phillip Hallam-Baker <hallam@gmail.com>
>  wrote:
>
> > I am at a workshop on Cyber Metrics at MIT.
> >
> > When we are talking about protection against targeted surveillance then
> we look for the cost of a single attack to be prohibitive and we accept a
> certain set of costs to the user.
> >
> > But for stopping pervasive surveillance we can't always bear those
> costs. Significantly increasing the per message work factor is still a
> benefit even if the work factor is not prohibitive for single messages.
>
> Absolutely. If we can get the cost of surveillance to be such that the NSA
> can only afford to spy on 10,000 people, it's likely that most of us will
> not be under surveillance. I believe that I don't rank anywhere on the list
> of 10,000 most dangerous terrorists or criminals.


Security researchers will always be targets because people tell us about
exploits. I avoid any contact with dissident groups precisely because there
is a risk that I am being watched for other reasons.



> That doesn't necessarily have to be measured in bits. If reading my email
> required breaking into my home and stealing the private key off of my
> computer, that would severely limit the scale.
>

Please don't limit the threat model to the NSA. Yes they have goofed and
they understand that. And every public and private piece of information I
have on the matter points to a massive editing session taking place on the
senior ranks of the entire intel apparatus of the US right now.

But the new threat model includes all the governments aspiring to copy the
Snowden era NSA.

And pretty soon quite a few governments besides the US govt. are going to
realize that they are now in a decidedly negative sum game.


Cryptography is not about defending secrets, it is about enabling. Think of
all the Internet commerce happening today because of cryptography. That is
what, a trillion dollars of global activity a year?

So far we have only secured the Web to create the Internet equivalent of
shops. We still don't have secure mail to compliment that.

I don't know how much economic value we can generate with the next
generation of Internet crypto but I will bet it is in the tens or the
hundreds of billions.

-- 
Website: http://hallambaker.com/

--001a11c2672ada9ef804e9ecc00a
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">On Tue, Oct 29, 2013 at 2:42 AM, Yoav Nir <span dir=3D"ltr=
">&lt;<a href=3D"mailto:ynir@checkpoint.com" target=3D"_blank">ynir@checkpo=
int.com</a>&gt;</span> wrote:<br><div class=3D"gmail_extra"><div class=3D"g=
mail_quote">

<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><br>
On Oct 29, 2013, at 4:43 AM, Phillip Hallam-Baker &lt;<a href=3D"mailto:hal=
lam@gmail.com" target=3D"_blank">hallam@gmail.com</a>&gt;<br>
<div><div>=A0wrote:<br>
<br>
&gt; I am at a workshop on Cyber Metrics at MIT.<br>
&gt;<br>
&gt; When we are talking about protection against targeted surveillance the=
n we look for the cost of a single attack to be prohibitive and we accept a=
 certain set of costs to the user.<br>
&gt;<br>
&gt; But for stopping pervasive surveillance we can&#39;t always bear those=
 costs. Significantly increasing the per message work factor is still a ben=
efit even if the work factor is not prohibitive for single messages.<br>


<br>
</div></div>Absolutely. If we can get the cost of surveillance to be such t=
hat the NSA can only afford to spy on 10,000 people, it&#39;s likely that m=
ost of us will not be under surveillance. I believe that I don&#39;t rank a=
nywhere on the list of 10,000 most dangerous terrorists or criminals. </blo=
ckquote>

<div><br></div><div>Security researchers will always be targets because peo=
ple tell us about exploits. I avoid any contact with dissident groups preci=
sely because there is a risk that I am being watched for other reasons.<br>

</div><div><br></div><div>=A0</div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(20=
4,204,204);border-left-style:solid;padding-left:1ex">That doesn&#39;t neces=
sarily have to be measured in bits. If reading my email required breaking i=
nto my home and stealing the private key off of my computer, that would sev=
erely limit the scale.<span><font color=3D"#888888"><br>


</font></span></blockquote></div><br>Please don&#39;t limit the threat mode=
l to the NSA. Yes they have goofed and they understand that. And every publ=
ic and private piece of information I have on the matter points to a massiv=
e editing session taking place on the senior ranks of the entire intel appa=
ratus of the US right now.<br clear=3D"all">

<div><br></div><div>But the new threat model includes all the governments a=
spiring to copy the Snowden era NSA.</div><div><br></div><div>And pretty so=
on quite a few governments besides the US govt. are going to realize that t=
hey are now in a decidedly negative sum game.</div>

<div><br></div><div><br></div><div>Cryptography is not about defending secr=
ets, it is about enabling. Think of all the Internet commerce happening tod=
ay because of cryptography. That is what, a trillion dollars of global acti=
vity a year?</div>
<div><br></div><div>So far we have only secured the Web to create the Inter=
net equivalent of shops. We still don&#39;t have secure mail to compliment =
that.</div><div><br></div><div>I don&#39;t know how much economic value we =
can generate with the next generation of Internet crypto but I will bet it =
is in the tens or the hundreds of billions.</div>
<div><br></div>-- <br>Website: <a href=3D"http://hallambaker.com/" target=
=3D"_blank">http://hallambaker.com/</a><br>

</div></div>

--001a11c2672ada9ef804e9ecc00a--

From ned+perpass@mrochek.com  Tue Oct 29 22:52:15 2013
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From: ned+perpass@mrochek.com
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References: <CA+9kkMAq5ERGVniR8VwHc1dv3=mD38ZfoCriOPtFK+=2PD_2Fg@mail.gmail.com> <52644423.1090800@cs.tcd.ie> <076e01ceceef$93ad3230$bb079690$@huitema.net> <01P016UZ4CJS00004R@mauve.mrochek.com> <526BEE9A.10505@cisco.com>
To: Eliot Lear <lear@cisco.com>
Cc: ned+perpass@mrochek.com, 'Ted Hardie' <ted.ietf@gmail.com>, Christian Huitema <huitema@huitema.net>, perpass@ietf.org, 'Stephen Farrell' <stephen.farrell@cs.tcd.ie>
Subject: Re: [perpass] Some personal thoughts on the impact	of	pervasive	monitoring
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> Hi Ned,

> On 10/26/13 4:48 PM, ned+perpass@mrochek.com wrote:
> >> Networking standards are promoted by consensus and by network effects. In
> >> the absence of some forcing function, "fallback to clear text" gets promoted
> >> by network effects, because it is de facto forced by the sites that don't
> >> bother deploying the more secure options. The best way to break that is to
> >> provide "air cover" for security, e.g. a text in the protocol description
> >> RFC that says "nodes requiring a modicum of security SHOULD refuse to use
> >> clear text connections."  That would effectively turn the tables.
> > Exactly! The only thing I would add is that "cover" should include a
> > clear presentation of the tradeoffs and consequences.
> >
> > Unfortunately this is surprisingly hard to do well. It's much easier to start
> > throwing MUSTs around.
> >
> > This also is effectively what happened in the IMAP case: Large sites like gmail
> > and Apple only deployed imaps, with the result that a fully standards-compliant
> > client actually won't work with their service!

> And maybe that's a good thing, by the way.

Getting the right outcome is definitely a good thing. But let's not pretend
that luck wasn't a big factor.

> But my main point is that
> the IAB is reviewing this exact topic at a workshop that will take place
> in December on Internet Tecnology Adoption and Transition.

Question: Has anyone been invited that has designed or directly overseen large
server deployments of any sort? It might be instructive to hear from someone
like that.

>  It's not the
> first time it's been considered, mind you.  See RFC 5218 by Dave Thaler
> and Bernard Aboba.

Yep.

				Ned

From rutkowski.tony@gmail.com  Wed Oct 30 04:48:09 2013
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From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Subject: Re: [perpass] Traffic analysis
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Hi Rich,

One gets the feeling that there are a fair number
of people here who are basically humorless and
probably don't watch VEEP! C'est la vie.

One saving grace is that the folks here who are
attempting to make life more difficult for those
doing commercial and government analysis are
basically cataloging techniques for which counter
measures can be taken.  So in that sense, this
other wise offensive list that serves the IETF
poorly, does have value.

--tony

On 10/29/2013 5:43 PM, Richard Shockey wrote:
> I totally agree with this statement. " I think there are small technical
> changes around the edges that can help, but I really see the solutions for
> the metadata problem as more political and social than technical.
> Concentrating on making encryption really, really easy to use would go a lot
> further at this time than messing with deep changes, because people are not
> even using what is already available."
>
> Though I would not have used Tony's precise language on a public mail.  I'm
> afraid I agree with the underlying sentiment.
>


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Subject: Re: [perpass] Traffic analysis
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-----Original Message-----
From: Stephen Farrell [mailto:stephen.farrell@cs.tcd.ie] 
Sent: Tuesday, October 29, 2013 6:49 PM
To: Richard Shockey
Cc: perpass@ietf.org
Subject: Re: [perpass] Traffic analysis


Hi Rich,

On 10/29/2013 09:43 PM, Richard Shockey wrote:
> 
> Ned makes a number of excellent points here and the real elephant in 
> the room is under what terms and conditions is the ongoing collection 
> of metadata about IP communications in any form actually needed and in 
> fact absolutely necessary.

To the extent I can parse that, it seems like blatant assertion.

> There are perfectly good reasons to collect this stuff.   Though the
ongoing
> concern of this list is clearly the Snowden revelations some of us 
> actually want that data to prevent and investigate real and legitimate 
> fraud and abuse within the communications systems, optimize network
transport etc.

Countering fraud is a real requirement, agreed. I don't accept that that
implies a requirement that pervasive monitoring be possible. But there are
trade-offs and we do need to consider those carefully.

[RS> ] Of course, then please define what you mean by pervasive monitoring.
Is it just monitoring by nation state actors or are you including British
Telecom, ATT, Google, Yahoo and Amazon etal  into the mix. 

Optimising transport seems bogus though - can you provide a reference or
argument as to why you'd need to pervasively monitor in a privacy unfriendly
way to do that?
[RS> ] 
[RS> ] That is simple traffic engineering. This is friendly pervasive
monitoring. Any reasonable network operator wants to know where its IP
traffic is coming from and where it is going. That provides the essential
data to optimize Layer 1 links and all sorts of other stuff not to mention
the negotiation of transit peering agreements.  If I can see from the IP
packets an asynchronous volume of traffic coming from one particular AS then
my peering coordinator will have a friendly chat with their counterpart.
This has reared its ugly head is several well-known incidents specifically
involving CDN. The well-known one is the US Comcast vs Level 3 dispute
instantly comes to mind. 

The difference between pervasive surveillance and traffic management is ONE
Octet.   Deep Packet Inspection is a fact of life. How you plan or ridding
the planet of that petulance is beyond my feeble brain.  

> First if you take a little stroll over to the IETF STIR problem 
> statement you will see that fraudulent voice communications is becoming a
huge problem
> for National Regulators and Law Enforcement.   In the US the failure of
> Rural Calls to certain areas now requires the US carriers to maintain ever
> larger CDR records in order to preserve the integrity of the PSTN itself.


I think STIR is a red herring here. Adding STIR doesn't really affect
pervasive monitoring since the overwhelming majority of calls already use
valid phone numbers so STIR doesn't really add to the ability to pervasively
monitor.

[RS> ] So long as the majority of traffic is still TDM/SS7 based but we are
rapidly moving down a path that will no longer be the case which is why the
STIR problem statement is actually very important and very relevant to this
discussion.   I want to know who is trying to contact me and from where. 

Now if we had a mechanism that added a useful signature whilst disguising
the caller identity, that might be interesting. 

[RS> ]  I still want to track and trace the traffic.  I'd want to see what
your suggestion looks like but annominity can be used as a shield for
something more nefarious.  My running assumption here is the "The needs of
many ( to be left alone) outweigh the needs of the few."  There are actually
moral dilemmas here that have to be considered in the larger context.  

Or one that used a public key previously used to verify a signature to
encrypt call setup. And STIR does offer longer term possibilities for both
of those.
[RS> ] 
[RS> ] Agreed. 

So I don't see STIR as being "for" or "against" pervasive monitoring.
Same as for any authentication mechanism.

But yes, there are privacy issues related to STIR that do need to be
considered.

[RS> ] Who's privacy? The calling party or the called party.   This is my
point. Enabling privacy for one may violate the privacy of the other. Now we
are really blasting past Layer 8-10 Economic Political and Religious into
Layer 11 Philosophy.   I'm totally incompetent to make judgments on that
Layer.  

> http://www.fcc.gov/document/fcc-acts-combat-call-completion-problems-r
> ural-a
> merica
> 
> Consumers are totally outraged by the violations of THEIR PRIVACY... 
> the right to be left alone... by malicious Robo Callers who ignore the
various
> Laws about Do Not Call lists etc.   E-Mail spam has not gone away by any
> account but the need for logs and records to attempt to track criminal 
> activity is still required.  We want to hunt these people down and 
> shut down their operations.

Yes, helping folks block robo-calls is a good. I don't think STIR is meant
to actually define how to hunt anyone down though:-)

[RS> ] You might think that.. I couldn't possibly comment.  But it is a
valuable tool to validate trusted traffic from SIP UA to UA. So how do I
hunt down robo callers? I have the drones fueled and ready. My point is we
still need track and trace for perfectly valid reasons any consumer or
enterprise can understand.  STIR as you well know is no "silver bullet" it's
a tool. One of many. The problem is well understood.  I'll post to STIR
later further comments on other ideas such as Enhanced CNAM etc.  People who
really want to communicate to someone they have no prior relationship with
should have the tools available to fully identify themselves.   That is a
good thing.  We can do productive work there. 

I'm also not at all sure that logging all the ham is required to help track
spammers.

[RS> ] Ask the people who have been defrauded.  There are really two sides
to this which is my larger point.  


> The issue is appropriate safeguards on those records and there is 
> essentially nothing the IETF can do about that.
> 
> It is useful to talk about strengthening key length and understanding 
> to underlying archectural reasons no one really wants to deploy secure 
> communications.
> 
> I totally agree with this statement. " I think there are small 
> technical changes around the edges that can help, but I really see the 
> solutions for the metadata problem as more political and social than
technical.

There is a political angle sure. And that's not an IETF concern since the
politics seem to be very different in different places.
Basically, the same logic as is set out in RFC 2804 applies to that I think.

RS>  2804 was a very appropriate statement but there is a underlying thread
here that is running counter to those principals.  

However, I very much disagree that this is *only* political. If whoever is
your favorite authority can pervasively monitor everyone then so can others
that you don't like so much. And that's true for all values of "authority",
at least in principle and quite likely in practice, at least at some scale.
And if we can have such bad actors, there's no reason why they need to be
nation states at all.
Plain old criminals can play this game and will. I believe we do have good
technical reasons for wanting to counter pervasive monitoring.

Having said all that, yes, I do agree that doing more than making the crypto
stuff easier/better is hard. Doesn't mean we shouldn't try though, if we
really want to do better on privacy.

RS> Then you need to define who's privacy you want to defend. 

Regards,
S.

> Concentrating on making encryption really, really easy to use would go 
> a lot further at this time than messing with deep changes, because 
> people are not even using what is already available."
> 
> Though I would not have used Tony's precise language on a public mail.
I'm
> afraid I agree with the underlying sentiment.   
> 
> There are more than one joke running around Washington DC about 
> actually wanting the NSA to keep the CDR records if they would 
> actually use them to stop robo calls and call spoofing.
> 
> 
> 
> -----Original Message-----
> From: perpass-bounces@ietf.org [mailto:perpass-bounces@ietf.org] On 
> Behalf Of ned+perpass@mrochek.com
> Sent: Monday, October 28, 2013 2:30 PM
> To: Joe St Sauver
> Cc: perpass@ietf.org; huitema@huitema.net; stephen.farrell@cs.tcd.ie
> Subject: Re: [perpass] Traffic analysis
> 
>> Hi,
> 
>> Stephen Farrell <stephen.farrell@cs.tcd.ie>:
> 
>> #Not quite sure, but I think we might get some benefit at the #moment 
>> from considering how specific fields in real protocols #undermine 
>> privacy (e.g. as Christian's draft does with the #Received header 
>> fields in mail messages) even if/when TLS or #other existing security 
>> mechanisms are properly used.
> 
>> My concern is that many traffic analytic approaches tend to be 
>> exceedingly robust to "protocol improvements." Protocol tweaks may 
>> accomplish little when it comes to practically improving privacy if 
>> the underlying protocol's architecture and operational practice goes 
>> unchanged.
> 
>> For example, when it comes to email, shouldn't section 6 of 
>> http://huitema.net/papers/draft-huitema-perpass-analthreat-00.txt
>> basically say, "if you want to avoid traffic analytic approaches in 
>> the case of email, deploy and use Mixmaster anonymous remailers"?
>> (
>> https://en.wikipedia.org/wiki/Anonymous_remailers#Untraceable_remaile
>> r
>> s )
> 
> And good luck with that, at least on any kind of scale.
> 
> But your underlying point is very well taken: The section on email in 
> this draft focuses on irrelevancies and fails to take note of the real
issues.
> 
> I hate to sound like a broken record, but folks really need to have 
> some familiarity with present-day email as it is actually deployed 
> before making these sorts of asssessments.
> 
> Again, present day email usage is increasingly concentrated to a 
> fairly small number of large ISPs and MSPs. (Small ISPs and enterprise 
> setups are shifting to using cloud services, and while the Snowden 
> revelations may have slowed this trend, they haven't stopped it.)
> 
> In regards to traffic analysis, this is in some ways a good thing. If 
> the connections from user clients to the ISP/MSP servers are secured 
> at the transport layer - and I have demonstrated that a lot of them 
> are - then we gain a lot by securing the streams between the large 
> providers at the transport level.
> 
> But the elephant in the corner is logging. Service providers maintain 
> very extensive logs of email traffic, if for no other reason than as a 
> support tool. These logs provide every possible detail needed for traffic
analysis.
> 
> Of course one of the earliest Snowden revelations was that the NSA is 
> collecting these logs from US providers on a massive scale. And 
> hopefully everyone is aware of Smith v. Maryland, which essentialls 
> says that metadata is not constitutionally protected.
> 
> But before Eupopeans and others get all smug about this, speaking as 
> someone who has seen quite a few RFPs for mail systems, the only 
> substantive difference I see between the US and elsewhere is the US 
> approaches this in a less organized and systematic way and generally 
> has fewer auditing and data protection requirements. The data is still 
> being collected, and most likely shareed.
> 
> And as for practical and deployable measures that can be undertaken to 
> address this, I'm at something of a loss to suggest anything. Shifting 
> back to a more decentralized model sounds nice, but seems a bit 
> outside the purview of a standards process to try and make that happen.
> 
> And even if it a completely decentralized model was practical, in a 
> peer-to-peer world the metadata that would accrue from watching the 
> connections themselves would be a fair substitute.
> 
> As for mixed models, look at what happened to Lavabit.
> 
>> And if we *are* talking about that sort of approach, then I think 
>> inevitably we also need to talk about how we simultaneously manage to 
>> allow *wanted* private traffic while simultaneously preventing or 
>> managing *unwanted traffic* (e.g., spam).
> 
> Yep. It's a daunting problem. And it is far from the only one.
> 
>> An awful lot of current anti-spam technology depends upon either 
>> reputation (which is obviously not present in the case of 
>> anonymous/non-attributable traffic), or content analysis (which is 
>> also obviously problematic, at least if we presume use of end-to-end 
>> encryption (at least until the content is decrypted on the end-user's 
>> device)).
> 
> You basically have to push the content checks to the client. This has 
> not proven to be a terrific solution in practice.
> 
>> I also think that if you're serious about email privacy, you really 
>> can't keep the discussion just at the level of sanitizing headers. 
>> You need to get into the format of the content that's allowed as 
>> well. For example, it's well known that non-plain text email content 
>> (e.g., HTML-formatted email) is potentially a serious threat to 
>> privacy due to potential use of things like tracking gifs included in 
>> HTML-formatted email.
> 
> I think we can do a lot to make it harder to snoop on email content, 
> although ironically what we're likely to be able to accomplish under 
> the "prism-proof"
> rubric is unlikely to much of anything about the data collection the 
> actual Prism program performs.
> 
> But traffic analysis... unless the fact that those logs are likely to 
> only be accessible to state entities offers some consolation, I don't 
> think there's going to be much happiness here.
> 
> 				Ned
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
> 
> 
> 


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On this point, it's my turn to sound like a broken record:

On 10/28/13 7:30 PM, ned+perpass@mrochek.com wrote:
> And even if it a completely decentralized model was practical, in a
> peer-to-peer world the metadata that would accrue from watching the
> connections themselves would be a fair substitute.

This is another really important point.  I'm sure many of us had the
first reaction that all this stuff should be decentralized, which of
course leads to "let's all get to IPv6".  To the extent that consumers
are able to have a choice about this, it's quite possible that a
decentralized model using our existing protocol suite could *harm*
privacy as Ned mentioned above.  Beyond that, one has to ponder what
externalities are introduced by having yet more consumer code accessible
to the great wild world.  Ironically, this Saturday, November 2nd, will
be the 25th anniversary of the Morris Worm.[1] <#1>  The world has
improved since that time.  A few things to highlight along these lines. 
One of my favorite studies to cite is that of Stephan Frei who looked at
update rates and compared business models.[2] <#2>  It seems that now
even WordPress is doing this[3] <#3>, but we are certainly not there yet
with certain systems.  I'm thinking of code used in SCADA systems and
automobiles in particular.  There are sometimes tradeoffs between
privacy and cybersecurity.  Many are specifically*not* protocol
tradeoffs, but operational tradeoffs.  Aggregation of services probably
is a good thing for cybersecurity â€“ that's probably a worthy research
topic, by the way.

There is plenty of room for investigation and review of all of this, but
coming back to Paul's earlier warning[4] <#4> that he forwarded, let's
be thorough before jumping to recommendations for broad IETF changes. 
And let's please understand what tradeoffs there are.

Eliot

[1] http://en.wikipedia.org/wiki/Morris_worm
[2] http://www.techzoom.net/publications/silent-updates/index.en
[3] http://wordpress.org/news/2013/10/basie/
[4] http://www.ietf.org/mail-archive/web/perpass/current/msg00654.html

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<html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    On this point, it's my turn to sound like a broken record:<br>
    <br>
    <div class="moz-cite-prefix">On 10/28/13 7:30 PM,
      <a class="moz-txt-link-abbreviated" href="mailto:ned+perpass@mrochek.com">ned+perpass@mrochek.com</a> wrote:<br>
    </div>
    <blockquote cite="mid:01P04ABSOR0E00004R@mauve.mrochek.com"
      type="cite">
      And even if it a completely decentralized model was practical, in
      a
      peer-to-peer world the metadata that would accrue from watching
      the connections
      themselves would be a fair substitute.<br>
    </blockquote>
    <br>
    This is another really important point.Â  I'm sure many of us had the
    first reaction that all this stuff should be decentralized, which of
    course leads to "let's all get to IPv6".Â  To the extent that
    consumers are able to have a choice about this, it's quite possible
    that a decentralized model using our existing protocol suite could <b>harm</b>
    privacy as Ned mentioned above.Â  Beyond that, one has to ponder what
    externalities are introduced by having yet more consumer code
    accessible to the great wild world.Â  Ironically, this Saturday,
    November 2nd, will be the 25th anniversary of the Morris Worm.<a
      href="#1">[1]</a>Â  The world has improved since that time.Â  A few
    things to highlight along these lines.Â  One of my favorite studies
    to cite is that of Stephan Frei who looked at update rates and
    compared business models.<a href="#2">[2]</a>Â  It seems that now
    even WordPress is doing this<a href="#3">[3]</a>, but we are
    certainly not there yet with certain systems.Â  I'm thinking of code
    used in SCADA systems and automobiles in particular.Â  There are
    sometimes tradeoffs between privacy and cybersecurity.Â  Many are
    specifically<b> not</b> protocol tradeoffs, but operational
    tradeoffs.Â  Aggregation of services probably is a good thing for
    cybersecurity â€“ that's probably a worthy research topic, by the way.<br>
    <br>
    There is plenty of room for investigation and review of all of this,
    but coming back to Paul's earlier warning<a href="#4">[4]</a> that
    he forwarded, let's be thorough before jumping to recommendations
    for broad IETF changes.Â  And let's please understand what tradeoffs
    there are.<br>
    <br>
    Eliot<br>
    <br>
    <a name="1"></a>[1] <a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/Morris_worm">http://en.wikipedia.org/wiki/Morris_worm</a><br>
    <a name="2"></a>[2]
    <a class="moz-txt-link-freetext" href="http://www.techzoom.net/publications/silent-updates/index.en">http://www.techzoom.net/publications/silent-updates/index.en</a><br>
    <a name="3"></a>[3] <a class="moz-txt-link-freetext" href="http://wordpress.org/news/2013/10/basie/">http://wordpress.org/news/2013/10/basie/</a><br>
    <a name="4"></a>[4]
    <a class="moz-txt-link-freetext" href="http://www.ietf.org/mail-archive/web/perpass/current/msg00654.html">http://www.ietf.org/mail-archive/web/perpass/current/msg00654.html</a><br>
  </body>
</html>

--------------040202070208070303080408--

From joe@oregon.uoregon.edu  Wed Oct 30 10:29:31 2013
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Hi,

Eliot Lear commented:

#I'm sure many of us had the first reaction that all this stuff should 
#be decentralized, which of course leads to "let's all get to IPv6".  
#To the extent that consumers are able to have a choice about this, 
#it's quite possible that a decentralized model using our existing 
#protocol suite could *harm* privacy as Ned mentioned above.  Beyond 
#that, one has to ponder what externalities are introduced by having 
#yet more consumer code accessible to the great wild world.  

I. From my POV, IPv6 has the potential to either help OR harm privacy,
depending on the addressing model employed.

On the one hand, IPv6 privacy addresses, at least if used in a 
relatively densely populated and actively used IPv6 /64, has the
potential to make it harder to persistently track individual users.
(If you're one of just a handful of IPv6 users in a given /64, or 
the *only* IPv6 user in a given /64, privacy addresses are less 
helpful when it comes to making tracking difficult). 

Many sites deploying IPv6 may routinely deprecate or discourage use 
of IPv6 privacy addresses, however. 

-- If SLAAC is being used, instead, and a modified EUI-64 address is 
embedded in the IPv6 address, I would assert that privacy is *worse*
than the IPv4 case, since that embedded MAC address allows persistent 
per-device (and in the case of dedicated end-points, per-user) tracking.

-- If DHCPv6 is being used, I would assert that it has privacy 
properties essentially *equivalent* to IPv4 addresses assigned via 
DHCP (e.g., the address assigning entity can typically map the user's 
assigned address to a given entity, whether that's an ethernet jack
in an assigned office or an authenticated wireless identity, etc.)

So depending on the addressing model, you may see equivalent privacy,
better privacy, or worse privacy from using IPv6.

II. I'd also note, addressing aside, that IPv6 application traffic may 
be more likely than IPv4 traffic to end up getting forced through 
intentionally introduced control points. 

That is, coming back to mail, I wouldn't expect most ISP mail servers,
even if they were enabled to accept IPv6 traffic (and make no mistake,
most aren't), to accept mail traffic from random IPv6 end points. 

In most cases, if you want SMTP traffic over IPv6 to be accepted by 
major providers, it will need to be relayed via a mail server that has 
been specially configured for that role. (Terry Zink has done some nice 
work in this area, see for example
http://blogs.msdn.com/b/tzink/archive/2013/09/11/supporting-email-over-ipv6-part-1-an-introduction.aspx )

Of course, any time you have a control point, that control point exists in
part to "process" traffic -- hopefully handling things like filtering 
unwanted spam and malware, but we cannot discount the possibility that 
national authorities may also leverage that choke point for monitoring 
purposes.

Eliot also commented:

#One of my favorite studies to cite is that of Stephan Frei who looked at
#update rates and compared business models. [snip] I'm thinking of code 
#used in SCADA systems and automobiles in particular. 

Almost ten years ago now, I was invited to do a talk about SCADA security
and critical infrastructure for the local Infragard chapter. While that's
an old talk, sadly all too little has changed since then. If you want to
eyeball it, see http://pages.uoregon.edu/joe/scadaig/infraguard-scada.pdf

On slide 41, I noted that plants and the instrumentation they use tend
to have long life cycles -- ten, fifteen or even twenty year projects in
many cases. What gets installed at the birth of that project may still
be in use a decade or more later. (And of course, that can be the
equivalent of having a "Model T" on I-95)

On slide 43, I noted that many remote devices tend to be hard or impossible
to upgrade. Code may be burned in a ROM, and upgrading code may involve
replacing ROMs. Devices may be physically sealed and non-upgradeable. Or
devices may be located in hard-to-reach locations (top of a smokestack,
perhaps) or the vendor that produced the device may no longer be in business.
Upgrades may simply be rare or non-existent.

You get the idea. My point is that patching cycles that are routinely 
expected and accepted in the enterprise space may be completely impractical
in the control system space.

Of course, the historical excuse for tolerating this was, "Oh, but these 
devices will be run over a dedicated network airgapped from the Internet," 
but naturally, over time, things like Bob Radvanovsky's "Project SHINE" have
empirically illustrated that theory and practice diverged somewhere along
the line. (For a recent article on Project SHINE, see for example
http://www.darkreading.com/vulnerability/project-shine-illuminates-sad-state-of-s/240162739 )

Regards,

Joe

From lear@cisco.com  Wed Oct 30 10:57:30 2013
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Date: Wed, 30 Oct 2013 18:55:51 +0100
From: Eliot Lear <lear@cisco.com>
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Hi Joe,

On 10/30/13 5:52 PM, Joe St Sauver wrote:
> Of course, any time you have a control point, that control point exists in
> part to "process" traffic -- hopefully handling things like filtering 
> unwanted spam and malware, but we cannot discount the possibility that 
> national authorities may also leverage that choke point for monitoring 
> purposes.

That's an important point.  And so when a service offers a
spamfree/malware-free environment with few bugs, it still comes at a cost.

Eliot

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From: Vidya Narayanan <vn@google.com>
To: Bjoern Hoehrmann <derhoermi@gmx.net>
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--047d7b6da1f6370c7304e9f93b15
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Hi,
I may be missing something here, but your wording seems to suggest that the
user may not trust the server?  If so, that is definitely not the targeted
case under discussion.  The assumption here is that the client (and hence
the user) and the server trust each other, but they don't necessarily trust
all middleboxes.

If I have not understood you correctly, please let me know.

Regards,
Vidya


On Tue, Oct 29, 2013 at 6:51 AM, Bjoern Hoehrmann <derhoermi@gmx.net> wrote=
:

> * Vidya Narayanan wrote:
> >All,
> >http://tools.ietf.org/id/draft-vidya-httpbis-explicit-proxy-ps-00.txt is
> a
> >problem statement on the need for explicit proxying in HTTP.
>
> I have a suggestion. From the document:
>
>    The use of proxies leads to a number of privacy issues.  To
>    summarize:
>
>    ...
>
>    o  The server has no knowledge of the presence of the proxy and
>       hence, cannot refuse to serve sensitive content over a proxied
>       connection.
>
>    o  The weakened security model, when certificate pinning is disabled
>       at a general level, allows inspection of content ...
>
>    ...
>
>    With privacy becoming more and more important, it is important for us
>    to support solutions that allow awareness of a privacy breach to both
>    users and the servers, when that happens.  To this effect, it is
>    important that proxies be explicitly supported and detected.
>
>    ...
>
>    o  Content providers may not wish to serve certain content in
>       anything less than an end-to-end secure fashion.
>
> How about including in the Goals section that users must be able to
> verify the behavior of untrusted user agents without interference on
> part of the server, which requires the user being able to inspect any
> content without the server knowing, possibly by use of a proxy?
>
> I also note that allowing servers to be aware when my "privacy" has
> been "breached" in all likelyhood makes that breach worse, not better.
> --
> Bj=F6rn H=F6hrmann =B7 mailto:bjoern@hoehrmann.de =B7 http://bjoern.hoehr=
mann.de
> Am Badedeich 7 =B7 Telefon: +49(0)160/4415681 =B7 http://www.bjoernsworld=
.de
> 25899 Dageb=FCll =B7 PGP Pub. KeyID: 0xA4357E78 =B7 http://www.websitedev=
.de/
>

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<div dir=3D"ltr">Hi,<div>I may be missing something here, but your wording =
seems to suggest that the user may not trust the server? =A0If so, that is =
definitely not the targeted case under discussion. =A0The assumption here i=
s that the client (and hence the user) and the server trust each other, but=
 they don&#39;t necessarily trust all middleboxes.=A0</div>
<div><br></div><div>If I have not understood you correctly, please let me k=
now.=A0</div><div><br></div><div>Regards,<br>Vidya=A0</div></div><div class=
=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Tue, Oct 29, 2013 at=
 6:51 AM, Bjoern Hoehrmann <span dir=3D"ltr">&lt;<a href=3D"mailto:derhoerm=
i@gmx.net" target=3D"_blank">derhoermi@gmx.net</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im">* Vidya Narayanan wrote:<b=
r>
&gt;All,<br>
&gt;<a href=3D"http://tools.ietf.org/id/draft-vidya-httpbis-explicit-proxy-=
ps-00.txt" target=3D"_blank">http://tools.ietf.org/id/draft-vidya-httpbis-e=
xplicit-proxy-ps-00.txt</a> is a<br>
&gt;problem statement on the need for explicit proxying in HTTP.<br>
<br>
</div>I have a suggestion. From the document:<br>
<br>
=A0 =A0The use of proxies leads to a number of privacy issues. =A0To<br>
=A0 =A0summarize:<br>
<br>
=A0 =A0...<br>
<br>
=A0 =A0o =A0The server has no knowledge of the presence of the proxy and<br=
>
=A0 =A0 =A0 hence, cannot refuse to serve sensitive content over a proxied<=
br>
=A0 =A0 =A0 connection.<br>
<br>
=A0 =A0o =A0The weakened security model, when certificate pinning is disabl=
ed<br>
=A0 =A0 =A0 at a general level, allows inspection of content ...<br>
<br>
=A0 =A0...<br>
<br>
=A0 =A0With privacy becoming more and more important, it is important for u=
s<br>
=A0 =A0to support solutions that allow awareness of a privacy breach to bot=
h<br>
=A0 =A0users and the servers, when that happens. =A0To this effect, it is<b=
r>
=A0 =A0important that proxies be explicitly supported and detected.<br>
<br>
=A0 =A0...<br>
<br>
=A0 =A0o =A0Content providers may not wish to serve certain content in<br>
=A0 =A0 =A0 anything less than an end-to-end secure fashion.<br>
<br>
How about including in the Goals section that users must be able to<br>
verify the behavior of untrusted user agents without interference on<br>
part of the server, which requires the user being able to inspect any<br>
content without the server knowing, possibly by use of a proxy?<br>
<br>
I also note that allowing servers to be aware when my &quot;privacy&quot; h=
as<br>
been &quot;breached&quot; in all likelyhood makes that breach worse, not be=
tter.<br>
<span class=3D"HOEnZb"><font color=3D"#888888">--<br>
Bj=F6rn H=F6hrmann =B7 mailto:<a href=3D"mailto:bjoern@hoehrmann.de">bjoern=
@hoehrmann.de</a> =B7 <a href=3D"http://bjoern.hoehrmann.de" target=3D"_bla=
nk">http://bjoern.hoehrmann.de</a><br>
Am Badedeich 7 =B7 Telefon: <a href=3D"tel:%2B49%280%29160%2F4415681" value=
=3D"+491604415681">+49(0)160/4415681</a> =B7 <a href=3D"http://www.bjoernsw=
orld.de" target=3D"_blank">http://www.bjoernsworld.de</a><br>
25899 Dageb=FCll =B7 PGP Pub. KeyID: 0xA4357E78 =B7 <a href=3D"http://www.w=
ebsitedev.de/" target=3D"_blank">http://www.websitedev.de/</a><br>
</font></span></blockquote></div><br></div>

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* Vidya Narayanan wrote:
>I may be missing something here, but your wording seems to suggest that the
>user may not trust the server?  If so, that is definitely not the targeted
>case under discussion.  The assumption here is that the client (and hence
>the user) and the server trust each other, but they don't necessarily trust
>all middleboxes.

You buy a smartphone. You come to suspect it may have a bug that makes
it send encrypted data over the wire it should not be sending. You con-
figure a MITM proxy and try to trigger the bug. You detect the phone
starts sending data to a server, but the server cuts the connection as
it detects the proxy.

So you cannot verify what the smartphone actually sends, you are not in
control. "Privacy" and end-to-end security require the user to be in
control, so that a server "cannot refuse to serve sensitive content over
a proxied connection" is a good thing, while you list it as a problem.
My suggestion was to include a Goal to ensure that users are in control.
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de
25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ 

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Cc: Vidya Narayanan <vn@google.com>, perpass@ietf.org, hannes.tschofenig@gmx.net
Subject: Re: [perpass] Explicit proxying in HTTP
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Hi Vidya, Hi Bjoern,

the term "trust" is quite tricky. You may trust someone to do X but not 
Y. Hence, you have to say what you believe the "client" (user, I guess) 
trusts the server for.

Just think about the concept of 'secondary use'.

Ciao
Hannes


Am 30.10.13 20:40, schrieb Bjoern Hoehrmann:
> * Vidya Narayanan wrote:
>> I may be missing something here, but your wording seems to suggest that the
>> user may not trust the server?  If so, that is definitely not the targeted
>> case under discussion.  The assumption here is that the client (and hence
>> the user) and the server trust each other, but they don't necessarily trust
>> all middleboxes.
>
> You buy a smartphone. You come to suspect it may have a bug that makes
> it send encrypted data over the wire it should not be sending. You con-
> figure a MITM proxy and try to trigger the bug. You detect the phone
> starts sending data to a server, but the server cuts the connection as
> it detects the proxy.
>
> So you cannot verify what the smartphone actually sends, you are not in
> control. "Privacy" and end-to-end security require the user to be in
> control, so that a server "cannot refuse to serve sensitive content over
> a proxied connection" is a good thing, while you list it as a problem.
> My suggestion was to include a Goal to ensure that users are in control.
>


From erik.josefsson@europarl.europa.eu  Wed Oct 30 14:39:48 2013
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From: JOSEFSSON Erik <erik.josefsson@europarl.europa.eu>
To: Hannes Tschofenig <hannes.tschofenig@gmx.net>, Bjoern Hoehrmann <derhoermi@gmx.net>
Thread-Topic: [perpass] Explicit proxying in HTTP
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Cc: Vidya Narayanan <vn@google.com>, "perpass@ietf.org" <perpass@ietf.org>
Subject: Re: [perpass] Explicit proxying in HTTP
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Here's a woman I trust on trust:=0A=
=0A=
http://www.ted.com/talks/onora_o_neill_what_we_don_t_understand_about_trust=
.html=0A=
=0A=
//Erik=0A=
________________________________________=0A=
From: perpass-bounces@ietf.org [perpass-bounces@ietf.org] on behalf of Hann=
es Tschofenig [hannes.tschofenig@gmx.net]=0A=
Sent: Wednesday, October 30, 2013 9:03 PM=0A=
To: Bjoern Hoehrmann=0A=
Cc: Vidya Narayanan; perpass@ietf.org; hannes.tschofenig@gmx.net=0A=
Subject: Re: [perpass] Explicit proxying in HTTP=0A=
=0A=
Hi Vidya, Hi Bjoern,=0A=
=0A=
the term "trust" is quite tricky. You may trust someone to do X but not=0A=
Y. Hence, you have to say what you believe the "client" (user, I guess)=0A=
trusts the server for.=0A=
=0A=
Just think about the concept of 'secondary use'.=0A=
=0A=
Ciao=0A=
Hannes=0A=
=0A=
=0A=
Am 30.10.13 20:40, schrieb Bjoern Hoehrmann:=0A=
> * Vidya Narayanan wrote:=0A=
>> I may be missing something here, but your wording seems to suggest that =
the=0A=
>> user may not trust the server?  If so, that is definitely not the target=
ed=0A=
>> case under discussion.  The assumption here is that the client (and henc=
e=0A=
>> the user) and the server trust each other, but they don't necessarily tr=
ust=0A=
>> all middleboxes.=0A=
>=0A=
> You buy a smartphone. You come to suspect it may have a bug that makes=0A=
> it send encrypted data over the wire it should not be sending. You con-=
=0A=
> figure a MITM proxy and try to trigger the bug. You detect the phone=0A=
> starts sending data to a server, but the server cuts the connection as=0A=
> it detects the proxy.=0A=
>=0A=
> So you cannot verify what the smartphone actually sends, you are not in=
=0A=
> control. "Privacy" and end-to-end security require the user to be in=0A=
> control, so that a server "cannot refuse to serve sensitive content over=
=0A=
> a proxied connection" is a good thing, while you list it as a problem.=0A=
> My suggestion was to include a Goal to ensure that users are in control.=
=0A=
>=0A=
=0A=
_______________________________________________=0A=
perpass mailing list=0A=
perpass@ietf.org=0A=
https://www.ietf.org/mailman/listinfo/perpass=0A=

From nvidya@google.com  Wed Oct 30 14:47:33 2013
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From: Vidya Narayanan <vn@google.com>
To: JOSEFSSON Erik <erik.josefsson@europarl.europa.eu>
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Cc: "perpass@ietf.org" <perpass@ietf.org>, Hannes Tschofenig <hannes.tschofenig@gmx.net>, Bjoern Hoehrmann <derhoermi@gmx.net>
Subject: Re: [perpass] Explicit proxying in HTTP
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--047d7b621b1cc53a3904e9fc4786
Content-Type: text/plain; charset=ISO-8859-1

Before we get into the broader definition of trust and all kinds of
possible threats, I'd like to make sure the scope of this document is
understood.  I apologize if that was not clear from my first email or the
draft itself.

This document covers the case where a client and server wish to exchange
traffic over a channel that is either end-to-end secure or is
point-to-point secured to an authorized middle box. The threats it
addresses are those due to unauthorized middle boxes and provides
guidelines and goals to make those detectable by the endpoints, including
the user.

It is not intended to tackle the general case of rogue servers or the
generic case of placing all privacy controls with the user.  It is not to
say that such goals aren't necessary for the Internet - just that this
document is written to explicitly handle only a subset as mentioned above.

Hope this helps.

Thanks,
Vidya


On Wed, Oct 30, 2013 at 2:39 PM, JOSEFSSON Erik <
erik.josefsson@europarl.europa.eu> wrote:

> Here's a woman I trust on trust:
>
>
> http://www.ted.com/talks/onora_o_neill_what_we_don_t_understand_about_trust.html
>
> //Erik
> ________________________________________
> From: perpass-bounces@ietf.org [perpass-bounces@ietf.org] on behalf of
> Hannes Tschofenig [hannes.tschofenig@gmx.net]
> Sent: Wednesday, October 30, 2013 9:03 PM
> To: Bjoern Hoehrmann
> Cc: Vidya Narayanan; perpass@ietf.org; hannes.tschofenig@gmx.net
> Subject: Re: [perpass] Explicit proxying in HTTP
>
> Hi Vidya, Hi Bjoern,
>
> the term "trust" is quite tricky. You may trust someone to do X but not
> Y. Hence, you have to say what you believe the "client" (user, I guess)
> trusts the server for.
>
> Just think about the concept of 'secondary use'.
>
> Ciao
> Hannes
>
>
> Am 30.10.13 20:40, schrieb Bjoern Hoehrmann:
> > * Vidya Narayanan wrote:
> >> I may be missing something here, but your wording seems to suggest that
> the
> >> user may not trust the server?  If so, that is definitely not the
> targeted
> >> case under discussion.  The assumption here is that the client (and
> hence
> >> the user) and the server trust each other, but they don't necessarily
> trust
> >> all middleboxes.
> >
> > You buy a smartphone. You come to suspect it may have a bug that makes
> > it send encrypted data over the wire it should not be sending. You con-
> > figure a MITM proxy and try to trigger the bug. You detect the phone
> > starts sending data to a server, but the server cuts the connection as
> > it detects the proxy.
> >
> > So you cannot verify what the smartphone actually sends, you are not in
> > control. "Privacy" and end-to-end security require the user to be in
> > control, so that a server "cannot refuse to serve sensitive content over
> > a proxied connection" is a good thing, while you list it as a problem.
> > My suggestion was to include a Goal to ensure that users are in control.
> >
>
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass
>

--047d7b621b1cc53a3904e9fc4786
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Before we get into the broader definition of trust and all=
 kinds of possible threats, I&#39;d like to make sure the scope of this doc=
ument is understood. =A0I apologize if that was not clear from my first ema=
il or the draft itself. =A0<div>
<br></div><div>This document covers the case where a client and server wish=
 to exchange traffic over a channel that is either end-to-end secure or is =
point-to-point secured to an authorized middle box. The threats it addresse=
s are those due to unauthorized middle boxes and provides guidelines and go=
als to make those detectable by the endpoints, including the user.=A0</div>
<div><br></div><div>It is not intended to tackle the general case of rogue =
servers or the generic case of placing all privacy controls with the user. =
=A0It is not to say that such goals aren&#39;t necessary for the Internet -=
 just that this document is written to explicitly handle only a subset as m=
entioned above.=A0</div>
<div><br></div><div>Hope this helps.=A0</div><div><br></div><div>Thanks,<br=
>Vidya=A0</div></div><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Wed, Oct 30, 2013 at 2:39 PM, JOSEFSSON Erik <span dir=3D"ltr">&=
lt;<a href=3D"mailto:erik.josefsson@europarl.europa.eu" target=3D"_blank">e=
rik.josefsson@europarl.europa.eu</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Here&#39;s a woman I trust on trust:<br>
<br>
<a href=3D"http://www.ted.com/talks/onora_o_neill_what_we_don_t_understand_=
about_trust.html" target=3D"_blank">http://www.ted.com/talks/onora_o_neill_=
what_we_don_t_understand_about_trust.html</a><br>
<br>
//Erik<br>
________________________________________<br>
From: <a href=3D"mailto:perpass-bounces@ietf.org">perpass-bounces@ietf.org<=
/a> [<a href=3D"mailto:perpass-bounces@ietf.org">perpass-bounces@ietf.org</=
a>] on behalf of Hannes Tschofenig [<a href=3D"mailto:hannes.tschofenig@gmx=
.net">hannes.tschofenig@gmx.net</a>]<br>

Sent: Wednesday, October 30, 2013 9:03 PM<br>
To: Bjoern Hoehrmann<br>
Cc: Vidya Narayanan; <a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</=
a>; <a href=3D"mailto:hannes.tschofenig@gmx.net">hannes.tschofenig@gmx.net<=
/a><br>
<div class=3D"im">Subject: Re: [perpass] Explicit proxying in HTTP<br>
<br>
</div><div><div class=3D"h5">Hi Vidya, Hi Bjoern,<br>
<br>
the term &quot;trust&quot; is quite tricky. You may trust someone to do X b=
ut not<br>
Y. Hence, you have to say what you believe the &quot;client&quot; (user, I =
guess)<br>
trusts the server for.<br>
<br>
Just think about the concept of &#39;secondary use&#39;.<br>
<br>
Ciao<br>
Hannes<br>
<br>
<br>
Am 30.10.13 20:40, schrieb Bjoern Hoehrmann:<br>
&gt; * Vidya Narayanan wrote:<br>
&gt;&gt; I may be missing something here, but your wording seems to suggest=
 that the<br>
&gt;&gt; user may not trust the server? =A0If so, that is definitely not th=
e targeted<br>
&gt;&gt; case under discussion. =A0The assumption here is that the client (=
and hence<br>
&gt;&gt; the user) and the server trust each other, but they don&#39;t nece=
ssarily trust<br>
&gt;&gt; all middleboxes.<br>
&gt;<br>
&gt; You buy a smartphone. You come to suspect it may have a bug that makes=
<br>
&gt; it send encrypted data over the wire it should not be sending. You con=
-<br>
&gt; figure a MITM proxy and try to trigger the bug. You detect the phone<b=
r>
&gt; starts sending data to a server, but the server cuts the connection as=
<br>
&gt; it detects the proxy.<br>
&gt;<br>
&gt; So you cannot verify what the smartphone actually sends, you are not i=
n<br>
&gt; control. &quot;Privacy&quot; and end-to-end security require the user =
to be in<br>
&gt; control, so that a server &quot;cannot refuse to serve sensitive conte=
nt over<br>
&gt; a proxied connection&quot; is a good thing, while you list it as a pro=
blem.<br>
&gt; My suggestion was to include a Goal to ensure that users are in contro=
l.<br>
&gt;<br>
<br>
</div></div>_______________________________________________<br>
perpass mailing list<br>
<a href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/perpass" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/perpass</a><br>
</blockquote></div><br></div>

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From: Douglas Otis <doug.mtview@gmail.com>
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Date: Wed, 30 Oct 2013 18:20:02 -0700
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References: <CAO+OM=qyRVgy6qHrmC5uv3BRCGn+f4B9setcKcm+=nhgkVd9wg@mail.gmail.com> <p6cv69lod3c3kdlh0v3mfjo0ic7ta2mrnc@hive.bjoern.hoehrmann.de> <CAO+OM=qEQWrJd=GS1-UUZiDGKzXCdpiqtnZVw5=SEw9oxsJK9Q@mail.gmail.com>
To: Vidya Narayanan <vn@google.com>
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Cc: perpass@ietf.org, Bjoern Hoehrmann <derhoermi@gmx.net>
Subject: Re: [perpass] Explicit proxying in HTTP and making security related decisions from untrustworthy input
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Dear Vidya,

IMHO, the basic problem is making security related decisions using =
untrustworthy input.  Users subjugated to other's DNS and a public CA =
hierarchy are exposed to non-trivial levels of risk.  Joe St Sauver =
offered a pointer to Terry Zink's transitional theory for IPv6 where =
email needs to make rejection decisions at the beginning of an exchange. =
 See:
=
http://blogs.msdn.com/b/tzink/archive/2013/09/11/supporting-email-over-ipv=
6-part-1-an-introduction.aspx

While agreeing fully with Terry's basic assertion about this basic need, =
SMTP lacks expedient methods to confirm source identities such as a =
domain.  He suggests whitelists can be compiled based upon confirmations =
related to DKIM or SPF.  Ironically, DKIM does not validate domains =
initiating an exchange, and SPF depends upon a macro language able to =
cause hundreds of DNS transactions based on highly variable message =
elements with potentially nefarious aim.  Decisions based on =
untrustworthy input while using dangerous protocols makes it absurd to =
suggest other approaches come any where close to offering the same level =
of risk!

Generating a whitelist using untrustworthy input is doomed to confront =
the age old problem of garbage-in garbage-out.  If you configure your =
browser to require valid certificates and find you are able to access =
your bank, one might hope a proxy modified transaction could not be =
completed.  Unfortunately, that is not always the case.  L2TP/IPsec =
http://tools.ietf.org/html/rfc3193 connecting to a known safe =
environment seems like a better solution.  When this type of VPN is =
blocked, the user should not have an expectation of privacy.  It would =
have been nice to find this protocol not borked by an OS update. :^(

Regards,
Douglas Otis


On Oct 30, 2013, at 11:09 AM, Vidya Narayanan <vn@google.com> wrote:

> Hi,
> I may be missing something here, but your wording seems to suggest =
that the user may not trust the server?  If so, that is definitely not =
the targeted case under discussion.  The assumption here is that the =
client (and hence the user) and the server trust each other, but they =
don't necessarily trust all middleboxes.=20
>=20
> If I have not understood you correctly, please let me know.=20
>=20
> Regards,
> Vidya=20
>=20
>=20
> On Tue, Oct 29, 2013 at 6:51 AM, Bjoern Hoehrmann <derhoermi@gmx.net> =
wrote:
> * Vidya Narayanan wrote:
> >All,
> >http://tools.ietf.org/id/draft-vidya-httpbis-explicit-proxy-ps-00.txt =
is a
> >problem statement on the need for explicit proxying in HTTP.
>=20
> I have a suggestion. =46rom the document:
>=20
>    The use of proxies leads to a number of privacy issues.  To
>    summarize:
>=20
>    ...
>=20
>    o  The server has no knowledge of the presence of the proxy and
>       hence, cannot refuse to serve sensitive content over a proxied
>       connection.
>=20
>    o  The weakened security model, when certificate pinning is =
disabled
>       at a general level, allows inspection of content ...
>=20
>    ...
>=20
>    With privacy becoming more and more important, it is important for =
us
>    to support solutions that allow awareness of a privacy breach to =
both
>    users and the servers, when that happens.  To this effect, it is
>    important that proxies be explicitly supported and detected.
>=20
>    ...
>=20
>    o  Content providers may not wish to serve certain content in
>       anything less than an end-to-end secure fashion.
>=20
> How about including in the Goals section that users must be able to
> verify the behavior of untrusted user agents without interference on
> part of the server, which requires the user being able to inspect any
> content without the server knowing, possibly by use of a proxy?
>=20
> I also note that allowing servers to be aware when my "privacy" has
> been "breached" in all likelyhood makes that breach worse, not better.
> --
> Bj=F6rn H=F6hrmann =B7 mailto:bjoern@hoehrmann.de =B7 =
http://bjoern.hoehrmann.de
> Am Badedeich 7 =B7 Telefon: +49(0)160/4415681 =B7 =
http://www.bjoernsworld.de
> 25899 Dageb=FCll =B7 PGP Pub. KeyID: 0xA4357E78 =B7 =
http://www.websitedev.de/
>=20
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


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Content-Transfer-Encoding: quoted-printable
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	charset=iso-8859-1

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Diso-8859-1"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear =
Vidya,<div><br></div><div>IMHO, the basic problem is&nbsp;making =
security related decisions using untrustworthy input. &nbsp;Users =
subjugated to other's DNS and a public CA hierarchy are exposed to =
non-trivial levels of risk. &nbsp;Joe St Sauver offered a pointer to =
Terry Zink's transitional theory for IPv6 where email needs to make =
rejection decisions at the beginning of an exchange. =
&nbsp;See:</div><div><a =
href=3D"http://blogs.msdn.com/b/tzink/archive/2013/09/11/supporting-email-=
over-ipv6-part-1-an-introduction.aspx">http://blogs.msdn.com/b/tzink/archi=
ve/2013/09/11/supporting-email-over-ipv6-part-1-an-introduction.aspx</a></=
div><div><br></div><div>While agreeing fully with Terry's basic =
assertion about this basic need, SMTP lacks expedient methods to confirm =
source identities such as a domain. &nbsp;He suggests whitelists can be =
compiled based upon confirmations related to DKIM or SPF. =
&nbsp;Ironically, DKIM does not validate domains initiating an exchange, =
and SPF depends upon a macro language able to cause hundreds of DNS =
transactions based on highly variable message elements with potentially =
nefarious aim. &nbsp;Decisions based on untrustworthy input while using =
dangerous protocols makes it absurd to suggest other approaches come any =
where close to offering the same level of =
risk!</div><div><br></div><div>Generating a whitelist using =
untrustworthy input is doomed to confront the age old problem of =
garbage-in garbage-out. &nbsp;If you configure your browser to require =
valid certificates and find you are able to access your bank, one might =
hope a proxy modified transaction could not be completed. =
&nbsp;Unfortunately, that is not always the case. =
&nbsp;L2TP/IPsec&nbsp;<a =
href=3D"http://tools.ietf.org/html/rfc3193">http://tools.ietf.org/html/rfc=
3193</a>&nbsp;connecting to a known safe environment seems like a better =
solution. &nbsp;When this type of VPN is blocked, the user should not =
have an expectation of privacy. &nbsp;It would have been nice to find =
this protocol not borked by an OS update. =
:^(</div><div><br></div><div>Regards,</div><div>Douglas =
Otis</div><div><br></div><div><br><div><div>On Oct 30, 2013, at 11:09 =
AM, Vidya Narayanan &lt;<a =
href=3D"mailto:vn@google.com">vn@google.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><div =
dir=3D"ltr">Hi,<div>I may be missing something here, but your wording =
seems to suggest that the user may not trust the server? &nbsp;If so, =
that is definitely not the targeted case under discussion. &nbsp;The =
assumption here is that the client (and hence the user) and the server =
trust each other, but they don't necessarily trust all =
middleboxes.&nbsp;</div>
<div><br></div><div>If I have not understood you correctly, please let =
me =
know.&nbsp;</div><div><br></div><div>Regards,<br>Vidya&nbsp;</div></div><d=
iv class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Tue, Oct =
29, 2013 at 6:51 AM, Bjoern Hoehrmann <span dir=3D"ltr">&lt;<a =
href=3D"mailto:derhoermi@gmx.net" =
target=3D"_blank">derhoermi@gmx.net</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div class=3D"im">* =
Vidya Narayanan wrote:<br>
&gt;All,<br>
&gt;<a =
href=3D"http://tools.ietf.org/id/draft-vidya-httpbis-explicit-proxy-ps-00.=
txt" =
target=3D"_blank">http://tools.ietf.org/id/draft-vidya-httpbis-explicit-pr=
oxy-ps-00.txt</a> is a<br>
&gt;problem statement on the need for explicit proxying in HTTP.<br>
<br>
</div>I have a suggestion. =46rom the document:<br>
<br>
&nbsp; &nbsp;The use of proxies leads to a number of privacy issues. =
&nbsp;To<br>
&nbsp; &nbsp;summarize:<br>
<br>
&nbsp; &nbsp;...<br>
<br>
&nbsp; &nbsp;o &nbsp;The server has no knowledge of the presence of the =
proxy and<br>
&nbsp; &nbsp; &nbsp; hence, cannot refuse to serve sensitive content =
over a proxied<br>
&nbsp; &nbsp; &nbsp; connection.<br>
<br>
&nbsp; &nbsp;o &nbsp;The weakened security model, when certificate =
pinning is disabled<br>
&nbsp; &nbsp; &nbsp; at a general level, allows inspection of content =
...<br>
<br>
&nbsp; &nbsp;...<br>
<br>
&nbsp; &nbsp;With privacy becoming more and more important, it is =
important for us<br>
&nbsp; &nbsp;to support solutions that allow awareness of a privacy =
breach to both<br>
&nbsp; &nbsp;users and the servers, when that happens. &nbsp;To this =
effect, it is<br>
&nbsp; &nbsp;important that proxies be explicitly supported and =
detected.<br>
<br>
&nbsp; &nbsp;...<br>
<br>
&nbsp; &nbsp;o &nbsp;Content providers may not wish to serve certain =
content in<br>
&nbsp; &nbsp; &nbsp; anything less than an end-to-end secure =
fashion.<br>
<br>
How about including in the Goals section that users must be able to<br>
verify the behavior of untrusted user agents without interference on<br>
part of the server, which requires the user being able to inspect =
any<br>
content without the server knowing, possibly by use of a proxy?<br>
<br>
I also note that allowing servers to be aware when my "privacy" has<br>
been "breached" in all likelyhood makes that breach worse, not =
better.<br>
<span class=3D"HOEnZb"><font color=3D"#888888">--<br>
Bj=F6rn H=F6hrmann =B7 mailto:<a =
href=3D"mailto:bjoern@hoehrmann.de">bjoern@hoehrmann.de</a> =B7 <a =
href=3D"http://bjoern.hoehrmann.de/" =
target=3D"_blank">http://bjoern.hoehrmann.de</a><br>
Am Badedeich 7 =B7 Telefon: <a href=3D"tel:%2B49%280%29160%2F4415681" =
value=3D"+491604415681">+49(0)160/4415681</a> =B7 <a =
href=3D"http://www.bjoernsworld.de/" =
target=3D"_blank">http://www.bjoernsworld.de</a><br>
25899 Dageb=FCll =B7 PGP Pub. KeyID: 0xA4357E78 =B7 <a =
href=3D"http://www.websitedev.de/" =
target=3D"_blank">http://www.websitedev.de/</a><br>
</font></span></blockquote></div><br></div>
_______________________________________________<br>perpass mailing =
list<br><a =
href=3D"mailto:perpass@ietf.org">perpass@ietf.org</a><br>https://www.ietf.=
org/mailman/listinfo/perpass<br></blockquote></div><br></div></body></html=
>=

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From: "Eggert, Lars" <lars@netapp.com>
To: perpass <perpass@ietf.org>
Thread-Topic: perpass-related talk at IRTF Open Meeting at	IETF-88
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Potentially of interest: Nick Feamster's talk

Begin forwarded message:

> From: "Eggert, Lars" <lars@netapp.com>
> Subject: [IRTF-Announce] Preliminary agenda for the IRTF Open Meeting =
at IETF-88
> Date: October 31, 2013 17:53:15 GMT+08:00
> To: "irtf-discuss@irtf.org" <irtf-discuss@irtf.org>, =
"irtf-announce@irtf.org" <irtf-announce@irtf.org>
> Reply-To: "irtf-discuss@irtf.org" <irtf-discuss@irtf.org>
>=20
> A preliminary agenda for the IRTF Open Meeting at IETF-88 is now =
online: https://www.ietf.org/proceedings/88/agenda/agenda-88-irtfopen
>=20
> Lars
>=20
> --
>=20
> Agenda
> IRTF Open Meeting @ IETF-88
> Vancouver, Canada
> 1420-1550 PST
> Tuesday Afternoon Session II
>=20
> [Slot lengths below indicate presentation+discussion time.]
>=20
>=20
> State of the IRTF
>    Lars Eggert
>    5+5 min
>=20
>=20
> Measuring and Circumventing Internet Censorship and Control
>    Nick Feamster
>    25+5 min
> =09
> =09
> Applied Networking Prize (ANRP) Award Talk
>    30+10 min
>=20
>    *** IDILIO DRAGO *** for characterizing traffic and workloads of =
the
>    Dropbox cloud storage system:
>=20
>    Idilio Drago, Marco Mellia, Maurizio M. Munafo, Anna Sperotto,
>    Ramin Sadre and Aiko Pras. Inside Dropbox: Understanding Personal
>    Cloud Storage Services. Proc. ACM Internet Measurement Conference
>    (IMC), November 2012, Boston, MA, USA.
>=20
>=20
> Internet Research Grand Challenges
>    Eliot Lear
>    10 min
>=20


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From lear@cisco.com  Thu Oct 31 04:07:44 2013
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Subject: Re: [perpass] Explicit proxying in HTTP
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Vidya,

On 10/30/13 10:47 PM, Vidya Narayanan wrote:

>
> This document covers the case where a client and server wish to
> exchange traffic over a channel that is either end-to-end secure or is
> point-to-point secured to an authorized middle box. The threats it
> addresses are those due to unauthorized middle boxes and provides
> guidelines and goals to make those detectable by the endpoints,
> including the user.

Who gets to do the authorizing?  Does the infrastructure owner get a say
how her infrastructure is used?  But before we go too far, where should
this discussion really take place?  Here or in httpbis?

Eliot

From stephen.farrell@cs.tcd.ie  Thu Oct 31 04:27:45 2013
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On 10/31/2013 11:07 AM, Eliot Lear wrote:
> But before we go too far, where should
> this discussion really take place?  Here or in httpbis?

Good question.

My take: in httpbis - its on their agenda for next week I
think, and its their problem and afaik people are actively
interested in addressing it there.

It is a hard-ish problem and it could be the case that there's
stuff that'll be relevant for this list, but I think that
only makes sense after something has taken shape in httpbis
and maybe not then if they do a good enough job, which I
hope they will.

So yeah, better for this discussion to happen on the httpbis
list please.

Thanks,
S.

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Subject: Re: [perpass] Traffic analysis
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Hi Rich,

You've hit several nails on the head here as to
why the premises for the list are so flawed.

Privacy (as opposed to PPII) is a legal,
societal, and religious matter, yet it is never
defined, and assumed by the proponents of
the list as accepted as an absolute tenet.  So
what if one is not of that religious persuasion?
What if you don't want to pay the broad array
of significant real costs and elevated threats
to finance those religious beliefs?  for example,
there are no use cases of where any form of
pervasive monitoring has brought down a plane.

Similarly neither "pervasive" nor "monitoring"
nor the concatenation of the two are defined
or even explained.

All of this is highly context dependent - as you
and others have repeatedly pointed out, and even
Stephen admits - raising the specter of bad actors.
Gee, not much new there.  However, the group
seemed to have been spun up over good actors
doing serious jobs, not bad ones.  That's ironic.
In fact, the proffered use cases seem directed
at impeding good actors and potentially seriously
damaging good actor requirements.

This is one of the worst examples of IETF upper
layer excesses witnessed over many decades.
While it can be written off as a canard to keep
some religious persuasions happy, it does real
harm to the IETF's stature.  This stuff belongs on
K-street and other lobbying venues, not in a
serious technical body that needs to accommodate
a broad spectrum of perspectives and needs.

--tony



On 10/30/2013 11:36 AM, Richard Shockey wrote:
> [RS> ] Who's privacy? The calling party or the called party.   This is my
> point. Enabling privacy for one may violate the privacy of the other. Now we
> are really blasting past Layer 8-10 Economic Political and Religious into
> Layer 11 Philosophy.   I'm totally incompetent to make judgments on that
> Layer.


From hannes.tschofenig@gmx.net  Thu Oct 31 08:17:32 2013
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Subject: Re: [perpass] Traffic analysis
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Guys, have a look at the lovely privacy consideration document the IAB 
published not too long ago. It explains you how we see privacy (which is 
different to what other people consider under privacy). It turns out 
that is exactly the approach we have taken with security many years ago.

Just compare it with security and you will for sure understand that the 
decision making process about how to design a system isn't entirely 
without judgement about what threats you care about and what security 
solutions you are willing to put in place. Most of the decisions are 
about tradeoffs.

The same is true for privacy.

I don't like this "we cannot define it precisely and so we shouldn't do 
anything about it" attitude.

Just pushing responsibilities to other communities does not help make 
progress. For this reason I have written https://goo.gl/a35BY2, which 
explains in what areas challenges exist.

Ciao
Hannes

Am 31.10.13 16:05, schrieb Tony Rutkowski:
> Hi Rich,
>
> You've hit several nails on the head here as to
> why the premises for the list are so flawed.
>
> Privacy (as opposed to PPII) is a legal,
> societal, and religious matter, yet it is never
> defined, and assumed by the proponents of
> the list as accepted as an absolute tenet.  So
> what if one is not of that religious persuasion?
> What if you don't want to pay the broad array
> of significant real costs and elevated threats
> to finance those religious beliefs?  for example,
> there are no use cases of where any form of
> pervasive monitoring has brought down a plane.
>
> Similarly neither "pervasive" nor "monitoring"
> nor the concatenation of the two are defined
> or even explained.
>
> All of this is highly context dependent - as you
> and others have repeatedly pointed out, and even
> Stephen admits - raising the specter of bad actors.
> Gee, not much new there.  However, the group
> seemed to have been spun up over good actors
> doing serious jobs, not bad ones.  That's ironic.
> In fact, the proffered use cases seem directed
> at impeding good actors and potentially seriously
> damaging good actor requirements.
>
> This is one of the worst examples of IETF upper
> layer excesses witnessed over many decades.
> While it can be written off as a canard to keep
> some religious persuasions happy, it does real
> harm to the IETF's stature.  This stuff belongs on
> K-street and other lobbying venues, not in a
> serious technical body that needs to accommodate
> a broad spectrum of perspectives and needs.
>
> --tony
>
>
>
> On 10/30/2013 11:36 AM, Richard Shockey wrote:
>> [RS> ] Who's privacy? The calling party or the called party.   This is my
>> point. Enabling privacy for one may violate the privacy of the other.
>> Now we
>> are really blasting past Layer 8-10 Economic Political and Religious into
>> Layer 11 Philosophy.   I'm totally incompetent to make judgments on that
>> Layer.
>
> _______________________________________________
> perpass mailing list
> perpass@ietf.org
> https://www.ietf.org/mailman/listinfo/perpass


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Cc: perpass@ietf.org, 'Stephen Farrell' <stephen.farrell@cs.tcd.ie>, Richard Shockey <richard@shockey.us>
Subject: Re: [perpass] Traffic analysis
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Hi Hannes,

The issue is not that privacy cannot be defined
It is that the concept of privacy and its import
varies widely in different societies, legal systems,
and people.   So why would a broad-based technical
technical body even deal with the topic.

As to your ID and its premises, it isn't exactly
accurate.  What is today regarded as the Internet
was run on DOD infrastructure.  The DARPA
Director who signed off on its pursuit in the 70s
recently testified that he had sufficient concerns
about its security that he directed the NSA to
become involved.  Until the mid-90s, most of
the traffic was pervasively monitored by the USG
and contractors.  Nothing new there, early commercial
Internet providers in the 1990s mined the data for
network management and commercial sales purposes.
In a best-effort, connectionless infrastructure, pervasive
monitoring is not unimportant.

That same DARPA director in the 1990s lead teams
to deal with what was expected to be significant misuse
of the infrastructure and protocols as the technology
replaced traditional - much more tightly controlled
and "surveilled" telecommunication infrastructure.
The Cybercrime Convention and other legal instruments
and requirements were developed because pervasive
monitoring was essential.  The likelihood of terrorists
pulling off something like a 9/11 via the Internet
was the subject of serious concern in the late 90s.
All the European bombings after that, made pervasive
monitoring so important, the EU adopted its directive
for the capture and storage of all meta data.

I could go on, but if you're serious about network
security, might I suggest engagement with any of the
numerous NIST and other governmental efforts
occurring around the world.  It's not just the IETF,
and if religious security and K-street lobbying
become the IETF's forté, the organization is only
harming itself.

--tony



On 10/31/2013 11:17 AM, Hannes Tschofenig wrote:
> The same is true for privacy.
>
> I don't like this "we cannot define it precisely and so we shouldn't 
> do anything about it" attitude.
>
> Just pushing responsibilities to other communities does not help make 
> progress. For this reason I have written https://goo.gl/a35BY2, which 
> explains in what areas challenges exist.


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--001a11c207f020905004ea0bc2d3
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On Thu, Oct 31, 2013 at 11:45 AM, Tony Rutkowski
<rutkowski.tony@gmail.com>wrote:

> The issue is not that privacy cannot be defined
> It is that the concept of privacy and its import
> varies widely in different societies, legal systems,
> and people.   So why would a broad-based technical
> technical body even deal with the topic.
>

IMHO you're at the wrong level, and the concept of privacy as used here is
abstract enough to be universal. What varies among cultures is what's kept
private, and how it is kept private - the instantiation of the concept.

--001a11c207f020905004ea0bc2d3
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Thu, Oct 31, 2013 at 11:45 AM, Tony Rutkowski <span dir=3D"ltr">&lt;<a h=
ref=3D"mailto:rutkowski.tony@gmail.com" target=3D"_blank">rutkowski.tony@gm=
ail.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div id=3D":1n0" style=3D"overflow:hidden">T=
he issue is not that privacy cannot be defined<br>
It is that the concept of privacy and its import<br>
varies widely in different societies, legal systems,<br>
and people. =A0 So why would a broad-based technical<br>
technical body even deal with the topic.</div></blockquote></div><br>IMHO y=
ou&#39;re at the wrong level, and the concept of privacy as used here is ab=
stract enough to be universal. What varies among cultures is what&#39;s kep=
t private, and how it is kept private - the instantiation of the concept.</=
div>

</div>

--001a11c207f020905004ea0bc2d3--

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Abstract enough to be universal?
That sure encompasses a universe
of things.  Seems like a perfect
definition of religious beliefs.

You also ignore other very significant
components like how much it costs,
the impact on performance and innovation,
and how individuals feel (or not) about
the matter.  If someone wants to opt for
zero or diminished privacy - even if that
turkey can be stuffed with some technical
capability - in exchange for other benefits,
they should have the choice.

Most global technical bodies eschew
this subject.

--tony


On 10/31/2013 12:15 PM, Scott Brim wrote:
> IMHO you're at the wrong level, and the concept of privacy as used 
> here is abstract enough to be universal. What varies among cultures is 
> what's kept private, and how it is kept private - the instantiation of 
> the concept.


From tbray@textuality.com  Thu Oct 31 09:44:04 2013
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--089e013cbc10a53dc604ea0c276a
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Pardon the interruption, but this conversation could use a smile:
http://teespring.com/nsassl

--089e013cbc10a53dc604ea0c276a
Content-Type: text/html; charset=UTF-8

<div dir="ltr">Pardon the interruption, but this conversation could use a smile: <a href="http://teespring.com/nsassl">http://teespring.com/nsassl</a><br></div>

--089e013cbc10a53dc604ea0c276a--

From fergdawgster@mykolab.com  Thu Oct 31 09:49:34 2013
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On 10/31/2013 9:43 AM, Tim Bray wrote:

> Pardon the interruption, but this conversation could use a smile:
> http://teespring.com/nsassl
>

I know it's off-topic, but I love it. Just the right amount of snark. ;-)

- ferg


-- 
Paul Ferguson
Vice President, Threat Intelligence
Internet Identity, Tacoma, Washington  USA
IID --> "Connect and Collaborate" --> www.internetidentity.com

From dhc@dcrocker.net  Thu Oct 31 09:54:05 2013
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On 10/31/2013 9:15 AM, Scott Brim wrote:
>
> IMHO you're at the wrong level, and the concept of privacy as used here
> is abstract enough to be universal. What varies among cultures is what's
> kept private, and how it is kept private - the instantiation of the concept.



Hmmm.  That sounds suspiciously like the difference between mechanism 
and policy, with the requirement in the IETF to be one of defining 
mechanisms, while leaving policies for their application to others, 
outside of the IETF.

No wonder this limitation of scope is being criticized so vigorously -- 
one might even say religiously.  After all, it's not as if we've used 
that distinction much in the past, or with any real success...

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1



> the matter.  If someone wants to opt for zero or diminished privacy
> - even if that turkey can be stuffed with some technical capability
> - in exchange for other benefits, they should have the choice.

Conversely, if someone desires the maximum possible privacy, they
should also have that choice. If the system by it's design prevents
that choice, then those users that desire that measure of privacy are
pushed out.

- --
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From rutkowski.tony@gmail.com  Thu Oct 31 10:35:58 2013
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Subject: Re: [perpass] Traffic analysis
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Not sure where the "someone demands the maximum"
paradigm gets us.

It generally comes down to three factors:

1. what is mandated by governments
2. what providers implement
3. what the marketplace chooses

By the way, the same emeritus DARPA
Director recently opined, if you are really
concerned about surveillance or security,
don't connect to a network.  It is why NIST
and new security ecosystem has largely
shifted to a risk management approach.

If the IETF wants to do something meaningful
here, generate some templates under SP800-53 R4,

--tony


On 10/31/2013 12:55 PM, d.nix wrote:
> Conversely, if someone desires the maximum possible privacy, they
> should also have that choice. If the system by it's design prevents
> that choice, then those users that desire that measure of privacy are
> pushed out.


From dhc@dcrocker.net  Thu Oct 31 10:44:55 2013
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Subject: Re: [perpass] A little levity
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On 10/31/2013 9:43 AM, Tim Bray wrote:
> Pardon the interruption, but this conversation could use a smile:
> http://teespring.com/nsassl


So, whoever is wearing the t-shirt represents a single point of failure 
for end-to-end encryption?

d/


-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

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From: Scott Brim <scott.brim@gmail.com>
Date: Thu, 31 Oct 2013 14:18:04 -0400
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To: Tony Rutkowski <rutkowski.tony@gmail.com>
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Subject: Re: [perpass] Traffic analysis
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On Thu, Oct 31, 2013 at 1:35 PM, Tony Rutkowski <rutkowski.tony@gmail.com>wrote:

> Not sure where the "someone demands the maximum"
> paradigm gets us.
>

It gets us to protocol and system design principles.


>
> It generally comes down to three factors:
>
> 1. what is mandated by governments
> 2. what providers implement
> 3. what the marketplace chooses
>

You left out: what is possible in the protocol system provided to the
implementors.  There are issues with protocols, new and old, that are being
looked at right now in order to improve the _possibility_ of privacy.  This
is something the IETF can be very good at: creating/guiding the scope over
which the three rather generalized "factors" you mention can range.

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On T=
hu, Oct 31, 2013 at 1:35 PM, Tony Rutkowski <span dir=3D"ltr">&lt;<a href=
=3D"mailto:rutkowski.tony@gmail.com" target=3D"_blank">rutkowski.tony@gmail=
.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Not sure where the &quot;someone demands the=
 maximum&quot;<br>
paradigm gets us.<br></blockquote><div><br></div><div>It gets us to protoco=
l and system design principles.</div><div>=A0</div><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">


<br>
It generally comes down to three factors:<br>
<br>
1. what is mandated by governments<br>
2. what providers implement<br>
3. what the marketplace chooses<br></blockquote><div><br></div><div>You lef=
t out: what is possible in the protocol system provided to the implementors=
. =A0There are issues with protocols, new and old, that are being looked at=
 right now in order to improve the _possibility_ of privacy. =A0This is som=
ething the IETF can be very good at: creating/guiding the scope over which =
the three rather generalized &quot;factors&quot; you mention can range.</di=
v>

<div>=A0</div></div></div></div>

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From: Tony Rutkowski <rutkowski.tony@gmail.com>
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References: <13102810494583_8A24@oregon.uoregon.edu> <01P04ABSOR0E00004R@mauve.mrochek.com> <01e901ced4ef$f3615e80$da241b80$@shockey.us> <52703B74.4090409@cs.tcd.ie> <00f801ced585$bd7d3870$3877a950$@shockey.us> <527271CD.8000005@gmail.com> <52727480.4000202@gmx.net> <52727B0D.6030801@gmail.com> <CAPv4CP9V7-=kmv0KwuM0RR1b67Ng0uBMddf+MxLLf1dXJSThzA@mail.gmail.com> <527286EC.7000504@gmail.com> <52728B7F.3080008@comcast.net> <527294ED.2040207@gmail.com> <CAPv4CP86ro158RLMn02yLh0yrOVxwdZM4SVOonBjZZY80nXWcQ@mail.gmail.com>
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Good.  This is not unlike the NIST SP800-53r4 approach
which is the foundational U.S. (and probably CCRA)
network security approach.

--tony

On 10/31/2013 2:18 PM, Scott Brim wrote:
> You left out: what is possible in the protocol system provided to the 
> implementors.  There are issues with protocols, new and old, that are 
> being looked at right now in order to improve the _possibility_ of 
> privacy.  This is something the IETF can be very good at: 
> creating/guiding the scope over which the three rather generalized 
> "factors" you mention can range.


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Martin Thomson will be giving a short talk about location services and =
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17:30-18:30: <https://datatracker.ietf.org/meeting/88/agenda/geopriv/>.

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On Oct 31, 2013 5:04 PM, "Alissa Cooper" <acooper@cdt.org> wrote:
>
> Martin Thomson will be giving a short talk about location services and
surveillance at the end of the GEOPRIV session on Thursday, November 7,
17:30-18:30: <https://datatracker.ietf.org/meeting/88/agenda/geopriv/>.

They've been trying for years to refine trade offs between location and
privacy.  This should be interesting.  I hope he can distill out some
principles that can be used in other WGs.

Scott

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<p dir=3D"ltr"><br>
On Oct 31, 2013 5:04 PM, &quot;Alissa Cooper&quot; &lt;<a href=3D"mailto:ac=
ooper@cdt.org">acooper@cdt.org</a>&gt; wrote:<br>
&gt;<br>
&gt; Martin Thomson will be giving a short talk about location services and=
 surveillance at the end of the GEOPRIV session on Thursday, November 7, 17=
:30-18:30: &lt;<a href=3D"https://datatracker.ietf.org/meeting/88/agenda/ge=
opriv/">https://datatracker.ietf.org/meeting/88/agenda/geopriv/</a>&gt;.</p=
>

<p dir=3D"ltr">They&#39;ve been trying for years to refine trade offs betwe=
en location and privacy.=A0 This should be interesting.=A0 I hope he can di=
still out some principles that can be used in other WGs.=A0 </p>
<p dir=3D"ltr">Scott </p>

--001a11c30186b441c304ea10d7b9--

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--001a11c2c124e919a904ea170a62
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All,
Thanks - I should have mentioned that the draft was submitted to httpbis (I
thought that was obvious from the naming convention).  It has been sent to
httpbis and as Stephen notes, it is on their agenda.  At this point, this
draft is only an FYI to this list - as there is an intersection in impact,
I had sent it out.

Cheers,
Vidya


On Thu, Oct 31, 2013 at 4:27 AM, Stephen Farrell
<stephen.farrell@cs.tcd.ie>wrote:

>
>
> On 10/31/2013 11:07 AM, Eliot Lear wrote:
> > But before we go too far, where should
> > this discussion really take place?  Here or in httpbis?
>
> Good question.
>
> My take: in httpbis - its on their agenda for next week I
> think, and its their problem and afaik people are actively
> interested in addressing it there.
>
> It is a hard-ish problem and it could be the case that there's
> stuff that'll be relevant for this list, but I think that
> only makes sense after something has taken shape in httpbis
> and maybe not then if they do a good enough job, which I
> hope they will.
>
> So yeah, better for this discussion to happen on the httpbis
> list please.
>
> Thanks,
> S.
>

--001a11c2c124e919a904ea170a62
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">All,<div>Thanks - I should have mentioned that the draft w=
as submitted to httpbis (I thought that was obvious from the naming convent=
ion). =A0It has been sent to httpbis and as Stephen notes, it is on their a=
genda. =A0At this point, this draft is only an FYI to this list - as there =
is an intersection in impact, I had sent it out.=A0</div>
<div><br></div><div>Cheers,</div><div>Vidya=A0</div></div><div class=3D"gma=
il_extra"><br><br><div class=3D"gmail_quote">On Thu, Oct 31, 2013 at 4:27 A=
M, Stephen Farrell <span dir=3D"ltr">&lt;<a href=3D"mailto:stephen.farrell@=
cs.tcd.ie" target=3D"_blank">stephen.farrell@cs.tcd.ie</a>&gt;</span> wrote=
:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im"><br>
<br>
On 10/31/2013 11:07 AM, Eliot Lear wrote:<br>
&gt; But before we go too far, where should<br>
&gt; this discussion really take place? =A0Here or in httpbis?<br>
<br>
</div>Good question.<br>
<br>
My take: in httpbis - its on their agenda for next week I<br>
think, and its their problem and afaik people are actively<br>
interested in addressing it there.<br>
<br>
It is a hard-ish problem and it could be the case that there&#39;s<br>
stuff that&#39;ll be relevant for this list, but I think that<br>
only makes sense after something has taken shape in httpbis<br>
and maybe not then if they do a good enough job, which I<br>
hope they will.<br>
<br>
So yeah, better for this discussion to happen on the httpbis<br>
list please.<br>
<br>
Thanks,<br>
S.<br>
</blockquote></div><br></div>

--001a11c2c124e919a904ea170a62--
