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From: Richard Barnes <rlb@ipv.sx>
Date: Fri, 1 Mar 2019 12:08:42 -0500
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Subject: [Secdispatch] DTLS - EDHOC <= 32
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--000000000000a3aa8505830b7666
Content-Type: text/plain; charset="UTF-8"

Hey folks,

To try to understand the size arguments w.r.t. EDHOC / DTLS, I sat down and
tried to lower-bound the size of the messages in each protocol.  The theory
I'm using here is: The only things that really need to be in these
protocols are the crypto variables.  Everything else is just a matter of
encoding or pre-negotiation.  Under that theory, consider the following
cartoon sketches of the two protocols in the full handshake, mutually
authenticated with asymmetric keys, including minimum sizes in octets
assuming a 128-bit security level:

DTLS 1.3 (mutually authenticated):
1. C->S: DH (32)
2. S->C: DH, PUBKEY, SIG, MAC, TAG (176 = 32 + 32 + 64 + 32 + 16)
3. C->S: PUBKEY, SIG, MAC, TAG (144 = 32 + 64 + 32 + 16)

EDHOC:
1. C->S: DH (32)
2. S->C: DH, PUBKEY, SIG, TAG (144 = 32 + 32 + 64 + 16)
3. C->S: PUBKEY, SIG, TAG (112 = 32 + 64 + 16)

The conclusions I draw from this (assuming the above summary is correct):

1. The size estimates in the EDHOC draft cannot be correct.  On the one
hand, the EDHOC estimates for messages 2 and 3 are all below the above
minimums.  On the other hand, the DTLS size estimates indicate a not very
aggressive optimization, since they are all well above these minimums.

2. The difference between EDHOC and DTLS is at most 32 octets.  Whatever
encoding you adopt for EDHOC, it can be translated to DTLS at a cost of 32
octets.

3. The primary driver of the size difference between EDHOC and DTLS is the
DTLS Finished MAC.

Basically, EDHOC claims they can get away without the Finished MAC because
the correct stuff is covered under the AEAD tag.  However, if this approach
is correct, then you could also "virtualize" the DTLS Finished MAC by
having the peers include it in the AEAD calculation, but strip it from
what's sent on the wire.  In either case, fresh analysis is needed.  But an
analysis of DTLS with a virtualized MAC seems much simpler and more focused
than starting from scratch.

Hope folks find this helpful.

--Richard

--000000000000a3aa8505830b7666
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hey folks,</div><div><br></div><div>To try to underst=
and the size arguments w.r.t. EDHOC / DTLS, I sat down and tried to lower-b=
ound the size of the messages in each protocol.=C2=A0 The theory I&#39;m us=
ing here is: The only things that really need to be in these protocols are =
the crypto variables.=C2=A0 Everything else is just a matter of encoding or=
 pre-negotiation.=C2=A0 Under that theory, consider the following cartoon s=
ketches of the two protocols in the full handshake, mutually authenticated =
with asymmetric keys, including minimum sizes in octets assuming a 128-bit =
security level:<br></div><div><br></div><div>DTLS 1.3 (mutually authenticat=
ed):</div><div>1. C-&gt;S: DH (32)<br></div><div>2. S-&gt;C: DH, PUBKEY, SI=
G, MAC, TAG (176 =3D 32 + 32 + 64 + 32 + 16)<br></div><div>3. C-&gt;S: PUBK=
EY, SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16)</div><div><br></div><div>EDHO=
C:</div><div>1. C-&gt;S: DH (32)<br></div><div>2. S-&gt;C: DH, PUBKEY, SIG,=
 TAG (144 =3D 32 + 32 + 64 + 16)</div><div>3. C-&gt;S: PUBKEY, SIG, TAG (11=
2 =3D 32 + 64 + 16)</div><div><br></div><div>The conclusions I draw from th=
is (assuming the above summary is correct):</div><div><br></div><div>1. The=
 size estimates in the EDHOC draft cannot be correct.=C2=A0 On the one hand=
, the EDHOC estimates for messages 2 and 3 are all below the above minimums=
.=C2=A0 On the other hand, the DTLS size estimates indicate a not very aggr=
essive optimization, since they are all well above these minimums.<br><div>=
<br></div><div>2. The difference between EDHOC and DTLS is at most 32 octet=
s.=C2=A0 Whatever encoding you adopt for EDHOC, it can be=20
translated to DTLS at a cost of 32 octets.<br></div></div><div><br></div><d=
iv>3. The primary driver of the size difference between EDHOC and DTLS is t=
he DTLS Finished MAC.<br></div><div><br></div><div>Basically, EDHOC claims =
they can get away without the Finished MAC because the correct stuff is cov=
ered under the AEAD tag.=C2=A0 However, if this approach is correct, then y=
ou could also &quot;virtualize&quot; the DTLS Finished MAC by having the pe=
ers include it in the AEAD calculation, but strip it from what&#39;s sent o=
n the wire.=C2=A0 In either case, fresh analysis is needed.=C2=A0 But an an=
alysis of DTLS with a virtualized MAC seems much simpler and more focused t=
han starting from scratch.<br></div><div><br></div><div>Hope folks find thi=
s helpful.<br></div><div><br></div><div>--Richard<br></div></div>

--000000000000a3aa8505830b7666--


From nobody Fri Mar  1 13:14:06 2019
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Subject: [Secdispatch] secdispatch - Requested session has been scheduled for IETF 104
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Dear Roman Danyliw,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    secdispatch Session 1 (2:00 requested)
    Monday, 25 March 2019, Afternoon Session I 1350-1550
    Room Name: Congress Hall 3 size: 250
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/104/sessions/secdispatch.ics

Request Information:


---------------------------------------------------------
Working Group Name: Security Dispatch
Area Name: Security Area
Session Requester: Roman Danyliw

Number of Sessions: 1
Length of Session(s):  2 Hours
Number of Attendees: 100
Conflicts to Avoid: 
 First Priority: dispatch ace dots perc acme mls saag
 Second Priority: tls mile



People who must be present:
  Eric Rescorla
  Roman Danyliw
  Richard Barnes
  Benjamin Kaduk

Resources Requested:

Special Requests:
  Ideally this session wouldn&#39;t conflict with any security area meetings; and would be early in the week. Previous Monday or Tuesday slots worked well.
---------------------------------------------------------


From nobody Fri Mar  1 15:23:50 2019
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From: Jim Schaad <ietf@augustcellars.com>
To: 'Richard Barnes' <rlb@ipv.sx>, <secdispatch@ietf.org>
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Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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------=_NextPart_000_0035_01D4D042.B18E9F00
Content-Type: text/plain; charset="UTF-8"
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Richard,

=20

You incorrectly translated the EDHOC protocol below.

=20

Jim

=20

=20

From: Secdispatch <secdispatch-bounces@ietf.org> On Behalf Of Richard =
Barnes
Sent: Friday, March 1, 2019 9:09 AM
To: secdispatch@ietf.org
Subject: [Secdispatch] DTLS - EDHOC <=3D 32

=20

Hey folks,

=20

To try to understand the size arguments w.r.t. EDHOC / DTLS, I sat down =
and tried to lower-bound the size of the messages in each protocol.  The =
theory I'm using here is: The only things that really need to be in =
these protocols are the crypto variables.  Everything else is just a =
matter of encoding or pre-negotiation.  Under that theory, consider the =
following cartoon sketches of the two protocols in the full handshake, =
mutually authenticated with asymmetric keys, including minimum sizes in =
octets assuming a 128-bit security level:

=20

DTLS 1.3 (mutually authenticated):

1. C->S: DH (32)

2. S->C: DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32 + 64 + 32 + 16)

3. C->S: PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16)

=20

EDHOC:

1. C->S: DH (32)

2. S->C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 + 16)

   2.  S->C: DH, SIG, TAG (112 =3D 32 + 64 + 16)

3. C->S: PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)

    2. C->S: SIG, Tag (80 =3D 64+16)

=20

EDHOC is defined to send a key identifier rather than a key.

=20

The conclusions I draw from this (assuming the above summary is =
correct):

=20

1. The size estimates in the EDHOC draft cannot be correct.  On the one =
hand, the EDHOC estimates for messages 2 and 3 are all below the above =
minimums..  On the other hand, the DTLS size estimates indicate a not =
very aggressive optimization, since they are all well above these =
minimums.

=20

2. The difference between EDHOC and DTLS is at most 32 octets.  Whatever =
encoding you adopt for EDHOC, it can be translated to DTLS at a cost of =
32 octets.  Difference is therefore 64 at most 64 octets based on just =
that data.

=20

3. The primary driver of the size difference between EDHOC and DTLS is =
the DTLS Finished MAC.

=20

Basically, EDHOC claims they can get away without the Finished MAC =
because the correct stuff is covered under the AEAD tag.  However, if =
this approach is correct, then you could also "virtualize" the DTLS =
Finished MAC by having the peers include it in the AEAD calculation, but =
strip it from what's sent on the wire.  In either case, fresh analysis =
is needed.  But an analysis of DTLS with a virtualized MAC seems much =
simpler and more focused than starting from scratch.

=20

Hope folks find this helpful.

=20

--Richard


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US =
link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>Richard,<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>You =
incorrectly translated the EDHOC protocol below.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Jim<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b>From:</b> =
Secdispatch &lt;secdispatch-bounces@ietf.org&gt; <b>On Behalf Of =
</b>Richard Barnes<br><b>Sent:</b> Friday, March 1, 2019 9:09 =
AM<br><b>To:</b> secdispatch@ietf.org<br><b>Subject:</b> [Secdispatch] =
DTLS - EDHOC &lt;=3D 32<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>Hey folks,<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>To try to understand the size arguments w.r.t. EDHOC / =
DTLS, I sat down and tried to lower-bound the size of the messages in =
each protocol.&nbsp; The theory I'm using here is: The only things that =
really need to be in these protocols are the crypto variables.&nbsp; =
Everything else is just a matter of encoding or pre-negotiation.&nbsp; =
Under that theory, consider the following cartoon sketches of the two =
protocols in the full handshake, mutually authenticated with asymmetric =
keys, including minimum sizes in octets assuming a 128-bit security =
level:<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>DTLS 1.3 (mutually =
authenticated):<o:p></o:p></p></div><div><p class=3DMsoNormal>1. =
C-&gt;S: DH (32)<o:p></o:p></p></div><div><p class=3DMsoNormal>2. =
S-&gt;C: DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32 + 64 + 32 + =
16)<o:p></o:p></p></div><div><p class=3DMsoNormal>3. C-&gt;S: PUBKEY, =
SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16)<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>EDHOC:<o:p></o:p></p></div><div><p =
class=3DMsoNormal>1. C-&gt;S: DH (32)<o:p></o:p></p></div><div><p =
class=3DMsoNormal>2. S-&gt;C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 =
+ 16)<o:p></o:p></p><p class=3DMsoNormal>=C2=A0=C2=A0 <span =
style=3D'color:red'>2.=C2=A0 S-&gt;C: DH, SIG, TAG (112 =3D 32 + 64 + =
16)<o:p></o:p></span></p></div><div><p class=3DMsoNormal>3. C-&gt;S: =
PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)<o:p></o:p></p><p =
class=3DMsoNormal>=C2=A0=C2=A0 <span style=3D'color:red'>=C2=A02. =
C-&gt;S: SIG, Tag (80 =3D 64+16)<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:red'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:red'>EDHOC is defined to send a =
key identifier rather than a key.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>The conclusions I draw from this (assuming the above =
summary is correct):<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>1. The size estimates in the EDHOC draft cannot be =
correct.&nbsp; On the one hand, the EDHOC estimates for messages 2 and 3 =
are all below the above minimums..&nbsp; On the other hand, the DTLS =
size estimates indicate a not very aggressive optimization, since they =
are all well above these minimums.<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>2. The difference between EDHOC and DTLS is at most 32 =
octets.&nbsp; Whatever encoding you adopt for EDHOC, it can be =
translated to DTLS at a cost of 32 octets.<span =
style=3D'color:red'>=C2=A0 Difference is therefore 64 at most 64 octets =
based on just that data.<o:p></o:p></span></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>3. The primary driver of the size difference between =
EDHOC and DTLS is the DTLS Finished MAC.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Basically, EDHOC claims they can get away without the =
Finished MAC because the correct stuff is covered under the AEAD =
tag.&nbsp; However, if this approach is correct, then you could also =
&quot;virtualize&quot; the DTLS Finished MAC by having the peers include =
it in the AEAD calculation, but strip it from what's sent on the =
wire.&nbsp; In either case, fresh analysis is needed.&nbsp; But an =
analysis of DTLS with a virtualized MAC seems much simpler and more =
focused than starting from scratch.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Hope folks find this =
helpful.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>--Richard<o:p></o:p></p></div></div></div></div></body>=
</html>
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From: Jim Schaad <ietf@augustcellars.com>
To: 'Richard Barnes' <rlb@ipv.sx>, <secdispatch@ietf.org>
References: <CAL02cgRwgq0BG059N43Z_1OFL+X0K7HYscK2gVp1p3sR7FkcRw@mail.gmail.com> <003401d4d085$bfb03150$3f1093f0$@augustcellars.com>
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Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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I just realized I forgot to include the original 32 bytes =E2=80=93 thus =
we are at 96 bytes smaller.

=20

From: Secdispatch <secdispatch-bounces@ietf.org> On Behalf Of Jim Schaad
Sent: Friday, March 1, 2019 3:23 PM
To: 'Richard Barnes' <rlb@ipv.sx>; secdispatch@ietf.org
Subject: Re: [Secdispatch] DTLS - EDHOC <=3D 32

=20

Richard,

=20

You incorrectly translated the EDHOC protocol below.

=20

Jim

=20

=20

From: Secdispatch <secdispatch-bounces@ietf.org =
<mailto:secdispatch-bounces@ietf.org> > On Behalf Of Richard Barnes
Sent: Friday, March 1, 2019 9:09 AM
To: secdispatch@ietf.org <mailto:secdispatch@ietf.org>=20
Subject: [Secdispatch] DTLS - EDHOC <=3D 32

=20

Hey folks,

=20

To try to understand the size arguments w.r.t. EDHOC / DTLS, I sat down =
and tried to lower-bound the size of the messages in each protocol.  The =
theory I'm using here is: The only things that really need to be in =
these protocols are the crypto variables.  Everything else is just a =
matter of encoding or pre-negotiation.  Under that theory, consider the =
following cartoon sketches of the two protocols in the full handshake, =
mutually authenticated with asymmetric keys, including minimum sizes in =
octets assuming a 128-bit security level:

=20

DTLS 1.3 (mutually authenticated):

1. C->S: DH (32)

2. S->C: DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32 + 64 + 32 + 16)

3. C->S: PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16)

=20

EDHOC:

1. C->S: DH (32)

2. S->C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 + 16)

   2.  S->C: DH, SIG, TAG (112 =3D 32 + 64 + 16)

3. C->S: PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)

    2. C->S: SIG, Tag (80 =3D 64+16)

=20

EDHOC is defined to send a key identifier rather than a key.

=20

The conclusions I draw from this (assuming the above summary is =
correct):

=20

1. The size estimates in the EDHOC draft cannot be correct.  On the one =
hand, the EDHOC estimates for messages 2 and 3 are all below the above =
minimums..  On the other hand, the DTLS size estimates indicate a not =
very aggressive optimization, since they are all well above these =
minimums.

=20

2. The difference between EDHOC and DTLS is at most 32 octets.  Whatever =
encoding you adopt for EDHOC, it can be translated to DTLS at a cost of =
32 octets.  Difference is therefore 64 at most 64 octets based on just =
that data.

=20

3. The primary driver of the size difference between EDHOC and DTLS is =
the DTLS Finished MAC.

=20

Basically, EDHOC claims they can get away without the Finished MAC =
because the correct stuff is covered under the AEAD tag.  However, if =
this approach is correct, then you could also "virtualize" the DTLS =
Finished MAC by having the peers include it in the AEAD calculation, but =
strip it from what's sent on the wire.  In either case, fresh analysis =
is needed.  But an analysis of DTLS with a virtualized MAC seems much =
simpler and more focused than starting from scratch.

=20

Hope folks find this helpful.

=20

--Richard


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US =
link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>I just realized I forgot to include the original 32 =
bytes =E2=80=93 thus we are at 96 bytes smaller.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b>From:</b> =
Secdispatch &lt;secdispatch-bounces@ietf.org&gt; <b>On Behalf Of </b>Jim =
Schaad<br><b>Sent:</b> Friday, March 1, 2019 3:23 PM<br><b>To:</b> =
'Richard Barnes' &lt;rlb@ipv.sx&gt;; =
secdispatch@ietf.org<br><b>Subject:</b> Re: [Secdispatch] DTLS - EDHOC =
&lt;=3D 32<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Richard,<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>You =
incorrectly translated the EDHOC protocol below.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Jim<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b>From:</b> =
Secdispatch &lt;<a =
href=3D"mailto:secdispatch-bounces@ietf.org">secdispatch-bounces@ietf.org=
</a>&gt; <b>On Behalf Of </b>Richard Barnes<br><b>Sent:</b> Friday, =
March 1, 2019 9:09 AM<br><b>To:</b> <a =
href=3D"mailto:secdispatch@ietf.org">secdispatch@ietf.org</a><br><b>Subje=
ct:</b> [Secdispatch] DTLS - EDHOC &lt;=3D =
32<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>Hey folks,<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>To try to understand the size arguments w.r.t. EDHOC / =
DTLS, I sat down and tried to lower-bound the size of the messages in =
each protocol.&nbsp; The theory I'm using here is: The only things that =
really need to be in these protocols are the crypto variables.&nbsp; =
Everything else is just a matter of encoding or pre-negotiation.&nbsp; =
Under that theory, consider the following cartoon sketches of the two =
protocols in the full handshake, mutually authenticated with asymmetric =
keys, including minimum sizes in octets assuming a 128-bit security =
level:<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>DTLS 1.3 (mutually =
authenticated):<o:p></o:p></p></div><div><p class=3DMsoNormal>1. =
C-&gt;S: DH (32)<o:p></o:p></p></div><div><p class=3DMsoNormal>2. =
S-&gt;C: DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32 + 64 + 32 + =
16)<o:p></o:p></p></div><div><p class=3DMsoNormal>3. C-&gt;S: PUBKEY, =
SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16)<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>EDHOC:<o:p></o:p></p></div><div><p =
class=3DMsoNormal>1. C-&gt;S: DH (32)<o:p></o:p></p></div><div><p =
class=3DMsoNormal>2. S-&gt;C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 =
+ 16)<o:p></o:p></p><p class=3DMsoNormal>&nbsp;&nbsp; <span =
style=3D'color:red'>2.&nbsp; S-&gt;C: DH, SIG, TAG (112 =3D 32 + 64 + =
16)<o:p></o:p></span></p></div><div><p class=3DMsoNormal>3. C-&gt;S: =
PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;&nbsp; <span style=3D'color:red'>&nbsp;2. =
C-&gt;S: SIG, Tag (80 =3D 64+16)<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:red'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:red'>EDHOC is defined to send a =
key identifier rather than a key.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>The conclusions I draw from this (assuming the above =
summary is correct):<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>1. The size estimates in the EDHOC draft cannot be =
correct.&nbsp; On the one hand, the EDHOC estimates for messages 2 and 3 =
are all below the above minimums..&nbsp; On the other hand, the DTLS =
size estimates indicate a not very aggressive optimization, since they =
are all well above these minimums.<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>2. The difference between EDHOC and DTLS is at most 32 =
octets.&nbsp; Whatever encoding you adopt for EDHOC, it can be =
translated to DTLS at a cost of 32 octets.<span =
style=3D'color:red'>&nbsp; Difference is therefore 64 at most 64 octets =
based on just that data.<o:p></o:p></span></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>3. The primary driver of the size difference between =
EDHOC and DTLS is the DTLS Finished MAC.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Basically, EDHOC claims they can get away without the =
Finished MAC because the correct stuff is covered under the AEAD =
tag.&nbsp; However, if this approach is correct, then you could also =
&quot;virtualize&quot; the DTLS Finished MAC by having the peers include =
it in the AEAD calculation, but strip it from what's sent on the =
wire.&nbsp; In either case, fresh analysis is needed.&nbsp; But an =
analysis of DTLS with a virtualized MAC seems much simpler and more =
focused than starting from scratch.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Hope folks find this =
helpful.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>--Richard<o:p></o:p></p></div></div></div></div></div><=
/body></html>
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From: Richard Barnes <rlb@ipv.sx>
Date: Fri, 1 Mar 2019 23:13:08 -0500
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Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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Fair point, Jim, but I don't think it actually matters -- you could just as
well add key IDs to TLS, e.g., as a new certificate type (cf. RFC 7250).
So subtract the 32 bytes of PUBKEY from all accounts, and we're still at 32
bytes/message of difference.

--Richard

On Fri, Mar 1, 2019 at 6:23 PM Jim Schaad <ietf@augustcellars.com> wrote:

> Richard,
>
>
>
> You incorrectly translated the EDHOC protocol below.
>
>
>
> Jim
>
>
>
>
>
> *From:* Secdispatch <secdispatch-bounces@ietf.org> *On Behalf Of *Richard
> Barnes
> *Sent:* Friday, March 1, 2019 9:09 AM
> *To:* secdispatch@ietf.org
> *Subject:* [Secdispatch] DTLS - EDHOC <= 32
>
>
>
> Hey folks,
>
>
>
> To try to understand the size arguments w.r.t. EDHOC / DTLS, I sat down
> and tried to lower-bound the size of the messages in each protocol.  The
> theory I'm using here is: The only things that really need to be in these
> protocols are the crypto variables.  Everything else is just a matter of
> encoding or pre-negotiation.  Under that theory, consider the following
> cartoon sketches of the two protocols in the full handshake, mutually
> authenticated with asymmetric keys, including minimum sizes in octets
> assuming a 128-bit security level:
>
>
>
> DTLS 1.3 (mutually authenticated):
>
> 1. C->S: DH (32)
>
> 2. S->C: DH, PUBKEY, SIG, MAC, TAG (176 = 32 + 32 + 64 + 32 + 16)
>
> 3. C->S: PUBKEY, SIG, MAC, TAG (144 = 32 + 64 + 32 + 16)
>
>
>
> EDHOC:
>
> 1. C->S: DH (32)
>
> 2. S->C: DH, PUBKEY, SIG, TAG (144 = 32 + 32 + 64 + 16)
>
>    2.  S->C: DH, SIG, TAG (112 = 32 + 64 + 16)
>
> 3. C->S: PUBKEY, SIG, TAG (112 = 32 + 64 + 16)
>
>     2. C->S: SIG, Tag (80 = 64+16)
>
>
>
> EDHOC is defined to send a key identifier rather than a key.
>
>
>
> The conclusions I draw from this (assuming the above summary is correct):
>
>
>
> 1. The size estimates in the EDHOC draft cannot be correct.  On the one
> hand, the EDHOC estimates for messages 2 and 3 are all below the above
> minimums..  On the other hand, the DTLS size estimates indicate a not very
> aggressive optimization, since they are all well above these minimums.
>
>
>
> 2. The difference between EDHOC and DTLS is at most 32 octets.  Whatever
> encoding you adopt for EDHOC, it can be translated to DTLS at a cost of 32
> octets.  Difference is therefore 64 at most 64 octets based on just that
> data.
>
>
>
> 3. The primary driver of the size difference between EDHOC and DTLS is the
> DTLS Finished MAC.
>
>
>
> Basically, EDHOC claims they can get away without the Finished MAC because
> the correct stuff is covered under the AEAD tag.  However, if this approach
> is correct, then you could also "virtualize" the DTLS Finished MAC by
> having the peers include it in the AEAD calculation, but strip it from
> what's sent on the wire.  In either case, fresh analysis is needed.  But an
> analysis of DTLS with a virtualized MAC seems much simpler and more focused
> than starting from scratch.
>
>
>
> Hope folks find this helpful.
>
>
>
> --Richard
>

--000000000000d455e6058314be8b
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Fair point, Jim, but I don&#39;t think it actually ma=
tters -- you could just as well add key IDs to TLS, e.g., as a new certific=
ate type (cf. RFC 7250).=C2=A0 So subtract the 32 bytes of PUBKEY from all =
accounts, and we&#39;re still at 32 bytes/message of difference.</div><div>=
<br></div><div>--Richard<br></div></div><br><div class=3D"gmail_quote"><div=
 dir=3D"ltr" class=3D"gmail_attr">On Fri, Mar 1, 2019 at 6:23 PM Jim Schaad=
 &lt;<a href=3D"mailto:ietf@augustcellars.com">ietf@augustcellars.com</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div l=
ang=3D"EN-US"><div class=3D"gmail-m_-7103408709112406554WordSection1"><p cl=
ass=3D"MsoNormal">Richard,<u></u><u></u></p><p class=3D"MsoNormal"><u></u>=
=C2=A0<u></u></p><p class=3D"MsoNormal">You incorrectly translated the EDHO=
C protocol below.<u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u><=
/u></p><p class=3D"MsoNormal">Jim<u></u><u></u></p><p class=3D"MsoNormal"><=
u></u>=C2=A0<u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div =
style=3D"border-color:currentcolor currentcolor currentcolor blue;border-st=
yle:none none none solid;border-width:medium medium medium 1.5pt;padding:0i=
n 0in 0in 4pt"><div><div style=3D"border-color:rgb(225,225,225) currentcolo=
r currentcolor;border-style:solid none none;border-width:1pt medium medium;=
padding:3pt 0in 0in"><p class=3D"MsoNormal"><b>From:</b> Secdispatch &lt;<a=
 href=3D"mailto:secdispatch-bounces@ietf.org" target=3D"_blank">secdispatch=
-bounces@ietf.org</a>&gt; <b>On Behalf Of </b>Richard Barnes<br><b>Sent:</b=
> Friday, March 1, 2019 9:09 AM<br><b>To:</b> <a href=3D"mailto:secdispatch=
@ietf.org" target=3D"_blank">secdispatch@ietf.org</a><br><b>Subject:</b> [S=
ecdispatch] DTLS - EDHOC &lt;=3D 32<u></u><u></u></p></div></div><p class=
=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><div><p class=3D"MsoNormal">Hey=
 folks,<u></u><u></u></p></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u>=
</u></p></div><div><p class=3D"MsoNormal">To try to understand the size arg=
uments w.r.t. EDHOC / DTLS, I sat down and tried to lower-bound the size of=
 the messages in each protocol.=C2=A0 The theory I&#39;m using here is: The=
 only things that really need to be in these protocols are the crypto varia=
bles.=C2=A0 Everything else is just a matter of encoding or pre-negotiation=
.=C2=A0 Under that theory, consider the following cartoon sketches of the t=
wo protocols in the full handshake, mutually authenticated with asymmetric =
keys, including minimum sizes in octets assuming a 128-bit security level:<=
u></u><u></u></p></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>=
</div><div><p class=3D"MsoNormal">DTLS 1.3 (mutually authenticated):<u></u>=
<u></u></p></div><div><p class=3D"MsoNormal">1. C-&gt;S: DH (32)<u></u><u><=
/u></p></div><div><p class=3D"MsoNormal">2. S-&gt;C: DH, PUBKEY, SIG, MAC, =
TAG (176 =3D 32 + 32 + 64 + 32 + 16)<u></u><u></u></p></div><div><p class=
=3D"MsoNormal">3. C-&gt;S: PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16=
)<u></u><u></u></p></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></=
p></div><div><p class=3D"MsoNormal">EDHOC:<u></u><u></u></p></div><div><p c=
lass=3D"MsoNormal">1. C-&gt;S: DH (32)<u></u><u></u></p></div><div><p class=
=3D"MsoNormal">2. S-&gt;C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 + 16)=
<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0=C2=A0 <span style=3D"color:=
red">2.=C2=A0 S-&gt;C: DH, SIG, TAG (112 =3D 32 + 64 + 16)<u></u><u></u></s=
pan></p></div><div><p class=3D"MsoNormal">3. C-&gt;S: PUBKEY, SIG, TAG (112=
 =3D 32 + 64 + 16)<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0=C2=A0 <sp=
an style=3D"color:red">=C2=A02. C-&gt;S: SIG, Tag (80 =3D 64+16)<u></u><u><=
/u></span></p><p class=3D"MsoNormal"><span style=3D"color:red"><u></u>=C2=
=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"color:red">EDHOC=
 is defined to send a key identifier rather than a key.<u></u><u></u></span=
></p></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><=
p class=3D"MsoNormal">The conclusions I draw from this (assuming the above =
summary is correct):<u></u><u></u></p></div><div><p class=3D"MsoNormal"><u>=
</u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal">1. The size estimate=
s in the EDHOC draft cannot be correct.=C2=A0 On the one hand, the EDHOC es=
timates for messages 2 and 3 are all below the above minimums..=C2=A0 On th=
e other hand, the DTLS size estimates indicate a not very aggressive optimi=
zation, since they are all well above these minimums.<u></u><u></u></p><div=
><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoN=
ormal">2. The difference between EDHOC and DTLS is at most 32 octets.=C2=A0=
 Whatever encoding you adopt for EDHOC, it can be translated to DTLS at a c=
ost of 32 octets.<span style=3D"color:red">=C2=A0 Difference is therefore 6=
4 at most 64 octets based on just that data.<u></u><u></u></span></p></div>=
</div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p cla=
ss=3D"MsoNormal">3. The primary driver of the size difference between EDHOC=
 and DTLS is the DTLS Finished MAC.<u></u><u></u></p></div><div><p class=3D=
"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal">Basic=
ally, EDHOC claims they can get away without the Finished MAC because the c=
orrect stuff is covered under the AEAD tag.=C2=A0 However, if this approach=
 is correct, then you could also &quot;virtualize&quot; the DTLS Finished M=
AC by having the peers include it in the AEAD calculation, but strip it fro=
m what&#39;s sent on the wire.=C2=A0 In either case, fresh analysis is need=
ed.=C2=A0 But an analysis of DTLS with a virtualized MAC seems much simpler=
 and more focused than starting from scratch.<u></u><u></u></p></div><div><=
p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNor=
mal">Hope folks find this helpful.<u></u><u></u></p></div><div><p class=3D"=
MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal">--Rich=
ard<u></u><u></u></p></div></div></div></div></div></blockquote></div>

--000000000000d455e6058314be8b--


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Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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I have never done an implementation of TLS, about how many lines of code =
do you think it would be.  If you do all of the changes that would be =
necessary to scale things down you basically have a brand new code base =
in any event.  I have done an implementation of EDHOC once upon a time =
so I have an idea of how big of a code base that is.

=20

Assume that crypto does not count as that would be the same for both =
implementations and is likely to be at least partly in hardware.

=20

Jim

=20

=20

From: Richard Barnes <rlb@ipv.sx>=20
Sent: Friday, March 1, 2019 8:13 PM
To: Jim Schaad <ietf@augustcellars.com>
Cc: secdispatch@ietf.org
Subject: Re: [Secdispatch] DTLS - EDHOC <=3D 32

=20

Fair point, Jim, but I don't think it actually matters -- you could just =
as well add key IDs to TLS, e.g., as a new certificate type (cf. RFC =
7250).  So subtract the 32 bytes of PUBKEY from all accounts, and we're =
still at 32 bytes/message of difference.

=20

--Richard

=20

On Fri, Mar 1, 2019 at 6:23 PM Jim Schaad <ietf@augustcellars.com =
<mailto:ietf@augustcellars.com> > wrote:

Richard,

=20

You incorrectly translated the EDHOC protocol below.

=20

Jim

=20

=20

From: Secdispatch <secdispatch-bounces@ietf.org =
<mailto:secdispatch-bounces@ietf.org> > On Behalf Of Richard Barnes
Sent: Friday, March 1, 2019 9:09 AM
To: secdispatch@ietf.org <mailto:secdispatch@ietf.org>=20
Subject: [Secdispatch] DTLS - EDHOC <=3D 32

=20

Hey folks,

=20

To try to understand the size arguments w.r.t. EDHOC / DTLS, I sat down =
and tried to lower-bound the size of the messages in each protocol.  The =
theory I'm using here is: The only things that really need to be in =
these protocols are the crypto variables.  Everything else is just a =
matter of encoding or pre-negotiation.  Under that theory, consider the =
following cartoon sketches of the two protocols in the full handshake, =
mutually authenticated with asymmetric keys, including minimum sizes in =
octets assuming a 128-bit security level:

=20

DTLS 1.3 (mutually authenticated):

1. C->S: DH (32)

2. S->C: DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32 + 64 + 32 + 16)

3. C->S: PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16)

=20

EDHOC:

1. C->S: DH (32)

2. S->C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 + 16)

   2.  S->C: DH, SIG, TAG (112 =3D 32 + 64 + 16)

3. C->S: PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)

    2. C->S: SIG, Tag (80 =3D 64+16)

=20

EDHOC is defined to send a key identifier rather than a key.

=20

The conclusions I draw from this (assuming the above summary is =
correct):

=20

1. The size estimates in the EDHOC draft cannot be correct.  On the one =
hand, the EDHOC estimates for messages 2 and 3 are all below the above =
minimums..  On the other hand, the DTLS size estimates indicate a not =
very aggressive optimization, since they are all well above these =
minimums.

=20

2. The difference between EDHOC and DTLS is at most 32 octets.  Whatever =
encoding you adopt for EDHOC, it can be translated to DTLS at a cost of =
32 octets.  Difference is therefore 64 at most 64 octets based on just =
that data.

=20

3. The primary driver of the size difference between EDHOC and DTLS is =
the DTLS Finished MAC.

=20

Basically, EDHOC claims they can get away without the Finished MAC =
because the correct stuff is covered under the AEAD tag.  However, if =
this approach is correct, then you could also "virtualize" the DTLS =
Finished MAC by having the peers include it in the AEAD calculation, but =
strip it from what's sent on the wire.  In either case, fresh analysis =
is needed.  But an analysis of DTLS with a virtualized MAC seems much =
simpler and more focused than starting from scratch.

=20

Hope folks find this helpful.

=20

--Richard


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>I have =
never done an implementation of TLS, about how many lines of code do you =
think it would be.=C2=A0 If you do all of the changes that would be =
necessary to scale things down you basically have a brand new code base =
in any event.=C2=A0 I have done an implementation of EDHOC once upon a =
time so I have an idea of how big of a code base that =
is.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Assume that crypto does not count as that would be the =
same for both implementations and is likely to be at least partly in =
hardware.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Jim<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b>From:</b> =
Richard Barnes &lt;rlb@ipv.sx&gt; <br><b>Sent:</b> Friday, March 1, 2019 =
8:13 PM<br><b>To:</b> Jim Schaad =
&lt;ietf@augustcellars.com&gt;<br><b>Cc:</b> =
secdispatch@ietf.org<br><b>Subject:</b> Re: [Secdispatch] DTLS - EDHOC =
&lt;=3D 32<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>Fair point, Jim, but I don't think it actually matters =
-- you could just as well add key IDs to TLS, e.g., as a new certificate =
type (cf. RFC 7250).&nbsp; So subtract the 32 bytes of PUBKEY from all =
accounts, and we're still at 32 bytes/message of =
difference.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>--Richard<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Fri, Mar 1, 2019 at 6:23 PM Jim Schaad &lt;<a =
href=3D"mailto:ietf@augustcellars.com">ietf@augustcellars.com</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Richard,<o:p=
></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>You =
incorrectly translated the EDHOC protocol below.<o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Jim<o:p></o:=
p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p><div style=3D'border:none;border-left:solid windowtext =
1.5pt;padding:0in 0in 0in 4.0pt;border-color:currentcolor currentcolor =
currentcolor blue'><div><div style=3D'border:none;border-top:solid =
windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:currentcolor =
currentcolor'><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>From:</b>=
 Secdispatch &lt;<a href=3D"mailto:secdispatch-bounces@ietf.org" =
target=3D"_blank">secdispatch-bounces@ietf.org</a>&gt; <b>On Behalf Of =
</b>Richard Barnes<br><b>Sent:</b> Friday, March 1, 2019 9:09 =
AM<br><b>To:</b> <a href=3D"mailto:secdispatch@ietf.org" =
target=3D"_blank">secdispatch@ietf.org</a><br><b>Subject:</b> =
[Secdispatch] DTLS - EDHOC &lt;=3D 32<o:p></o:p></p></div></div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hey =
folks,<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>To try to =
understand the size arguments w.r.t. EDHOC / DTLS, I sat down and tried =
to lower-bound the size of the messages in each protocol.&nbsp; The =
theory I'm using here is: The only things that really need to be in =
these protocols are the crypto variables.&nbsp; Everything else is just =
a matter of encoding or pre-negotiation.&nbsp; Under that theory, =
consider the following cartoon sketches of the two protocols in the full =
handshake, mutually authenticated with asymmetric keys, including =
minimum sizes in octets assuming a 128-bit security =
level:<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>DTLS 1.3 =
(mutually authenticated):<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>1. C-&gt;S: =
DH (32)<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>2. S-&gt;C: =
DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32 + 64 + 32 + =
16)<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>3. C-&gt;S: =
PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 32 + =
16)<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>EDHOC:<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>1. C-&gt;S: =
DH (32)<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>2. S-&gt;C: =
DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 + 16)<o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;&nbsp;=
 <span style=3D'color:red'>2.&nbsp; S-&gt;C: DH, SIG, TAG (112 =3D 32 + =
64 + 16)</span><o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>3. C-&gt;S: =
PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)<o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;&nbsp;=
 <span style=3D'color:red'>&nbsp;2. C-&gt;S: SIG, Tag (80 =3D =
64+16)</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'color:red'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'color:red'>EDHOC is defined to send a key identifier rather =
than a key.</span><o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>The =
conclusions I draw from this (assuming the above summary is =
correct):<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>1. The size =
estimates in the EDHOC draft cannot be correct.&nbsp; On the one hand, =
the EDHOC estimates for messages 2 and 3 are all below the above =
minimums..&nbsp; On the other hand, the DTLS size estimates indicate a =
not very aggressive optimization, since they are all well above these =
minimums.<o:p></o:p></p><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>2. The =
difference between EDHOC and DTLS is at most 32 octets.&nbsp; Whatever =
encoding you adopt for EDHOC, it can be translated to DTLS at a cost of =
32 octets.<span style=3D'color:red'>&nbsp; Difference is therefore 64 at =
most 64 octets based on just that =
data.</span><o:p></o:p></p></div></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>3. The =
primary driver of the size difference between EDHOC and DTLS is the DTLS =
Finished MAC.<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Basically, =
EDHOC claims they can get away without the Finished MAC because the =
correct stuff is covered under the AEAD tag.&nbsp; However, if this =
approach is correct, then you could also &quot;virtualize&quot; the DTLS =
Finished MAC by having the peers include it in the AEAD calculation, but =
strip it from what's sent on the wire.&nbsp; In either case, fresh =
analysis is needed.&nbsp; But an analysis of DTLS with a virtualized MAC =
seems much simpler and more focused than starting from =
scratch.<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hope folks =
find this helpful.<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>--Richard<o:=
p></o:p></p></div></div></div></div></div></blockquote></div></div></div>=
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Date: Sun, 03 Mar 2019 18:29:26 -0500
From: "Martin Thomson" <mt@lowentropy.net>
To: secdispatch@ietf.org
Content-Type: text/plain
Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/V9_shIrNFakpvVQshy3786uvJoU>
Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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We recently had someone do a completely new implementation of TLS.  I think that it's a pretty good example of a stack, though optimized for clarity and maintenance rather than size.  It's PSK mode, so it's a little more complex than ECDH.  It weighs in at just over 2k lines of JavaScript.  A fairly large proportion of that is dealing with the encoding in an ergonomic fashion.  Using a rigid encoding would eliminate almost all of that code.

If you want something closer to reality for small things, try https://bearssl.org/sizes.html  That isn't TLS 1.3, so it's probably a little off, but it's a fine basis for at least making an assessment.  It includes all the crypto, but you can get an idea of the costs.

On Sat, Mar 2, 2019, at 16:20, Jim Schaad wrote:
> I have never done an implementation of TLS, about how many lines of 
> code do you think it would be. If you do all of the changes that would 
> be necessary to scale things down you basically have a brand new code 
> base in any event. I have done an implementation of EDHOC once upon a 
> time so I have an idea of how big of a code base that is.
> 
> 
> Assume that crypto does not count as that would be the same for both 
> implementations and is likely to be at least partly in hardware.
> 
> 
> Jim
> 
> 
> 
> *From:* Richard Barnes <rlb@ipv.sx> 
> *Sent:* Friday, March 1, 2019 8:13 PM
> *To:* Jim Schaad <ietf@augustcellars.com>
> *Cc:* secdispatch@ietf.org
> *Subject:* Re: [Secdispatch] DTLS - EDHOC <= 32
> 
> 
> Fair point, Jim, but I don't think it actually matters -- you could 
> just as well add key IDs to TLS, e.g., as a new certificate type (cf. 
> RFC 7250). So subtract the 32 bytes of PUBKEY from all accounts, and 
> we're still at 32 bytes/message of difference.
> 
> 
> --Richard
> 
> 
> On Fri, Mar 1, 2019 at 6:23 PM Jim Schaad <ietf@augustcellars.com> wrote:
> 
> > Richard,
> 
> 
> > You incorrectly translated the EDHOC protocol below.
> 
> 
> > Jim
> 
> 
> 
> > *From:* Secdispatch <secdispatch-bounces@ietf.org> *On Behalf Of *Richard Barnes
> > *Sent:* Friday, March 1, 2019 9:09 AM
> > *To:* secdispatch@ietf.org
> > *Subject:* [Secdispatch] DTLS - EDHOC <= 32
> 
> 
> > Hey folks,
> 
> 
> > To try to understand the size arguments w.r.t. EDHOC / DTLS, I sat down and tried to lower-bound the size of the messages in each protocol. The theory I'm using here is: The only things that really need to be in these protocols are the crypto variables. Everything else is just a matter of encoding or pre-negotiation. Under that theory, consider the following cartoon sketches of the two protocols in the full handshake, mutually authenticated with asymmetric keys, including minimum sizes in octets assuming a 128-bit security level:
> 
> 
> > DTLS 1.3 (mutually authenticated):
> 
> > 1. C->S: DH (32)
> 
> > 2. S->C: DH, PUBKEY, SIG, MAC, TAG (176 = 32 + 32 + 64 + 32 + 16)
> 
> > 3. C->S: PUBKEY, SIG, MAC, TAG (144 = 32 + 64 + 32 + 16)
> 
> 
> > EDHOC:
> 
> > 1. C->S: DH (32)
> 
> > 2. S->C: DH, PUBKEY, SIG, TAG (144 = 32 + 32 + 64 + 16)
> 
> > 2. S->C: DH, SIG, TAG (112 = 32 + 64 + 16)
> 
> > 3. C->S: PUBKEY, SIG, TAG (112 = 32 + 64 + 16)
> 
> >  2. C->S: SIG, Tag (80 = 64+16)
> 
> 
> > EDHOC is defined to send a key identifier rather than a key.
> 
> 
> > The conclusions I draw from this (assuming the above summary is correct):
> 
> 
> > 1. The size estimates in the EDHOC draft cannot be correct. On the one hand, the EDHOC estimates for messages 2 and 3 are all below the above minimums.. On the other hand, the DTLS size estimates indicate a not very aggressive optimization, since they are all well above these minimums.
> 
> 
> > 2. The difference between EDHOC and DTLS is at most 32 octets. Whatever encoding you adopt for EDHOC, it can be translated to DTLS at a cost of 32 octets. Difference is therefore 64 at most 64 octets based on just that data.
> 
> 
> > 3. The primary driver of the size difference between EDHOC and DTLS is the DTLS Finished MAC.
> 
> 
> > Basically, EDHOC claims they can get away without the Finished MAC because the correct stuff is covered under the AEAD tag. However, if this approach is correct, then you could also "virtualize" the DTLS Finished MAC by having the peers include it in the AEAD calculation, but strip it from what's sent on the wire. In either case, fresh analysis is needed. But an analysis of DTLS with a virtualized MAC seems much simpler and more focused than starting from scratch.
> 
> 
> > Hope folks find this helpful.
> 
> 
> > --Richard
> 
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>


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From: John Mattsson <john.mattsson@ericsson.com>
To: "secdispatch@ietf.org" <secdispatch@ietf.org>, "ace@ietf.org" <ace@ietf.org>
Thread-Topic: [Secdispatch] FW: [secdir] EDHOC and Transports
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Subject: Re: [Secdispatch] FW: [secdir] EDHOC and Transports
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From: John Mattsson <john.mattsson@ericsson.com>
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Thread-Topic: CFRG Crypto Review Panel reviews of draft-selander-ace-cose-ecdhe-12
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In-Reply-To: <000d01d4d0b7$911a9ce0$b34fd6a0$@augustcellars.com>
From: Richard Barnes <rlb@ipv.sx>
Date: Mon, 4 Mar 2019 07:11:52 -0500
Message-ID: <CAL02cgQxz-dszSsJea5pvH1Oketxs9JipmzFG9JpfuSDcdh3xg@mail.gmail.com>
To: Jim Schaad <ietf@augustcellars.com>
Cc: secdispatch@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/ghteoj0MxIo88u63A89eG0mm8nY>
Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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--000000000000beb75f058343aa62
Content-Type: text/plain; charset="UTF-8"

Since you asked, I just went ahead and implemented a "femtoTLS" variant
over the weekend.  It's about 420 lines of Go, leveraging some crypto
routines and message formats from Mint.

https://github.com/bifurcation/mint/compare/ftls

The protocol outlined there is TLS 1.3, but with the ClientHello, Server
Hello, and Certificate message replaced with smaller variants.  The message
sizes are as follows:

m1 (ClientHello):  56
m2 (ServerHello, Certificate, CertificateVerify, Finished) : 178
m3 (Certificate, CertificateVerify, Finished): 125

Just to highlight the framing / negotiation overhead:

m1 = Random(16) + DH(32) + Overhead(8)
m2 = Random(16) + DH(32) + SIG(64) + MAC(32) + TAG(16) + Overhead(18)
m3 = SIG(64) + MAC(32) + TAG(16) + Overhead(13)

The optimization here is pretty light; you could save a few more overhead
octets if you were willing to special-case the syntax more.  Encoding in
CBOR seems like it would probably produce results in the same ballpark.

This also nicely highlights the crypto shortcuts that EDHOC is benefitting
from:

- Omitting Random values in the first two messages
- Relying on an AEAD tag instead of the Finished MAC


On Sat, Mar 2, 2019 at 12:20 AM Jim Schaad <ietf@augustcellars.com> wrote:

> I have never done an implementation of TLS, about how many lines of code
> do you think it would be.  If you do all of the changes that would be
> necessary to scale things down you basically have a brand new code base in
> any event.  I have done an implementation of EDHOC once upon a time so I
> have an idea of how big of a code base that is.
>
>
>
> Assume that crypto does not count as that would be the same for both
> implementations and is likely to be at least partly in hardware.
>
>
>
> Jim
>
>
>
>
>
> *From:* Richard Barnes <rlb@ipv.sx>
> *Sent:* Friday, March 1, 2019 8:13 PM
> *To:* Jim Schaad <ietf@augustcellars.com>
> *Cc:* secdispatch@ietf.org
> *Subject:* Re: [Secdispatch] DTLS - EDHOC <= 32
>
>
>
> Fair point, Jim, but I don't think it actually matters -- you could just
> as well add key IDs to TLS, e.g., as a new certificate type (cf. RFC
> 7250).  So subtract the 32 bytes of PUBKEY from all accounts, and we're
> still at 32 bytes/message of difference.
>
>
>
> --Richard
>
>
>
> On Fri, Mar 1, 2019 at 6:23 PM Jim Schaad <ietf@augustcellars.com> wrote:
>
> Richard,
>
>
>
> You incorrectly translated the EDHOC protocol below.
>
>
>
> Jim
>
>
>
>
>
> *From:* Secdispatch <secdispatch-bounces@ietf.org> *On Behalf Of *Richard
> Barnes
> *Sent:* Friday, March 1, 2019 9:09 AM
> *To:* secdispatch@ietf.org
> *Subject:* [Secdispatch] DTLS - EDHOC <= 32
>
>
>
> Hey folks,
>
>
>
> To try to understand the size arguments w.r.t. EDHOC / DTLS, I sat down
> and tried to lower-bound the size of the messages in each protocol.  The
> theory I'm using here is: The only things that really need to be in these
> protocols are the crypto variables.  Everything else is just a matter of
> encoding or pre-negotiation.  Under that theory, consider the following
> cartoon sketches of the two protocols in the full handshake, mutually
> authenticated with asymmetric keys, including minimum sizes in octets
> assuming a 128-bit security level:
>
>
>
> DTLS 1.3 (mutually authenticated):
>
> 1. C->S: DH (32)
>
> 2. S->C: DH, PUBKEY, SIG, MAC, TAG (176 = 32 + 32 + 64 + 32 + 16)
>
> 3. C->S: PUBKEY, SIG, MAC, TAG (144 = 32 + 64 + 32 + 16)
>
>
>
> EDHOC:
>
> 1. C->S: DH (32)
>
> 2. S->C: DH, PUBKEY, SIG, TAG (144 = 32 + 32 + 64 + 16)
>
>    2.  S->C: DH, SIG, TAG (112 = 32 + 64 + 16)
>
> 3. C->S: PUBKEY, SIG, TAG (112 = 32 + 64 + 16)
>
>     2. C->S: SIG, Tag (80 = 64+16)
>
>
>
> EDHOC is defined to send a key identifier rather than a key.
>
>
>
> The conclusions I draw from this (assuming the above summary is correct):
>
>
>
> 1. The size estimates in the EDHOC draft cannot be correct.  On the one
> hand, the EDHOC estimates for messages 2 and 3 are all below the above
> minimums..  On the other hand, the DTLS size estimates indicate a not very
> aggressive optimization, since they are all well above these minimums.
>
>
>
> 2. The difference between EDHOC and DTLS is at most 32 octets.  Whatever
> encoding you adopt for EDHOC, it can be translated to DTLS at a cost of 32
> octets.  Difference is therefore 64 at most 64 octets based on just that
> data.
>
>
>
> 3. The primary driver of the size difference between EDHOC and DTLS is the
> DTLS Finished MAC.
>
>
>
> Basically, EDHOC claims they can get away without the Finished MAC because
> the correct stuff is covered under the AEAD tag.  However, if this approach
> is correct, then you could also "virtualize" the DTLS Finished MAC by
> having the peers include it in the AEAD calculation, but strip it from
> what's sent on the wire.  In either case, fresh analysis is needed.  But an
> analysis of DTLS with a virtualized MAC seems much simpler and more focused
> than starting from scratch.
>
>
>
> Hope folks find this helpful.
>
>
>
> --Richard
>
>

--000000000000beb75f058343aa62
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>Si=
nce you asked, I just went ahead and implemented a &quot;femtoTLS&quot; var=
iant over the weekend.=C2=A0 It&#39;s about 420 lines of Go, leveraging som=
e crypto routines and message formats from Mint.<br></div><div><br></div><d=
iv><a href=3D"https://github.com/bifurcation/mint/compare/ftls">https://git=
hub.com/bifurcation/mint/compare/ftls</a><br></div><div><br></div><div>The =
protocol outlined there is TLS 1.3, but with the ClientHello, Server Hello,=
 and Certificate message replaced with smaller variants.=C2=A0 The message =
sizes are as follows:</div><div><br></div>m1 (ClientHello):=C2=A0 56<br>m2 =
(ServerHello, Certificate, CertificateVerify, Finished) : 178<br>m3 (Certif=
icate, CertificateVerify, Finished): 125<div><br></div><div>Just to highlig=
ht the framing / negotiation overhead:</div><div><br></div><div>m1 =3D Rand=
om(16) + DH(32) + Overhead(8)<br></div><div>m2 =3D Random(16) + DH(32) + SI=
G(64) + MAC(32) + TAG(16) + Overhead(18)</div><div>m3 =3D SIG(64) + MAC(32)=
 + TAG(16) + Overhead(13)</div><div dir=3D"ltr"><br></div><div>The optimiza=
tion here is pretty light; you could save a few more overhead octets if you=
 were willing to special-case the syntax more.=C2=A0 Encoding in CBOR seems=
 like it would probably produce results in the same ballpark.<br></div><div=
 dir=3D"ltr"><br></div><div>This also nicely highlights the crypto shortcut=
s that EDHOC is benefitting from:</div><div><br></div><div>- Omitting Rando=
m values in the first two messages</div><div>- Relying on an AEAD tag inste=
ad of the Finished MAC</div><div dir=3D"ltr"><div><br></div></div></div></d=
iv></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gma=
il_attr">On Sat, Mar 2, 2019 at 12:20 AM Jim Schaad &lt;<a href=3D"mailto:i=
etf@augustcellars.com">ietf@augustcellars.com</a>&gt; wrote:<br></div><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:=
1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"EN-US"><div class=
=3D"gmail-m_3951388758785986334WordSection1"><p class=3D"MsoNormal">I have =
never done an implementation of TLS, about how many lines of code do you th=
ink it would be.=C2=A0 If you do all of the changes that would be necessary=
 to scale things down you basically have a brand new code base in any event=
.=C2=A0 I have done an implementation of EDHOC once upon a time so I have a=
n idea of how big of a code base that is.<u></u><u></u></p><p class=3D"MsoN=
ormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Assume that crypto do=
es not count as that would be the same for both implementations and is like=
ly to be at least partly in hardware.<u></u><u></u></p><p class=3D"MsoNorma=
l"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Jim<u></u><u></u></p><p c=
lass=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal"><u></u>=
=C2=A0<u></u></p><div style=3D"border-color:currentcolor currentcolor curre=
ntcolor blue;border-style:none none none solid;border-width:medium medium m=
edium 1.5pt;padding:0in 0in 0in 4pt"><div><div style=3D"border-color:rgb(22=
5,225,225) currentcolor currentcolor;border-style:solid none none;border-wi=
dth:1pt medium medium;padding:3pt 0in 0in"><p class=3D"MsoNormal"><b>From:<=
/b> Richard Barnes &lt;rlb@ipv.sx&gt; <br><b>Sent:</b> Friday, March 1, 201=
9 8:13 PM<br><b>To:</b> Jim Schaad &lt;<a href=3D"mailto:ietf@augustcellars=
.com" target=3D"_blank">ietf@augustcellars.com</a>&gt;<br><b>Cc:</b> <a hre=
f=3D"mailto:secdispatch@ietf.org" target=3D"_blank">secdispatch@ietf.org</a=
><br><b>Subject:</b> Re: [Secdispatch] DTLS - EDHOC &lt;=3D 32<u></u><u></u=
></p></div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><div><=
p class=3D"MsoNormal">Fair point, Jim, but I don&#39;t think it actually ma=
tters -- you could just as well add key IDs to TLS, e.g., as a new certific=
ate type (cf. RFC 7250).=C2=A0 So subtract the 32 bytes of PUBKEY from all =
accounts, and we&#39;re still at 32 bytes/message of difference.<u></u><u><=
/u></p></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div=
><p class=3D"MsoNormal">--Richard<u></u><u></u></p></div></div><p class=3D"=
MsoNormal"><u></u>=C2=A0<u></u></p><div><div><p class=3D"MsoNormal">On Fri,=
 Mar 1, 2019 at 6:23 PM Jim Schaad &lt;<a href=3D"mailto:ietf@augustcellars=
.com" target=3D"_blank">ietf@augustcellars.com</a>&gt; wrote:<u></u><u></u>=
</p></div><blockquote style=3D"border-color:currentcolor currentcolor curre=
ntcolor rgb(204,204,204);border-style:none none none solid;border-width:med=
ium medium medium 1pt;padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-righ=
t:0in"><div><div><p class=3D"MsoNormal">Richard,<u></u><u></u></p><p class=
=3D"MsoNormal">=C2=A0<u></u><u></u></p><p class=3D"MsoNormal">You incorrect=
ly translated the EDHOC protocol below.<u></u><u></u></p><p class=3D"MsoNor=
mal">=C2=A0<u></u><u></u></p><p class=3D"MsoNormal">Jim<u></u><u></u></p><p=
 class=3D"MsoNormal">=C2=A0<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0<=
u></u><u></u></p><div style=3D"border-style:none none none solid;border-wid=
th:medium medium medium 1.5pt;padding:0in 0in 0in 4pt;border-color:currentc=
olor currentcolor currentcolor blue"><div><div style=3D"border-style:solid =
none none;border-width:1pt medium medium;padding:3pt 0in 0in;border-color:c=
urrentcolor"><p class=3D"MsoNormal"><b>From:</b> Secdispatch &lt;<a href=3D=
"mailto:secdispatch-bounces@ietf.org" target=3D"_blank">secdispatch-bounces=
@ietf.org</a>&gt; <b>On Behalf Of </b>Richard Barnes<br><b>Sent:</b> Friday=
, March 1, 2019 9:09 AM<br><b>To:</b> <a href=3D"mailto:secdispatch@ietf.or=
g" target=3D"_blank">secdispatch@ietf.org</a><br><b>Subject:</b> [Secdispat=
ch] DTLS - EDHOC &lt;=3D 32<u></u><u></u></p></div></div><p class=3D"MsoNor=
mal">=C2=A0<u></u><u></u></p><div><div><p class=3D"MsoNormal">Hey folks,<u>=
</u><u></u></p></div><div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p></=
div><div><p class=3D"MsoNormal">To try to understand the size arguments w.r=
.t. EDHOC / DTLS, I sat down and tried to lower-bound the size of the messa=
ges in each protocol.=C2=A0 The theory I&#39;m using here is: The only thin=
gs that really need to be in these protocols are the crypto variables.=C2=
=A0 Everything else is just a matter of encoding or pre-negotiation.=C2=A0 =
Under that theory, consider the following cartoon sketches of the two proto=
cols in the full handshake, mutually authenticated with asymmetric keys, in=
cluding minimum sizes in octets assuming a 128-bit security level:<u></u><u=
></u></p></div><div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p></div><d=
iv><p class=3D"MsoNormal">DTLS 1.3 (mutually authenticated):<u></u><u></u><=
/p></div><div><p class=3D"MsoNormal">1. C-&gt;S: DH (32)<u></u><u></u></p><=
/div><div><p class=3D"MsoNormal">2. S-&gt;C: DH, PUBKEY, SIG, MAC, TAG (176=
 =3D 32 + 32 + 64 + 32 + 16)<u></u><u></u></p></div><div><p class=3D"MsoNor=
mal">3. C-&gt;S: PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16)<u></u><u=
></u></p></div><div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p></div><d=
iv><p class=3D"MsoNormal">EDHOC:<u></u><u></u></p></div><div><p class=3D"Ms=
oNormal">1. C-&gt;S: DH (32)<u></u><u></u></p></div><div><p class=3D"MsoNor=
mal">2. S-&gt;C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 + 16)<u></u><u>=
</u></p><p class=3D"MsoNormal">=C2=A0=C2=A0 <span style=3D"color:red">2.=C2=
=A0 S-&gt;C: DH, SIG, TAG (112 =3D 32 + 64 + 16)</span><u></u><u></u></p></=
div><div><p class=3D"MsoNormal">3. C-&gt;S: PUBKEY, SIG, TAG (112 =3D 32 + =
64 + 16)<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0=C2=A0 <span style=
=3D"color:red">=C2=A02. C-&gt;S: SIG, Tag (80 =3D 64+16)</span><u></u><u></=
u></p><p class=3D"MsoNormal"><span style=3D"color:red">=C2=A0</span><u></u>=
<u></u></p><p class=3D"MsoNormal"><span style=3D"color:red">EDHOC is define=
d to send a key identifier rather than a key.</span><u></u><u></u></p></div=
><div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p></div><div><p class=3D=
"MsoNormal">The conclusions I draw from this (assuming the above summary is=
 correct):<u></u><u></u></p></div><div><p class=3D"MsoNormal">=C2=A0<u></u>=
<u></u></p></div><div><p class=3D"MsoNormal">1. The size estimates in the E=
DHOC draft cannot be correct.=C2=A0 On the one hand, the EDHOC estimates fo=
r messages 2 and 3 are all below the above minimums..=C2=A0 On the other ha=
nd, the DTLS size estimates indicate a not very aggressive optimization, si=
nce they are all well above these minimums.<u></u><u></u></p><div><p class=
=3D"MsoNormal">=C2=A0<u></u><u></u></p></div><div><p class=3D"MsoNormal">2.=
 The difference between EDHOC and DTLS is at most 32 octets.=C2=A0 Whatever=
 encoding you adopt for EDHOC, it can be translated to DTLS at a cost of 32=
 octets.<span style=3D"color:red">=C2=A0 Difference is therefore 64 at most=
 64 octets based on just that data.</span><u></u><u></u></p></div></div><di=
v><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p></div><div><p class=3D"Mso=
Normal">3. The primary driver of the size difference between EDHOC and DTLS=
 is the DTLS Finished MAC.<u></u><u></u></p></div><div><p class=3D"MsoNorma=
l">=C2=A0<u></u><u></u></p></div><div><p class=3D"MsoNormal">Basically, EDH=
OC claims they can get away without the Finished MAC because the correct st=
uff is covered under the AEAD tag.=C2=A0 However, if this approach is corre=
ct, then you could also &quot;virtualize&quot; the DTLS Finished MAC by hav=
ing the peers include it in the AEAD calculation, but strip it from what&#3=
9;s sent on the wire.=C2=A0 In either case, fresh analysis is needed.=C2=A0=
 But an analysis of DTLS with a virtualized MAC seems much simpler and more=
 focused than starting from scratch.<u></u><u></u></p></div><div><p class=
=3D"MsoNormal">=C2=A0<u></u><u></u></p></div><div><p class=3D"MsoNormal">Ho=
pe folks find this helpful.<u></u><u></u></p></div><div><p class=3D"MsoNorm=
al">=C2=A0<u></u><u></u></p></div><div><p class=3D"MsoNormal">--Richard<u><=
/u><u></u></p></div></div></div></div></div></blockquote></div></div></div>=
</div></blockquote></div>

--000000000000beb75f058343aa62--


From nobody Mon Mar  4 08:26:12 2019
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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
To: John Mattsson <john.mattsson@ericsson.com>, "ace@ietf.org" <ace@ietf.org>,  "lwip@ietf.org" <lwip@ietf.org>, "secdispatch@ietf.org" <secdispatch@ietf.org>
CC: Benjamin Kaduk <kaduk@mit.edu>, "salvador.p.f@um.es" <salvador.p.f@um.es>
Thread-Topic: [Ace] EDHOC standardization
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Date: Mon, 4 Mar 2019 16:25:54 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/CUD4Du2qKm5dNfuNSy_wOaKHnDg>
Subject: Re: [Secdispatch] [Ace] EDHOC standardization
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Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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From: Rene Struik <rstruik.ext@gmail.com>
To: John Mattsson <john.mattsson@ericsson.com>
Cc: "secdispatch@ietf.org" <secdispatch@ietf.org>, =?UTF-8?Q?G=c3=b6ran_Selander?= <goran.selander@ericsson.com>, 'Benjamin Kaduk' <kaduk@mit.edu>, "Ace@ietf.org" <Ace@ietf.org>
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Subject: [Secdispatch] (details on use case scenario?) Re: [Lwip] [Ace] EDHOC standardization
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Hi John, Goran:

It is not easy to follow the discussion on EDHOC (except for witnessing 
a byte-count slinging contest on the mailing list).

I think it would be good to look at the big picture, i.e., which problem 
does one solve and/or does one solve the right problem.

I would like to understand somewhat better how the scheme suggested in 
[1] could help in facilitating fast network enrollment and network  
formation.

Could you describe how to use this in the following scenario:
1) Network with one central manager and N=1,000 nodes that wish to join 
the network roughly at the same time, where the network manager is, say, 
10 hops away from the joining nodes;
2) Authenticated key agreement using cert-based key agreement;
3) Network uses time-synchronized scheduling (such as in 6tisch) - where 
local single-hop communication time latency is 10 seconds);
4) The network manager may have high-bandwidth with outside world, but 
joining node/network manager path uses relatively low-bandwidth pipe 
that may only be available intermittently, with preset schedule);
5) It is unknown beforehand which entry point the joining nodes will 
pick when trying to enroll to the network?

While the draft refers to lots of details from other protocols that are 
used under the hood, it would be good to abstract from this for now and 
describe basics first.

I tend to agree with others that lossless data compression could result 
in some savings, with some give and take re encoding rules (see also 
[2]). Even if one finds a magic compression bullet at zero incremental 
cost, though, the more important question is what problem one solves 
and/or whether one solves the right problem. {As an aside, 802.15.4 
(which is the MAC with the 127-byte payload limit mentioned) does not 
easily allow mixed secured/unsecured communications (but I do not think 
it is useful to have a side-discussion on that detail right now).}

The other question I have is whether it would be more important to hide 
the identity of the joining node in a network enrollment scenario than 
to hide the network manager's identity, or the other way around.

 From [1], Section 1.1:
EDHOC is optimized for small message sizes and can therefore be sent 
over a small number of radio frames. The message size of a key exchange 
protocol may have a large impact on the performance of an IoT 
deployment, especially in noisy environments. For example, in a network 
bootstrapping setting a large number of devices turned on in a short 
period of time may result in large latencies caused by parallel key 
exchanges.

Ref: [1] draft-selander-ace-cose-ecdhe-12
         [2] Email RS as of October 31, 2018, 2.32pm EDT, subject: 
https://mailarchive.ietf.org/arch/browse/ace/?q=struik

On 11/22/2018 10:43 AM, Rene Struik wrote:
> Hi John:
>
> When comparing protocols, it would be useful to protocol flows 
> optimization, as follows:
> a) optimized for parallelized online computations;
> b) optimized for minimization of message flows.
> See also slide 6 of my CFRG-83 presentation of March 30, 2012 
> (slides-83-cfrg-05 attached; I could not find CFRG records online).
>
> The current draft-selander-ace-cose-ecdhe-10 document considers 
> optimization b), which minimizes the number of message flows, but does 
> require each party to compute the shared key consecutively, rather 
> than in parallel (as in optimization a).
>
> With option a), if one really wishes to squeeze as much info into a 
> 128-octet datagram, one can already send A's ephemeral ECDSA signature 
> key in message flow 1, thereby cutting down the
> size of the second message flow of the Sigma protocol depicted in Fig. 
> 1 
> (https://tools.ietf.org/html/draft-selander-ace-cose-ecdhe-10#page-11) 
> by 32 octets. This tackles the 120-octet byte count for the second 
> flow of Fig. 1 quite simply, while leading to a 4-pass protocol flow 
> (with roughly 70/70/55/55 bytes in flows 1/2/3/4).
>
> Obviously, this presents a trade-off, but quite well be worth it in 
> settings where online key computations are quite slow on some 
> platforms and where scheduling (e.g., with TSCH) can now be done with 
> less consideration of the individual computational capabilities of 
> devices (since now one does not need to build-in a worst-case 2 x "key 
> computation back-off" for least capable devices, but can just use the 
> 1x contingency for this).
>
> The parallel version is depicted below.
>
> Party U Party V | C_U, X_U, ALG_1, UAD_1, R_Sig(U;...) | 
> +--------------------------------------------------------------------->| 
> | message_1 | | | | C_U, C_V, X_V, ALG_2, R_Sig(V; ...) | 
> |<---------------------------------------------------------------------+ 
> | message_2 | | | | S_U, AEAD(K_3; ID_CRED_U, s_Sig(U; CRED_U, aad_3), 
> PAD_3) | 
> +--------------------------------------------------------------------->+ 
> | message_3 |
> | | | S_V, AEAD(K_2; ID_CRED_V, s_Sig(V; CRED_V, aad_2), UAD_2)| | 
> +<---------------------------------------------------------------------| 
> | message_4 | 
> ============================================================================== 
>
> Flight                                #1         #2        #3    #4 	Total
> ------------------------------------------------------------------------------
> DTLS 1.3 RPK + ECDHE                 143        364       212     -   	721
> TLS 1.3  RPK + ECDHE                 129        322       194     -   	645
> EDHOC    RPK + ECDHE                  37        120        85     -   	242
> --> EDHOC parallel flow		      70         70        55     55    250
> On 11/22/2018 7:23 AM, John Mattsson wrote:
>> Hi Jim,
>>
>>> In the analysis that I did I very deliberately used TLS not DTLS.  The main reason for using DTLS is because one is operating in the UDP environment and one cannot have reliable in order delivery.  Since EDHOC is being built on top of CoAP, one can use CoAP to create reliable in order delivery.  Thus, the extra bytes that DTLS has to deal with this are not needed.
>> I started with DTLS as that was what was discussion between Salvador and Benjamin. Below are numbers for TLS 1.3. Changes compared to DTLS 1.3 are that the record header is smaller, handshake headers are smaller, and that Connection ID is not supported in TLS 1.3. The numbers I get for TLS 1.3 are overall slightly bigger than the numbers in your estimate (but for PSK Flight #3 I get slightly smaller numbers). I think the difference is due to many smaller things like handshake headers and fields in the certificate structure that adds up. I plan to add TLS 1.3 numbers to draft-ietf-lwig-security-protocol-comparison as well.
>>
>> I agree with your comment Jim. Just now, I am just trying to count the number of bytes of the security protocol. To do a fair comparison, you have to choose a specific deployment and look at the topology, the whole protocol stack, frame sizes (e.g. 128 bytes), how and where in the protocol stack fragmentation is done, and the expected packet loss. There is ongoing work on such simulations for 6tisch. Fragmentation and/or packet loss lead to the total number of bytes in the table below has to be multiplied by some linear factor. And as more bytes often lead to increased packet loss, you often see a non-linear relation between logical number of bytes on the transport/application layer as shown in the table below and physical number of bytes and/or time from completion of the protocol. Any realistic comparison over constrained radio would make the difference between TLS 1.3 and EDHOC larger. A problem with TLS is that it does not support Connection ID.
>>
>> TLS Assumptions:
>> - Minimum number of algorithms and cipher suites offered
>> - Curve25519, ECDSA with P-256, AES-CCM_8, SHA-256
>> - Length of key identifiers: 4 bytes
>> - TLS RPK with point compression (saves 32 bytes)
>> - Only mandatory TLS extentions
>>
>> ==============================================================================
>> Flight                                #1         #2        #3       Total
>> ------------------------------------------------------------------------------
>> DTLS 1.3 RPK + ECDHE                 143        364       212        721
>> TLS 1.3  RPK + ECDHE                 129        322       194        645
>> EDHOC    RPK + ECDHE                  37        120        85        242
>> ------------------------------------------------------------------------------
>> DTLS 1.3 PSK + ECDHE                 180        183        56        419
>> TLS 1.3  PSK + ECDHE                 166        157        50        373
>> EDHOC    PSK + ECDHE                  42         46        11         99
>> ------------------------------------------------------------------------------
>> DTLS 1.3 PSK                         130        143        56        329
>> TLS 1.3  PSK                         116        117        50        283
>> ==============================================================================
>>                          Number of bytes (No connection ID)
>>
>> Below is detailed information about the different flights:
>>
>> ======================================================
>> TLS 1.3 Flight #1 RPK + ECDHE
>> ======================================================
>>
>> Record Header - TLSPlaintext (5 bytes)
>> 16 03 03 LL LL
>>
>> 	Handshake Header - Client Hello (4 bytes)
>> 	01 LL LL LL
>>
>> 		Legacy Version (2 bytes)
>> 		03 03
>>
>> 		Client Random (32 bytes)
>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>> 		Legacy Session ID (1 bytes)
>> 		00
>>
>> 		Cipher Suites (TLS_AES_128_CCM_8_SHA256) (4 bytes)
>> 		00 02 13 05
>>
>> 		Compression Methods (null) (2 bytes)
>> 		01 00
>>
>> 		Extensions Length (2 bytes)
>> 		LL LL
>>
>> 			Extension - Supported Groups (x25519) (8 bytes)
>> 			00 0a 00 04 00 02 00 1d
>>
>> 			Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>> 			00 0d 00 04 00 02 08 07
>>
>> 			Extension - Key Share (42 bytes)
>> 			00 33 00 26 00 24 00 1d 00 20
>> 			00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>> 			Extension - Supported Versions (1.3) (7 bytes)
>> 			00 2b 00 03 02 03 04
>>
>> 			Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>> 			00 13 00 01 01 02
>>
>> 			Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>> 			00 14 00 01 01 02
>>
>> 5 + 4 + 2 + 32 + 1 + 4 + 2 + 2 + 8 + 8 + 42 + 7 + 6 + 6 = 129 bytes
>>
>> ------------------------------------------------------
>> TLS 1.3 Flight #1 PSK + ECDHE
>> ------------------------------------------------------
>>
>> Differences compared to RPK + ECDHE
>>
>> + Extension - PSK Key Exchange Modes (6 bytes)
>>    00 2d 00 02 01 01
>>
>> + Extension - Pre Shared Key (51 bytes)
>>    00 29 00 2F
>>    00 0a 00 04 ID ID ID ID 00 00 00 00
>>    00 21 20 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>> - Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>>
>> - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>
>> - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>> 129 + 6 + 51 - 8 - 6 - 6 = 166 bytes
>>
>> ------------------------------------------------------
>> TLS 1.3 Flight #1 PSK
>> ------------------------------------------------------
>>
>> Differences compared to PSK + ECDHE
>>
>> - Extension - Supported Groups (x25519) (8 bytes)
>>
>> - Extension - Key Share (42 bytes)
>>
>> 166 - 8 - 42 = 116 bytes
>>
>>
>>
>> ======================================================
>> TLS 1.3 Flight #2  RPK + ECDHE
>> ======================================================
>>
>> Record Header - TLSPlaintext (5 bytes)
>> 16 03 03 LL LL
>>
>> 	Handshake Header - Server Hello (4 bytes)
>> 	02 LL LL LL
>>
>> 		Legacy Version (2 bytes)
>> 		fe fd
>>
>> 		Server Random (32 bytes)
>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>> 		Legacy Session ID (1 bytes)
>> 		00
>>
>> 		Cipher Suite (TLS_AES_128_CCM_8_SHA256) (2 bytes)
>> 		13 05
>>
>> 		Compression Method (null) (1 bytes)
>> 		00
>>
>> 		Extensions Length (2 bytes)
>> 		LL LL
>>
>> 			Extension - Key Share (40 bytes)
>> 			00 33 00 24 00 1d 00 20
>> 			00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>> 			Extension - Supported Versions (1.3) (6 bytes)
>> 			00 2b 00 02 03 04
>>
>> Record Header - TLSCiphertext (5 bytes)
>> 17 03 03 LL LL
>>
>> 	Handshake Header - Encrypted Extensions (4 bytes)
>> 	08 LL LL LL
>>
>> 		Extensions Length (2 bytes)
>> 		LL LL
>>
>> 			Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>> 			00 13 00 01 01 02
>>
>> 			Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>> 			00 14 00 01 01 02
>>
>> 	Handshake Header - Certificate Request (4 bytes)
>> 	0d LL LL LL
>>
>> 		Request Context (1 bytes)
>> 		00
>>
>> 		Extensions Length (2 bytes)
>> 		LL LL
>>
>> 			Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>> 			00 0d 00 04 00 02 08 07
>>
>> 	Handshake Header - Certificate (4 bytes)
>> 	0b LL LL LL
>>
>> 		Request Context (1 bytes)
>> 		00
>>
>> 		Certificate List Length (3 bytes)
>> 		LL LL LL
>>
>> 		Certificate Length (3 bytes)
>> 		LL LL LL
>>
>> 		Certificate (59 bytes) // Point compression
>> 		....
>>
>> 		Certificate Extensions (2 bytes)
>> 		00 00
>>
>> 	Handshake Header - Certificate Verify (4 bytes)
>> 	0f LL LL LL
>>
>> 		Signature  (68 bytes)
>> 		ZZ ZZ 00 40 ....
>>
>> 	Handshake Header - Finished (4 bytes)
>> 	14 LL LL LL
>>
>> 		Verify Data (32 bytes)
>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>> 	Record Type (1 byte)
>> 	16
>>
>> Auth Tag (8 bytes)
>> e0 8b 0e 45 5a 35 0a e5
>>
>> 5 + 90 + 5 + 18 + 15 + 72 + 72 + 36 + 1 + 8 = 322 bytes
>>
>> ------------------------------------------------------
>> TLS 1.3 Flight #2 PSK + ECDHE
>> ------------------------------------------------------
>>
>> Differences compared to RPK + ECDHE
>>
>> - Handshake Message Certificate (72 bytes)
>>
>> - Handshake Message CertificateVerify (72 bytes)
>>
>> - Handshake Message CertificateRequest (15 bytes)
>>
>> - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>
>> - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>> + Extension - Pre Shared Key (6 bytes)
>>    00 29 00 02 00 00
>>
>> 322 - 72 - 72 - 15 - 6 - 6  + 6 = 157 bytes
>>
>> ------------------------------------------------------
>> TLS 1.3 Flight #2 PSK
>> ------------------------------------------------------
>>
>> Differences compared to PSK + ECDHE
>>
>> - Extension - Key Share (40 bytes)
>>
>> 157 - 40 = 117 bytes
>>
>>
>>
>> ======================================================
>> TLS 1.3 Flight #3 RPK + ECDHE
>> ======================================================
>>
>> Record Header - TLSCiphertext (5 bytes)
>> 17 03 03 LL LL
>>
>> 	Handshake Header - Certificate (4 bytes)
>> 	0b LL LL LL
>>
>> 		Request Context (1 bytes)
>> 		00
>>
>> 		Certificate List Length (3 bytes)
>> 		LL LL LL
>>
>> 		Certificate Length (3 bytes)
>> 		LL LL LL
>> 	
>> 		Certificate (59 bytes) // Point compression
>> 		....
>>
>> 		Certificate Extensions (2 bytes)
>> 		00 00
>>
>> 	Handshake Header - Certificate Verify (4 bytes)
>> 	0f LL LL LL
>>
>> 		Signature  (68 bytes)
>> 		04 03 LL LL //ecdsa_secp256r1_sha256
>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>> 	Handshake Header - Finished (4 bytes)
>> 	14 LL LL LL
>>
>> 		Verify Data (32 bytes) // SHA-256
>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>> 	Record Type (1 byte)
>> 	16
>>
>> Auth Tag (8 bytes) // AES-CCM_8
>> 00 01 02 03 04 05 06 07
>>
>> 5 + 72 + 72 + 36 + 1 + 8 = 194 bytes
>>
>> ------------------------------------------------------
>> TLS 1.3 Flight #3 PSK + ECDHE
>> -----------------------------------------------------
>>
>> Differences compared to RPK + ECDHE
>>
>> - Handshake Message Certificate (72 bytes)
>>
>> - Handshake Message Certificate Verify (72 bytes)
>>
>> 194 - 72 - 72 = 50 bytes
>>
>> ------------------------------------------------------
>> TLS 1.3 Flight #3 PSK
>> -----------------------------------------------------
>>
>> Differences compared to PSK + ECDHE
>>
>> None
>>
>> 50 bytes
>>
>>
>> ﻿-----Original Message-----
>> From: Jim Schaad<ietf@augustcellars.com>
>> Date: Wednesday, 21 November 2018 at 16:25
>> To: John Mattsson<john.mattsson@ericsson.com>,"ace@ietf.org"  <ace@ietf.org>,"lwip@ietf.org"  <lwip@ietf.org>
>> Cc: 'Benjamin Kaduk'<kaduk@mit.edu>,"salvador.p.f@um.es"  <salvador.p.f@um.es>
>> Subject: RE: [Ace] EDHOC standardization
>>
>> John,
>>
>> In the analysis that I did I very deliberately used TLS not DTLS.  The main reason for using DTLS is because one is operating in the UDP environment and one cannot have reliable in order delivery.  Since EDHOC is being built on top of CoAP, one can use CoAP to create reliable in order delivery.  Thus the extra bytes that DTLS has to deal with this are not needed.
>>
>> Jim
>>
>>
>>> -----Original Message-----
>>> From: Ace<ace-bounces@ietf.org>  On Behalf Of John Mattsson
>>> Sent: Wednesday, November 21, 2018 7:03 AM
>>> To:ace@ietf.org;lwip@ietf.org
>>> Cc: Benjamin Kaduk<kaduk@mit.edu>;salvador.p.f@um.es
>>> Subject: Re: [Ace] EDHOC standardization
>>>
>>> Hi all,
>>>
>>> Inspired by the discussion in this thread, I did more detailed calculations of the
>>> number of bytes when DTLS 1.3 is used for typical IoT use cases (PSK, RPK,
>>> Connection ID). The plan is to add this information to draft-ietf-lwig-security-
>>> protocol-comparison as this has been requested by several people. I think some
>>> bytes were missing in the earlier estimates for TLS 1.3, and as Ben commented,
>>> DTLS 1.3 adds some bytes compared to TLS 1.3.
>>>
>>> ================================================================
>>> ==============
>>> Flight                                #1         #2        #3       Total
>>> ------------------------------------------------------------------------------
>>> DTLS 1.3 RPK + ECDHE                 149        373       213        735
>>> DTLS 1.3 PSK + ECDHE                 186        190        57        433
>>> DTLS 1.3 PSK                         136        150        57        343
>>> ------------------------------------------------------------------------------
>>> EDHOC    RPK + ECDHE                  38        121        86        245
>>> EDHOC    PSK + ECDHE                  43         47        12        102
>>> ================================================================
>>> ==============
>>>                                   Number of bytes
>>>
>>> Assumptions:
>>> - Minimum number of algorithms and cipher suites offered
>>> - Curve25519, ECDSA with P-256, AES-CCM_8, SHA-256
>>> - Length of key identifiers: 4 bytes
>>> - Connection identifiers: 1 byte
>>> - The DTLS RPKs use point compression (saves 32 bytes)
>>> - No DTLS handshake message fragmentation
>>> - Only mandatory DTLS extentions, except for connection ID
>>> - Version 30https://tools.ietf.org/html/draft-ietf-tls-dtls13-30
>>>
>>> (EDHOC numbers are for the soon to be published -11 version with cipher
>>> suites)
>>>
>>> I hope this information is useful for people. Please comment if I missed
>>> something or if you have any suggestion of things to add or how to present
>>> things. I do not know currently how these numbers compare to DTLS 1.2.
>>>
>>> Below is detailed information about where the byte in different flights as well
>>> as the RPKs (SubjectPublicKeyInfo). Most of the bytes should have the correct
>>> value, but most of the length fields are just written as LL LL LL. Below is also
>>> information about how resumption, cached information [RFC 7924], and not
>>> using Connection ID affects the number of bytes.
>>>
>>>
>>> ======================================================
>>> DTLS 1.3 Flight #1 RPK + ECDHE
>>> ======================================================
>>>
>>> Record Header - DTLSPlaintext (13 bytes)
>>> 16 fe fd EE EE SS SS SS SS SS SS LL LL
>>>
>>> 	Handshake Header - Client Hello (10 bytes)
>>> 	01 LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Legacy Version (2 bytes)
>>> 		fe fd
>>>
>>> 		Client Random (32 bytes)
>>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>> 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>>
>>> 		Legacy Session ID (1 bytes)
>>> 		00
>>>
>>> 		Cipher Suites (TLS_AES_128_CCM_8_SHA256) (4 bytes)
>>> 		00 02 13 05
>>>
>>> 		Compression Methods (null) (2 bytes)
>>> 		01 00
>>>
>>> 		Extensions Length (2 bytes)
>>> 		LL LL
>>>
>>> 			Extension - Supported Groups (x25519) (8 bytes)
>>> 			00 0a 00 04 00 02 00 1d
>>>
>>> 			Extension - Signature Algorithms
>>> (ecdsa_secp256r1_sha256) (8 bytes)
>>> 			00 0d 00 04 00 02 08 07
>>>
>>> 			Extension - Key Share (42 bytes)
>>> 			00 33 00 26 00 24 00 1d 00 20
>>> 			00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11
>>> 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>>
>>> 			Extension - Supported Versions (1.3) (7 bytes)
>>> 			00 2b 00 03 02 03 04
>>>
>>> 			Extension - Client Certificate Type (Raw Public Key) (6
>>> bytes)
>>> 			00 13 00 01 01 02
>>>
>>> 			Extension - Server Certificate Type (Raw Public Key) (6
>>> bytes)
>>> 			00 14 00 01 01 02
>>>
>>> 			Extension - Connection Identifier (43) (6 bytes)
>>> 			XX XX 00 02 01 42
>>>
>>> 13 + 10 + 2 + 32 + 1 + 4 + 2 + 2 + 8 + 8 + 42 + 7 + 6 + 6 + 6 = 149 bytes
>>>
>>> ------------------------------------------------------
>>> DTLS 1.3 Flight #1 PSK + ECDHE
>>> ------------------------------------------------------
>>>
>>> Differences compared to RPK + ECDHE
>>>
>>> + Extension - PSK Key Exchange Modes (6 bytes)
>>>    00 2d 00 02 01 01
>>>
>>> + Extension - Pre Shared Key (51 bytes)
>>>    00 29 00 2F
>>>    00 0a 00 04 ID ID ID ID 00 00 00 00
>>>    00 21 20 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15
>>> 16 17 18 19 1a 1b 1c 1d 1e 1f
>>>
>>> - Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>>>
>>> - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>>
>>> - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>>
>>> 149 + 6 + 51 - 8 - 6 - 6 = 186 bytes
>>>
>>> ------------------------------------------------------
>>> DTLS 1.3 Flight #1 PSK
>>> ------------------------------------------------------
>>>
>>> Differences compared to PSK + ECDHE
>>>
>>> - Extension - Supported Groups (x25519) (8 bytes)
>>>
>>> - Extension - Key Share (42 bytes)
>>>
>>> 186 - 8 - 42 = 136 bytes
>>>
>>>
>>>
>>> ======================================================
>>> DTLS 1.3 Flight #2  RPK + ECDHE
>>> ======================================================
>>>
>>> Record Header - DTLSPlaintext (13 bytes)
>>> 16 fe fd EE EE SS SS SS SS SS SS LL LL
>>>
>>> 	Handshake Header - Server Hello (10 bytes)
>>> 	02 LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Legacy Version (2 bytes)
>>> 		fe fd
>>>
>>> 		Server Random (32 bytes)
>>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>> 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>>
>>> 		Legacy Session ID (1 bytes)
>>> 		00
>>>
>>> 		Cipher Suite (TLS_AES_128_CCM_8_SHA256) (2 bytes)
>>> 		13 05
>>>
>>> 		Compression Method (null) (1 bytes)
>>> 		00
>>>
>>> 		Extensions Length (2 bytes)
>>> 		LL LL
>>>
>>> 			Extension - Key Share (40 bytes)
>>> 			00 33 00 24 00 1d 00 20
>>> 			00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11
>>> 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>>
>>> 			Extension - Supported Versions (1.3) (6 bytes)
>>> 			00 2b 00 02 03 04
>>>
>>> 			Extension - Connection Identifier (43) (6 bytes)
>>> 			XX XX 00 02 01 43
>>>
>>> Record Header - DTLSCiphertext, Full (6 bytes) HH ES SS 43 LL LL
>>>
>>> 	Handshake Header - Encrypted Extensions (10 bytes)
>>> 	08 LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Extensions Length (2 bytes)
>>> 		LL LL
>>>
>>> 			Extension - Client Certificate Type (Raw Public Key) (6
>>> bytes)
>>> 			00 13 00 01 01 02
>>>
>>> 			Extension - Server Certificate Type (Raw Public Key) (6
>>> bytes)
>>> 			00 14 00 01 01 02
>>>
>>> 	Handshake Header - Certificate Request (10 bytes)
>>> 	0d LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Request Context (1 bytes)
>>> 		00
>>>
>>> 		Extensions Length (2 bytes)
>>> 		LL LL
>>>
>>> 			Extension - Signature Algorithms
>>> (ecdsa_secp256r1_sha256) (8 bytes)
>>> 			00 0d 00 04 00 02 08 07
>>>
>>> 	Handshake Header - Certificate (10 bytes)
>>> 	0b LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Request Context (1 bytes)
>>> 		00
>>>
>>> 		Certificate List Length (3 bytes)
>>> 		LL LL LL
>>>
>>> 		Certificate Length (3 bytes)
>>> 		LL LL LL
>>>
>>> 		Certificate (59 bytes) // Point compression
>>> 		....
>>>
>>> 		Certificate Extensions (2 bytes)
>>> 		00 00
>>>
>>> 	Handshake Header - Certificate Verify (10 bytes)
>>> 	0f LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Signature  (68 bytes)
>>> 		ZZ ZZ 00 40 ....
>>>
>>> 	Handshake Header - Finished (10 bytes)
>>> 	14 LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Verify Data (32 bytes)
>>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>> 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>>
>>> 	Record Type (1 byte)
>>> 	16
>>>
>>> Auth Tag (8 bytes)
>>> e0 8b 0e 45 5a 35 0a e5
>>>
>>> 13 + 102 + 6 + 24 + 21 + 78 + 78 + 42 + 1 + 8 = 373 bytes
>>>
>>> ------------------------------------------------------
>>> DTLS 1.3 Flight #2 PSK + ECDHE
>>> ------------------------------------------------------
>>>
>>> Differences compared to RPK + ECDHE
>>>
>>> - Handshake Message Certificate (78 bytes)
>>>
>>> - Handshake Message CertificateVerify (78 bytes)
>>>
>>> - Handshake Message CertificateRequest (21 bytes)
>>>
>>> - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>>
>>> - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>>
>>> + Extension - Pre Shared Key (6 bytes)
>>>    00 29 00 02 00 00
>>>
>>> 373 - 78 - 78 - 21 - 6 - 6  + 6 = 190 bytes
>>>
>>> ------------------------------------------------------
>>> DTLS 1.3 Flight #2 PSK
>>> ------------------------------------------------------
>>>
>>> Differences compared to PSK + ECDHE
>>>
>>> - Extension - Key Share (40 bytes)
>>>
>>> 190 - 40 = 150 bytes
>>>
>>>
>>>
>>> ======================================================
>>> DTLS 1.3 Flight #3 RPK + ECDHE
>>> ======================================================
>>>
>>> Record Header (6 bytes) // DTLSCiphertext, Full ZZ ES SS 42 LL LL
>>>
>>> 	Handshake Header - Certificate (10 bytes)
>>> 	0b LL LL LL SS SS XX XX XX LL LL LL
>>>
>>> 		Request Context (1 bytes)
>>> 		00
>>>
>>> 		Certificate List Length (3 bytes)
>>> 		LL LL LL
>>>
>>> 		Certificate Length (3 bytes)
>>> 		LL LL LL
>>>
>>> 		Certificate (59 bytes) // Point compression
>>> 		....
>>>
>>> 		Certificate Extensions (2 bytes)
>>> 		00 00
>>>
>>> 	Handshake Header - Certificate Verify (10 bytes)
>>> 	0f LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Signature  (68 bytes)
>>> 		04 03 LL LL //ecdsa_secp256r1_sha256
>>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>> 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>> 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>>
>>> 	Handshake Header - Finished (10 bytes)
>>> 	14 LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Verify Data (32 bytes) // SHA-256
>>> 		00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>> 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>>
>>> 	Record Type (1 byte)
>>> 	16
>>>
>>> Auth Tag (8 bytes) // AES-CCM_8
>>> 00 01 02 03 04 05 06 07
>>>
>>> 6 + 78 + 78 + 42 + 1 + 8 = 213 bytes
>>>
>>> ------------------------------------------------------
>>> DTLS 1.3 Flight #3 PSK + ECDHE
>>> -----------------------------------------------------
>>>
>>> Differences compared to RPK + ECDHE
>>>
>>> - Handshake Message Certificate (78 bytes)
>>>
>>> - Handshake Message Certificate Verify (78 bytes)
>>>
>>> 213 - 78 - 78 = 57 bytes
>>>
>>> ------------------------------------------------------
>>> DTLS 1.3 Flight #3 PSK
>>> -----------------------------------------------------
>>>
>>> Differences compared to PSK + ECDHE
>>>
>>> None
>>>
>>> 57 bytes
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ======================================================
>>> DTLS 1.3 - Cached information [RFC 7924]
>>> ======================================================
>>>
>>> - Cached information together with server X.509 can be used to move bytes
>>> from flight #2 to flight #1
>>>    (cached RPK increases the number of bytes compared to cached X.509)
>>>
>>> Differences compared to RPK + ECDHE
>>>
>>> Flight #1
>>>
>>> - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>>
>>> + Extension - Client Cashed Information (39 bytes)
>>>    00 19 LL LL LL LL
>>>    01 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17
>>> 18 19 1a 1b 1c 1d 1e 1f
>>>
>>> 149 + 33 = 182 bytes
>>>
>>> Flight #2
>>>
>>> - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>>
>>> + Extension - Server Cashed Information (7 bytes)
>>>    00 19 LL LL LL LL 01
>>>
>>> - Server Certificate (59 bytes -> 32 bytes)
>>>
>>> 373 - 26 = 347 bytes
>>>
>>> ================================================================
>>> ==============
>>> Flight                                #1         #2        #3       Total
>>> ------------------------------------------------------------------------------
>>> DTLS 1.3 Cached X.509/RPK + ECDHE    182        347       213        742
>>> DTLS 1.3 RPK + ECDHE                 149        373       213        735
>>> ================================================================
>>> ==============
>>>
>>>
>>>
>>> ======================================================
>>> DTLS 1.3 - Resumption
>>> ======================================================
>>>
>>> To enable resumption, a 4th flight (New Session Ticket) is added
>>>
>>> Flight #4 - New Session Ticket
>>>
>>> Record Header - DTLSCiphertext, Full (6 bytes) HH ES SS 43 LL LL
>>>
>>> 	Handshake Header - New Session Ticket (10 bytes)
>>> 	04 LL LL LL SS SS 00 00 00 LL LL LL
>>>
>>> 		Ticket Lifetime (4 bytes)
>>> 		00 01 02 03
>>>
>>> 		Ticket Age Add (4 bytes)
>>> 		00 01 02 03
>>>
>>> 		Ticket Nonce (2 bytes)
>>> 		01 00
>>>
>>> 		Ticket (6 bytes)
>>> 		00 04 ID ID ID ID
>>>
>>> 		Extensions (2 bytes)
>>> 		00 00
>>>
>>> Auth Tag (8 bytes) // AES-CCM_8
>>> 00 01 02 03 04 05 06 07
>>>
>>> 6 + 10 + 4 + 4 + 2 + 6 + 2 + 8 = 42 bytes
>>>
>>> The resumption handshake is just a PSK handshake with 136 + 150 + 57 = 343
>>> bytes
>>>
>>> ================================================================
>>> ==============
>>> Flight                                      #1     #2     #3     #4    Total
>>> ------------------------------------------------------------------------------
>>> DTLS 1.3 RPK + ECDHE + NewSessionTicket    149    373    213     42      777
>>> DTLS 1.3 PSK (resumption)                  136    150     57             343
>>> ================================================================
>>> ==============
>>>
>>>
>>>
>>> ======================================================
>>> DTLS 1.3 - Connection ID
>>> ======================================================
>>>
>>> Without a Connection ID the DTLS 1.3 flight sizes changes as follows
>>>
>>> DTLS 1.3 Flight #1:   -6 bytes
>>> DTLS 1.3 Flight #2:   -7 bytes
>>> DTLS 1.3 Flight #3:   -1 byte
>>>
>>>
>>>
>>> ================================================================
>>> ==============
>>> Flight                                #1         #2        #3       Total
>>> ------------------------------------------------------------------------------
>>> DTLS 1.3 RPK + ECDHE (no cid)        143        364       212        721
>>> DTLS 1.3 PSK + ECDHE (no cid)        180        183        56        419
>>> DTLS 1.3 PSK (no cid)                130        143        56        329
>>> ================================================================
>>> ==============
>>>
>>>
>>>
>>>
>>>
>>> ======================================================
>>> DTLS Raw Public Keys
>>> ======================================================
>>>
>>> SubjectPublicKeyInfo without point compression
>>> -----------------------------------------------------
>>>
>>> 0x30 // Sequence
>>> 0x59 // Size 89
>>>
>>> 0x30 // Sequence
>>> 0x13 // Size 19
>>> 0x06 0x07 0x2A 0x86 0x48 0xCE 0x3D 0x02 0x01.     // OID 1.2.840.10045.2.1
>>> (ecPublicKey)
>>> 0x06 0x08 0x2A 0x86 0x48 0xCE 0x3D 0x03 0x01 0x07 // OID
>>> 1.2.840.10045.3.1.7 (secp256r1)
>>>
>>> 0x03 // Bit string
>>> 0x42 // Size 66
>>> 0x00 // Unused bits 0
>>> 0x04 // Uncompressed
>>> ...... 64 bytes X and Y
>>>
>>> Total of 91 bytes
>>>
>>> SubjectPublicKeyInfo with point compression
>>> -----------------------------------------------------
>>>
>>> 0x30 // Sequence
>>> 0x59 // Size 89
>>>
>>> 0x30 // Sequence
>>> 0x13 // Size 19
>>> 0x06 0x07 0x2A 0x86 0x48 0xCE 0x3D 0x02 0x01.     // OID 1.2.840.10045.2.1
>>> (ecPublicKey)
>>> 0x06 0x08 0x2A 0x86 0x48 0xCE 0x3D 0x03 0x01 0x07 // OID
>>> 1.2.840.10045.3.1.7 (secp256r1)
>>>
>>> 0x03 // Bit string
>>> 0x42 // Size 66
>>> 0x00 // Unused bits 0
>>> 0x03 // Compressed
>>> ...... 32 bytes X
>>>
>>> Total of 59 bytes
>>>
>>>
>>> ======================================================
>>> Helpful Sources of Information
>>> ======================================================
>>>
>>> In addition to relevant RFCs and the estimates done by Jim, the following
>>> references were helpful:
>>>
>>> Every Byte Explained: The Illustrated TLS 1.3 Connection
>>> https://tls13.ulfheim.net/
>>>
>>> Digital Certificates for the Internet of Thingshttps://kth.diva-
>>> portal.org/smash/get/diva2:1153958/FULLTEXT01.pdf
>>>
>>> /John
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: Benjamin Kaduk<kaduk@mit.edu>
>>> Date: Saturday, 3 November 2018 at 15:59
>>> To: John Mattsson<john.mattsson@ericsson.com>
>>> Cc:"salvador.p.f@um.es"  <salvador.p.f@um.es>,"ace@ietf.org"
>>> <ace@ietf.org>
>>> Subject: Re: [Ace] EDHOC standardization
>>>
>>> On Fri, Nov 02, 2018 at 02:55:54PM +0000, John Mattsson wrote:
>>>> Hi Benjamin, Salvador
>>>>
>>>> While DTLS 1.3 have done a very good job of lowering the overhead of the
>>> record layer when application data is sent (see e.g.
>>> https://tools.ietf.org/html/draft-ietf-lwig-security-protocol-comparison-01  for a
>>> comparison between different protocols), I do not think the handshake protocol
>>> is much leaner (is it leaner at all?).
>>>
>>> (There are some handshake messages that are removed entirely.)
>>>
>>>> We tried to make an fair comparison between EDHOC and TLS 1.3 in the
>>> presentation at IETF 101 (see
>>> https://datatracker.ietf.org/meeting/101/materials/slides-101-ace-key-
>>> exchange-w-oscore-00). Since then, we have significantly optimized the
>>> encoding in EDHOC and the upcoming version (-11) is expected to have the
>>> following message sizes.
>>>>     Auth.               PSK       RPK       x5t     x5chain
>>>>     --------------------------------------------------------------------
>>>>     EDHOC message_1      43        38        38        38
>>>>     EDHOC message_2      47       121       127       117 + Certificate chain
>>>>     EDHOC message_3      12        86        92        82 + Certificate chain
>>>>     --------------------------------------------------------------------
>>>>     Total               102       245       257       237 + Certificate chains
>>>>
>>>> As Salvador writes, the handshakes in TLS 1.3 and DTLS 1.3 are basically the
>>> same, so the numbers presented at IETF 101 should be a good estimate also for
>>> DTLS 1.3.
>>>>     Auth.                PSK       RPK
>>>>     --------------------------------------------------------------------
>>>>     (D)TLS message_1     142       107
>>>>     (D)TLS message_2     135       264
>>>>     (D)TLS message_3      51       167
>>>>     --------------------------------------------------------------------
>>>>     Total                328       538
>>> Thanks for the numbers!
>>>
>>>> The numbers above include ECDHE. For handshake messages, my
>>> understanding is that the DTLS 1.3 and TLS 1.3 record layer have exactly the
>>> same size.
>>>
>>> The DTLS 1.3 ones will be worse, due to the epoch and sequence number fields.
>>>
>>> -Ben
>>>
>>> _______________________________________________
>>> Ace mailing list
>>> Ace@ietf.org
>>> https://www.ietf.org/mailman/listinfo/ace
>> _______________________________________________
>> Lwip mailing list
>> Lwip@ietf.org
>> https://www.ietf.org/mailman/listinfo/lwip
>
>
> -- 
> email:rstruik.ext@gmail.com  | Skype: rstruik
> cell: +1 (647) 867-5658 | US: +1 (415) 690-7363


-- 
email: rstruik.ext@gmail.com | Skype: rstruik
cell: +1 (647) 867-5658 | US: +1 (415) 690-7363


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--------------B04393EF2D0D66BDCA363DFE--


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Date: Mon, 04 Mar 2019 17:59:29 -0500
From: "Martin Thomson" <mt@lowentropy.net>
To: secdispatch@ietf.org
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Subject: Re: [Secdispatch]  =?utf-8?q?Materials_for_Virtual_Interim_Meeting_on?= =?utf-8?q?_March-05-2019?=
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Hi Roman, Richard,

In reviewing the agenda for this, I realized that this might not be the ideal structure for this particular topic.

This structure is a fairly typical BoF structure for a topic that has a clear path forward, with a reasonably well-understood problem, what appears to be general agreement about how to approach the solution, and one clear candidate for a solution.  We go through that sort of process because it gives us the best chance of ending the meeting with a decision to form a working group around the proposed solution.  It effectively skips a bunch of the wrangling, which I'm sure we would all appreciate.

Going back to the usual set of questions:

1. What is the problem we are faced with?
2. Is the problem understood and narrowly scoped?
3. Do we believe it is possible to engineer a solution?
4. (stretch objective) Is this particular proposal a good basis for working on?

I don't see a whole lot of agreement about even the first question here.  The overwhelming impression you get from mail on the subject is that the primary concern here is the size of messages.  Recent mail from Hannes suggests that there might be a computation cost dimension as well.

The structure of the agenda is such that I don't feel like we'll get very far.  A lot of the time is spent in presentation (something I'm sure will keep me from falling asleep at 3am) of topics that don't directly bear on this particular problem.  In particular, the discussion of formal analysis of EDHOC is not going to help us reach any sort of consensus on the earlier questions as it relates directly to the third question.

Now, I'm sure that at least some of Goran's time will be spent addressing these important topics, I would like to see more time devoted to discussion of the hard questions and less on the "how do we get a working group chartered" end.  It seems like the agenda is specifically structured to presume an outcome on those foundational topics, and it is clear that no such presumption is safe.

Recent discussion leads me to conclude also that the final question might be contentious also, but that's probably a moot point.  I don't think that a mere 1.5 hour call will allow us to get into discussing solutions.

--Martin


On Fri, Mar 1, 2019, at 02:58, Roman Danyliw wrote:
> Hello!
> 
> As a reminder, SECDISPATCH will be meeting for a virtual interim 
> meeting on Tuesday, March 5, 2019.
> 
> ==[ Agenda ]==
> https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/materials/agenda-interim-2019-secdispatch-01-secdispatch-01.txt
> 
> ==[ Materials ]==
> https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/session/secdispatch
> 
> ==[ Dial-in Information ]==
> Meeting Link: 
> https://ietf.webex.com/ietf/j.php?MTID=m9c46ced5a864cc7a44ca4960e4fd6f0a
> 
> Meeting Number: 640 410 560
> Meeting Password: NMESeM7y 
> 
> Audio connection:
> ** 1-650-479-3208 Call-in toll number (US/Canada)
> ** Access code: 640 410 560
> 
> Regards,
> Roman and Richard
> 
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>


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From: Richard Barnes <rlb@ipv.sx>
Date: Mon, 4 Mar 2019 23:00:31 -0500
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Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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Hi G=C3=B6ran,

The idea of this "fTLS" construction is that it preserves the underlying
AKE that TLS uses.  The only difference is that:

1. The client/server random values are slightly smaller
2. The messages fed into the transcript are formatted slightly differently

The idea being that this protocol should preserve all of the security
properties that TLS has, with little or no modification to the prior proofs
of these properties.  I think this is what folks have had in mind when
calling for an alternative based on TLS.

--Richard


On Mon, Mar 4, 2019 at 2:27 PM G=C3=B6ran Selander <goran.selander@ericsson=
.com>
wrote:

> Hi Richard,
>
>
>
> I=E2=80=99m delighted to see that EDHOC has triggered people to start thi=
nking
> about reducing the overhead of the TLS 1.3 handshake, just like the messa=
ge
> size comparison between OSCORE and DTLS record layer resulted in the
> reduced overhead for the DTLS record layer.
>
>
>
> I understand this was an exercise in code size, but I=E2=80=99m confused =
about
> what is being implemented. This thread started out with an abstracted TLS
> 1.3, but if I understand right, what you are sketching here is a third
> protocol sharing some features of TLS 1.3 and some of EDHOC, but not
> compatible with any of them. If that is the case, then I think this has
> left the category =E2=80=9Ccurrent solutions=E2=80=9D and should be measu=
red with the same
> yardstick as EDHOC. Since the cryptographic protocol is not TLS 1.3, the
> security properties would need to be re-assessed. The message sizes are
> smaller than TLS 1.3 but larger than EDHOC. As for code size, the relevan=
t
> comparison is not standalone, but on top of an existing CoAP/OSCORE
> implementation.
>
>
>
> Continuing on this route you can come arbitrarily close to EDHOC, but can
> you do something that performs better?
>
>
>
> G=C3=B6ran
>
>
>
>
>
> *From: *Secdispatch <secdispatch-bounces@ietf.org> on behalf of Richard
> Barnes <rlb@ipv.sx>
> *Date: *Monday, 4 March 2019 at 13:12
> *To: *Jim Schaad <ietf@augustcellars.com>
> *Cc: *"secdispatch@ietf.org" <secdispatch@ietf.org>
> *Subject: *Re: [Secdispatch] DTLS - EDHOC <=3D 32
>
>
>
> Since you asked, I just went ahead and implemented a "femtoTLS" variant
> over the weekend.  It's about 420 lines of Go, leveraging some crypto
> routines and message formats from Mint.
>
>
>
> https://github.com/bifurcation/mint/compare/ftls
>
>
>
> The protocol outlined there is TLS 1.3, but with the ClientHello, Server
> Hello, and Certificate message replaced with smaller variants.  The messa=
ge
> sizes are as follows:
>
>
>
> m1 (ClientHello):  56
> m2 (ServerHello, Certificate, CertificateVerify, Finished) : 178
> m3 (Certificate, CertificateVerify, Finished): 125
>
>
>
> Just to highlight the framing / negotiation overhead:
>
>
>
> m1 =3D Random(16) + DH(32) + Overhead(8)
>
> m2 =3D Random(16) + DH(32) + SIG(64) + MAC(32) + TAG(16) + Overhead(18)
>
> m3 =3D SIG(64) + MAC(32) + TAG(16) + Overhead(13)
>
>
>
> The optimization here is pretty light; you could save a few more overhead
> octets if you were willing to special-case the syntax more.  Encoding in
> CBOR seems like it would probably produce results in the same ballpark.
>
>
>
> This also nicely highlights the crypto shortcuts that EDHOC is benefittin=
g
> from:
>
>
>
> - Omitting Random values in the first two messages
>
> - Relying on an AEAD tag instead of the Finished MAC
>
>
>
>
>
> On Sat, Mar 2, 2019 at 12:20 AM Jim Schaad <ietf@augustcellars.com> wrote=
:
>
> I have never done an implementation of TLS, about how many lines of code
> do you think it would be.  If you do all of the changes that would be
> necessary to scale things down you basically have a brand new code base i=
n
> any event..  I have done an implementation of EDHOC once upon a time so I
> have an idea of how big of a code base that is.
>
>
>
> Assume that crypto does not count as that would be the same for both
> implementations and is likely to be at least partly in hardware.
>
>
>
> Jim
>
>
>
>
>
> *From:* Richard Barnes <rlb@ipv.sx>
> *Sent:* Friday, March 1, 2019 8:13 PM
> *To:* Jim Schaad <ietf@augustcellars.com <ietf@augustcellars..com>>
> *Cc:* secdispatch@ietf.org
> *Subject:* Re: [Secdispatch] DTLS - EDHOC <=3D 32
>
>
>
> Fair point, Jim, but I don't think it actually matters -- you could just
> as well add key IDs to TLS, e.g., as a new certificate type (cf. RFC
> 7250).  So subtract the 32 bytes of PUBKEY from all accounts, and we're
> still at 32 bytes/message of difference.
>
>
>
> --Richard
>
>
>
> On Fri, Mar 1, 2019 at 6:23 PM Jim Schaad <ietf@augustcellars.com
> <ietf@augustcellars..com>> wrote:
>
> Richard,
>
>
>
> You incorrectly translated the EDHOC protocol below.
>
>
>
> Jim
>
>
>
>
>
> *From:* Secdispatch <secdispatch-bounces@ietf.org> *On Behalf Of *Richard
> Barnes
> *Sent:* Friday, March 1, 2019 9:09 AM
> *To:* secdispatch@ietf.org
> *Subject:* [Secdispatch] DTLS - EDHOC <=3D 32
>
>
>
> Hey folks,
>
>
>
> To try to understand the size arguments w.r..t. EDHOC / DTLS, I sat down
> and tried to lower-bound the size of the messages in each protocol.  The
> theory I'm using here is: The only things that really need to be in these
> protocols are the crypto variables.  Everything else is just a matter of
> encoding or pre-negotiation.  Under that theory, consider the following
> cartoon sketches of the two protocols in the full handshake, mutually
> authenticated with asymmetric keys, including minimum sizes in octets
> assuming a 128-bit security level:
>
>
>
> DTLS 1.3 (mutually authenticated):
>
> 1. C->S: DH (32)
>
> 2. S->C: DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32 + 64 + 32 + 16)
>
> 3. C->S: PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16)
>
>
>
> EDHOC:
>
> 1. C->S: DH (32)
>
> 2. S->C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 + 16)
>
>    2.  S->C: DH, SIG, TAG (112 =3D 32 + 64 + 16)
>
> 3. C->S: PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)
>
>     2. C->S: SIG, Tag (80 =3D 64+16)
>
>
>
> EDHOC is defined to send a key identifier rather than a key.
>
>
>
> The conclusions I draw from this (assuming the above summary is correct):
>
>
>
> 1. The size estimates in the EDHOC draft cannot be correct.  On the one
> hand, the EDHOC estimates for messages 2 and 3 are all below the above
> minimums..  On the other hand, the DTLS size estimates indicate a not ver=
y
> aggressive optimization, since they are all well above these minimums.
>
>
>
> 2. The difference between EDHOC and DTLS is at most 32 octets.  Whatever
> encoding you adopt for EDHOC, it can be translated to DTLS at a cost of 3=
2
> octets.  Difference is therefore 64 at most 64 octets based on just that
> data.
>
>
>
> 3. The primary driver of the size difference between EDHOC and DTLS is th=
e
> DTLS Finished MAC.
>
>
>
> Basically, EDHOC claims they can get away without the Finished MAC becaus=
e
> the correct stuff is covered under the AEAD tag.  However, if this approa=
ch
> is correct, then you could also "virtualize" the DTLS Finished MAC by
> having the peers include it in the AEAD calculation, but strip it from
> what's sent on the wire.  In either case, fresh analysis is needed.  But =
an
> analysis of DTLS with a virtualized MAC seems much simpler and more focus=
ed
> than starting from scratch.
>
>
>
> Hope folks find this helpful.
>
>
>
> --Richard
>
>

--00000000000062b3ed058350ebcb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi G=C3=B6ran,</div><div><br></div><div>The idea of t=
his &quot;fTLS&quot; construction is that it preserves the underlying AKE t=
hat TLS uses.=C2=A0 The only difference is that:</div><div><br></div><div>1=
. The client/server random values are slightly smaller<br></div><div>2. The=
 messages fed into the transcript are formatted slightly differently<br></d=
iv><div><br></div><div>The idea being that this protocol should preserve al=
l of the security properties that TLS has, with little or no modification t=
o the prior proofs of these properties.=C2=A0 I think this is what folks ha=
ve had in mind when calling for an alternative based on TLS.<br></div><div>=
<br></div><div>--Richard<br></div><div><br></div></div><br><div class=3D"gm=
ail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Mar 4, 2019 at 2:2=
7 PM G=C3=B6ran Selander &lt;<a href=3D"mailto:goran.selander@ericsson.com"=
>goran.selander@ericsson.com</a>&gt; wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex">





<div lang=3D"SV">
<div class=3D"gmail-m_3213289715386425880WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Richard,<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I=E2=80=99m delighted to see th=
at EDHOC has triggered people to start thinking about reducing the overhead=
 of the TLS 1.3 handshake, just like the message size comparison between OS=
CORE and DTLS record layer resulted in the reduced
 overhead for the DTLS record layer. <u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I understand this was an exerci=
se in code size, but I=E2=80=99m confused about what is being implemented. =
This thread started out with an abstracted TLS 1.3, but if I understand rig=
ht, what you are sketching here is a third protocol
 sharing some features of TLS 1.3 and some of EDHOC, but not compatible wit=
h any of them. If that is the case, then I think this has left the category=
 =E2=80=9Ccurrent solutions=E2=80=9D and should be measured with the same y=
ardstick as EDHOC. Since the cryptographic protocol
 is not TLS 1.3, the security properties would need to be re-assessed. The =
message sizes are smaller than TLS 1.3 but larger than EDHOC. As for code s=
ize, the relevant comparison is not standalone, but on top of an existing C=
oAP/OSCORE implementation.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Continuing on this route you ca=
n come arbitrarily close to EDHOC, but can you do something that performs b=
etter?
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">G=C3=B6ran<u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border-color:rgb(181,196,223) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0cm 0cm"=
>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><b><span style=3D"font-si=
ze:12pt;color:black">From:
</span></b><span style=3D"font-size:12pt;color:black">Secdispatch &lt;<a hr=
ef=3D"mailto:secdispatch-bounces@ietf.org" target=3D"_blank">secdispatch-bo=
unces@ietf.org</a>&gt; on behalf of Richard Barnes &lt;rlb@ipv.sx&gt;<br>
<b>Date: </b>Monday, 4 March 2019 at 13:12<br>
<b>To: </b>Jim Schaad &lt;<a href=3D"mailto:ietf@augustcellars.com" target=
=3D"_blank">ietf@augustcellars.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:secdispatch@ietf.org" target=3D"_blank">=
secdispatch@ietf.org</a>&quot; &lt;<a href=3D"mailto:secdispatch@ietf.org" =
target=3D"_blank">secdispatch@ietf.org</a>&gt;<br>
<b>Subject: </b>Re: [Secdispatch] DTLS - EDHOC &lt;=3D 32<u></u><u></u></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Since you asked, I just w=
ent ahead and implemented a &quot;femtoTLS&quot; variant over the weekend.=
=C2=A0 It&#39;s about 420 lines of Go, leveraging some crypto routines and =
message formats from Mint.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><a href=3D"https://github=
.com/bifurcation/mint/compare/ftls" target=3D"_blank">https://github.com/bi=
furcation/mint/compare/ftls</a><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">The protocol outlined the=
re is TLS 1.3, but with the ClientHello, Server Hello, and Certificate mess=
age replaced with smaller variants.=C2=A0 The message sizes are as follows:=
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">m1 (ClientHello):=C2=A0 5=
6<br>
m2 (ServerHello, Certificate, CertificateVerify, Finished) : 178<br>
m3 (Certificate, CertificateVerify, Finished): 125 <u></u><u></u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Just to highlight the fra=
ming / negotiation overhead:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">m1 =3D Random(16) + DH(32=
) + Overhead(8)<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">m2 =3D Random(16) + DH(32=
) + SIG(64) + MAC(32) + TAG(16) + Overhead(18)<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">m3 =3D SIG(64) + MAC(32) =
+ TAG(16) + Overhead(13)<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">The optimization here is =
pretty light; you could save a few more overhead octets if you were willing=
 to special-case the syntax more.=C2=A0 Encoding in CBOR seems like it woul=
d probably produce results in the same
 ballpark.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">This also nicely highligh=
ts the crypto shortcuts that EDHOC is benefitting from:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">- Omitting Random values =
in the first two messages<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">- Relying on an AEAD tag =
instead of the Finished MAC<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">On Sat, Mar 2, 2019 at 12=
:20 AM Jim Schaad &lt;<a href=3D"mailto:ietf@augustcellars.com" target=3D"_=
blank">ietf@augustcellars.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">I have never done an implementation of TLS, about how =
many lines of code do you think it would be.=C2=A0 If you do all of the cha=
nges that would be necessary to scale things down you basically have a bran=
d new code base in any event..=C2=A0 I have
 done an implementation of EDHOC once upon a time so I have an idea of how =
big of a code base that is.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Assume that crypto does not count as that would be the=
 same for both implementations and is likely to be at least partly in hardw=
are.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Jim<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div style=3D"border-style:none none none solid;border-width:medium medium =
medium 1.5pt;padding:0cm 0cm 0cm 4pt;border-color:currentcolor currentcolor=
 currentcolor blue">
<div>
<div style=3D"border-style:solid none none;border-width:1pt medium medium;p=
adding:3pt 0cm 0cm;border-color:currentcolor">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> Richard Barne=
s &lt;rlb@ipv.sx&gt;
<br>
<b>Sent:</b> Friday, March 1, 2019 8:13 PM<br>
<b>To:</b> Jim Schaad &lt;<a href=3D"mailto:ietf@augustcellars..com" target=
=3D"_blank">ietf@augustcellars.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:secdispatch@ietf.org" target=3D"_blank">secdis=
patch@ietf.org</a><br>
<b>Subject:</b> Re: [Secdispatch] DTLS - EDHOC &lt;=3D 32<u></u><u></u></sp=
an></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Fair point, Jim, but I don&#39;t think it actually mat=
ters -- you could just as well add key IDs to TLS, e.g., as a new certifica=
te type (cf. RFC 7250).=C2=A0 So subtract the 32 bytes of PUBKEY from all a=
ccounts, and we&#39;re still at 32 bytes/message
 of difference.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">--Richard<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">On Fri, Mar 1, 2019 at 6:23 PM Jim Schaad &lt;<a href=
=3D"mailto:ietf@augustcellars..com" target=3D"_blank">ietf@augustcellars.co=
m</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-style:none none none solid;border-width:medium =
medium medium 1pt;padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt 4.8pt;border-c=
olor:currentcolor currentcolor currentcolor rgb(204,204,204)">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Richard,<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">You incorrectly translated the EDHOC protocol below.<u=
></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Jim<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div style=3D"border-style:none none none solid;border-width:medium medium =
medium 1.5pt;padding:0cm 0cm 0cm 4pt;border-color:currentcolor currentcolor=
 currentcolor blue">
<div>
<div style=3D"border-style:solid none none;border-width:1pt medium medium;p=
adding:3pt 0cm 0cm;border-color:currentcolor">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> Secdispatch &=
lt;<a href=3D"mailto:secdispatch-bounces@ietf.org" target=3D"_blank">secdis=
patch-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Richard Barnes<br>
<b>Sent:</b> Friday, March 1, 2019 9:09 AM<br>
<b>To:</b> <a href=3D"mailto:secdispatch@ietf.org" target=3D"_blank">secdis=
patch@ietf.org</a><br>
<b>Subject:</b> [Secdispatch] DTLS - EDHOC &lt;=3D 32<u></u><u></u></span><=
/p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Hey folks,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">To try to understand the size arguments w.r..t. EDHOC =
/ DTLS, I sat down and tried to lower-bound the size of the messages in eac=
h protocol.=C2=A0 The theory I&#39;m using here is: The only things that re=
ally need to be in these protocols are the
 crypto variables.=C2=A0 Everything else is just a matter of encoding or pr=
e-negotiation.=C2=A0 Under that theory, consider the following cartoon sket=
ches of the two protocols in the full handshake, mutually authenticated wit=
h asymmetric keys, including minimum sizes
 in octets assuming a 128-bit security level:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">DTLS 1.3 (mutually authenticated):<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">1. C-&gt;S: DH (32)<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">2. S-&gt;C: DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32=
 + 64 + 32 + 16)<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">3. C-&gt;S: PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 3=
2 + 16)<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">EDHOC:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">1. C-&gt;S: DH (32)<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">2. S-&gt;C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64=
 + 16)<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0=C2=A0 <span style=3D"color:red">2.=C2=A0 S-&gt;=
C: DH, SIG, TAG (112 =3D 32 + 64 + 16)</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">3. C-&gt;S: PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0=C2=A0 <span style=3D"color:red">=C2=A02. C-&gt;=
S: SIG, Tag (80 =3D 64+16)</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"color:red" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US">=
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"color:red" lang=3D"EN-US">EDHOC is defined to send a key ide=
ntifier rather than a key.</span><span lang=3D"EN-US"><u></u><u></u></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">The conclusions I draw from this (assuming the above s=
ummary is correct):<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">1. The size estimates in the EDHOC draft cannot be cor=
rect.=C2=A0 On the one hand, the EDHOC estimates for messages 2 and 3 are a=
ll below the above minimums..=C2=A0 On the other hand, the DTLS size estima=
tes indicate a not very aggressive optimization,
 since they are all well above these minimums.<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">2. The difference between EDHOC and DTLS is at most 32=
 octets.=C2=A0 Whatever encoding you adopt for EDHOC, it can be translated =
to DTLS at a cost of 32 octets.<span style=3D"color:red">=C2=A0 Difference =
is therefore 64 at most 64 octets based on just
 that data.</span><u></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">3. The primary driver of the size difference between E=
DHOC and DTLS is the DTLS Finished MAC.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Basically, EDHOC claims they can get away without the =
Finished MAC because the correct stuff is covered under the AEAD tag.=C2=A0=
 However, if this approach is correct, then you could also &quot;virtualize=
&quot; the DTLS Finished MAC by having the peers
 include it in the AEAD calculation, but strip it from what&#39;s sent on t=
he wire.=C2=A0 In either case, fresh analysis is needed.=C2=A0 But an analy=
sis of DTLS with a virtualized MAC seems much simpler and more focused than=
 starting from scratch.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Hope folks find this helpful.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">--Richard<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>

</blockquote></div>

--00000000000062b3ed058350ebcb--


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From: Richard Barnes <rlb@ipv.sx>
Date: Mon, 4 Mar 2019 23:41:20 -0500
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To: Martin Thomson <mt@lowentropy.net>
Cc: secdispatch@ietf.org
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Subject: Re: [Secdispatch] Materials for Virtual Interim Meeting on March-05-2019
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Hi Martin,

Thanks for the feedback on the agenda.  Your points go to the question of
what we expect to accomplish in this meeting.  Given the level of
contention, I agree with your assessment that we will be unlikely to get to
a concrete decision here, but I'm hopeful we can get some specificity as to
the parameters of the problem(s) and the solution approaches that are on
the table.  In the hope that that could set the stage for some more
decision-oriented discussion at the Prague meeting.

Given that, I would propose we refactor the agenda to focus on introducing
and discussing those topics:

- 5min chairs' intros
- 15min Problem Statement overview (G=C3=B6ran Selander)
- 15min Discussion of problem statement
- 15min Overview of the EDHOC approach (G=C3=B6ran selander)
- 15min Overview of the TLS-based approach (Jim Schaad)
- 20min Discussion of solution approaches
- 5min Wrap-up

Presenters, it would be even better if you could keep your intros to 10min
to allow for more discussion, and stick to the actionable points:

- Problem statement: What are the concrete problems being addressed, and
what are the quantitative bounds that a proposed solution would have to
meet?
- Solution approaches: What are the key differences from the current state
of the art?  What are you preserving; what are you changing?

Thanks,
--Richard



On Mon, Mar 4, 2019 at 5:59 PM Martin Thomson <mt@lowentropy.net> wrote:

> Hi Roman, Richard,
>
> In reviewing the agenda for this, I realized that this might not be the
> ideal structure for this particular topic.
>
> This structure is a fairly typical BoF structure for a topic that has a
> clear path forward, with a reasonably well-understood problem, what appea=
rs
> to be general agreement about how to approach the solution, and one clear
> candidate for a solution.  We go through that sort of process because it
> gives us the best chance of ending the meeting with a decision to form a
> working group around the proposed solution.  It effectively skips a bunch
> of the wrangling, which I'm sure we would all appreciate.
>
> Going back to the usual set of questions:
>
> 1. What is the problem we are faced with?
> 2. Is the problem understood and narrowly scoped?
> 3. Do we believe it is possible to engineer a solution?
> 4. (stretch objective) Is this particular proposal a good basis for
> working on?
>
> I don't see a whole lot of agreement about even the first question here.
> The overwhelming impression you get from mail on the subject is that the
> primary concern here is the size of messages.  Recent mail from Hannes
> suggests that there might be a computation cost dimension as well.
>
> The structure of the agenda is such that I don't feel like we'll get very
> far.  A lot of the time is spent in presentation (something I'm sure will
> keep me from falling asleep at 3am) of topics that don't directly bear on
> this particular problem.  In particular, the discussion of formal analysi=
s
> of EDHOC is not going to help us reach any sort of consensus on the earli=
er
> questions as it relates directly to the third question.
>
> Now, I'm sure that at least some of Goran's time will be spent addressing
> these important topics, I would like to see more time devoted to discussi=
on
> of the hard questions and less on the "how do we get a working group
> chartered" end.  It seems like the agenda is specifically structured to
> presume an outcome on those foundational topics, and it is clear that no
> such presumption is safe.
>
> Recent discussion leads me to conclude also that the final question might
> be contentious also, but that's probably a moot point.  I don't think tha=
t
> a mere 1.5 hour call will allow us to get into discussing solutions.
>
> --Martin
>
>
> On Fri, Mar 1, 2019, at 02:58, Roman Danyliw wrote:
> > Hello!
> >
> > As a reminder, SECDISPATCH will be meeting for a virtual interim
> > meeting on Tuesday, March 5, 2019.
> >
> > =3D=3D[ Agenda ]=3D=3D
> >
> https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/material=
s/agenda-interim-2019-secdispatch-01-secdispatch-01.txt
> >
> > =3D=3D[ Materials ]=3D=3D
> >
> https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/session/=
secdispatch
> >
> > =3D=3D[ Dial-in Information ]=3D=3D
> > Meeting Link:
> > https://ietf.webex.com/ietf/j.php?MTID=3Dm9c46ced5a864cc7a44ca4960e4fd6=
f0a
> >
> > Meeting Number: 640 410 560
> > Meeting Password: NMESeM7y
> >
> > Audio connection:
> > ** 1-650-479-3208 Call-in toll number (US/Canada)
> > ** Access code: 640 410 560
> >
> > Regards,
> > Roman and Richard
> >
> > _______________________________________________
> > Secdispatch mailing list
> > Secdispatch@ietf.org
> > https://www.ietf.org/mailman/listinfo/secdispatch
> >
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>

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<div dir=3D"ltr"><div>Hi Martin,</div><div><br></div><div>Thanks for the fe=
edback on the agenda.=C2=A0 Your points go to the question of what we expec=
t to accomplish in this meeting.=C2=A0 Given the level of contention, I agr=
ee with your assessment that we will be unlikely to get to a concrete decis=
ion here, but I&#39;m hopeful we can get some specificity as to the paramet=
ers of the problem(s) and the solution approaches that are on the table.=C2=
=A0 In the hope that that could set the stage for some more decision-orient=
ed discussion at the Prague meeting.</div><div><br></div><div>Given that, I=
 would propose we refactor the agenda to focus on introducing and discussin=
g those topics:<br></div><div><br></div><div>- 5min chairs&#39; intros<br><=
/div><div>- 15min Problem Statement overview (G=C3=B6ran Selander)</div><di=
v>- 15min Discussion of problem statement<br></div><div>- 15min Overview of=
 the EDHOC approach (G=C3=B6ran selander)<br></div><div>- 15min Overview of=
 the TLS-based approach (Jim Schaad)</div><div>- 20min Discussion of soluti=
on approaches</div><div>- 5min Wrap-up<br></div><div><br></div><div>Present=
ers, it would be even better if you could keep your intros to 10min to allo=
w for more discussion, and stick to the actionable points:</div><div><br></=
div><div>- Problem statement: What are the concrete problems being addresse=
d, and what are the quantitative bounds that a proposed solution would have=
 to meet?<br></div><div>- Solution approaches: What are the key differences=
 from the current state of the art?=C2=A0 What are you preserving; what are=
 you changing?<br></div><div><br></div><div>Thanks,</div><div>--Richard<br>=
</div><div><br></div><div><br></div></div><br><div class=3D"gmail_quote"><d=
iv dir=3D"ltr" class=3D"gmail_attr">On Mon, Mar 4, 2019 at 5:59 PM Martin T=
homson &lt;<a href=3D"mailto:mt@lowentropy.net" target=3D"_blank">mt@lowent=
ropy.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex">Hi Roman, Richard,<br>
<br>
In reviewing the agenda for this, I realized that this might not be the ide=
al structure for this particular topic.<br>
<br>
This structure is a fairly typical BoF structure for a topic that has a cle=
ar path forward, with a reasonably well-understood problem, what appears to=
 be general agreement about how to approach the solution, and one clear can=
didate for a solution.=C2=A0 We go through that sort of process because it =
gives us the best chance of ending the meeting with a decision to form a wo=
rking group around the proposed solution.=C2=A0 It effectively skips a bunc=
h of the wrangling, which I&#39;m sure we would all appreciate.<br>
<br>
Going back to the usual set of questions:<br>
<br>
1. What is the problem we are faced with?<br>
2. Is the problem understood and narrowly scoped?<br>
3. Do we believe it is possible to engineer a solution?<br>
4. (stretch objective) Is this particular proposal a good basis for working=
 on?<br>
<br>
I don&#39;t see a whole lot of agreement about even the first question here=
.=C2=A0 The overwhelming impression you get from mail on the subject is tha=
t the primary concern here is the size of messages.=C2=A0 Recent mail from =
Hannes suggests that there might be a computation cost dimension as well.<b=
r>
<br>
The structure of the agenda is such that I don&#39;t feel like we&#39;ll ge=
t very far.=C2=A0 A lot of the time is spent in presentation (something I&#=
39;m sure will keep me from falling asleep at 3am) of topics that don&#39;t=
 directly bear on this particular problem.=C2=A0 In particular, the discuss=
ion of formal analysis of EDHOC is not going to help us reach any sort of c=
onsensus on the earlier questions as it relates directly to the third quest=
ion.<br>
<br>
Now, I&#39;m sure that at least some of Goran&#39;s time will be spent addr=
essing these important topics, I would like to see more time devoted to dis=
cussion of the hard questions and less on the &quot;how do we get a working=
 group chartered&quot; end.=C2=A0 It seems like the agenda is specifically =
structured to presume an outcome on those foundational topics, and it is cl=
ear that no such presumption is safe.<br>
<br>
Recent discussion leads me to conclude also that the final question might b=
e contentious also, but that&#39;s probably a moot point.=C2=A0 I don&#39;t=
 think that a mere 1.5 hour call will allow us to get into discussing solut=
ions.<br>
<br>
--Martin<br>
<br>
<br>
On Fri, Mar 1, 2019, at 02:58, Roman Danyliw wrote:<br>
&gt; Hello!<br>
&gt; <br>
&gt; As a reminder, SECDISPATCH will be meeting for a virtual interim <br>
&gt; meeting on Tuesday, March 5, 2019.<br>
&gt; <br>
&gt; =3D=3D[ Agenda ]=3D=3D<br>
&gt; <a href=3D"https://datatracker.ietf.org/meeting/interim-2019-secdispat=
ch-01/materials/agenda-interim-2019-secdispatch-01-secdispatch-01.txt" rel=
=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/meeting/inte=
rim-2019-secdispatch-01/materials/agenda-interim-2019-secdispatch-01-secdis=
patch-01.txt</a><br>
&gt; <br>
&gt; =3D=3D[ Materials ]=3D=3D<br>
&gt; <a href=3D"https://datatracker.ietf.org/meeting/interim-2019-secdispat=
ch-01/session/secdispatch" rel=3D"noreferrer" target=3D"_blank">https://dat=
atracker.ietf.org/meeting/interim-2019-secdispatch-01/session/secdispatch</=
a><br>
&gt; <br>
&gt; =3D=3D[ Dial-in Information ]=3D=3D<br>
&gt; Meeting Link: <br>
&gt; <a href=3D"https://ietf.webex.com/ietf/j.php?MTID=3Dm9c46ced5a864cc7a4=
4ca4960e4fd6f0a" rel=3D"noreferrer" target=3D"_blank">https://ietf.webex.co=
m/ietf/j.php?MTID=3Dm9c46ced5a864cc7a44ca4960e4fd6f0a</a><br>
&gt; <br>
&gt; Meeting Number: 640 410 560<br>
&gt; Meeting Password: NMESeM7y <br>
&gt; <br>
&gt; Audio connection:<br>
&gt; ** 1-650-479-3208 Call-in toll number (US/Canada)<br>
&gt; ** Access code: 640 410 560<br>
&gt; <br>
&gt; Regards,<br>
&gt; Roman and Richard<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Secdispatch mailing list<br>
&gt; <a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@=
ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"n=
oreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispa=
tch</a><br>
&gt;<br>
<br>
_______________________________________________<br>
Secdispatch mailing list<br>
<a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@ietf.=
org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispatch</=
a><br>
</blockquote></div>

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From: Roman Danyliw <rdd@cert.org>
To: Richard Barnes <rlb@ipv.sx>
CC: Martin Thomson <mt@lowentropy.net>, "secdispatch@ietf.org" <secdispatch@ietf.org>
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Hi all!

On Mar 5, 2019, at 12:41 PM, Richard Barnes <rlb@ipv.sx<mailto:rlb@ipv.sx>>=
 wrote:

Hi Martin,

Thanks for the feedback on the agenda.  Your points go to the question of w=
hat we expect to accomplish in this meeting.  Given the level of contention=
, I agree with your assessment that we will be unlikely to get to a concret=
e decision here, but I'm hopeful we can get some specificity as to the para=
meters of the problem(s) and the solution approaches that are on the table.=
  In the hope that that could set the stage for some more decision-oriented=
 discussion at the Prague meeting.


I=92m not sure I know what this means as such a multi-stage process doesn=
=92t align with our dispatch process.

Roman


Given that, I would propose we refactor the agenda to focus on introducing =
and discussing those topics:

- 5min chairs' intros
- 15min Problem Statement overview (G=F6ran Selander)
- 15min Discussion of problem statement
- 15min Overview of the EDHOC approach (G=F6ran selander)
- 15min Overview of the TLS-based approach (Jim Schaad)
- 20min Discussion of solution approaches
- 5min Wrap-up

Presenters, it would be even better if you could keep your intros to 10min =
to allow for more discussion, and stick to the actionable points:

- Problem statement: What are the concrete problems being addressed, and wh=
at are the quantitative bounds that a proposed solution would have to meet?
- Solution approaches: What are the key differences from the current state =
of the art?  What are you preserving; what are you changing?

Thanks,
--Richard



On Mon, Mar 4, 2019 at 5:59 PM Martin Thomson <mt@lowentropy.net<mailto:mt@=
lowentropy.net>> wrote:
Hi Roman, Richard,

In reviewing the agenda for this, I realized that this might not be the ide=
al structure for this particular topic.

This structure is a fairly typical BoF structure for a topic that has a cle=
ar path forward, with a reasonably well-understood problem, what appears to=
 be general agreement about how to approach the solution, and one clear can=
didate for a solution.  We go through that sort of process because it gives=
 us the best chance of ending the meeting with a decision to form a working=
 group around the proposed solution.  It effectively skips a bunch of the w=
rangling, which I'm sure we would all appreciate.

Going back to the usual set of questions:

1. What is the problem we are faced with?
2. Is the problem understood and narrowly scoped?
3. Do we believe it is possible to engineer a solution?
4. (stretch objective) Is this particular proposal a good basis for working=
 on?

I don't see a whole lot of agreement about even the first question here..  =
The overwhelming impression you get from mail on the subject is that the pr=
imary concern here is the size of messages.  Recent mail from Hannes sugges=
ts that there might be a computation cost dimension as well.

The structure of the agenda is such that I don't feel like we'll get very f=
ar.  A lot of the time is spent in presentation (something I'm sure will ke=
ep me from falling asleep at 3am) of topics that don't directly bear on thi=
s particular problem.  In particular, the discussion of formal analysis of =
EDHOC is not going to help us reach any sort of consensus on the earlier qu=
estions as it relates directly to the third question.

Now, I'm sure that at least some of Goran's time will be spent addressing t=
hese important topics, I would like to see more time devoted to discussion =
of the hard questions and less on the "how do we get a working group charte=
red" end.  It seems like the agenda is specifically structured to presume a=
n outcome on those foundational topics, and it is clear that no such presum=
ption is safe.

Recent discussion leads me to conclude also that the final question might b=
e contentious also, but that's probably a moot point.  I don't think that a=
 mere 1.5 hour call will allow us to get into discussing solutions.

--Martin


On Fri, Mar 1, 2019, at 02:58, Roman Danyliw wrote:
> Hello!
>
> As a reminder, SECDISPATCH will be meeting for a virtual interim
> meeting on Tuesday, March 5, 2019.
>
> =3D=3D[ Agenda ]=3D=3D
> https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/material=
s/agenda-interim-2019-secdispatch-01-secdispatch-01.txt
>
> =3D=3D[ Materials ]=3D=3D
> https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/session/=
secdispatch
>
> =3D=3D[ Dial-in Information ]=3D=3D
> Meeting Link:
> https://ietf.webex.com/ietf/j.php?MTID=3Dm9c46ced5a864cc7a44ca4960e4fd6f0=
a
>
> Meeting Number: 640 410 560
> Meeting Password: NMESeM7y
>
> Audio connection:
> ** 1-650-479-3208 Call-in toll number (US/Canada)
> ** Access code: 640 410 560
>
> Regards,
> Roman and Richard
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org<mailto:Secdispatch@ietf.org>
> https://www.ietf.org/mailman/listinfo/secdispatch
>

_______________________________________________
Secdispatch mailing list
Secdispatch@ietf.org<mailto:Secdispatch@ietf.org>
https://www.ietf.org/mailman/listinfo/secdispatch
_______________________________________________
Secdispatch mailing list
Secdispatch@ietf.org<mailto:Secdispatch@ietf.org>
https://www.ietf.org/mailman/listinfo/secdispatch

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<div dir=3D"ltr">Hi all!</div>
<div dir=3D"ltr"><br>
On Mar 5, 2019, at 12:41 PM, Richard Barnes &lt;<a href=3D"mailto:rlb@ipv.s=
x">rlb@ipv.sx</a>&gt; wrote:<br>
<br>
</div>
<blockquote type=3D"cite">
<div dir=3D"ltr">
<div dir=3D"ltr">
<div>Hi Martin,</div>
<div><br>
</div>
<div>Thanks for the feedback on the agenda.&nbsp; Your points go to the que=
stion of what we expect to accomplish in this meeting.&nbsp; Given the leve=
l of contention, I agree with your assessment that we will be unlikely to g=
et to a concrete decision here, but I'm hopeful
 we can get some specificity as to the parameters of the problem(s) and the=
 solution approaches that are on the table.&nbsp; In the hope that that cou=
ld set the stage for some more decision-oriented discussion at the Prague m=
eeting.</div>
<div><br>
</div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>I=92m not sure I know what this means as such a multi-stage process do=
esn=92t align with our dispatch process.</div>
<div><br>
</div>
<div>Roman</div>
<div><br>
</div>
<br>
<blockquote type=3D"cite">
<div dir=3D"ltr">
<div dir=3D"ltr">
<div>Given that, I would propose we refactor the agenda to focus on introdu=
cing and discussing those topics:<br>
</div>
<div><br>
</div>
<div>- 5min chairs' intros<br>
</div>
<div>- 15min Problem Statement overview (G=F6ran Selander)</div>
<div>- 15min Discussion of problem statement<br>
</div>
<div>- 15min Overview of the EDHOC approach (G=F6ran selander)<br>
</div>
<div>- 15min Overview of the TLS-based approach (Jim Schaad)</div>
<div>- 20min Discussion of solution approaches</div>
<div>- 5min Wrap-up<br>
</div>
<div><br>
</div>
<div>Presenters, it would be even better if you could keep your intros to 1=
0min to allow for more discussion, and stick to the actionable points:</div=
>
<div><br>
</div>
<div>- Problem statement: What are the concrete problems being addressed, a=
nd what are the quantitative bounds that a proposed solution would have to =
meet?<br>
</div>
<div>- Solution approaches: What are the key differences from the current s=
tate of the art?&nbsp; What are you preserving; what are you changing?<br>
</div>
<div><br>
</div>
<div>Thanks,</div>
<div>--Richard<br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Mon, Mar 4, 2019 at 5:59 PM Martin=
 Thomson &lt;<a href=3D"mailto:mt@lowentropy.net" target=3D"_blank">mt@lowe=
ntropy.net</a>&gt; wrote:<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">
Hi Roman, Richard,<br>
<br>
In reviewing the agenda for this, I realized that this might not be the ide=
al structure for this particular topic.<br>
<br>
This structure is a fairly typical BoF structure for a topic that has a cle=
ar path forward, with a reasonably well-understood problem, what appears to=
 be general agreement about how to approach the solution, and one clear can=
didate for a solution.&nbsp; We go through
 that sort of process because it gives us the best chance of ending the mee=
ting with a decision to form a working group around the proposed solution.&=
nbsp; It effectively skips a bunch of the wrangling, which I'm sure we woul=
d all appreciate.<br>
<br>
Going back to the usual set of questions:<br>
<br>
1. What is the problem we are faced with?<br>
2. Is the problem understood and narrowly scoped?<br>
3. Do we believe it is possible to engineer a solution?<br>
4. (stretch objective) Is this particular proposal a good basis for working=
 on?<br>
<br>
I don't see a whole lot of agreement about even the first question here..&n=
bsp; The overwhelming impression you get from mail on the subject is that t=
he primary concern here is the size of messages.&nbsp; Recent mail from Han=
nes suggests that there might be a computation
 cost dimension as well.<br>
<br>
The structure of the agenda is such that I don't feel like we'll get very f=
ar.&nbsp; A lot of the time is spent in presentation (something I'm sure wi=
ll keep me from falling asleep at 3am) of topics that don't directly bear o=
n this particular problem.&nbsp; In particular,
 the discussion of formal analysis of EDHOC is not going to help us reach a=
ny sort of consensus on the earlier questions as it relates directly to the=
 third question.<br>
<br>
Now, I'm sure that at least some of Goran's time will be spent addressing t=
hese important topics, I would like to see more time devoted to discussion =
of the hard questions and less on the &quot;how do we get a working group c=
hartered&quot; end.&nbsp; It seems like the agenda
 is specifically structured to presume an outcome on those foundational top=
ics, and it is clear that no such presumption is safe.<br>
<br>
Recent discussion leads me to conclude also that the final question might b=
e contentious also, but that's probably a moot point.&nbsp; I don't think t=
hat a mere 1.5 hour call will allow us to get into discussing solutions.<br=
>
<br>
--Martin<br>
<br>
<br>
On Fri, Mar 1, 2019, at 02:58, Roman Danyliw wrote:<br>
&gt; Hello!<br>
&gt; <br>
&gt; As a reminder, SECDISPATCH will be meeting for a virtual interim <br>
&gt; meeting on Tuesday, March 5, 2019.<br>
&gt; <br>
&gt; =3D=3D[ Agenda ]=3D=3D<br>
&gt; <a href=3D"https://datatracker.ietf.org/meeting/interim-2019-secdispat=
ch-01/materials/agenda-interim-2019-secdispatch-01-secdispatch-01.txt" rel=
=3D"noreferrer" target=3D"_blank">
https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/materials/=
agenda-interim-2019-secdispatch-01-secdispatch-01.txt</a><br>
&gt; <br>
&gt; =3D=3D[ Materials ]=3D=3D<br>
&gt; <a href=3D"https://datatracker.ietf.org/meeting/interim-2019-secdispat=
ch-01/session/secdispatch" rel=3D"noreferrer" target=3D"_blank">
https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/session/se=
cdispatch</a><br>
&gt; <br>
&gt; =3D=3D[ Dial-in Information ]=3D=3D<br>
&gt; Meeting Link: <br>
&gt; <a href=3D"https://ietf.webex.com/ietf/j.php?MTID=3Dm9c46ced5a864cc7a4=
4ca4960e4fd6f0a" rel=3D"noreferrer" target=3D"_blank">
https://ietf.webex.com/ietf/j.php?MTID=3Dm9c46ced5a864cc7a44ca4960e4fd6f0a<=
/a><br>
&gt; <br>
&gt; Meeting Number: 640 410 560<br>
&gt; Meeting Password: NMESeM7y <br>
&gt; <br>
&gt; Audio connection:<br>
&gt; ** 1-650-479-3208 Call-in toll number (US/Canada)<br>
&gt; ** Access code: 640 410 560<br>
&gt; <br>
&gt; Regards,<br>
&gt; Roman and Richard<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Secdispatch mailing list<br>
&gt; <a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@=
ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"n=
oreferrer" target=3D"_blank">
https://www.ietf.org/mailman/listinfo/secdispatch</a><br>
&gt;<br>
<br>
_______________________________________________<br>
Secdispatch mailing list<br>
<a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@ietf.=
org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispatch</=
a><br>
</blockquote>
</div>
</div>
</blockquote>
<blockquote type=3D"cite">
<div dir=3D"ltr"><span>_______________________________________________</spa=
n><br>
<span>Secdispatch mailing list</span><br>
<span><a href=3D"mailto:Secdispatch@ietf.org">Secdispatch@ietf.org</a></spa=
n><br>
<span><a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch">https:/=
/www.ietf.org/mailman/listinfo/secdispatch</a></span><br>
</div>
</blockquote>
</body>
</html>

--_000_D8BC19D36FB943B78107BFA5DF97A1A6certorg_--


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Date: Tue, 05 Mar 2019 04:56:41 -0500
From: "Martin Thomson" <mt@lowentropy.net>
To: "Roman Danyliw" <rdd@cert.org>, "'Richard Barnes'" <rlb@ipv.sx>
Cc: "secdispatch@ietf.org" <secdispatch@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/8_bXhwiteyArXO8MyrcaMYlVj3g>
Subject: Re: [Secdispatch]  =?utf-8?q?Materials_for_Virtual_Interim_Meeting_on?= =?utf-8?q?_March-05-2019?=
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On Tue, Mar 5, 2019, at 18:24, Roman Danyliw wrote:
> I=E2=80=99m not sure I know what this means as such a multi-stage proc=
ess=20
> doesn=E2=80=99t align with our dispatch process.

I was only suggesting that we might benefit from greater clarity on the =
early steps here.  The decision to dispatch can come at any point, thoug=
h we need to get further through if we believe that dispatching is one o=
f the more advanced responses (like formation of a working group).  If t=
hat means that there is no positive outcome from this meeting in the sen=
se that a decision is made about dispatching, as Richard says, at least =
we might make progress on the foundational bits.

(The more I think about this, the more that I think a BoF is the right f=
ormat for this, but let's make the most of the time we have.)


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From: =?utf-8?B?R8O2cmFuIFNlbGFuZGVy?= <goran.selander@ericsson.com>
To: Rene Struik <rstruik.ext@gmail.com>, John Mattsson <john.mattsson@ericsson.com>
CC: "secdispatch@ietf.org" <secdispatch@ietf.org>, 'Benjamin Kaduk' <kaduk@mit.edu>, "ace@ietf.org" <ace@ietf.org>
Thread-Topic: (details on use case scenario?) Re: [Lwip] [Ace] EDHOC standardization
Thread-Index: AQHU0tUzmKd7qLDRs0yXrXayhiGvPKX8+/mA
Date: Tue, 5 Mar 2019 11:41:58 +0000
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Subject: Re: [Secdispatch] Materials for Virtual Interim Meeting on March-05-2019
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My co-chair has (correctly) pointed out to me that it is a bit late for
such a significant agenda change.   So consider my proposed agenda
withdrawn.

Sorry for the thrash.  I was trying to be productive on a trans-pacific
flight.  Next time, I=E2=80=99ll watch another movie instead!

=E2=80=94Richard

On Mon, Mar 4, 2019 at 20:41 Richard Barnes <rlb@ipv.sx> wrote:

> Hi Martin,
>
> Thanks for the feedback on the agenda.  Your points go to the question of
> what we expect to accomplish in this meeting.  Given the level of
> contention, I agree with your assessment that we will be unlikely to get =
to
> a concrete decision here, but I'm hopeful we can get some specificity as =
to
> the parameters of the problem(s) and the solution approaches that are on
> the table.  In the hope that that could set the stage for some more
> decision-oriented discussion at the Prague meeting.
>
> Given that, I would propose we refactor the agenda to focus on introducin=
g
> and discussing those topics:
>
> - 5min chairs' intros
> - 15min Problem Statement overview (G=C3=B6ran Selander)
> - 15min Discussion of problem statement
> - 15min Overview of the EDHOC approach (G=C3=B6ran selander)
> - 15min Overview of the TLS-based approach (Jim Schaad)
> - 20min Discussion of solution approaches
> - 5min Wrap-up
>
> Presenters, it would be even better if you could keep your intros to 10mi=
n
> to allow for more discussion, and stick to the actionable points:
>
> - Problem statement: What are the concrete problems being addressed, and
> what are the quantitative bounds that a proposed solution would have to
> meet?
> - Solution approaches: What are the key differences from the current stat=
e
> of the art?  What are you preserving; what are you changing?
>
> Thanks,
> --Richard
>
>
>
> On Mon, Mar 4, 2019 at 5:59 PM Martin Thomson <mt@lowentropy.net> wrote:
>
>> Hi Roman, Richard,
>>
>> In reviewing the agenda for this, I realized that this might not be the
>> ideal structure for this particular topic.
>>
>> This structure is a fairly typical BoF structure for a topic that has a
>> clear path forward, with a reasonably well-understood problem, what appe=
ars
>> to be general agreement about how to approach the solution, and one clea=
r
>> candidate for a solution.  We go through that sort of process because it
>> gives us the best chance of ending the meeting with a decision to form a
>> working group around the proposed solution.  It effectively skips a bunc=
h
>> of the wrangling, which I'm sure we would all appreciate.
>>
>> Going back to the usual set of questions:
>>
>> 1. What is the problem we are faced with?
>> 2. Is the problem understood and narrowly scoped?
>> 3. Do we believe it is possible to engineer a solution?
>> 4. (stretch objective) Is this particular proposal a good basis for
>> working on?
>>
>> I don't see a whole lot of agreement about even the first question here.
>> The overwhelming impression you get from mail on the subject is that the
>> primary concern here is the size of messages.  Recent mail from Hannes
>> suggests that there might be a computation cost dimension as well.
>>
>> The structure of the agenda is such that I don't feel like we'll get ver=
y
>> far.  A lot of the time is spent in presentation (something I'm sure wil=
l
>> keep me from falling asleep at 3am) of topics that don't directly bear o=
n
>> this particular problem.  In particular, the discussion of formal analys=
is
>> of EDHOC is not going to help us reach any sort of consensus on the earl=
ier
>> questions as it relates directly to the third question.
>>
>> Now, I'm sure that at least some of Goran's time will be spent addressin=
g
>> these important topics, I would like to see more time devoted to discuss=
ion
>> of the hard questions and less on the "how do we get a working group
>> chartered" end.  It seems like the agenda is specifically structured to
>> presume an outcome on those foundational topics, and it is clear that no
>> such presumption is safe.
>>
>> Recent discussion leads me to conclude also that the final question migh=
t
>> be contentious also, but that's probably a moot point.  I don't think th=
at
>> a mere 1.5 hour call will allow us to get into discussing solutions.
>>
>> --Martin
>>
>>
>> On Fri, Mar 1, 2019, at 02:58, Roman Danyliw wrote:
>> > Hello!
>> >
>> > As a reminder, SECDISPATCH will be meeting for a virtual interim
>> > meeting on Tuesday, March 5, 2019.
>> >
>> > =3D=3D[ Agenda ]=3D=3D
>> >
>> https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/materia=
ls/agenda-interim-2019-secdispatch-01-secdispatch-01.txt
>> >
>> > =3D=3D[ Materials ]=3D=3D
>> >
>> https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/session=
/secdispatch
>> >
>> > =3D=3D[ Dial-in Information ]=3D=3D
>> > Meeting Link:
>> >
>> https://ietf.webex.com/ietf/j.php?MTID=3Dm9c46ced5a864cc7a44ca4960e4fd6f=
0a
>> >
>> > Meeting Number: 640 410 560
>> > Meeting Password: NMESeM7y
>> >
>> > Audio connection:
>> > ** 1-650-479-3208 Call-in toll number (US/Canada)
>> > ** Access code: 640 410 560
>> >
>> > Regards,
>> > Roman and Richard
>> >
>> > _______________________________________________
>> > Secdispatch mailing list
>> > Secdispatch@ietf.org
>> > https://www.ietf.org/mailman/listinfo/secdispatch
>> >
>>
>> _______________________________________________
>> Secdispatch mailing list
>> Secdispatch@ietf.org
>> https://www.ietf.org/mailman/listinfo/secdispatch
>>
>

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<div><div><div dir=3D"auto">My co-chair has (correctly) pointed out to me t=
hat it is a bit late for such a significant agenda change. =C2=A0 So consid=
er my proposed agenda withdrawn. =C2=A0</div><div dir=3D"auto"><br></div><d=
iv dir=3D"auto">Sorry for the thrash.=C2=A0 I was trying to be productive o=
n a trans-pacific flight.=C2=A0 Next time, I=E2=80=99ll watch another movie=
 instead!</div></div></div><div><div><div dir=3D"auto"><br></div><div dir=
=3D"auto">=E2=80=94Richard</div><br><div class=3D"gmail_quote"><div dir=3D"=
ltr" class=3D"gmail_attr">On Mon, Mar 4, 2019 at 20:41 Richard Barnes &lt;r=
lb@ipv.sx&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"lt=
r"><div>Hi Martin,</div><div><br></div><div>Thanks for the feedback on the =
agenda.=C2=A0 Your points go to the question of what we expect to accomplis=
h in this meeting.=C2=A0 Given the level of contention, I agree with your a=
ssessment that we will be unlikely to get to a concrete decision here, but =
I&#39;m hopeful we can get some specificity as to the parameters of the pro=
blem(s) and the solution approaches that are on the table.=C2=A0 In the hop=
e that that could set the stage for some more decision-oriented discussion =
at the Prague meeting.</div><div><br></div><div>Given that, I would propose=
 we refactor the agenda to focus on introducing and discussing those topics=
:<br></div><div><br></div><div>- 5min chairs&#39; intros<br></div><div>- 15=
min Problem Statement overview (G=C3=B6ran Selander)</div><div>- 15min Disc=
ussion of problem statement<br></div><div>- 15min Overview of the EDHOC app=
roach (G=C3=B6ran selander)<br></div><div>- 15min Overview of the TLS-based=
 approach (Jim Schaad)</div><div>- 20min Discussion of solution approaches<=
/div><div>- 5min Wrap-up<br></div><div><br></div><div>Presenters, it would =
be even better if you could keep your intros to 10min to allow for more dis=
cussion, and stick to the actionable points:</div><div><br></div><div>- Pro=
blem statement: What are the concrete problems being addressed, and what ar=
e the quantitative bounds that a proposed solution would have to meet?<br><=
/div><div>- Solution approaches: What are the key differences from the curr=
ent state of the art?=C2=A0 What are you preserving; what are you changing?=
<br></div><div><br></div><div>Thanks,</div><div>--Richard<br></div><div><br=
></div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr"=
 class=3D"gmail_attr">On Mon, Mar 4, 2019 at 5:59 PM Martin Thomson &lt;<a =
href=3D"mailto:mt@lowentropy.net" target=3D"_blank">mt@lowentropy.net</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Rom=
an, Richard,<br>
<br>
In reviewing the agenda for this, I realized that this might not be the ide=
al structure for this particular topic.<br>
<br>
This structure is a fairly typical BoF structure for a topic that has a cle=
ar path forward, with a reasonably well-understood problem, what appears to=
 be general agreement about how to approach the solution, and one clear can=
didate for a solution.=C2=A0 We go through that sort of process because it =
gives us the best chance of ending the meeting with a decision to form a wo=
rking group around the proposed solution.=C2=A0 It effectively skips a bunc=
h of the wrangling, which I&#39;m sure we would all appreciate.<br>
<br>
Going back to the usual set of questions:<br>
<br>
1. What is the problem we are faced with?<br>
2. Is the problem understood and narrowly scoped?<br>
3. Do we believe it is possible to engineer a solution?<br>
4. (stretch objective) Is this particular proposal a good basis for working=
 on?<br>
<br>
I don&#39;t see a whole lot of agreement about even the first question here=
.=C2=A0 The overwhelming impression you get from mail on the subject is tha=
t the primary concern here is the size of messages.=C2=A0 Recent mail from =
Hannes suggests that there might be a computation cost dimension as well.<b=
r>
<br>
The structure of the agenda is such that I don&#39;t feel like we&#39;ll ge=
t very far.=C2=A0 A lot of the time is spent in presentation (something I&#=
39;m sure will keep me from falling asleep at 3am) of topics that don&#39;t=
 directly bear on this particular problem.=C2=A0 In particular, the discuss=
ion of formal analysis of EDHOC is not going to help us reach any sort of c=
onsensus on the earlier questions as it relates directly to the third quest=
ion.<br>
<br>
Now, I&#39;m sure that at least some of Goran&#39;s time will be spent addr=
essing these important topics, I would like to see more time devoted to dis=
cussion of the hard questions and less on the &quot;how do we get a working=
 group chartered&quot; end.=C2=A0 It seems like the agenda is specifically =
structured to presume an outcome on those foundational topics, and it is cl=
ear that no such presumption is safe.<br>
<br>
Recent discussion leads me to conclude also that the final question might b=
e contentious also, but that&#39;s probably a moot point.=C2=A0 I don&#39;t=
 think that a mere 1.5 hour call will allow us to get into discussing solut=
ions.<br>
<br>
--Martin<br>
<br>
<br>
On Fri, Mar 1, 2019, at 02:58, Roman Danyliw wrote:<br>
&gt; Hello!<br>
&gt; <br>
&gt; As a reminder, SECDISPATCH will be meeting for a virtual interim <br>
&gt; meeting on Tuesday, March 5, 2019.<br>
&gt; <br>
&gt; =3D=3D[ Agenda ]=3D=3D<br>
&gt; <a href=3D"https://datatracker.ietf.org/meeting/interim-2019-secdispat=
ch-01/materials/agenda-interim-2019-secdispatch-01-secdispatch-01.txt" rel=
=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/meeting/inte=
rim-2019-secdispatch-01/materials/agenda-interim-2019-secdispatch-01-secdis=
patch-01.txt</a><br>
&gt; <br>
&gt; =3D=3D[ Materials ]=3D=3D<br>
&gt; <a href=3D"https://datatracker.ietf.org/meeting/interim-2019-secdispat=
ch-01/session/secdispatch" rel=3D"noreferrer" target=3D"_blank">https://dat=
atracker.ietf.org/meeting/interim-2019-secdispatch-01/session/secdispatch</=
a><br>
&gt; <br>
&gt; =3D=3D[ Dial-in Information ]=3D=3D<br>
&gt; Meeting Link: <br>
&gt; <a href=3D"https://ietf.webex.com/ietf/j.php?MTID=3Dm9c46ced5a864cc7a4=
4ca4960e4fd6f0a" rel=3D"noreferrer" target=3D"_blank">https://ietf.webex.co=
m/ietf/j.php?MTID=3Dm9c46ced5a864cc7a44ca4960e4fd6f0a</a><br>
&gt; <br>
&gt; Meeting Number: 640 410 560<br>
&gt; Meeting Password: NMESeM7y <br>
&gt; <br>
&gt; Audio connection:<br>
&gt; ** 1-650-479-3208 Call-in toll number (US/Canada)<br>
&gt; ** Access code: 640 410 560<br>
&gt; <br>
&gt; Regards,<br>
&gt; Roman and Richard<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Secdispatch mailing list<br>
&gt; <a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@=
ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"n=
oreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispa=
tch</a><br>
&gt;<br>
<br>
_______________________________________________<br>
Secdispatch mailing list<br>
<a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@ietf.=
org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispatch</=
a><br>
</blockquote></div>
</blockquote></div></div>
</div>

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From: Rene Struik <rstruik.ext@gmail.com>
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Subject: Re: [Secdispatch] [Ace] (details on use case scenario?) Re: [Lwip] EDHOC standardization
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Hi Goran:

Brief feedback below:


Something like this is briefly discussed under the benchmarking subject 
on today’s agenda, but with PSK/RPK ECHDE instead of certificates.

This is an excellent use case where message sizes is expected to have a 
large impact and simulations can be made, e.g. using 
https://bitbucket.org/6tisch/simulator/

RS>> My 10-hop enrollment use case was aimed to force consideration of 
not just abstract "protocol flow arrows", but also effects on the 
network and its actors. A simple byte-count is not enough...
<<RS


Some things cannot be compressed, like e.g. nonces, they can only be 
omitted by removing them at design time. Compression algorithms in 
themselves also add to the footprint. The approach of OSCORE and EDHOC 
has been to elide redundant information and define a compact format from 
the start. Do you think a lossless data compression performs better?

The other question I have is whether it would be more important to hide 
the identity of the joining node in a network enrollment scenario than 
to hide the network manager's identity, or the other way around.

There are different options to embed EDHOC in CoAP, the first request 
could be message_1 and the last response just an empty payload. Or the 
first request can be a trigger and message_1 carried in the first response.

RS>> If the first request is a trigger, one ends up with a four-pass 
protocol and might as well use the one I that allows parallel key 
computations and where all byte-counts could possibly fit within frames 
(see my message on "protocol flows" of October 31, 2018 and John 
Mattson's response hereto of Feb 19, 2019).
<<RS

On 3/5/2019 6:41 AM, Göran Selander wrote:
>
> Hi Rene,
>
> *From: *Rene Struik <rstruik.ext@gmail.com>
> *Date: *Monday, 4 March 2019 at 22:57
> *To: *John Mattsson <john.mattsson@ericsson.com>
> *Cc: *"secdispatch@ietf.org" <secdispatch@ietf.org>, Göran Selander 
> <goran.selander@ericsson.com>, 'Benjamin Kaduk' <kaduk@mit.edu>, 
> "ace@ietf.org" <ace@ietf.org>
> *Subject: *(details on use case scenario?) Re: [Lwip] [Ace] EDHOC 
> standardization
>
> Hi John, Goran:
>
> It is not easy to follow the discussion on EDHOC (except for 
> witnessing a byte-count slinging contest on the mailing list).
>
> I think it would be good to look at the big picture, i.e., which 
> problem does one solve and/or does one solve the right problem.
>
> I would like to understand somewhat better how the scheme suggested in 
> [1] could help in facilitating fast network enrollment and network  
> formation.
>
> Could you describe how to use this in the following scenario:
>
> 1) Network with one central manager and N=1,000 nodes that wish to 
> join the network roughly at the same time, where the network manager 
> is, say, 10 hops away from the joining nodes;
>
> 2) Authenticated key agreement using cert-based key agreement;
>
> 3) Network uses time-synchronized scheduling (such as in 6tisch) - 
> where local single-hop communication time latency is 10 seconds);
>
> 4) The network manager may have high-bandwidth with outside world, but 
> joining node/network manager path uses relatively low-bandwidth pipe 
> that may only be available intermittently, with preset schedule);
>
> 5) It is unknown beforehand which entry point the joining nodes will 
> pick when trying to enroll to the network?
>
> Something like this is briefly discussed under the benchmarking 
> subject on today’s agenda, but with PSK/RPK ECHDE instead of 
> certificates.
>
> This is an excellent use case where message sizes is expected to have 
> a large impact and simulations can be made, e.g. using 
> https://bitbucket.org/6tisch/simulator/
>
> While the draft refers to lots of details from other protocols that 
> are used under the hood, it would be good to abstract from this for 
> now and describe basics first.
>
> We have considered this. Our conclusion at the time was the having a 
> precise description of an abstract protocol, in addition to the 
> concrete mapping to COSE would perhaps be more confusing, and instead 
> we tried to introduce people to CBOR and COSE in Appendix A. 
> Considering the positive outcome from the CFRG Crypto Panel, I assume 
> the protocol is sufficient readable for review. Please let us know if 
> you have further issues reading it.
>
> I tend to agree with others that lossless data compression could 
> result in some savings, with some give and take re encoding rules (see 
> also [2]). Even if one finds a magic compression bullet at zero 
> incremental cost, though, the more important question is what problem 
> one solves and/or whether one solves the right problem. {As an aside, 
> 802.15.4 (which is the MAC with the 127-byte payload limit mentioned) 
> does not easily allow mixed secured/unsecured communications (but I do 
> not think it is useful to have a side-discussion on that detail right 
> now).}
>
> Some things cannot be compressed, like e.g. nonces, they can only be 
> omitted by removing them at design time. Compression algorithms in 
> themselves also add to the footprint. The approach of OSCORE and EDHOC 
> has been to elide redundant information and define a compact format 
> from the start. Do you think a lossless data compression performs better?
>
> The other question I have is whether it would be more important to 
> hide the identity of the joining node in a network enrollment scenario 
> than to hide the network manager's identity, or the other way around.
>
> There are different options to embed EDHOC in CoAP, the first request 
> could be message_1 and the last response just an empty payload. Or the 
> first request can be a trigger and message_1 carried in the first 
> response.
>
> Hope that helps,
>
> Göran
>
> From [1], Section 1.1:
>
> EDHOC is optimized for small message sizes and can therefore be sent 
> over a small number of radio frames. The message size of a key 
> exchange protocol may have a large impact on the performance of an IoT 
> deployment, especially in noisy environments. For example, in a 
> network bootstrapping setting a large number of devices turned on in a 
> short period of time may result in large latencies caused by parallel 
> key exchanges.
>
> Ref: [1] draft-selander-ace-cose-ecdhe-12
>
>         [2] Email RS as of October 31, 2018, 2.32pm EDT, subject: 
> https://mailarchive.ietf.org/arch/browse/ace/?q=struik
>
> On 11/22/2018 10:43 AM, Rene Struik wrote:
>
>     Hi John:
>
>     When comparing protocols, it would be useful to protocol flows
>     optimization, as follows:
>     a) optimized for parallelized online computations;
>     b) optimized for minimization of message flows.
>     See also slide 6 of my CFRG-83 presentation of March 30, 2012
>     (slides-83-cfrg-05 attached; I could not find CFRG records online).
>
>     The current draft-selander-ace-cose-ecdhe-10 document considers
>     optimization b), which minimizes the number of message flows, but
>     does require each party to compute the shared key consecutively,
>     rather than in parallel (as in optimization a).
>
>     With option a), if one really wishes to squeeze as much info into
>     a 128-octet datagram, one can already send A's ephemeral ECDSA
>     signature key in message flow 1, thereby cutting down the
>     size of the second message flow of the Sigma protocol depicted in
>     Fig. 1
>     (https://tools.ietf.org/html/draft-selander-ace-cose-ecdhe-10#page-11)
>     by 32 octets. This tackles the 120-octet byte count for the second
>     flow of Fig. 1 quite simply, while leading to a 4-pass protocol
>     flow (with roughly 70/70/55/55 bytes in flows 1/2/3/4).
>
>     Obviously, this presents a trade-off, but quite well be worth it
>     in settings where online key computations are quite slow on some
>     platforms and where scheduling (e.g., with TSCH) can now be done
>     with less consideration of the individual computational
>     capabilities of devices (since now one does not need to build-in a
>     worst-case 2 x "key computation back-off" for least capable
>     devices, but can just use the 1x contingency for this).
>
>     The parallel version is depicted below.
>
>     Party
>
>     U Party V | C_U, X_U, ALG_1, UAD_1, R_Sig(U;...) |
>     +--------------------------------------------------------------------->|
>     | message_1 | | | | C_U, C_V, X_V, ALG_2, R_Sig(V; ...) |
>     |<---------------------------------------------------------------------+
>     |
>
>     message_2 | | | | S_U, AEAD(K_3; ID_CRED_U, s_Sig(U; CRED_U,
>     aad_3), PAD_3) |
>     +--------------------------------------------------------------------->+
>     | message_3 |
>     |
>
>     | | S_V, AEAD(K_2;
>
>     ID_CRED_V, s_Sig(V; CRED_V, aad_2), UAD_2)| |
>     +<---------------------------------------------------------------------|
>     | message_4 |
>
>     ==============================================================================
>
>
>     Flight                                #1         #2        #3    #4    Total
>
>     ------------------------------------------------------------------------------
>
>     DTLS 1.3 RPK + ECDHE                 143        364       212     -     721
>
>     TLS 1.3  RPK + ECDHE                 129        322       194     -     645
>
>     EDHOC    RPK + ECDHE                  37        120        85     -     242
>
>     --> EDHOC parallel flow                 70         70        55     55    250
>
>     On 11/22/2018 7:23 AM, John Mattsson wrote:
>
>         Hi Jim,
>
>             In the analysis that I did I very deliberately used TLS not DTLS.  The main reason for using DTLS is because one is operating in the UDP environment and one cannot have reliable in order delivery.  Since EDHOC is being built on top of CoAP, one can use CoAP to create reliable in order delivery.  Thus, the extra bytes that DTLS has to deal with this are not needed.
>
>         I started with DTLS as that was what was discussion between Salvador and Benjamin. Below are numbers for TLS 1.3. Changes compared to DTLS 1.3 are that the record header is smaller, handshake headers are smaller, and that Connection ID is not supported in TLS 1.3. The numbers I get for TLS 1.3 are overall slightly bigger than the numbers in your estimate (but for PSK Flight #3 I get slightly smaller numbers). I think the difference is due to many smaller things like handshake headers and fields in the certificate structure that adds up. I plan to add TLS 1.3 numbers to draft-ietf-lwig-security-protocol-comparison as well.
>
>         I agree with your comment Jim. Just now, I am just trying to count the number of bytes of the security protocol. To do a fair comparison, you have to choose a specific deployment and look at the topology, the whole protocol stack, frame sizes (e.g. 128 bytes), how and where in the protocol stack fragmentation is done, and the expected packet loss. There is ongoing work on such simulations for 6tisch. Fragmentation and/or packet loss lead to the total number of bytes in the table below has to be multiplied by some linear factor. And as more bytes often lead to increased packet loss, you often see a non-linear relation between logical number of bytes on the transport/application layer as shown in the table below and physical number of bytes and/or time from completion of the protocol. Any realistic comparison over constrained radio would make the difference between TLS 1.3 and EDHOC larger. A problem with TLS is that it does not support Connection ID.
>
>         TLS Assumptions:
>
>         - Minimum number of algorithms and cipher suites offered
>
>         - Curve25519, ECDSA with P-256, AES-CCM_8, SHA-256
>
>         - Length of key identifiers: 4 bytes
>
>         - TLS RPK with point compression (saves 32 bytes)
>
>         - Only mandatory TLS extentions
>
>         ==============================================================================
>
>         Flight                                #1         #2        #3       Total
>
>         ------------------------------------------------------------------------------
>
>         DTLS 1.3 RPK + ECDHE                 143        364       212        721
>
>         TLS 1.3  RPK + ECDHE                 129        322       194        645
>
>         EDHOC    RPK + ECDHE                  37        120        85        242
>
>         ------------------------------------------------------------------------------
>
>         DTLS 1.3 PSK + ECDHE                 180        183        56        419
>
>         TLS 1.3  PSK + ECDHE                 166        157        50        373
>
>         EDHOC    PSK + ECDHE                  42         46        11         99
>
>         ------------------------------------------------------------------------------
>
>         DTLS 1.3 PSK                         130        143        56        329
>
>         TLS 1.3  PSK                         116        117        50        283
>
>         ==============================================================================
>
>                                  Number of bytes (No connection ID)
>
>         Below is detailed information about the different flights:
>
>         ======================================================
>
>         TLS 1.3 Flight #1 RPK + ECDHE
>
>         ======================================================
>
>         Record Header - TLSPlaintext (5 bytes)
>
>         16 03 03 LL LL
>
>               Handshake Header - Client Hello (4 bytes)
>
>               01 LL LL LL
>
>                       Legacy Version (2 bytes)
>
>                       03 03
>
>                       Client Random (32 bytes)
>
>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                       Legacy Session ID (1 bytes)
>
>                       00
>
>                       Cipher Suites (TLS_AES_128_CCM_8_SHA256) (4 bytes)
>
>                       00 02 13 05
>
>                       Compression Methods (null) (2 bytes)
>
>                       01 00
>
>                       Extensions Length (2 bytes)
>
>                       LL LL
>
>                              Extension - Supported Groups (x25519) (8 bytes)
>
>                              00 0a 00 04 00 02 00 1d
>
>                              Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>
>                              00 0d 00 04 00 02 08 07
>
>                              Extension - Key Share (42 bytes)
>
>                              00 33 00 26 00 24 00 1d 00 20
>
>                              00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                              Extension - Supported Versions (1.3) (7 bytes)
>
>                              00 2b 00 03 02 03 04
>
>                              Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>
>                              00 13 00 01 01 02
>
>                              Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>
>                              00 14 00 01 01 02
>
>         5 + 4 + 2 + 32 + 1 + 4 + 2 + 2 + 8 + 8 + 42 + 7 + 6 + 6 = 129 bytes
>
>         ------------------------------------------------------
>
>         TLS 1.3 Flight #1 PSK + ECDHE
>
>         ------------------------------------------------------
>
>         Differences compared to RPK + ECDHE
>
>         + Extension - PSK Key Exchange Modes (6 bytes)
>
>            00 2d 00 02 01 01
>
>         + Extension - Pre Shared Key (51 bytes)
>
>            00 29 00 2F
>
>            00 0a 00 04 ID ID ID ID 00 00 00 00
>
>            00 21 20 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>         - Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>
>         - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>
>         - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>
>         129 + 6 + 51 - 8 - 6 - 6 = 166 bytes
>
>         ------------------------------------------------------
>
>         TLS 1.3 Flight #1 PSK
>
>         ------------------------------------------------------
>
>         Differences compared to PSK + ECDHE
>
>         - Extension - Supported Groups (x25519) (8 bytes)
>
>         - Extension - Key Share (42 bytes)
>
>         166 - 8 - 42 = 116 bytes
>
>         ======================================================
>
>         TLS 1.3 Flight #2  RPK + ECDHE
>
>         ======================================================
>
>         Record Header - TLSPlaintext (5 bytes)
>
>         16 03 03 LL LL
>
>               Handshake Header - Server Hello (4 bytes)
>
>               02 LL LL LL
>
>                       Legacy Version (2 bytes)
>
>                       fe fd
>
>                       Server Random (32 bytes)
>
>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                       Legacy Session ID (1 bytes)
>
>                       00
>
>                       Cipher Suite (TLS_AES_128_CCM_8_SHA256) (2 bytes)
>
>                       13 05
>
>                       Compression Method (null) (1 bytes)
>
>                       00
>
>                       Extensions Length (2 bytes)
>
>                       LL LL
>
>                              Extension - Key Share (40 bytes)
>
>                              00 33 00 24 00 1d 00 20
>
>                              00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                              Extension - Supported Versions (1.3) (6 bytes)
>
>                              00 2b 00 02 03 04
>
>         Record Header - TLSCiphertext (5 bytes)
>
>         17 03 03 LL LL
>
>               Handshake Header - Encrypted Extensions (4 bytes)
>
>               08 LL LL LL
>
>                       Extensions Length (2 bytes)
>
>                       LL LL
>
>                              Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>
>                              00 13 00 01 01 02
>
>                              Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>
>                              00 14 00 01 01 02
>
>               Handshake Header - Certificate Request (4 bytes)
>
>               0d LL LL LL
>
>                       Request Context (1 bytes)
>
>                       00
>
>                       Extensions Length (2 bytes)
>
>                       LL LL
>
>                              Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>
>                              00 0d 00 04 00 02 08 07
>
>               Handshake Header - Certificate (4 bytes)
>
>               0b LL LL LL
>
>                       Request Context (1 bytes)
>
>                       00
>
>                       Certificate List Length (3 bytes)
>
>                       LL LL LL
>
>                       Certificate Length (3 bytes)
>
>                       LL LL LL
>
>                       Certificate (59 bytes) // Point compression
>
>                       ....
>
>                       Certificate Extensions (2 bytes)
>
>                       00 00
>
>               Handshake Header - Certificate Verify (4 bytes)
>
>               0f LL LL LL
>
>                       Signature  (68 bytes)
>
>                       ZZ ZZ 00 40 ....
>
>               Handshake Header - Finished (4 bytes)
>
>               14 LL LL LL
>
>                       Verify Data (32 bytes)
>
>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>               Record Type (1 byte)
>
>               16
>
>         Auth Tag (8 bytes)
>
>         e0 8b 0e 45 5a 35 0a e5
>
>         5 + 90 + 5 + 18 + 15 + 72 + 72 + 36 + 1 + 8 = 322 bytes
>
>         ------------------------------------------------------
>
>         TLS 1.3 Flight #2 PSK + ECDHE
>
>         ------------------------------------------------------
>
>         Differences compared to RPK + ECDHE
>
>         - Handshake Message Certificate (72 bytes)
>
>         - Handshake Message CertificateVerify (72 bytes)
>
>         - Handshake Message CertificateRequest (15 bytes)
>
>         - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>
>         - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>
>         + Extension - Pre Shared Key (6 bytes)
>
>            00 29 00 02 00 00
>
>         322 - 72 - 72 - 15 - 6 - 6  + 6 = 157 bytes
>
>         ------------------------------------------------------
>
>         TLS 1.3 Flight #2 PSK
>
>         ------------------------------------------------------
>
>         Differences compared to PSK + ECDHE
>
>         - Extension - Key Share (40 bytes)
>
>         157 - 40 = 117 bytes
>
>         ======================================================
>
>         TLS 1.3 Flight #3 RPK + ECDHE
>
>         ======================================================
>
>         Record Header - TLSCiphertext (5 bytes)
>
>         17 03 03 LL LL
>
>               Handshake Header - Certificate (4 bytes)
>
>               0b LL LL LL
>
>                       Request Context (1 bytes)
>
>                       00
>
>                       Certificate List Length (3 bytes)
>
>                       LL LL LL
>
>                       Certificate Length (3 bytes)
>
>                       LL LL LL
>
>               
>
>                       Certificate (59 bytes) // Point compression
>
>                       ....
>
>                       Certificate Extensions (2 bytes)
>
>                       00 00
>
>               Handshake Header - Certificate Verify (4 bytes)
>
>               0f LL LL LL
>
>                       Signature  (68 bytes)
>
>                       04 03 LL LL //ecdsa_secp256r1_sha256
>
>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>               Handshake Header - Finished (4 bytes)
>
>               14 LL LL LL
>
>                       Verify Data (32 bytes) // SHA-256
>
>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>               Record Type (1 byte)
>
>               16
>
>         Auth Tag (8 bytes) // AES-CCM_8
>
>         00 01 02 03 04 05 06 07
>
>         5 + 72 + 72 + 36 + 1 + 8 = 194 bytes
>
>         ------------------------------------------------------
>
>         TLS 1.3 Flight #3 PSK + ECDHE
>
>         -----------------------------------------------------
>
>         Differences compared to RPK + ECDHE
>
>         - Handshake Message Certificate (72 bytes)
>
>         - Handshake Message Certificate Verify (72 bytes)
>
>         194 - 72 - 72 = 50 bytes
>
>         ------------------------------------------------------
>
>         TLS 1.3 Flight #3 PSK
>
>         -----------------------------------------------------
>
>         Differences compared to PSK + ECDHE
>
>         None
>
>         50 bytes
>
>         -----Original Message-----
>
>         From: Jim Schaad<ietf@augustcellars.com>  <mailto:ietf@augustcellars.com>
>
>         Date: Wednesday, 21 November 2018 at 16:25
>
>         To: John Mattsson<john.mattsson@ericsson.com>  <mailto:john.mattsson@ericsson.com>,"ace@ietf.org"  <mailto:ace@ietf.org>  <ace@ietf.org>  <mailto:ace@ietf.org>,"lwip@ietf.org"  <mailto:lwip@ietf.org>  <lwip@ietf.org>  <mailto:lwip@ietf.org>
>
>         Cc: 'Benjamin Kaduk'<kaduk@mit.edu>  <mailto:kaduk@mit.edu>,"salvador.p.f@um.es"  <mailto:salvador.p.f@um.es>  <salvador.p.f@um.es>  <mailto:salvador.p.f@um.es>
>
>         Subject: RE: [Ace] EDHOC standardization
>
>         John,
>
>         In the analysis that I did I very deliberately used TLS not DTLS.  The main reason for using DTLS is because one is operating in the UDP environment and one cannot have reliable in order delivery.  Since EDHOC is being built on top of CoAP, one can use CoAP to create reliable in order delivery.  Thus the extra bytes that DTLS has to deal with this are not needed.
>
>         Jim
>
>             -----Original Message-----
>
>             From: Ace<ace-bounces@ietf.org>  <mailto:ace-bounces@ietf.org>  On Behalf Of John Mattsson
>
>             Sent: Wednesday, November 21, 2018 7:03 AM
>
>             To:ace@ietf.org  <mailto:ace@ietf.org>;lwip@ietf.org  <mailto:lwip@ietf.org>
>
>             Cc: Benjamin Kaduk<kaduk@mit.edu>  <mailto:kaduk@mit.edu>;salvador.p.f@um.es  <mailto:salvador.p.f@um.es>
>
>             Subject: Re: [Ace] EDHOC standardization
>
>             Hi all,
>
>             Inspired by the discussion in this thread, I did more detailed calculations of the
>
>             number of bytes when DTLS 1.3 is used for typical IoT use cases (PSK, RPK,
>
>             Connection ID). The plan is to add this information to draft-ietf-lwig-security-
>
>             protocol-comparison as this has been requested by several people. I think some
>
>             bytes were missing in the earlier estimates for TLS 1.3, and as Ben commented,
>
>             DTLS 1.3 adds some bytes compared to TLS 1.3.
>
>             ================================================================
>
>             ==============
>
>             Flight                                #1         #2        #3       Total
>
>             ------------------------------------------------------------------------------
>
>             DTLS 1.3 RPK + ECDHE                 149        373       213        735
>
>             DTLS 1.3 PSK + ECDHE                 186        190        57        433
>
>             DTLS 1.3 PSK                         136        150        57        343
>
>             ------------------------------------------------------------------------------
>
>             EDHOC    RPK + ECDHE                  38        121        86        245
>
>             EDHOC    PSK + ECDHE                  43         47        12        102
>
>             ================================================================
>
>             ==============
>
>                                               Number of bytes
>
>             Assumptions:
>
>             - Minimum number of algorithms and cipher suites offered
>
>             - Curve25519, ECDSA with P-256, AES-CCM_8, SHA-256
>
>             - Length of key identifiers: 4 bytes
>
>             - Connection identifiers: 1 byte
>
>             - The DTLS RPKs use point compression (saves 32 bytes)
>
>             - No DTLS handshake message fragmentation
>
>             - Only mandatory DTLS extentions, except for connection ID
>
>             - Version 30https://tools.ietf.org/html/draft-ietf-tls-dtls13-30
>
>             (EDHOC numbers are for the soon to be published -11 version with cipher
>
>             suites)
>
>             I hope this information is useful for people. Please comment if I missed
>
>             something or if you have any suggestion of things to add or how to present
>
>             things. I do not know currently how these numbers compare to DTLS 1.2.
>
>             Below is detailed information about where the byte in different flights as well
>
>             as the RPKs (SubjectPublicKeyInfo). Most of the bytes should have the correct
>
>             value, but most of the length fields are just written as LL LL LL. Below is also
>
>             information about how resumption, cached information [RFC 7924], and not
>
>             using Connection ID affects the number of bytes.
>
>             ======================================================
>
>             DTLS 1.3 Flight #1 RPK + ECDHE
>
>             ======================================================
>
>             Record Header - DTLSPlaintext (13 bytes)
>
>             16 fe fd EE EE SS SS SS SS SS SS LL LL
>
>                     Handshake Header - Client Hello (10 bytes)
>
>                     01 LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Legacy Version (2 bytes)
>
>                            fe fd
>
>                            Client Random (32 bytes)
>
>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>
>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                            Legacy Session ID (1 bytes)
>
>                            00
>
>                            Cipher Suites (TLS_AES_128_CCM_8_SHA256) (4 bytes)
>
>                            00 02 13 05
>
>                            Compression Methods (null) (2 bytes)
>
>                            01 00
>
>                            Extensions Length (2 bytes)
>
>                            LL LL
>
>                                    Extension - Supported Groups (x25519) (8 bytes)
>
>                                    00 0a 00 04 00 02 00 1d
>
>                                    Extension - Signature Algorithms
>
>             (ecdsa_secp256r1_sha256) (8 bytes)
>
>                                    00 0d 00 04 00 02 08 07
>
>                                    Extension - Key Share (42 bytes)
>
>                                    00 33 00 26 00 24 00 1d 00 20
>
>                                    00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11
>
>             12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                                    Extension - Supported Versions (1.3) (7 bytes)
>
>                                    00 2b 00 03 02 03 04
>
>                                    Extension - Client Certificate Type (Raw Public Key) (6
>
>             bytes)
>
>                                    00 13 00 01 01 02
>
>                                    Extension - Server Certificate Type (Raw Public Key) (6
>
>             bytes)
>
>                                    00 14 00 01 01 02
>
>                                    Extension - Connection Identifier (43) (6 bytes)
>
>                                    XX XX 00 02 01 42
>
>             13 + 10 + 2 + 32 + 1 + 4 + 2 + 2 + 8 + 8 + 42 + 7 + 6 + 6 + 6 = 149 bytes
>
>             ------------------------------------------------------
>
>             DTLS 1.3 Flight #1 PSK + ECDHE
>
>             ------------------------------------------------------
>
>             Differences compared to RPK + ECDHE
>
>             + Extension - PSK Key Exchange Modes (6 bytes)
>
>                00 2d 00 02 01 01
>
>             + Extension - Pre Shared Key (51 bytes)
>
>                00 29 00 2F
>
>                00 0a 00 04 ID ID ID ID 00 00 00 00
>
>                00 21 20 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15
>
>             16 17 18 19 1a 1b 1c 1d 1e 1f
>
>             - Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>
>             - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>
>             - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>
>             149 + 6 + 51 - 8 - 6 - 6 = 186 bytes
>
>             ------------------------------------------------------
>
>             DTLS 1.3 Flight #1 PSK
>
>             ------------------------------------------------------
>
>             Differences compared to PSK + ECDHE
>
>             - Extension - Supported Groups (x25519) (8 bytes)
>
>             - Extension - Key Share (42 bytes)
>
>             186 - 8 - 42 = 136 bytes
>
>             ======================================================
>
>             DTLS 1.3 Flight #2  RPK + ECDHE
>
>             ======================================================
>
>             Record Header - DTLSPlaintext (13 bytes)
>
>             16 fe fd EE EE SS SS SS SS SS SS LL LL
>
>                     Handshake Header - Server Hello (10 bytes)
>
>                     02 LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Legacy Version (2 bytes)
>
>                            fe fd
>
>                            Server Random (32 bytes)
>
>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>
>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                            Legacy Session ID (1 bytes)
>
>                            00
>
>                            Cipher Suite (TLS_AES_128_CCM_8_SHA256) (2 bytes)
>
>                            13 05
>
>                            Compression Method (null) (1 bytes)
>
>                            00
>
>                            Extensions Length (2 bytes)
>
>                            LL LL
>
>                                    Extension - Key Share (40 bytes)
>
>                                    00 33 00 24 00 1d 00 20
>
>                                    00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11
>
>             12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                                    Extension - Supported Versions (1.3) (6 bytes)
>
>                                    00 2b 00 02 03 04
>
>                                    Extension - Connection Identifier (43) (6 bytes)
>
>                                    XX XX 00 02 01 43
>
>             Record Header - DTLSCiphertext, Full (6 bytes) HH ES SS 43 LL LL
>
>                     Handshake Header - Encrypted Extensions (10 bytes)
>
>                     08 LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Extensions Length (2 bytes)
>
>                            LL LL
>
>                                    Extension - Client Certificate Type (Raw Public Key) (6
>
>             bytes)
>
>                                    00 13 00 01 01 02
>
>                                    Extension - Server Certificate Type (Raw Public Key) (6
>
>             bytes)
>
>                                    00 14 00 01 01 02
>
>                     Handshake Header - Certificate Request (10 bytes)
>
>                     0d LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Request Context (1 bytes)
>
>                            00
>
>                            Extensions Length (2 bytes)
>
>                            LL LL
>
>                                    Extension - Signature Algorithms
>
>             (ecdsa_secp256r1_sha256) (8 bytes)
>
>                                    00 0d 00 04 00 02 08 07
>
>                     Handshake Header - Certificate (10 bytes)
>
>                     0b LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Request Context (1 bytes)
>
>                            00
>
>                            Certificate List Length (3 bytes)
>
>                            LL LL LL
>
>                            Certificate Length (3 bytes)
>
>                            LL LL LL
>
>                            Certificate (59 bytes) // Point compression
>
>                            ....
>
>                            Certificate Extensions (2 bytes)
>
>                            00 00
>
>                     Handshake Header - Certificate Verify (10 bytes)
>
>                     0f LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Signature  (68 bytes)
>
>                            ZZ ZZ 00 40 ....
>
>                     Handshake Header - Finished (10 bytes)
>
>                     14 LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Verify Data (32 bytes)
>
>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>
>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                     Record Type (1 byte)
>
>                     16
>
>             Auth Tag (8 bytes)
>
>             e0 8b 0e 45 5a 35 0a e5
>
>             13 + 102 + 6 + 24 + 21 + 78 + 78 + 42 + 1 + 8 = 373 bytes
>
>             ------------------------------------------------------
>
>             DTLS 1.3 Flight #2 PSK + ECDHE
>
>             ------------------------------------------------------
>
>             Differences compared to RPK + ECDHE
>
>             - Handshake Message Certificate (78 bytes)
>
>             - Handshake Message CertificateVerify (78 bytes)
>
>             - Handshake Message CertificateRequest (21 bytes)
>
>             - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>
>             - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>
>             + Extension - Pre Shared Key (6 bytes)
>
>                00 29 00 02 00 00
>
>             373 - 78 - 78 - 21 - 6 - 6  + 6 = 190 bytes
>
>             ------------------------------------------------------
>
>             DTLS 1.3 Flight #2 PSK
>
>             ------------------------------------------------------
>
>             Differences compared to PSK + ECDHE
>
>             - Extension - Key Share (40 bytes)
>
>             190 - 40 = 150 bytes
>
>             ======================================================
>
>             DTLS 1.3 Flight #3 RPK + ECDHE
>
>             ======================================================
>
>             Record Header (6 bytes) // DTLSCiphertext, Full ZZ ES SS 42 LL LL
>
>                     Handshake Header - Certificate (10 bytes)
>
>                     0b LL LL LL SS SS XX XX XX LL LL LL
>
>                            Request Context (1 bytes)
>
>                            00
>
>                            Certificate List Length (3 bytes)
>
>                            LL LL LL
>
>                            Certificate Length (3 bytes)
>
>                            LL LL LL
>
>                            Certificate (59 bytes) // Point compression
>
>                            ....
>
>                            Certificate Extensions (2 bytes)
>
>                            00 00
>
>                     Handshake Header - Certificate Verify (10 bytes)
>
>                     0f LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Signature  (68 bytes)
>
>                            04 03 LL LL //ecdsa_secp256r1_sha256
>
>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>
>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>
>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                     Handshake Header - Finished (10 bytes)
>
>                     14 LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Verify Data (32 bytes) // SHA-256
>
>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>
>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>
>                     Record Type (1 byte)
>
>                     16
>
>             Auth Tag (8 bytes) // AES-CCM_8
>
>             00 01 02 03 04 05 06 07
>
>             6 + 78 + 78 + 42 + 1 + 8 = 213 bytes
>
>             ------------------------------------------------------
>
>             DTLS 1.3 Flight #3 PSK + ECDHE
>
>             -----------------------------------------------------
>
>             Differences compared to RPK + ECDHE
>
>             - Handshake Message Certificate (78 bytes)
>
>             - Handshake Message Certificate Verify (78 bytes)
>
>             213 - 78 - 78 = 57 bytes
>
>             ------------------------------------------------------
>
>             DTLS 1.3 Flight #3 PSK
>
>             -----------------------------------------------------
>
>             Differences compared to PSK + ECDHE
>
>             None
>
>             57 bytes
>
>             ======================================================
>
>             DTLS 1.3 - Cached information [RFC 7924]
>
>             ======================================================
>
>             - Cached information together with server X.509 can be used to move bytes
>
>             from flight #2 to flight #1
>
>                (cached RPK increases the number of bytes compared to cached X.509)
>
>             Differences compared to RPK + ECDHE
>
>             Flight #1
>
>             - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>
>             + Extension - Client Cashed Information (39 bytes)
>
>                00 19 LL LL LL LL
>
>                01 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17
>
>             18 19 1a 1b 1c 1d 1e 1f
>
>             149 + 33 = 182 bytes
>
>             Flight #2
>
>             - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>
>             + Extension - Server Cashed Information (7 bytes)
>
>                00 19 LL LL LL LL 01
>
>             - Server Certificate (59 bytes -> 32 bytes)
>
>             373 - 26 = 347 bytes
>
>             ================================================================
>
>             ==============
>
>             Flight                                #1         #2        #3       Total
>
>             ------------------------------------------------------------------------------
>
>             DTLS 1.3 Cached X.509/RPK + ECDHE    182        347       213        742
>
>             DTLS 1.3 RPK + ECDHE                 149        373       213        735
>
>             ================================================================
>
>             ==============
>
>             ======================================================
>
>             DTLS 1.3 - Resumption
>
>             ======================================================
>
>             To enable resumption, a 4th flight (New Session Ticket) is added
>
>             Flight #4 - New Session Ticket
>
>             Record Header - DTLSCiphertext, Full (6 bytes) HH ES SS 43 LL LL
>
>                     Handshake Header - New Session Ticket (10 bytes)
>
>                     04 LL LL LL SS SS 00 00 00 LL LL LL
>
>                            Ticket Lifetime (4 bytes)
>
>                            00 01 02 03
>
>                            Ticket Age Add (4 bytes)
>
>                            00 01 02 03
>
>                            Ticket Nonce (2 bytes)
>
>                            01 00
>
>                            Ticket (6 bytes)
>
>                            00 04 ID ID ID ID
>
>                            Extensions (2 bytes)
>
>                            00 00
>
>             Auth Tag (8 bytes) // AES-CCM_8
>
>             00 01 02 03 04 05 06 07
>
>             6 + 10 + 4 + 4 + 2 + 6 + 2 + 8 = 42 bytes
>
>             The resumption handshake is just a PSK handshake with 136 + 150 + 57 = 343
>
>             bytes
>
>             ================================================================
>
>             ==============
>
>             Flight                                      #1     #2     #3     #4    Total
>
>             ------------------------------------------------------------------------------
>
>             DTLS 1.3 RPK + ECDHE + NewSessionTicket    149    373    213     42      777
>
>             DTLS 1.3 PSK (resumption)                  136    150     57             343
>
>             ================================================================
>
>             ==============
>
>             ======================================================
>
>             DTLS 1.3 - Connection ID
>
>             ======================================================
>
>             Without a Connection ID the DTLS 1.3 flight sizes changes as follows
>
>             DTLS 1.3 Flight #1:   -6 bytes
>
>             DTLS 1.3 Flight #2:   -7 bytes
>
>             DTLS 1.3 Flight #3:   -1 byte
>
>             ================================================================
>
>             ==============
>
>             Flight                                #1         #2        #3       Total
>
>             ------------------------------------------------------------------------------
>
>             DTLS 1.3 RPK + ECDHE (no cid)        143        364       212        721
>
>             DTLS 1.3 PSK + ECDHE (no cid)        180        183        56        419
>
>             DTLS 1.3 PSK (no cid)                130        143        56        329
>
>             ================================================================
>
>             ==============
>
>             ======================================================
>
>             DTLS Raw Public Keys
>
>             ======================================================
>
>             SubjectPublicKeyInfo without point compression
>
>             -----------------------------------------------------
>
>             0x30 // Sequence
>
>             0x59 // Size 89
>
>             0x30 // Sequence
>
>             0x13 // Size 19
>
>             0x06 0x07 0x2A 0x86 0x48 0xCE 0x3D 0x02 0x01.     // OID 1.2.840.10045.2.1
>
>             (ecPublicKey)
>
>             0x06 0x08 0x2A 0x86 0x48 0xCE 0x3D 0x03 0x01 0x07 // OID
>
>             1.2.840.10045.3.1.7 (secp256r1)
>
>             0x03 // Bit string
>
>             0x42 // Size 66
>
>             0x00 // Unused bits 0
>
>             0x04 // Uncompressed
>
>             ...... 64 bytes X and Y
>
>             Total of 91 bytes
>
>             SubjectPublicKeyInfo with point compression
>
>             -----------------------------------------------------
>
>             0x30 // Sequence
>
>             0x59 // Size 89
>
>             0x30 // Sequence
>
>             0x13 // Size 19
>
>             0x06 0x07 0x2A 0x86 0x48 0xCE 0x3D 0x02 0x01.     // OID 1.2.840.10045.2.1
>
>             (ecPublicKey)
>
>             0x06 0x08 0x2A 0x86 0x48 0xCE 0x3D 0x03 0x01 0x07 // OID
>
>             1.2.840.10045.3.1.7 (secp256r1)
>
>             0x03 // Bit string
>
>             0x42 // Size 66
>
>             0x00 // Unused bits 0
>
>             0x03 // Compressed
>
>             ...... 32 bytes X
>
>             Total of 59 bytes
>
>             ======================================================
>
>             Helpful Sources of Information
>
>             ======================================================
>
>             In addition to relevant RFCs and the estimates done by Jim, the following
>
>             references were helpful:
>
>             Every Byte Explained: The Illustrated TLS 1.3 Connection
>
>             https://tls13.ulfheim.net/
>
>             Digital Certificates for the Internet of Thingshttps://kth.diva-
>
>             portal.org/smash/get/diva2:1153958/FULLTEXT01.pdf
>
>             /John
>
>             -----Original Message-----
>
>             From: Benjamin Kaduk<kaduk@mit.edu>  <mailto:kaduk@mit.edu>
>
>             Date: Saturday, 3 November 2018 at 15:59
>
>             To: John Mattsson<john.mattsson@ericsson.com>  <mailto:john.mattsson@ericsson.com>
>
>             Cc:"salvador.p.f@um.es"  <mailto:salvador.p.f@um.es>  <salvador.p.f@um.es>  <mailto:salvador.p.f@um.es>,"ace@ietf.org"  <mailto:ace@ietf.org>
>
>             <ace@ietf.org>  <mailto:ace@ietf.org>
>
>             Subject: Re: [Ace] EDHOC standardization
>
>             On Fri, Nov 02, 2018 at 02:55:54PM +0000, John Mattsson wrote:
>
>                 Hi Benjamin, Salvador
>
>                 While DTLS 1.3 have done a very good job of lowering the overhead of the
>
>             record layer when application data is sent (see e.g.
>
>             https://tools.ietf.org/html/draft-ietf-lwig-security-protocol-comparison-01  for a
>
>             comparison between different protocols), I do not think the handshake protocol
>
>             is much leaner (is it leaner at all?).
>
>             (There are some handshake messages that are removed entirely.)
>
>                 We tried to make an fair comparison between EDHOC and TLS 1.3 in the
>
>             presentation at IETF 101 (see
>
>             https://datatracker.ietf.org/meeting/101/materials/slides-101-ace-key-
>
>             exchange-w-oscore-00). Since then, we have significantly optimized the
>
>             encoding in EDHOC and the upcoming version (-11) is expected to have the
>
>             following message sizes.
>
>                     Auth.               PSK       RPK       x5t     x5chain
>
>                     --------------------------------------------------------------------
>
>                     EDHOC message_1      43        38        38        38
>
>                     EDHOC message_2      47       121       127       117 + Certificate chain
>
>                     EDHOC message_3      12        86        92        82 + Certificate chain
>
>                     --------------------------------------------------------------------
>
>                     Total               102       245       257       237 + Certificate chains
>
>                 As Salvador writes, the handshakes in TLS 1.3 and DTLS 1.3 are basically the
>
>             same, so the numbers presented at IETF 101 should be a good estimate also for
>
>             DTLS 1.3.
>
>                     Auth.                PSK       RPK
>
>                     --------------------------------------------------------------------
>
>                     (D)TLS message_1     142       107
>
>                     (D)TLS message_2     135       264
>
>                     (D)TLS message_3      51       167
>
>                     --------------------------------------------------------------------
>
>                     Total                328       538
>
>             Thanks for the numbers!
>
>                 The numbers above include ECDHE. For handshake messages, my
>
>             understanding is that the DTLS 1.3 and TLS 1.3 record layer have exactly the
>
>             same size.
>
>             The DTLS 1.3 ones will be worse, due to the epoch and sequence number fields.
>
>             -Ben
>
>             _______________________________________________
>
>             Ace mailing list
>
>             Ace@ietf.org  <mailto:Ace@ietf.org>
>
>             https://www.ietf.org/mailman/listinfo/ace
>
>         _______________________________________________
>
>         Lwip mailing list
>
>         Lwip@ietf.org  <mailto:Lwip@ietf.org>
>
>         https://www.ietf.org/mailman/listinfo/lwip
>
>     -- 
>
>     email:rstruik.ext@gmail.com  <mailto:rstruik.ext@gmail.com>  | Skype: rstruik
>
>     cell: +1 (647) 867-5658 | US: +1 (415) 690-7363
>
> -- 
> email:rstruik.ext@gmail.com  <mailto:rstruik.ext@gmail.com>  | Skype: rstruik
> cell: +1 (647) 867-5658 | US: +1 (415) 690-7363
>
> _______________________________________________
> Ace mailing list
> Ace@ietf.org
> https://www.ietf.org/mailman/listinfo/ace


-- 
email: rstruik.ext@gmail.com | Skype: rstruik
cell: +1 (647) 867-5658 | US: +1 (415) 690-7363


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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 5 Mar 2019 06:10:02 -0800
Message-ID: <CABcZeBNLiSL3_yZ0fffhT3NuA+87J0-92P4ioESzQZ95rmCkrQ@mail.gmail.com>
To: Richard Barnes <rlb@ipv.sx>
Cc: =?UTF-8?Q?G=C3=B6ran_Selander?= <goran.selander@ericsson.com>,  "secdispatch@ietf.org" <secdispatch@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/LAKfzXI51eXRi79sVwzpOWZp0K4>
Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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Hi folks,

While I think Richard's characterization of fTLS is strictly correct,
I agree you have to squint a bit to see that it's isomorphic to
TLS 1.3. In the spirit of clarity, I've put together the following
very rough draft:

   https://github.com/ekr/draft-rescorla-tls-ctls

This is a pretty straight compactification of TLS 1.3, which
gets you down to the following message sizes for each flight:

Flight 1:  59
Flight 2: 189
Flight 3: 127

I've verified the complicated pieces (CH and SH) with Mint, but I just
started on this last night, so I haven't quite gotten the other pieces
coded up, so there may be some small arithmetic errors. Apologies for
that in advance.

The basic approach here is to have more compact encodings of
everything and then to have some sensible defaults so you don't have
to transmit them. The vast majority of the data is in the "mandatory"
cryptographic material. I've chosen the following values:

- 16 byte randoms (matching fTLS)
- 32 byte Finished messages (matching TLS 1.3)
- 8 byte authentication tags (matching what EDHOC chose)
  If you want 16 bytes, add 8 to flights 2 and 3.

There are some obvious avenues to shave a few bytes here and there,
mostly because I did a sort of straight translation of TLS 1.3, so for
instance, there are empty EE and CR messages, and you could omit
length fields for some fixed-length or deterministic HS messages. I
didn't bother with this because it's more in the way of a POC and, as
Richard noted, most of the size difference between this and EDHOC is
the Randoms and the Finished.

-Ekr


On Mon, Mar 4, 2019 at 8:01 PM Richard Barnes <rlb@ipv.sx> wrote:

> Hi G=C3=B6ran,
>
> The idea of this "fTLS" construction is that it preserves the underlying
> AKE that TLS uses.  The only difference is that:
>
> 1.. The client/server random values are slightly smaller
> 2. The messages fed into the transcript are formatted slightly differentl=
y
>
> The idea being that this protocol should preserve all of the security
> properties that TLS has, with little or no modification to the prior proo=
fs
> of these properties.  I think this is what folks have had in mind when
> calling for an alternative based on TLS.
>
> --Richard
>
>
> On Mon, Mar 4, 2019 at 2:27 PM G=C3=B6ran Selander <goran.selander@ericss=
on.com>
> wrote:
>
>> Hi Richard,
>>
>>
>>
>> I=E2=80=99m delighted to see that EDHOC has triggered people to start th=
inking
>> about reducing the overhead of the TLS 1.3 handshake, just like the mess=
age
>> size comparison between OSCORE and DTLS record layer resulted in the
>> reduced overhead for the DTLS record layer.
>>
>>
>>
>> I understand this was an exercise in code size, but I=E2=80=99m confused=
 about
>> what is being implemented. This thread started out with an abstracted TL=
S
>> 1.3, but if I understand right, what you are sketching here is a third
>> protocol sharing some features of TLS 1.3 and some of EDHOC, but not
>> compatible with any of them. If that is the case, then I think this has
>> left the category =E2=80=9Ccurrent solutions=E2=80=9D and should be meas=
ured with the same
>> yardstick as EDHOC. Since the cryptographic protocol is not TLS 1.3, the
>> security properties would need to be re-assessed. The message sizes are
>> smaller than TLS 1.3 but larger than EDHOC. As for code size, the releva=
nt
>> comparison is not standalone, but on top of an existing CoAP/OSCORE
>> implementation.
>>
>>
>>
>> Continuing on this route you can come arbitrarily close to EDHOC, but ca=
n
>> you do something that performs better?
>>
>>
>>
>> G=C3=B6ran
>>
>>
>>
>>
>>
>> *From: *Secdispatch <secdispatch-bounces@ietf.org> on behalf of Richard
>> Barnes <rlb@ipv.sx>
>> *Date: *Monday, 4 March 2019 at 13:12
>> *To: *Jim Schaad <ietf@augustcellars.com>
>> *Cc: *"secdispatch@ietf.org" <secdispatch@ietf.org>
>> *Subject: *Re: [Secdispatch] DTLS - EDHOC <=3D 32
>>
>>
>>
>> Since you asked, I just went ahead and implemented a "femtoTLS" variant
>> over the weekend.  It's about 420 lines of Go, leveraging some crypto
>> routines and message formats from Mint.
>>
>>
>>
>> https://github.com/bifurcation/mint/compare/ftls
>> <https://github..com/bifurcation/mint/compare/ftls>
>>
>>
>>
>> The protocol outlined there is TLS 1.3, but with the ClientHello, Server
>> Hello, and Certificate message replaced with smaller variants.  The mess=
age
>> sizes are as follows:
>>
>>
>>
>> m1 (ClientHello):  56
>> m2 (ServerHello, Certificate, CertificateVerify, Finished) : 178
>> m3 (Certificate, CertificateVerify, Finished): 125
>>
>>
>>
>> Just to highlight the framing / negotiation overhead:
>>
>>
>>
>> m1 =3D Random(16) + DH(32) + Overhead(8)
>>
>> m2 =3D Random(16) + DH(32) + SIG(64) + MAC(32) + TAG(16) + Overhead(18)
>>
>> m3 =3D SIG(64) + MAC(32) + TAG(16) + Overhead(13)
>>
>>
>>
>> The optimization here is pretty light; you could save a few more overhea=
d
>> octets if you were willing to special-case the syntax more.  Encoding in
>> CBOR seems like it would probably produce results in the same ballpark.
>>
>>
>>
>> This also nicely highlights the crypto shortcuts that EDHOC is
>> benefitting from:
>>
>>
>>
>> - Omitting Random values in the first two messages
>>
>> - Relying on an AEAD tag instead of the Finished MAC
>>
>>
>>
>>
>>
>> On Sat, Mar 2, 2019 at 12:20 AM Jim Schaad <ietf@augustcellars.com>
>> wrote:
>>
>> I have never done an implementation of TLS, about how many lines of code
>> do you think it would be.  If you do all of the changes that would be
>> necessary to scale things down you basically have a brand new code base =
in
>> any event..  I have done an implementation of EDHOC once upon a time so =
I
>> have an idea of how big of a code base that is.
>>
>>
>>
>> Assume that crypto does not count as that would be the same for both
>> implementations and is likely to be at least partly in hardware.
>>
>>
>>
>> Jim
>>
>>
>>
>>
>>
>> *From:* Richard Barnes <rlb@ipv.sx>
>> *Sent:* Friday, March 1, 2019 8:13 PM
>> *To:* Jim Schaad <ietf@augustcellars.com <ietf@augustcellars..com>>
>> *Cc:* secdispatch@ietf.org
>> *Subject:* Re: [Secdispatch] DTLS - EDHOC <=3D 32
>>
>>
>>
>> Fair point, Jim, but I don't think it actually matters -- you could just
>> as well add key IDs to TLS, e.g., as a new certificate type (cf. RFC
>> 7250).  So subtract the 32 bytes of PUBKEY from all accounts, and we're
>> still at 32 bytes/message of difference.
>>
>>
>>
>> --Richard
>>
>>
>>
>> On Fri, Mar 1, 2019 at 6:23 PM Jim Schaad <ietf@augustcellars.com
>> <ietf@augustcellars..com>> wrote:
>>
>> Richard,
>>
>>
>>
>> You incorrectly translated the EDHOC protocol below.
>>
>>
>>
>> Jim
>>
>>
>>
>>
>>
>> *From:* Secdispatch <secdispatch-bounces@ietf.org> *On Behalf Of *Richar=
d
>> Barnes
>> *Sent:* Friday, March 1, 2019 9:09 AM
>> *To:* secdispatch@ietf.org
>> *Subject:* [Secdispatch] DTLS - EDHOC <=3D 32
>>
>>
>>
>> Hey folks,
>>
>>
>>
>> To try to understand the size arguments w.r..t. EDHOC / DTLS, I sat down
>> and tried to lower-bound the size of the messages in each protocol.  The
>> theory I'm using here is: The only things that really need to be in thes=
e
>> protocols are the crypto variables.  Everything else is just a matter of
>> encoding or pre-negotiation.  Under that theory, consider the following
>> cartoon sketches of the two protocols in the full handshake, mutually
>> authenticated with asymmetric keys, including minimum sizes in octets
>> assuming a 128-bit security level:
>>
>>
>>
>> DTLS 1.3 (mutually authenticated):
>>
>> 1. C->S: DH (32)
>>
>> 2. S->C: DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32 + 64 + 32 + 16)
>>
>> 3. C->S: PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 32 + 16)
>>
>>
>>
>> EDHOC:
>>
>> 1. C->S: DH (32)
>>
>> 2. S->C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64 + 16)
>>
>>    2.  S->C: DH, SIG, TAG (112 =3D 32 + 64 + 16)
>>
>> 3. C->S: PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)
>>
>>     2. C->S: SIG, Tag (80 =3D 64+16)
>>
>>
>>
>> EDHOC is defined to send a key identifier rather than a key.
>>
>>
>>
>> The conclusions I draw from this (assuming the above summary is correct)=
:
>>
>>
>>
>> 1. The size estimates in the EDHOC draft cannot be correct.  On the one
>> hand, the EDHOC estimates for messages 2 and 3 are all below the above
>> minimums..  On the other hand, the DTLS size estimates indicate a not ve=
ry
>> aggressive optimization, since they are all well above these minimums.
>>
>>
>>
>> 2. The difference between EDHOC and DTLS is at most 32 octets.  Whatever
>> encoding you adopt for EDHOC, it can be translated to DTLS at a cost of =
32
>> octets.  Difference is therefore 64 at most 64 octets based on just that
>> data.
>>
>>
>>
>> 3. The primary driver of the size difference between EDHOC and DTLS is
>> the DTLS Finished MAC.
>>
>>
>>
>> Basically, EDHOC claims they can get away without the Finished MAC
>> because the correct stuff is covered under the AEAD tag.  However, if th=
is
>> approach is correct, then you could also "virtualize" the DTLS Finished =
MAC
>> by having the peers include it in the AEAD calculation, but strip it fro=
m
>> what's sent on the wire.  In either case, fresh analysis is needed.  But=
 an
>> analysis of DTLS with a virtualized MAC seems much simpler and more focu=
sed
>> than starting from scratch.
>>
>>
>>
>> Hope folks find this helpful.
>>
>>
>>
>> --Richard
>>
>> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>

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Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div dir=3D"ltr">Hi folks,<br><br>While I think Richard&#3=
9;s characterization of fTLS is strictly correct,<br>I agree you have to sq=
uint a bit to see that it&#39;s isomorphic to<br>TLS 1.3. In the spirit of =
clarity, I&#39;ve put together the following<br>very rough draft:<br><br>=
=C2=A0=C2=A0 <a href=3D"https://github.com/ekr/draft-rescorla-tls-ctls">htt=
ps://github.com/ekr/draft-rescorla-tls-ctls</a><br><br>This is a pretty str=
aight compactification of TLS 1.3, which<br>gets you down to the following =
message sizes for each flight:<br><br>Flight 1:=C2=A0 59<br>Flight 2: 189<b=
r>Flight 3: 127<br><br>I&#39;ve verified the complicated pieces (CH and SH)=
 with Mint, but I just<br>started on this last night, so I haven&#39;t quit=
e gotten the other pieces<br>coded up, so there may be some small arithmeti=
c errors. Apologies for<br>that in advance.<br><br>The basic approach here =
is to have more compact encodings of<br>everything and then to have some se=
nsible defaults so you don&#39;t have<br>to transmit them. The vast majorit=
y of the data is in the &quot;mandatory&quot;<br>cryptographic material. I&=
#39;ve chosen the following values:<br><br>- 16 byte randoms (matching fTLS=
)<br>- 32 byte Finished messages (matching TLS 1.3)<br>- 8 byte authenticat=
ion tags (matching what EDHOC chose)<br>=C2=A0 If you want 16 bytes, add 8 =
to flights 2 and 3.<br><br>There are some obvious avenues to shave a few by=
tes here and there,<br>mostly because I did a sort of straight translation =
of TLS 1.3, so for<br>instance, there are empty EE and CR messages, and you=
 could omit<br>length fields for some fixed-length or deterministic HS mess=
ages. I<br>didn&#39;t bother with this because it&#39;s more in the way of =
a POC and, as<br>Richard noted, most of the size difference between this an=
d EDHOC is<br>the Randoms and the Finished.<br><br>-Ekr<br><br></div></div>=
<br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon=
, Mar 4, 2019 at 8:01 PM Richard Barnes &lt;rlb@ipv.sx&gt; wrote:<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 dir=3D"ltr"><div>Hi =
G=C3=B6ran,</div><div><br></div><div>The idea of this &quot;fTLS&quot; cons=
truction is that it preserves the underlying AKE that TLS uses.=C2=A0 The o=
nly difference is that:</div><div><br></div><div>1.. The client/server rand=
om values are slightly smaller<br></div><div>2. The messages fed into the t=
ranscript are formatted slightly differently<br></div><div><br></div><div>T=
he idea being that this protocol should preserve all of the security proper=
ties that TLS has, with little or no modification to the prior proofs of th=
ese properties.=C2=A0 I think this is what folks have had in mind when call=
ing for an alternative based on TLS.<br></div><div><br></div><div>--Richard=
<br></div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"l=
tr" class=3D"gmail_attr">On Mon, Mar 4, 2019 at 2:27 PM G=C3=B6ran Selander=
 &lt;<a href=3D"mailto:goran.selander@ericsson.com" target=3D"_blank">goran=
.selander@ericsson.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,2=
04);padding-left:1ex">





<div lang=3D"SV">
<div class=3D"gmail-m_8261912430810445304gmail-m_3213289715386425880WordSec=
tion1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Richard,<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I=E2=80=99m delighted to see th=
at EDHOC has triggered people to start thinking about reducing the overhead=
 of the TLS 1.3 handshake, just like the message size comparison between OS=
CORE and DTLS record layer resulted in the reduced
 overhead for the DTLS record layer. <u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I understand this was an exerci=
se in code size, but I=E2=80=99m confused about what is being implemented. =
This thread started out with an abstracted TLS 1.3, but if I understand rig=
ht, what you are sketching here is a third protocol
 sharing some features of TLS 1.3 and some of EDHOC, but not compatible wit=
h any of them. If that is the case, then I think this has left the category=
 =E2=80=9Ccurrent solutions=E2=80=9D and should be measured with the same y=
ardstick as EDHOC. Since the cryptographic protocol
 is not TLS 1.3, the security properties would need to be re-assessed. The =
message sizes are smaller than TLS 1.3 but larger than EDHOC. As for code s=
ize, the relevant comparison is not standalone, but on top of an existing C=
oAP/OSCORE implementation.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Continuing on this route you ca=
n come arbitrarily close to EDHOC, but can you do something that performs b=
etter?
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">G=C3=B6ran<u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border-color:rgb(181,196,223) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0cm 0cm"=
>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><b><span style=3D"font-si=
ze:12pt;color:black">From:
</span></b><span style=3D"font-size:12pt;color:black">Secdispatch &lt;<a hr=
ef=3D"mailto:secdispatch-bounces@ietf.org" target=3D"_blank">secdispatch-bo=
unces@ietf.org</a>&gt; on behalf of Richard Barnes &lt;rlb@ipv.sx&gt;<br>
<b>Date: </b>Monday, 4 March 2019 at 13:12<br>
<b>To: </b>Jim Schaad &lt;<a href=3D"mailto:ietf@augustcellars.com" target=
=3D"_blank">ietf@augustcellars.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:secdispatch@ietf.org" target=3D"_blank">=
secdispatch@ietf.org</a>&quot; &lt;<a href=3D"mailto:secdispatch@ietf.org" =
target=3D"_blank">secdispatch@ietf.org</a>&gt;<br>
<b>Subject: </b>Re: [Secdispatch] DTLS - EDHOC &lt;=3D 32<u></u><u></u></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Since you asked, I just w=
ent ahead and implemented a &quot;femtoTLS&quot; variant over the weekend.=
=C2=A0 It&#39;s about 420 lines of Go, leveraging some crypto routines and =
message formats from Mint.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><a href=3D"https://github=
..com/bifurcation/mint/compare/ftls" target=3D"_blank">https://github.com/b=
ifurcation/mint/compare/ftls</a><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">The protocol outlined the=
re is TLS 1.3, but with the ClientHello, Server Hello, and Certificate mess=
age replaced with smaller variants.=C2=A0 The message sizes are as follows:=
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">m1 (ClientHello):=C2=A0 5=
6<br>
m2 (ServerHello, Certificate, CertificateVerify, Finished) : 178<br>
m3 (Certificate, CertificateVerify, Finished): 125 <u></u><u></u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Just to highlight the fra=
ming / negotiation overhead:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">m1 =3D Random(16) + DH(32=
) + Overhead(8)<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">m2 =3D Random(16) + DH(32=
) + SIG(64) + MAC(32) + TAG(16) + Overhead(18)<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">m3 =3D SIG(64) + MAC(32) =
+ TAG(16) + Overhead(13)<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">The optimization here is =
pretty light; you could save a few more overhead octets if you were willing=
 to special-case the syntax more.=C2=A0 Encoding in CBOR seems like it woul=
d probably produce results in the same
 ballpark.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">This also nicely highligh=
ts the crypto shortcuts that EDHOC is benefitting from:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">- Omitting Random values =
in the first two messages<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">- Relying on an AEAD tag =
instead of the Finished MAC<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">On Sat, Mar 2, 2019 at 12=
:20 AM Jim Schaad &lt;<a href=3D"mailto:ietf@augustcellars.com" target=3D"_=
blank">ietf@augustcellars.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">I have never done an implementation of TLS, about how =
many lines of code do you think it would be.=C2=A0 If you do all of the cha=
nges that would be necessary to scale things down you basically have a bran=
d new code base in any event..=C2=A0 I have
 done an implementation of EDHOC once upon a time so I have an idea of how =
big of a code base that is.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Assume that crypto does not count as that would be the=
 same for both implementations and is likely to be at least partly in hardw=
are.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Jim<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div style=3D"border-style:none none none solid;border-width:medium medium =
medium 1.5pt;padding:0cm 0cm 0cm 4pt;border-color:currentcolor currentcolor=
 currentcolor blue">
<div>
<div style=3D"border-style:solid none none;border-width:1pt medium medium;p=
adding:3pt 0cm 0cm;border-color:currentcolor">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> Richard Barne=
s &lt;rlb@ipv.sx&gt;
<br>
<b>Sent:</b> Friday, March 1, 2019 8:13 PM<br>
<b>To:</b> Jim Schaad &lt;<a href=3D"mailto:ietf@augustcellars..com" target=
=3D"_blank">ietf@augustcellars.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:secdispatch@ietf.org" target=3D"_blank">secdis=
patch@ietf.org</a><br>
<b>Subject:</b> Re: [Secdispatch] DTLS - EDHOC &lt;=3D 32<u></u><u></u></sp=
an></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Fair point, Jim, but I don&#39;t think it actually mat=
ters -- you could just as well add key IDs to TLS, e.g., as a new certifica=
te type (cf. RFC 7250).=C2=A0 So subtract the 32 bytes of PUBKEY from all a=
ccounts, and we&#39;re still at 32 bytes/message
 of difference.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">--Richard<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">On Fri, Mar 1, 2019 at 6:23 PM Jim Schaad &lt;<a href=
=3D"mailto:ietf@augustcellars..com" target=3D"_blank">ietf@augustcellars.co=
m</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-style:none none none solid;border-width:medium =
medium medium 1pt;padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt 4.8pt;border-c=
olor:currentcolor currentcolor currentcolor rgb(204,204,204)">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Richard,<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">You incorrectly translated the EDHOC protocol below.<u=
></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Jim<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div style=3D"border-style:none none none solid;border-width:medium medium =
medium 1.5pt;padding:0cm 0cm 0cm 4pt;border-color:currentcolor currentcolor=
 currentcolor blue">
<div>
<div style=3D"border-style:solid none none;border-width:1pt medium medium;p=
adding:3pt 0cm 0cm;border-color:currentcolor">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> Secdispatch &=
lt;<a href=3D"mailto:secdispatch-bounces@ietf.org" target=3D"_blank">secdis=
patch-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Richard Barnes<br>
<b>Sent:</b> Friday, March 1, 2019 9:09 AM<br>
<b>To:</b> <a href=3D"mailto:secdispatch@ietf.org" target=3D"_blank">secdis=
patch@ietf.org</a><br>
<b>Subject:</b> [Secdispatch] DTLS - EDHOC &lt;=3D 32<u></u><u></u></span><=
/p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Hey folks,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">To try to understand the size arguments w.r..t. EDHOC =
/ DTLS, I sat down and tried to lower-bound the size of the messages in eac=
h protocol.=C2=A0 The theory I&#39;m using here is: The only things that re=
ally need to be in these protocols are the
 crypto variables.=C2=A0 Everything else is just a matter of encoding or pr=
e-negotiation.=C2=A0 Under that theory, consider the following cartoon sket=
ches of the two protocols in the full handshake, mutually authenticated wit=
h asymmetric keys, including minimum sizes
 in octets assuming a 128-bit security level:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">DTLS 1.3 (mutually authenticated):<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">1. C-&gt;S: DH (32)<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">2. S-&gt;C: DH, PUBKEY, SIG, MAC, TAG (176 =3D 32 + 32=
 + 64 + 32 + 16)<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">3. C-&gt;S: PUBKEY, SIG, MAC, TAG (144 =3D 32 + 64 + 3=
2 + 16)<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">EDHOC:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">1. C-&gt;S: DH (32)<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">2. S-&gt;C: DH, PUBKEY, SIG, TAG (144 =3D 32 + 32 + 64=
 + 16)<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0=C2=A0 <span style=3D"color:red">2.=C2=A0 S-&gt;=
C: DH, SIG, TAG (112 =3D 32 + 64 + 16)</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">3. C-&gt;S: PUBKEY, SIG, TAG (112 =3D 32 + 64 + 16)<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0=C2=A0 <span style=3D"color:red">=C2=A02. C-&gt;=
S: SIG, Tag (80 =3D 64+16)</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"color:red" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US">=
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"color:red" lang=3D"EN-US">EDHOC is defined to send a key ide=
ntifier rather than a key.</span><span lang=3D"EN-US"><u></u><u></u></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">The conclusions I draw from this (assuming the above s=
ummary is correct):<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">1. The size estimates in the EDHOC draft cannot be cor=
rect.=C2=A0 On the one hand, the EDHOC estimates for messages 2 and 3 are a=
ll below the above minimums..=C2=A0 On the other hand, the DTLS size estima=
tes indicate a not very aggressive optimization,
 since they are all well above these minimums.<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">2. The difference between EDHOC and DTLS is at most 32=
 octets.=C2=A0 Whatever encoding you adopt for EDHOC, it can be translated =
to DTLS at a cost of 32 octets.<span style=3D"color:red">=C2=A0 Difference =
is therefore 64 at most 64 octets based on just
 that data.</span><u></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">3. The primary driver of the size difference between E=
DHOC and DTLS is the DTLS Finished MAC.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Basically, EDHOC claims they can get away without the =
Finished MAC because the correct stuff is covered under the AEAD tag.=C2=A0=
 However, if this approach is correct, then you could also &quot;virtualize=
&quot; the DTLS Finished MAC by having the peers
 include it in the AEAD calculation, but strip it from what&#39;s sent on t=
he wire.=C2=A0 In either case, fresh analysis is needed.=C2=A0 But an analy=
sis of DTLS with a virtualized MAC seems much simpler and more focused than=
 starting from scratch.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">Hope folks find this helpful.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span lang=3D"EN-US">--Richard<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>

</blockquote></div>
_______________________________________________<br>
Secdispatch mailing list<br>
<a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@ietf.=
org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispatch</=
a><br>
</blockquote></div>

--0000000000001f3859058359700d--


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Date: Tue, 5 Mar 2019 09:09:32 -0600
From: Benjamin Kaduk <kaduk@mit.edu>
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CC: Richard Barnes <rlb@ipv.sx>, =?iso-8859-1?Q?G=F6ran?= Selander <goran.selander@ericsson.com>, "secdispatch@ietf.org" <secdispatch@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/qvKyBWE-JNJ_Rk-WB2n4pXX-sMo>
Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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On Tue, Mar 05, 2019 at 06:10:02AM -0800, Eric Rescorla wrote:
> Hi folks,
> 
> While I think Richard's characterization of fTLS is strictly correct,
> I agree you have to squint a bit to see that it's isomorphic to
> TLS 1.3. In the spirit of clarity, I've put together the following
> very rough draft:
> 
>    https://github.com/ekr/draft-rescorla-tls-ctls

Thanks for thinking about this more.  I think that Richard's analysis (with
Jim's corrections) did get to the crux of the issue, which is that the
clever encoding games are easy to adjust, and the cryptographic content of
the messages is most important.

>[...]

> There are some obvious avenues to shave a few bytes here and there,
> mostly because I did a sort of straight translation of TLS 1.3, so for
> instance, there are empty EE and CR messages, and you could omit
> length fields for some fixed-length or deterministic HS messages. I
> didn't bother with this because it's more in the way of a POC and, as
> Richard noted, most of the size difference between this and EDHOC is
> the Randoms and the Finished.

In particular, while we may have to defer to the cryptographers about
proving whether using the AEAD tag to perform the role that TLS's distinct
Finished message does, there are some clear engineering tradeoffs in
whether or not to omit the Randoms, and I hope we can set ourselves up for
a productive discussion of that question.  (That is, I wouldn't worry too
much about tidying up cTLS right away.)

I'd also be interested in hearing more about what the EDHOC team's internal
success criteria were (i.e., how they decided it was "done" enough to bring
to the IETF).  Here in SECDISPATCH we'll in effect be coming up with a
new/rehashed problem statement and success criteria for the IETF
application, but having a solid starting point from the preexisting work
could help our efficiency a lot.

-Ben


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--=-=-=
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A reminder, if you find that webex says that your computer is not
"compatible", then visit ietf.webex.com, and "logout".

You can then visit:
    https://ietf.webex.com/ietf/j.php?MTID=m36d7ee1d1c5d7e73010537a4cc710383

and get the webrtc version of webex.  Very stupid.

I wish the IESG would do something about this "free" donation, for which we
have no SLA.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-




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I've been thinking a bit about the use of a key_id as an optimization
to avoid carrying the key, and I think it might be a source of
identity misbinding attacks. Note that this is not an issue specifically
to EDHOC or cTLS or whatever, it can happen whenever you use
this optimization.

Consider the case where Alice has accounts with both Bob and the
Attacker. Alice uses a certificate for authentication both Bob and the
Attacker have registered key_ids with Alice. Specifically, they have
both registered Key_ID=0 and Key=K_Bob. Obviously, the Attacker
doesn't have the private key for Bob, but this can still happen if
Alice doesn't check for PoP.

In this case, there's a trivial identity misbinding attack if the
attacker can get Alice to connect to it, namely:

Alice                     Attacker                       Bob

g^x ->
                          g^x ->
                              <- g^y, ID=0, Sign(K_b, .) ...
 <- g^y, ID=0, Sign(K_b, .) ...

CERT, Sign(K_a, .) ... ->
                                   CERT, Sign(K_a, .) ... ->


This is really just another flavor of the usual misbinding attack
based on someone claiming to have another person's public key
without PoP verification.

The classic defense in SIGMA is that the identities are folded into
the handshake transcript, but the problem is that if the identities
are self-asserted or public keys, you can get identity misbinding as
above (see also
https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/ for
another example of how this can happen).

-Ekr




On Tue, Mar 5, 2019 at 7:09 AM Benjamin Kaduk <kaduk@mit.edu> wrote:

> On Tue, Mar 05, 2019 at 06:10:02AM -0800, Eric Rescorla wrote:
> > Hi folks,
> >
> > While I think Richard's characterization of fTLS is strictly correct,
> > I agree you have to squint a bit to see that it's isomorphic to
> > TLS 1.3. In the spirit of clarity, I've put together the following
> > very rough draft:
> >
> >    https://github.com/ekr/draft-rescorla-tls-ctls
>
> Thanks for thinking about this more.  I think that Richard's analysis (with
> Jim's corrections) did get to the crux of the issue, which is that the
> clever encoding games are easy to adjust, and the cryptographic content of
> the messages is most important.
>
> >[...]
>
> > There are some obvious avenues to shave a few bytes here and there,
> > mostly because I did a sort of straight translation of TLS 1.3, so for
> > instance, there are empty EE and CR messages, and you could omit
> > length fields for some fixed-length or deterministic HS messages. I
> > didn't bother with this because it's more in the way of a POC and, as
> > Richard noted, most of the size difference between this and EDHOC is
> > the Randoms and the Finished.
>
> In particular, while we may have to defer to the cryptographers about
> proving whether using the AEAD tag to perform the role that TLS's distinct
> Finished message does, there are some clear engineering tradeoffs in
> whether or not to omit the Randoms, and I hope we can set ourselves up for
> a productive discussion of that question.  (That is, I wouldn't worry too
> much about tidying up cTLS right away.)
>
> I'd also be interested in hearing more about what the EDHOC team's internal
> success criteria were (i.e., how they decided it was "done" enough to bring
> to the IETF).  Here in SECDISPATCH we'll in effect be coming up with a
> new/rehashed problem statement and success criteria for the IETF
> application, but having a solid starting point from the preexisting work
> could help our efficiency a lot.
>
> -Ben
>

--000000000000fd1bb305835ab40d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr">I&#39;ve been thinking a bit about the us=
e of a key_id as an optimization<br>to avoid carrying the key, and I think =
it might be a source of<br>identity misbinding attacks. Note that this is n=
ot an issue specifically</div><div dir=3D"ltr">to EDHOC or cTLS or whatever=
, it can happen whenever you use</div><div>this optimization.<br></div><div=
 dir=3D"ltr"><br></div><div dir=3D"ltr">Consider the case where Alice has a=
ccounts with both Bob and the<br>Attacker. Alice uses a certificate for aut=
hentication both Bob and the<br>Attacker have registered key_ids with Alice=
. Specifically, they have<br>both registered Key_ID=3D0 and Key=3DK_Bob. Ob=
viously, the Attacker<br>doesn&#39;t have the private key for Bob, but this=
 can still happen if<br>Alice doesn&#39;t check for PoP.<br><br>In this cas=
e, there&#39;s a trivial identity misbinding attack if the<br>attacker can =
get Alice to connect to it, namely:<br><br>Alice=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Attacker=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 Bob<br><br>g^x -&gt;<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 g^x -&gt;<br>=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 &lt;- g^y, ID=3D0, Sign(K_b, .) ...<br>=C2=A0&lt;- g^y, ID=3D0, Sign(K_b, =
.) ...<br><br>CERT, Sign(K_a, .) ... -&gt;<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 CERT, Sign(K_a, .) ... -&gt; <br><br><br>This i=
s really just another flavor of the usual misbinding attack<br>based on som=
eone claiming to have another person&#39;s public key<br>without PoP verifi=
cation.<br><br>The classic defense in SIGMA is that the identities are fold=
ed into<br>the handshake transcript, but the problem is that if the identit=
ies<br>are self-asserted or public keys, you can get identity misbinding as=
<br>above (see also<br><a href=3D"https://datatracker.ietf.org/doc/draft-ie=
tf-mmusic-sdp-uks/">https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-=
uks/</a> for<br>another example of how this can happen).<br><br>-Ekr<br><br=
><br><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Tue, Mar 5, 2019 at 7:09 AM Benjamin Kaduk &lt;<a href=
=3D"mailto:kaduk@mit.edu">kaduk@mit.edu</a>&gt; wrote:<br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex">On Tue, Mar 05, 2019 at 06:10:02AM -=
0800, Eric Rescorla wrote:<br>
&gt; Hi folks,<br>
&gt; <br>
&gt; While I think Richard&#39;s characterization of fTLS is strictly corre=
ct,<br>
&gt; I agree you have to squint a bit to see that it&#39;s isomorphic to<br=
>
&gt; TLS 1.3. In the spirit of clarity, I&#39;ve put together the following=
<br>
&gt; very rough draft:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 <a href=3D"https://github.com/ekr/draft-rescorla-tls-ctls=
" rel=3D"noreferrer" target=3D"_blank">https://github.com/ekr/draft-rescorl=
a-tls-ctls</a><br>
<br>
Thanks for thinking about this more.=C2=A0 I think that Richard&#39;s analy=
sis (with<br>
Jim&#39;s corrections) did get to the crux of the issue, which is that the<=
br>
clever encoding games are easy to adjust, and the cryptographic content of<=
br>
the messages is most important.<br>
<br>
&gt;[...]<br>
<br>
&gt; There are some obvious avenues to shave a few bytes here and there,<br=
>
&gt; mostly because I did a sort of straight translation of TLS 1.3, so for=
<br>
&gt; instance, there are empty EE and CR messages, and you could omit<br>
&gt; length fields for some fixed-length or deterministic HS messages. I<br=
>
&gt; didn&#39;t bother with this because it&#39;s more in the way of a POC =
and, as<br>
&gt; Richard noted, most of the size difference between this and EDHOC is<b=
r>
&gt; the Randoms and the Finished.<br>
<br>
In particular, while we may have to defer to the cryptographers about<br>
proving whether using the AEAD tag to perform the role that TLS&#39;s disti=
nct<br>
Finished message does, there are some clear engineering tradeoffs in<br>
whether or not to omit the Randoms, and I hope we can set ourselves up for<=
br>
a productive discussion of that question.=C2=A0 (That is, I wouldn&#39;t wo=
rry too<br>
much about tidying up cTLS right away.)<br>
<br>
I&#39;d also be interested in hearing more about what the EDHOC team&#39;s =
internal<br>
success criteria were (i.e., how they decided it was &quot;done&quot; enoug=
h to bring<br>
to the IETF).=C2=A0 Here in SECDISPATCH we&#39;ll in effect be coming up wi=
th a<br>
new/rehashed problem statement and success criteria for the IETF<br>
application, but having a solid starting point from the preexisting work<br=
>
could help our efficiency a lot.<br>
<br>
-Ben<br>
</blockquote></div>

--000000000000fd1bb305835ab40d--


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Subject: [Secdispatch] A way to bootstrap post Quantum key distribution.
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Let us say for the sake of argument someone managed to build a working
computer capable of breaking RSA and released it this week. What would we
do?

As things stand, we have no post quantum public key algorithm for
encryption. We have hash signatures of course but the only scheme we need
for encryption is Kerberos. And we would need some means of bootstrap.

[Yes, CAs become KDCs, uggggly. If you have a better plan, put it on the
table.]

One of the schemes I have developed as part of my UDF project is an
encryption key presented as a QR code that is used to form a locator. It
occurred to me that this scheme could be used to bootstrap a kerberos
scheme by using the postal mail as out of band key distribution.

The spec is submitted as an internet draft of course but it is much easier
to read in the HTML format as the superscripts and such are preserved in
the math:

http://mathmesh.com/Documents/draft-hallambaker-mesh-udf.html


This is not what I designed the scheme for of course. The original
application was to enable people to pay bills by putting a QR code on the
paper invoice. The real point of electronic bill payment being to encourage
prompt payment rather than to save the postage  (though the QR code version
could bootstrap that as well).

It seems to me that it is more likely governments will fund research into
disaster preparation schemes lest quantum happen than the bill payment
application. But encouraging use of the Encrypted QR Codes would serve
disaster prep as well as payment.

The scheme is unencumbered as far as I am aware. I discussed the idea with
people as far back as when I was with W3C. It wasn't interesting then as we
didn't all carry barcode scanners with us all the time in those days.

--000000000000eaf76b05835aece8
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-size:small">Let us say for the sake of argument someone managed to build =
a working computer capable of breaking RSA and released it this week. What =
would we do?</div><div class=3D"gmail_default" style=3D"font-size:small"><b=
r></div><div class=3D"gmail_default" style=3D"font-size:small">As things st=
and, we have no post quantum public key algorithm for encryption. We have h=
ash signatures of course but the only scheme we need for encryption is Kerb=
eros. And we would need some means of bootstrap.</div><div class=3D"gmail_d=
efault" style=3D"font-size:small"><br></div><div class=3D"gmail_default" st=
yle=3D"font-size:small">[Yes, CAs become KDCs, uggggly. If you have a bette=
r plan, put it on the table.]</div><div class=3D"gmail_default" style=3D"fo=
nt-size:small"><br></div><div class=3D"gmail_default" style=3D"font-size:sm=
all">One of the schemes I have developed as part of my UDF project is an en=
cryption key presented as a QR code that is used to form a locator. It occu=
rred to me that this scheme could be used to bootstrap a kerberos scheme by=
 using the postal mail as out of band key distribution.</div><div class=3D"=
gmail_default" style=3D"font-size:small"><br></div><div class=3D"gmail_defa=
ult" style=3D"font-size:small">The spec is submitted as an internet draft o=
f course but it is much easier to read in the HTML format as the superscrip=
ts and such are preserved in the math:</div><div class=3D"gmail_default" st=
yle=3D"font-size:small"><br></div><div class=3D"gmail_default"><a href=3D"h=
ttp://mathmesh.com/Documents/draft-hallambaker-mesh-udf.html">http://mathme=
sh.com/Documents/draft-hallambaker-mesh-udf.html</a><br></div><div class=3D=
"gmail_default"><br></div><div class=3D"gmail_default"><br></div><div class=
=3D"gmail_default">This is not what I designed the scheme for of course. Th=
e original application was to enable people to pay bills by putting a QR co=
de on the paper invoice. The real point of electronic bill payment being to=
 encourage prompt payment rather than to save the postage=C2=A0 (though the=
 QR code version could bootstrap that as well).</div><div class=3D"gmail_de=
fault"><br></div><div class=3D"gmail_default">It seems to me that it is mor=
e likely governments will fund research into disaster preparation schemes l=
est quantum happen than the bill payment application. But encouraging use o=
f the Encrypted QR Codes would serve disaster prep as well as payment.</div=
><div class=3D"gmail_default"><br></div><div class=3D"gmail_default">The sc=
heme is unencumbered as far as I am aware. I discussed the idea with people=
 as far back as when I was with W3C. It wasn&#39;t interesting then as we d=
idn&#39;t all carry barcode scanners with us all the time in those days.</d=
iv></div></div>

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Date: Tue, 05 Mar 2019 12:49:55 -0500
From: "Martin Thomson" <mt@lowentropy.net>
To: secdispatch@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/tRDws7VqignhEr8Cv_78YP3VFgQ>
Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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Just to close the loop on this particular question, the response from John here was that if the transcript includes the inferred identity not the key_id, then you avoid misbinding because a disagreement about identity leads to a different transcript.

This is very different than the cached-info design, where the hash stands in for the identity.

On Wed, Mar 6, 2019, at 02:41, Eric Rescorla wrote:
> I've been thinking a bit about the use of a key_id as an optimization
> to avoid carrying the key, and I think it might be a source of
> identity misbinding attacks. Note that this is not an issue specifically
> to EDHOC or cTLS or whatever, it can happen whenever you use
> this optimization.
> 
> Consider the case where Alice has accounts with both Bob and the
> Attacker. Alice uses a certificate for authentication both Bob and the
> Attacker have registered key_ids with Alice.. Specifically, they have
> both registered Key_ID=0 and Key=K_Bob. Obviously, the Attacker
> doesn't have the private key for Bob, but this can still happen if
> Alice doesn't check for PoP.
> 
> In this case, there's a trivial identity misbinding attack if the
> attacker can get Alice to connect to it, namely:
> 
> Alice Attacker Bob
> 
> g^x ->
>  g^x ->
>  <- g^y, ID=0, Sign(K_b, .) ...
>  <- g^y, ID=0, Sign(K_b, ..) ...
> 
> CERT, Sign(K_a, .) ... ->
>  CERT, Sign(K_a, .) ... -> 
> 
> 
> This is really just another flavor of the usual misbinding attack
> based on someone claiming to have another person's public key
> without PoP verification.
> 
> The classic defense in SIGMA is that the identities are folded into
> the handshake transcript, but the problem is that if the identities
> are self-asserted or public keys, you can get identity misbinding as
> above (see also
> https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/ for
> another example of how this can happen).
> 
> -Ekr
> 
> 
> 
> 
> On Tue, Mar 5, 2019 at 7:09 AM Benjamin Kaduk <kaduk@mit.edu> wrote:
> > On Tue, Mar 05, 2019 at 06:10:02AM -0800, Eric Rescorla wrote:
> >  > Hi folks,
> >  > 
> >  > While I think Richard's characterization of fTLS is strictly correct,
> >  > I agree you have to squint a bit to see that it's isomorphic to
> >  > TLS 1.3. In the spirit of clarity, I've put together the following
> >  > very rough draft:
> >  > 
> >  > https://github.com/ekr/draft-rescorla-tls-ctls
> > 
> >  Thanks for thinking about this more. I think that Richard's analysis (with
> >  Jim's corrections) did get to the crux of the issue, which is that the
> >  clever encoding games are easy to adjust, and the cryptographic content of
> >  the messages is most important.
> > 
> >  >[...]
> > 
> >  > There are some obvious avenues to shave a few bytes here and there,
> >  > mostly because I did a sort of straight translation of TLS 1.3, so for
> >  > instance, there are empty EE and CR messages, and you could omit
> >  > length fields for some fixed-length or deterministic HS messages. I
> >  > didn't bother with this because it's more in the way of a POC and, as
> >  > Richard noted, most of the size difference between this and EDHOC is
> >  > the Randoms and the Finished.
> > 
> >  In particular, while we may have to defer to the cryptographers about
> >  proving whether using the AEAD tag to perform the role that TLS's distinct
> >  Finished message does, there are some clear engineering tradeoffs in
> >  whether or not to omit the Randoms, and I hope we can set ourselves up for
> >  a productive discussion of that question. (That is, I wouldn't worry too
> >  much about tidying up cTLS right away.)
> > 
> >  I'd also be interested in hearing more about what the EDHOC team's internal
> >  success criteria were (i.e., how they decided it was "done" enough to bring
> >  to the IETF). Here in SECDISPATCH we'll in effect be coming up with a
> >  new/rehashed problem statement and success criteria for the IETF
> >  application, but having a solid starting point from the preexisting work
> >  could help our efficiency a lot.
> > 
> >  -Ben
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>


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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 5 Mar 2019 09:56:15 -0800
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To: Martin Thomson <mt@lowentropy.net>
Cc: IETF SecDispatch <secdispatch@ietf.org>
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Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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On Tue, Mar 5, 2019 at 9:50 AM Martin Thomson <mt@lowentropy.net> wrote:

> Just to close the loop on this particular question, the response from John
> here was that if the transcript includes the inferred identity not the
> key_id, then you avoid misbinding because a disagreement about identity
> leads to a different transcript.
>

Hmm... Maybe? If the identities are just RPKs with no other identifier,
then I think this still can happen.



> This is very different than the cached-info design, where the hash stands
> in for the identity.
>

Well, the cached info design is tied to the cert (if there is a cert) so it
transitively includes the identity.

-Ekr


> On Wed, Mar 6, 2019, at 02:41, Eric Rescorla wrote:
> > I've been thinking a bit about the use of a key_id as an optimization
> > to avoid carrying the key, and I think it might be a source of
> > identity misbinding attacks. Note that this is not an issue specifically
> > to EDHOC or cTLS or whatever, it can happen whenever you use
> > this optimization.
> >
> > Consider the case where Alice has accounts with both Bob and the
> > Attacker. Alice uses a certificate for authentication both Bob and the
> > Attacker have registered key_ids with Alice.. Specifically, they have
> > both registered Key_ID=0 and Key=K_Bob. Obviously, the Attacker
> > doesn't have the private key for Bob, but this can still happen if
> > Alice doesn't check for PoP.
> >
> > In this case, there's a trivial identity misbinding attack if the
> > attacker can get Alice to connect to it, namely:
> >
> > Alice Attacker Bob
> >
> > g^x ->
> >  g^x ->
> >  <- g^y, ID=0, Sign(K_b, .) ...
> >  <- g^y, ID=0, Sign(K_b, ..) ...
> >
> > CERT, Sign(K_a, .) ... ->
> >  CERT, Sign(K_a, .) ... ->
> >
> >
> > This is really just another flavor of the usual misbinding attack
> > based on someone claiming to have another person's public key
> > without PoP verification.
> >
> > The classic defense in SIGMA is that the identities are folded into
> > the handshake transcript, but the problem is that if the identities
> > are self-asserted or public keys, you can get identity misbinding as
> > above (see also
> > https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/ for
> > another example of how this can happen).
> >
> > -Ekr
> >
> >
> >
> >
> > On Tue, Mar 5, 2019 at 7:09 AM Benjamin Kaduk <kaduk@mit.edu> wrote:
> > > On Tue, Mar 05, 2019 at 06:10:02AM -0800, Eric Rescorla wrote:
> > >  > Hi folks,
> > >  >
> > >  > While I think Richard's characterization of fTLS is strictly
> correct,
> > >  > I agree you have to squint a bit to see that it's isomorphic to
> > >  > TLS 1.3. In the spirit of clarity, I've put together the following
> > >  > very rough draft:
> > >  >
> > >  > https://github.com/ekr/draft-rescorla-tls-ctls
> > >
> > >  Thanks for thinking about this more. I think that Richard's analysis
> (with
> > >  Jim's corrections) did get to the crux of the issue, which is that the
> > >  clever encoding games are easy to adjust, and the cryptographic
> content of
> > >  the messages is most important.
> > >
> > >  >[...]
> > >
> > >  > There are some obvious avenues to shave a few bytes here and there,
> > >  > mostly because I did a sort of straight translation of TLS 1.3, so
> for
> > >  > instance, there are empty EE and CR messages, and you could omit
> > >  > length fields for some fixed-length or deterministic HS messages. I
> > >  > didn't bother with this because it's more in the way of a POC and,
> as
> > >  > Richard noted, most of the size difference between this and EDHOC is
> > >  > the Randoms and the Finished.
> > >
> > >  In particular, while we may have to defer to the cryptographers about
> > >  proving whether using the AEAD tag to perform the role that TLS's
> distinct
> > >  Finished message does, there are some clear engineering tradeoffs in
> > >  whether or not to omit the Randoms, and I hope we can set ourselves
> up for
> > >  a productive discussion of that question. (That is, I wouldn't worry
> too
> > >  much about tidying up cTLS right away.)
> > >
> > >  I'd also be interested in hearing more about what the EDHOC team's
> internal
> > >  success criteria were (i.e., how they decided it was "done" enough to
> bring
> > >  to the IETF). Here in SECDISPATCH we'll in effect be coming up with a
> > >  new/rehashed problem statement and success criteria for the IETF
> > >  application, but having a solid starting point from the preexisting
> work
> > >  could help our efficiency a lot.
> > >
> > >  -Ben
> > _______________________________________________
> > Secdispatch mailing list
> > Secdispatch@ietf.org
> > https://www.ietf.org/mailman/listinfo/secdispatch
> >
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>

--00000000000013574c05835c99f4
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"g=
mail_attr">On Tue, Mar 5, 2019 at 9:50 AM Martin Thomson &lt;<a href=3D"mai=
lto:mt@lowentropy.net">mt@lowentropy.net</a>&gt; wrote:<br></div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px s=
olid rgb(204,204,204);padding-left:1ex">Just to close the loop on this part=
icular question, the response from John here was that if the transcript inc=
ludes the inferred identity not the key_id, then you avoid misbinding becau=
se a disagreement about identity leads to a different transcript.<br></bloc=
kquote><div><br></div><div>Hmm... Maybe? If the identities are just RPKs wi=
th no other identifier, then I think this still can happen.</div><div><br><=
/div><div>=C2=A0</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">
This is very different than the cached-info design, where the hash stands i=
n for the identity.<br></blockquote><div><br></div><div>Well, the cached in=
fo design is tied to the cert (if there is a cert) so it transitively inclu=
des the identity.<br></div><div><br></div><div>-Ekr</div><div><br></div><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-lef=
t:1px solid rgb(204,204,204);padding-left:1ex">
<br>
On Wed, Mar 6, 2019, at 02:41, Eric Rescorla wrote:<br>
&gt; I&#39;ve been thinking a bit about the use of a key_id as an optimizat=
ion<br>
&gt; to avoid carrying the key, and I think it might be a source of<br>
&gt; identity misbinding attacks. Note that this is not an issue specifical=
ly<br>
&gt; to EDHOC or cTLS or whatever, it can happen whenever you use<br>
&gt; this optimization.<br>
&gt; <br>
&gt; Consider the case where Alice has accounts with both Bob and the<br>
&gt; Attacker. Alice uses a certificate for authentication both Bob and the=
<br>
&gt; Attacker have registered key_ids with Alice.. Specifically, they have<=
br>
&gt; both registered Key_ID=3D0 and Key=3DK_Bob. Obviously, the Attacker<br=
>
&gt; doesn&#39;t have the private key for Bob, but this can still happen if=
<br>
&gt; Alice doesn&#39;t check for PoP.<br>
&gt; <br>
&gt; In this case, there&#39;s a trivial identity misbinding attack if the<=
br>
&gt; attacker can get Alice to connect to it, namely:<br>
&gt; <br>
&gt; Alice Attacker Bob<br>
&gt; <br>
&gt; g^x -&gt;<br>
&gt;=C2=A0 g^x -&gt;<br>
&gt;=C2=A0 &lt;- g^y, ID=3D0, Sign(K_b, .) ...<br>
&gt;=C2=A0 &lt;- g^y, ID=3D0, Sign(K_b, ..) ...<br>
&gt; <br>
&gt; CERT, Sign(K_a, .) ... -&gt;<br>
&gt;=C2=A0 CERT, Sign(K_a, .) ... -&gt; <br>
&gt; <br>
&gt; <br>
&gt; This is really just another flavor of the usual misbinding attack<br>
&gt; based on someone claiming to have another person&#39;s public key<br>
&gt; without PoP verification.<br>
&gt; <br>
&gt; The classic defense in SIGMA is that the identities are folded into<br=
>
&gt; the handshake transcript, but the problem is that if the identities<br=
>
&gt; are self-asserted or public keys, you can get identity misbinding as<b=
r>
&gt; above (see also<br>
&gt; <a href=3D"https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/=
" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/dra=
ft-ietf-mmusic-sdp-uks/</a> for<br>
&gt; another example of how this can happen).<br>
&gt; <br>
&gt; -Ekr<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; On Tue, Mar 5, 2019 at 7:09 AM Benjamin Kaduk &lt;<a href=3D"mailto:ka=
duk@mit.edu" target=3D"_blank">kaduk@mit.edu</a>&gt; wrote:<br>
&gt; &gt; On Tue, Mar 05, 2019 at 06:10:02AM -0800, Eric Rescorla wrote:<br=
>
&gt; &gt;=C2=A0 &gt; Hi folks,<br>
&gt; &gt;=C2=A0 &gt; <br>
&gt; &gt;=C2=A0 &gt; While I think Richard&#39;s characterization of fTLS i=
s strictly correct,<br>
&gt; &gt;=C2=A0 &gt; I agree you have to squint a bit to see that it&#39;s =
isomorphic to<br>
&gt; &gt;=C2=A0 &gt; TLS 1.3. In the spirit of clarity, I&#39;ve put togeth=
er the following<br>
&gt; &gt;=C2=A0 &gt; very rough draft:<br>
&gt; &gt;=C2=A0 &gt; <br>
&gt; &gt;=C2=A0 &gt; <a href=3D"https://github.com/ekr/draft-rescorla-tls-c=
tls" rel=3D"noreferrer" target=3D"_blank">https://github.com/ekr/draft-resc=
orla-tls-ctls</a><br>
&gt; &gt; <br>
&gt; &gt;=C2=A0 Thanks for thinking about this more. I think that Richard&#=
39;s analysis (with<br>
&gt; &gt;=C2=A0 Jim&#39;s corrections) did get to the crux of the issue, wh=
ich is that the<br>
&gt; &gt;=C2=A0 clever encoding games are easy to adjust, and the cryptogra=
phic content of<br>
&gt; &gt;=C2=A0 the messages is most important.<br>
&gt; &gt; <br>
&gt; &gt;=C2=A0 &gt;[...]<br>
&gt; &gt; <br>
&gt; &gt;=C2=A0 &gt; There are some obvious avenues to shave a few bytes he=
re and there,<br>
&gt; &gt;=C2=A0 &gt; mostly because I did a sort of straight translation of=
 TLS 1.3, so for<br>
&gt; &gt;=C2=A0 &gt; instance, there are empty EE and CR messages, and you =
could omit<br>
&gt; &gt;=C2=A0 &gt; length fields for some fixed-length or deterministic H=
S messages. I<br>
&gt; &gt;=C2=A0 &gt; didn&#39;t bother with this because it&#39;s more in t=
he way of a POC and, as<br>
&gt; &gt;=C2=A0 &gt; Richard noted, most of the size difference between thi=
s and EDHOC is<br>
&gt; &gt;=C2=A0 &gt; the Randoms and the Finished.<br>
&gt; &gt; <br>
&gt; &gt;=C2=A0 In particular, while we may have to defer to the cryptograp=
hers about<br>
&gt; &gt;=C2=A0 proving whether using the AEAD tag to perform the role that=
 TLS&#39;s distinct<br>
&gt; &gt;=C2=A0 Finished message does, there are some clear engineering tra=
deoffs in<br>
&gt; &gt;=C2=A0 whether or not to omit the Randoms, and I hope we can set o=
urselves up for<br>
&gt; &gt;=C2=A0 a productive discussion of that question. (That is, I would=
n&#39;t worry too<br>
&gt; &gt;=C2=A0 much about tidying up cTLS right away.)<br>
&gt; &gt; <br>
&gt; &gt;=C2=A0 I&#39;d also be interested in hearing more about what the E=
DHOC team&#39;s internal<br>
&gt; &gt;=C2=A0 success criteria were (i.e., how they decided it was &quot;=
done&quot; enough to bring<br>
&gt; &gt;=C2=A0 to the IETF). Here in SECDISPATCH we&#39;ll in effect be co=
ming up with a<br>
&gt; &gt;=C2=A0 new/rehashed problem statement and success criteria for the=
 IETF<br>
&gt; &gt;=C2=A0 application, but having a solid starting point from the pre=
existing work<br>
&gt; &gt;=C2=A0 could help our efficiency a lot.<br>
&gt; &gt; <br>
&gt; &gt;=C2=A0 -Ben<br>
&gt; _______________________________________________<br>
&gt; Secdispatch mailing list<br>
&gt; <a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@=
ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"n=
oreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispa=
tch</a><br>
&gt;<br>
<br>
_______________________________________________<br>
Secdispatch mailing list<br>
<a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@ietf.=
org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispatch</=
a><br>
</blockquote></div></div>

--00000000000013574c05835c99f4--


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Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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I don=E2=80=99t understand the attack below.  Are you missing some =
pieces or did things get misaligned?  What do you think the attacker is =
ending up with at the end?  g^xy?

=20

Jim

=20

=20

From: Secdispatch <secdispatch-bounces@ietf.org> On Behalf Of Eric =
Rescorla
Sent: Tuesday, March 5, 2019 7:41 AM
To: Benjamin Kaduk <kaduk@mit.edu>
Cc: Richard Barnes <rlb@ipv.sx>; G=C3=B6ran Selander =
<goran.selander@ericsson.com>; secdispatch@ietf.org
Subject: Re: [Secdispatch] DTLS - EDHOC <=3D 32

=20

I've been thinking a bit about the use of a key_id as an optimization
to avoid carrying the key, and I think it might be a source of
identity misbinding attacks. Note that this is not an issue specifically

to EDHOC or cTLS or whatever, it can happen whenever you use

this optimization.

=20

Consider the case where Alice has accounts with both Bob and the
Attacker. Alice uses a certificate for authentication both Bob and the
Attacker have registered key_ids with Alice.. Specifically, they have
both registered Key_ID=3D0 and Key=3DK_Bob. Obviously, the Attacker
doesn't have the private key for Bob, but this can still happen if
Alice doesn't check for PoP.

In this case, there's a trivial identity misbinding attack if the
attacker can get Alice to connect to it, namely:

Alice                     Attacker                       Bob

g^x ->
                          g^x ->
                              <- g^y, ID=3D0, Sign(K_b, .) ...
 <- g^y, ID=3D0, Sign(K_b, ..) ...

CERT, Sign(K_a, .) ... ->
                                   CERT, Sign(K_a, .) ... ->=20


This is really just another flavor of the usual misbinding attack
based on someone claiming to have another person's public key
without PoP verification.

The classic defense in SIGMA is that the identities are folded into
the handshake transcript, but the problem is that if the identities
are self-asserted or public keys, you can get identity misbinding as
above (see also
https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/ for
another example of how this can happen).

-Ekr




=20

On Tue, Mar 5, 2019 at 7:09 AM Benjamin Kaduk <kaduk@mit.edu =
<mailto:kaduk@mit.edu> > wrote:

On Tue, Mar 05, 2019 at 06:10:02AM -0800, Eric Rescorla wrote:
> Hi folks,
>=20
> While I think Richard's characterization of fTLS is strictly correct,
> I agree you have to squint a bit to see that it's isomorphic to
> TLS 1.3. In the spirit of clarity, I've put together the following
> very rough draft:
>=20
>    https://github.com/ekr/draft-rescorla-tls-ctls

Thanks for thinking about this more.  I think that Richard's analysis =
(with
Jim's corrections) did get to the crux of the issue, which is that the
clever encoding games are easy to adjust, and the cryptographic content =
of
the messages is most important.

>[...]

> There are some obvious avenues to shave a few bytes here and there,
> mostly because I did a sort of straight translation of TLS 1.3, so for
> instance, there are empty EE and CR messages, and you could omit
> length fields for some fixed-length or deterministic HS messages. I
> didn't bother with this because it's more in the way of a POC and, as
> Richard noted, most of the size difference between this and EDHOC is
> the Randoms and the Finished.

In particular, while we may have to defer to the cryptographers about
proving whether using the AEAD tag to perform the role that TLS's =
distinct
Finished message does, there are some clear engineering tradeoffs in
whether or not to omit the Randoms, and I hope we can set ourselves up =
for
a productive discussion of that question.  (That is, I wouldn't worry =
too
much about tidying up cTLS right away.)

I'd also be interested in hearing more about what the EDHOC team's =
internal
success criteria were (i.e., how they decided it was "done" enough to =
bring
to the IETF).  Here in SECDISPATCH we'll in effect be coming up with a
new/rehashed problem statement and success criteria for the IETF
application, but having a solid starting point from the preexisting work
could help our efficiency a lot.

-Ben


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>I =
don=E2=80=99t understand the attack below.=C2=A0 Are you missing some =
pieces or did things get misaligned?=C2=A0 What do you think the =
attacker is ending up with at the end?=C2=A0 g^xy?<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Jim<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b>From:</b> =
Secdispatch &lt;secdispatch-bounces@ietf.org&gt; <b>On Behalf Of =
</b>Eric Rescorla<br><b>Sent:</b> Tuesday, March 5, 2019 7:41 =
AM<br><b>To:</b> Benjamin Kaduk &lt;kaduk@mit.edu&gt;<br><b>Cc:</b> =
Richard Barnes &lt;rlb@ipv.sx&gt;; G=C3=B6ran Selander =
&lt;goran.selander@ericsson.com&gt;; =
secdispatch@ietf.org<br><b>Subject:</b> Re: [Secdispatch] DTLS - EDHOC =
&lt;=3D 32<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>I've been thinking a bit about the use of a key_id as =
an optimization<br>to avoid carrying the key, and I think it might be a =
source of<br>identity misbinding attacks. Note that this is not an issue =
specifically<o:p></o:p></p></div><div><p class=3DMsoNormal>to EDHOC or =
cTLS or whatever, it can happen whenever you =
use<o:p></o:p></p></div><div><p class=3DMsoNormal>this =
optimization.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>Consider the case where Alice has =
accounts with both Bob and the<br>Attacker. Alice uses a certificate for =
authentication both Bob and the<br>Attacker have registered key_ids with =
Alice.. Specifically, they have<br>both registered Key_ID=3D0 and =
Key=3DK_Bob. Obviously, the Attacker<br>doesn't have the private key for =
Bob, but this can still happen if<br>Alice doesn't check for =
PoP.<br><br>In this case, there's a trivial identity misbinding attack =
if the<br>attacker can get Alice to connect to it, =
namely:<br><br>Alice&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Attacker&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Bob<br><br>g^x =
-&gt;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; g^x =
-&gt;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;- g^y, ID=3D0, Sign(K_b, .) =
...<br>&nbsp;&lt;- g^y, ID=3D0, Sign(K_b, ..) ...<br><br>CERT, Sign(K_a, =
.) ... =
-&gt;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
CERT, Sign(K_a, .) ... -&gt; <br><br><br>This is really just another =
flavor of the usual misbinding attack<br>based on someone claiming to =
have another person's public key<br>without PoP verification.<br><br>The =
classic defense in SIGMA is that the identities are folded into<br>the =
handshake transcript, but the problem is that if the identities<br>are =
self-asserted or public keys, you can get identity misbinding =
as<br>above (see also<br><a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/">http=
s://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/</a> =
for<br>another example of how this can =
happen).<br><br>-Ekr<br><br><br><o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Tue, Mar 5, 2019 at 7:09 AM Benjamin Kaduk &lt;<a =
href=3D"mailto:kaduk@mit.edu">kaduk@mit.edu</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><p class=3DMsoNormal>On Tue, =
Mar 05, 2019 at 06:10:02AM -0800, Eric Rescorla wrote:<br>&gt; Hi =
folks,<br>&gt; <br>&gt; While I think Richard's characterization of fTLS =
is strictly correct,<br>&gt; I agree you have to squint a bit to see =
that it's isomorphic to<br>&gt; TLS 1.3. In the spirit of clarity, I've =
put together the following<br>&gt; very rough draft:<br>&gt; =
<br>&gt;&nbsp; &nbsp; <a =
href=3D"https://github.com/ekr/draft-rescorla-tls-ctls" =
target=3D"_blank">https://github.com/ekr/draft-rescorla-tls-ctls</a><br><=
br>Thanks for thinking about this more.&nbsp; I think that Richard's =
analysis (with<br>Jim's corrections) did get to the crux of the issue, =
which is that the<br>clever encoding games are easy to adjust, and the =
cryptographic content of<br>the messages is most =
important.<br><br>&gt;[...]<br><br>&gt; There are some obvious avenues =
to shave a few bytes here and there,<br>&gt; mostly because I did a sort =
of straight translation of TLS 1.3, so for<br>&gt; instance, there are =
empty EE and CR messages, and you could omit<br>&gt; length fields for =
some fixed-length or deterministic HS messages. I<br>&gt; didn't bother =
with this because it's more in the way of a POC and, as<br>&gt; Richard =
noted, most of the size difference between this and EDHOC is<br>&gt; the =
Randoms and the Finished.<br><br>In particular, while we may have to =
defer to the cryptographers about<br>proving whether using the AEAD tag =
to perform the role that TLS's distinct<br>Finished message does, there =
are some clear engineering tradeoffs in<br>whether or not to omit the =
Randoms, and I hope we can set ourselves up for<br>a productive =
discussion of that question.&nbsp; (That is, I wouldn't worry =
too<br>much about tidying up cTLS right away.)<br><br>I'd also be =
interested in hearing more about what the EDHOC team's =
internal<br>success criteria were (i.e., how they decided it was =
&quot;done&quot; enough to bring<br>to the IETF).&nbsp; Here in =
SECDISPATCH we'll in effect be coming up with a<br>new/rehashed problem =
statement and success criteria for the IETF<br>application, but having a =
solid starting point from the preexisting work<br>could help our =
efficiency a =
lot.<br><br>-Ben<o:p></o:p></p></blockquote></div></div></div></body></ht=
ml>
------=_NextPart_000_015A_01D4D33A.2F493DC0--


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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 5 Mar 2019 10:12:19 -0800
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To: Jim Schaad <ietf@augustcellars.com>
Cc: Benjamin Kaduk <kaduk@mit.edu>, Richard Barnes <rlb@ipv.sx>,  =?UTF-8?Q?G=C3=B6ran_Selander?= <goran.selander@ericsson.com>,  IETF SecDispatch <secdispatch@ietf.org>
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Subject: Re: [Secdispatch] DTLS - EDHOC <= 32
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No. Alice thinks she is talking to the attacker but she's actually talking
to Bob.

The attacker doesn't get to see the traffic, but that's not necessarily
required for an attack. Say that the attacker is able to control the
messages that Alice sends to itself (this is very natural in the Web
context), then it can divert those messages to Bob but authenticated by
Alice.

-Ekr


On Tue, Mar 5, 2019 at 10:00 AM Jim Schaad <ietf@augustcellars.com> wrote:

> I don=E2=80=99t understand the attack below.  Are you missing some pieces=
 or did
> things get misaligned?  What do you think the attacker is ending up with =
at
> the end?  g^xy?
>
>
>
> Jim
>
>
>
>
>
> *From:* Secdispatch <secdispatch-bounces@ietf.org> *On Behalf Of *Eric
> Rescorla
> *Sent:* Tuesday, March 5, 2019 7:41 AM
> *To:* Benjamin Kaduk <kaduk@mit.edu>
> *Cc:* Richard Barnes <rlb@ipv.sx>; G=C3=B6ran Selander <
> goran.selander@ericsson.com>; secdispatch@ietf.org
> *Subject:* Re: [Secdispatch] DTLS - EDHOC <=3D 32
>
>
>
> I've been thinking a bit about the use of a key_id as an optimization
> to avoid carrying the key, and I think it might be a source of
> identity misbinding attacks. Note that this is not an issue specifically
>
> to EDHOC or cTLS or whatever, it can happen whenever you use
>
> this optimization.
>
>
>
> Consider the case where Alice has accounts with both Bob and the
> Attacker. Alice uses a certificate for authentication both Bob and the
> Attacker have registered key_ids with Alice.. Specifically, they have
> both registered Key_ID=3D0 and Key=3DK_Bob. Obviously, the Attacker
> doesn't have the private key for Bob, but this can still happen if
> Alice doesn't check for PoP.
>
> In this case, there's a trivial identity misbinding attack if the
> attacker can get Alice to connect to it, namely:
>
> Alice                     Attacker                       Bob
>
> g^x ->
>                           g^x ->
>                               <- g^y, ID=3D0, Sign(K_b, .) ...
>  <- g^y, ID=3D0, Sign(K_b, ..) ...
>
> CERT, Sign(K_a, .) ... ->
>                                    CERT, Sign(K_a, .) ... ->
>
>
> This is really just another flavor of the usual misbinding attack
> based on someone claiming to have another person's public key
> without PoP verification.
>
> The classic defense in SIGMA is that the identities are folded into
> the handshake transcript, but the problem is that if the identities
> are self-asserted or public keys, you can get identity misbinding as
> above (see also
> https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/ for
> another example of how this can happen).
>
> -Ekr
>
>
>
>
> On Tue, Mar 5, 2019 at 7:09 AM Benjamin Kaduk <kaduk@mit.edu> wrote:
>
> On Tue, Mar 05, 2019 at 06:10:02AM -0800, Eric Rescorla wrote:
> > Hi folks,
> >
> > While I think Richard's characterization of fTLS is strictly correct,
> > I agree you have to squint a bit to see that it's isomorphic to
> > TLS 1.3. In the spirit of clarity, I've put together the following
> > very rough draft:
> >
> >    https://github.com/ekr/draft-rescorla-tls-ctls
>
> Thanks for thinking about this more.  I think that Richard's analysis (wi=
th
> Jim's corrections) did get to the crux of the issue, which is that the
> clever encoding games are easy to adjust, and the cryptographic content o=
f
> the messages is most important.
>
> >[...]
>
> > There are some obvious avenues to shave a few bytes here and there,
> > mostly because I did a sort of straight translation of TLS 1.3, so for
> > instance, there are empty EE and CR messages, and you could omit
> > length fields for some fixed-length or deterministic HS messages. I
> > didn't bother with this because it's more in the way of a POC and, as
> > Richard noted, most of the size difference between this and EDHOC is
> > the Randoms and the Finished.
>
> In particular, while we may have to defer to the cryptographers about
> proving whether using the AEAD tag to perform the role that TLS's distinc=
t
> Finished message does, there are some clear engineering tradeoffs in
> whether or not to omit the Randoms, and I hope we can set ourselves up fo=
r
> a productive discussion of that question.  (That is, I wouldn't worry too
> much about tidying up cTLS right away.)
>
> I'd also be interested in hearing more about what the EDHOC team's intern=
al
> success criteria were (i.e., how they decided it was "done" enough to bri=
ng
> to the IETF).  Here in SECDISPATCH we'll in effect be coming up with a
> new/rehashed problem statement and success criteria for the IETF
> application, but having a solid starting point from the preexisting work
> could help our efficiency a lot.
>
> -Ben
>
>

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>No. Alice thinks she is talking to the attacker but s=
he&#39;s actually talking to Bob.</div><div><br></div><div>The attacker doe=
sn&#39;t get to see the traffic, but that&#39;s not necessarily required fo=
r an attack. Say that the attacker is able to control the messages that Ali=
ce sends to itself (this is very natural in the Web context), then it can d=
ivert those messages to Bob but authenticated by Alice.<br></div><div><br><=
/div><div>-Ekr</div><div><br></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Tue, Mar 5, 2019 at 10:00 AM Jim Schaad &l=
t;<a href=3D"mailto:ietf@augustcellars.com">ietf@augustcellars.com</a>&gt; =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=
=3D"EN-US"><div class=3D"gmail-m_9219671957895552125WordSection1"><p class=
=3D"MsoNormal">I don=E2=80=99t understand the attack below.=C2=A0 Are you m=
issing some pieces or did things get misaligned?=C2=A0 What do you think th=
e attacker is ending up with at the end?=C2=A0 g^xy?<u></u><u></u></p><p cl=
ass=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Jim<u></u>=
<u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNo=
rmal"><u></u>=C2=A0<u></u></p><div style=3D"border-color:currentcolor curre=
ntcolor currentcolor blue;border-style:none none none solid;border-width:me=
dium medium medium 1.5pt;padding:0in 0in 0in 4pt"><div><div style=3D"border=
-color:rgb(225,225,225) currentcolor currentcolor;border-style:solid none n=
one;border-width:1pt medium medium;padding:3pt 0in 0in"><p class=3D"MsoNorm=
al"><b>From:</b> Secdispatch &lt;<a href=3D"mailto:secdispatch-bounces@ietf=
.org" target=3D"_blank">secdispatch-bounces@ietf.org</a>&gt; <b>On Behalf O=
f </b>Eric Rescorla<br><b>Sent:</b> Tuesday, March 5, 2019 7:41 AM<br><b>To=
:</b> Benjamin Kaduk &lt;<a href=3D"mailto:kaduk@mit.edu" target=3D"_blank"=
>kaduk@mit.edu</a>&gt;<br><b>Cc:</b> Richard Barnes &lt;rlb@ipv.sx&gt;; G=
=C3=B6ran Selander &lt;<a href=3D"mailto:goran.selander@ericsson.com" targe=
t=3D"_blank">goran.selander@ericsson.com</a>&gt;; <a href=3D"mailto:secdisp=
atch@ietf.org" target=3D"_blank">secdispatch@ietf.org</a><br><b>Subject:</b=
> Re: [Secdispatch] DTLS - EDHOC &lt;=3D 32<u></u><u></u></p></div></div><p=
 class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><div><p class=3D"MsoNorma=
l">I&#39;ve been thinking a bit about the use of a key_id as an optimizatio=
n<br>to avoid carrying the key, and I think it might be a source of<br>iden=
tity misbinding attacks. Note that this is not an issue specifically<u></u>=
<u></u></p></div><div><p class=3D"MsoNormal">to EDHOC or cTLS or whatever, =
it can happen whenever you use<u></u><u></u></p></div><div><p class=3D"MsoN=
ormal">this optimization.<u></u><u></u></p></div><div><p class=3D"MsoNormal=
"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal" style=3D"margin=
-bottom:12pt">Consider the case where Alice has accounts with both Bob and =
the<br>Attacker. Alice uses a certificate for authentication both Bob and t=
he<br>Attacker have registered key_ids with Alice.. Specifically, they have=
<br>both registered Key_ID=3D0 and Key=3DK_Bob. Obviously, the Attacker<br>=
doesn&#39;t have the private key for Bob, but this can still happen if<br>A=
lice doesn&#39;t check for PoP.<br><br>In this case, there&#39;s a trivial =
identity misbinding attack if the<br>attacker can get Alice to connect to i=
t, namely:<br><br>Alice=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Attac=
ker=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Bob<br><br>g^x=
 -&gt;<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 g^x -&gt;<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;- g^y, ID=3D0, Sign=
(K_b, .) ...<br>=C2=A0&lt;- g^y, ID=3D0, Sign(K_b, ..) ...<br><br>CERT, Sig=
n(K_a, .) ... -&gt;<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 CERT, Sign(K_a, .) ... -&gt; <br><br><br>This is really just another fl=
avor of the usual misbinding attack<br>based on someone claiming to have an=
other person&#39;s public key<br>without PoP verification.<br><br>The class=
ic defense in SIGMA is that the identities are folded into<br>the handshake=
 transcript, but the problem is that if the identities<br>are self-asserted=
 or public keys, you can get identity misbinding as<br>above (see also<br><=
a href=3D"https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/" targ=
et=3D"_blank">https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-uks/</=
a> for<br>another example of how this can happen).<br><br>-Ekr<br><br><br><=
u></u><u></u></p></div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p=
><div><div><p class=3D"MsoNormal">On Tue, Mar 5, 2019 at 7:09 AM Benjamin K=
aduk &lt;<a href=3D"mailto:kaduk@mit.edu" target=3D"_blank">kaduk@mit.edu</=
a>&gt; wrote:<u></u><u></u></p></div><blockquote style=3D"border-color:curr=
entcolor currentcolor currentcolor rgb(204,204,204);border-style:none none =
none solid;border-width:medium medium medium 1pt;padding:0in 0in 0in 6pt;ma=
rgin-left:4.8pt;margin-right:0in"><p class=3D"MsoNormal">On Tue, Mar 05, 20=
19 at 06:10:02AM -0800, Eric Rescorla wrote:<br>&gt; Hi folks,<br>&gt; <br>=
&gt; While I think Richard&#39;s characterization of fTLS is strictly corre=
ct,<br>&gt; I agree you have to squint a bit to see that it&#39;s isomorphi=
c to<br>&gt; TLS 1.3. In the spirit of clarity, I&#39;ve put together the f=
ollowing<br>&gt; very rough draft:<br>&gt; <br>&gt;=C2=A0 =C2=A0 <a href=3D=
"https://github.com/ekr/draft-rescorla-tls-ctls" target=3D"_blank">https://=
github.com/ekr/draft-rescorla-tls-ctls</a><br><br>Thanks for thinking about=
 this more.=C2=A0 I think that Richard&#39;s analysis (with<br>Jim&#39;s co=
rrections) did get to the crux of the issue, which is that the<br>clever en=
coding games are easy to adjust, and the cryptographic content of<br>the me=
ssages is most important.<br><br>&gt;[...]<br><br>&gt; There are some obvio=
us avenues to shave a few bytes here and there,<br>&gt; mostly because I di=
d a sort of straight translation of TLS 1.3, so for<br>&gt; instance, there=
 are empty EE and CR messages, and you could omit<br>&gt; length fields for=
 some fixed-length or deterministic HS messages. I<br>&gt; didn&#39;t bothe=
r with this because it&#39;s more in the way of a POC and, as<br>&gt; Richa=
rd noted, most of the size difference between this and EDHOC is<br>&gt; the=
 Randoms and the Finished.<br><br>In particular, while we may have to defer=
 to the cryptographers about<br>proving whether using the AEAD tag to perfo=
rm the role that TLS&#39;s distinct<br>Finished message does, there are som=
e clear engineering tradeoffs in<br>whether or not to omit the Randoms, and=
 I hope we can set ourselves up for<br>a productive discussion of that ques=
tion.=C2=A0 (That is, I wouldn&#39;t worry too<br>much about tidying up cTL=
S right away.)<br><br>I&#39;d also be interested in hearing more about what=
 the EDHOC team&#39;s internal<br>success criteria were (i.e., how they dec=
ided it was &quot;done&quot; enough to bring<br>to the IETF).=C2=A0 Here in=
 SECDISPATCH we&#39;ll in effect be coming up with a<br>new/rehashed proble=
m statement and success criteria for the IETF<br>application, but having a =
solid starting point from the preexisting work<br>could help our efficiency=
 a lot.<br><br>-Ben<u></u><u></u></p></blockquote></div></div></div></div><=
/blockquote></div></div>

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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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Subject: [Secdispatch] Power measurements
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Hi all,

Yesterday a few measurements of 3GPP & LoRAWAN power measurements were pres=
ented. I asked whether the provided data are estimates based on some model =
or whether they are the results of some measurements.

During the call the answer to that question could not be provided. It would=
 be interesting to double-check this.

Ciao
Hannes

IMPORTANT NOTICE: The contents of this email and any attachments are confid=
ential and may also be privileged. If you are not the intended recipient, p=
lease notify the sender immediately and do not disclose the contents to any=
 other person, use it for any purpose, or store or copy the information in =
any medium. Thank you.

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi all, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yesterday a few measurements of=
 3GPP &amp; LoRAWAN power measurements were presented. I asked whether the =
provided data are estimates based on some model or whether they are the res=
ults of some measurements.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">During the call the answer to t=
hat question could not be provided. It would be interesting to double-check=
 this.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Ciao<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hannes<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
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 or store or copy the information in any medium. Thank you.
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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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Subject: [Secdispatch] OMA SpecWorks - E2E Security
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Hi all,

I thought it would be useful to clarify the presentation Goeran made yester=
day about the e2e security features in LwM2M. I didn't want to use the valu=
able meeting time for such purpose.

Goeran referred to a whitepaper and showed a picture that illustrated an en=
d-to-end security use case in an NB IoT scenarios using various proxies/gat=
eways.

The mentioned whitepaper has not been approved in OMA SpecWorks and has not=
 been published yet.

More importantly though the LwM2M specifications do not contain any proxy/g=
ateway support. The work was planned but due to lack of interest did not pr=
ocess. Additionally, the LwM2M architecture does not describe how end-to-en=
d communication happens, i.e. the communication is only described between t=
he a LwM2M-enabled IoT device and the device management server. The interac=
tion with an application server is outside the scope of LwM2M.

Members in OMA have offered end-to-end security solutions on top of LwM2M. =
If you care to hear what we did, drop me an email.

Ciao
Hannes

IMPORTANT NOTICE: The contents of this email and any attachments are confid=
ential and may also be privileged. If you are not the intended recipient, p=
lease notify the sender immediately and do not disclose the contents to any=
 other person, use it for any purpose, or store or copy the information in =
any medium. Thank you.

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi all, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I thought it would be useful to=
 clarify the presentation Goeran made yesterday about the e2e security feat=
ures in LwM2M. I didn&#8217;t want to use the valuable meeting time for suc=
h purpose.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Goeran referred to a whitepaper=
 and showed a picture that illustrated an end-to-end security use case in a=
n NB IoT scenarios using various proxies/gateways.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The mentioned whitepaper has no=
t been approved in OMA SpecWorks and has not been published yet.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">More importantly though the LwM=
2M specifications do not contain any proxy/gateway support. The work was pl=
anned but due to lack of interest did not process. Additionally, the LwM2M =
architecture does not describe how end-to-end
 communication happens, i.e. the communication is only described between th=
e a LwM2M-enabled IoT device and the device management server. The interact=
ion with an application server is outside the scope of LwM2M.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Members in OMA have offered end=
-to-end security solutions on top of LwM2M. If you care to hear what we did=
, drop me an email.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Ciao<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hannes<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
IMPORTANT NOTICE: The contents of this email and any attachments are confid=
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lease notify the sender immediately and do not disclose the contents to any=
 other person, use it for any purpose,
 or store or copy the information in any medium. Thank you.
</body>
</html>

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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/5AXXROqVmrKoH5IEuYb0NoQhZDc>
Subject: [Secdispatch] MTU Size
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Hi all,

During the meeting, almost randomly, the design goal of being able to put k=
ey exchange messages into the MTU size was brought up. Unfortunately, it wa=
s unclear what the MTU size for the key exchange protocol for the different=
 radio technologies is. There was some discussion on the Webex chat but it =
might be worthwhile to repeat it on the list.

So, what are the size constraints a key exchange protocol has to work with =
for

  *   6tisch
  *   LoRA WAN
  *   SMS (who cares?)
  *   NB IOT

Ciao
Hannes

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi all, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">During the meeting, almost rand=
omly, the design goal of being able to put key exchange messages into the M=
TU size was brought up. Unfortunately, it was unclear what the MTU size for=
 the key exchange protocol for the different
 radio technologies is. There was some discussion on the Webex chat but it =
might be worthwhile to repeat it on the list.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">So, what are the size constrain=
ts a key exchange protocol has to work with for
<o:p></o:p></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo1"><span lang=3D"EN-US">6tisch<o:p></o:p></span></li><li class=3D"MsoLis=
tParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 lfo1"><span lang=3D=
"EN-US">LoRA WAN<o:p></o:p></span></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0cm;mso-list:l0 level1 lfo1"><span lang=3D"EN-US">SMS (who =
cares?)<o:p></o:p></span></li><li class=3D"MsoListParagraph" style=3D"margi=
n-left:0cm;mso-list:l0 level1 lfo1"><span lang=3D"EN-US">NB IOT<o:p></o:p><=
/span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Ciao<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hannes<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
IMPORTANT NOTICE: The contents of this email and any attachments are confid=
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</body>
</html>

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From nobody Wed Mar  6 05:18:06 2019
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To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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Subject: Re: [Secdispatch] Power measurements
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On Mar 6, 2019, at 13:21, Hannes Tschofenig <Hannes.Tschofenig@arm.com> =
wrote:
>=20
> Hi all,=20
> =20
> Yesterday a few measurements of 3GPP & LoRAWAN power measurements were =
presented. I asked whether the provided data are estimates based on some =
model or whether they are the results of some measurements.

Imagine the estimates were made on the back of an envelope, informed by =
some measurements but not by measuring exactly what was postulated.
I understand we are all curious (I certainly am), but for the purposes =
of secdispatch:
How would it help to know the detailed technique that was employed?

The design technique that led to EDHOC could be termed ALARA (as low as =
reasonably achievable): If there is an opportunity to reduce the cost, =
we are happy if that can be used.
Of course, we need to clarify what is =E2=80=9Creasonable=E2=80=9D =
(e.g., losing some security was =E2=80=9Creasonable=E2=80=9D for TLS 1.3 =
0RTT because it was believed that property can be explained).
Data from the various deployment environments can help us decide whether =
we are there yet.
But that decision is a bit like the influence of patents: Every one of =
us has to make it; there won=E2=80=99t be consensus about the criteria, =
and trying to generate a consensus document about that would be so =
ludricous that it would be obvious why people want that.

It is good that work on making (D)TLS more compact continues.  It =
started with DTLS 1.3, and once that is done, we will immediately be =
able to take advantage of that for CoAP.  There is also the ATLAS work.  =
Work on what I=E2=80=99ll call cutlass (=E2=80=9CcTLS=E2=80=9D) is just =
starting, and I=E2=80=99m looking forward to an even more concise =
version of (D)TLS.  But it is not a given that what is =E2=80=9Creasonable=
=E2=80=9D for EDHOC will turn out =E2=80=9Creasonable=E2=80=9D for the =
TLS brand, so I=E2=80=99m not holding by breath.  And I don=E2=80=99t =
have to, because EDHOC is there. =20

Gr=C3=BC=C3=9Fe, Carsten


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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
To: Carsten Bormann <cabo@tzi.org>
CC: "secdispatch@ietf.org" <secdispatch@ietf.org>
Thread-Topic: [Secdispatch] Power measurements
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Subject: Re: [Secdispatch] Power measurements
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From: Carsten Bormann <cabo@tzi.org>
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To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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Subject: Re: [Secdispatch] Power measurements
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On Mar 6, 2019, at 14:25, Hannes Tschofenig <Hannes.Tschofenig@arm.com> =
wrote:
>=20
> If I see a presentation where performance values are presented then I =
want to know how those were created. Maybe there is something =
interesting that can be learned from it.

Certainly (and acknowledged in my previous message), but you sent this =
message to the secdispatch mailing list.
My comments were more of a reaction to yesterday=E2=80=99s interim, =
sorry for mixing this up.

Gr=C3=BC=C3=9Fe, Carsten


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To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, "secdispatch@ietf.org" <secdispatch@ietf.org>
Thread-Topic: [Secdispatch] OMA SpecWorks - E2E Security
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Subject: Re: [Secdispatch] OMA SpecWorks - E2E Security
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From: =?UTF-8?B?TWFsacWhYSBWdcSNaW5pxIc=?= <malisa.vucinic@inria.fr>
Date: Wed, 6 Mar 2019 16:00:17 +0100
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To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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Subject: Re: [Secdispatch] MTU Size
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Hello Hannes,

Thanks for bringing this up. I have to say that until the meeting yesterday
I wasn't aware that "*rap" or "*rappy networks" was an appropriate language
for an interim meeting to describe IoT technologies but maybe it's my short
experience in the IETF that is to blame.

Regarding the overhead, I have put together a google doc summarizing the
overhead in 6TiSCH during the network access authentication and key
exchange. We do need to make a number of assumptions to get to a "concrete"
number that you are requesting, for example how efficiently can we compress
EUI-64s or how many hops are there in the network. I have documented some
reasonable values in the document. Please let me know if you need more
details on this.

https://docs.google.com/document/d/1wLoIexMLG3U9iYO5hzGzKjkvi-VDndQBbYRNsMU=
lh-k


Mali=C5=A1a

On Wed, Mar 6, 2019 at 1:55 PM Hannes Tschofenig <Hannes.Tschofenig@arm.com=
>
wrote:

> Hi all,
>
>
>
> During the meeting, almost randomly, the design goal of being able to put
> key exchange messages into the MTU size was brought up. Unfortunately, it
> was unclear what the MTU size for the key exchange protocol for the
> different radio technologies is. There was some discussion on the Webex
> chat but it might be worthwhile to repeat it on the list.
>
>
>
> So, what are the size constraints a key exchange protocol has to work wit=
h
> for
>
>    - 6tisch
>    - LoRA WAN
>    - SMS (who cares?)
>    - NB IOT
>
>
>
> Ciao
>
> Hannes
>
>
> IMPORTANT NOTICE: The contents of this email and any attachments are
> confidential and may also be privileged. If you are not the intended
> recipient, please notify the sender immediately and do not disclose the
> contents to any other person, use it for any purpose, or store or copy th=
e
> information in any medium. Thank you.
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>

--000000000000272d0505836e40b3
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<div dir=3D"ltr">Hello Hannes,<div><br></div><div>Thanks for bringing this =
up. I have to say that until the meeting yesterday I wasn&#39;t aware that =
&quot;*rap&quot; or &quot;*rappy networks&quot; was an appropriate language=
 for an interim meeting to describe IoT technologies but maybe it&#39;s my =
short experience in the IETF that is to blame.</div><div><br></div><div>Reg=
arding the overhead, I have put together a google doc summarizing the overh=
ead in 6TiSCH during the network access authentication and key exchange. We=
 do need to make a number of assumptions to get to a &quot;concrete&quot; n=
umber that you are requesting, for example how efficiently can we compress =
EUI-64s or how many hops are there in the network. I have documented some r=
easonable values in the document. Please let me know if you need more detai=
ls on this.<br></div><div><br></div><div><a href=3D"https://docs.google.com=
/document/d/1wLoIexMLG3U9iYO5hzGzKjkvi-VDndQBbYRNsMUlh-k">https://docs.goog=
le.com/document/d/1wLoIexMLG3U9iYO5hzGzKjkvi-VDndQBbYRNsMUlh-k</a>=C2=A0<br=
></div><div><br></div><div>Mali=C5=A1a</div><div><br></div><div><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Mar 6, 2019 =
at 1:55 PM Hannes Tschofenig &lt;<a href=3D"mailto:Hannes.Tschofenig@arm.co=
m">Hannes.Tschofenig@arm.com</a>&gt; wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex">





<div lang=3D"EN-GB" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"m_-6810152062500426217WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi all, <u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">During the meeting, almost rand=
omly, the design goal of being able to put key exchange messages into the M=
TU size was brought up. Unfortunately, it was unclear what the MTU size for=
 the key exchange protocol for the different
 radio technologies is. There was some discussion on the Webex chat but it =
might be worthwhile to repeat it on the list.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">So, what are the size constrain=
ts a key exchange protocol has to work with for
<u></u><u></u></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"m_-6810152062500426217MsoListParagraph" style=3D"margin-left:0=
cm"><span lang=3D"EN-US">6tisch<u></u><u></u></span></li><li class=3D"m_-68=
10152062500426217MsoListParagraph" style=3D"margin-left:0cm"><span lang=3D"=
EN-US">LoRA WAN<u></u><u></u></span></li><li class=3D"m_-681015206250042621=
7MsoListParagraph" style=3D"margin-left:0cm"><span lang=3D"EN-US">SMS (who =
cares?)<u></u><u></u></span></li><li class=3D"m_-6810152062500426217MsoList=
Paragraph" style=3D"margin-left:0cm"><span lang=3D"EN-US">NB IOT<u></u><u><=
/u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Ciao<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hannes<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
IMPORTANT NOTICE: The contents of this email and any attachments are confid=
ential and may also be privileged. If you are not the intended recipient, p=
lease notify the sender immediately and do not disclose the contents to any=
 other person, use it for any purpose,
 or store or copy the information in any medium. Thank you.
</div>

_______________________________________________<br>
Secdispatch mailing list<br>
<a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@ietf.=
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<a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispatch</=
a><br>
</blockquote></div></div></div>

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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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From: =?UTF-8?B?TWFsacWhYSBWdcSNaW5pxIc=?= <malisa.vucinic@inria.fr>
Date: Wed, 6 Mar 2019 16:17:47 +0100
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To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
Cc: "secdispatch@ietf.org" <secdispatch@ietf.org>
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Subject: Re: [Secdispatch] MTU Size
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The 47 / 45 bytes figure before a packet is fragmented already includes the
CoAP header+options, and this refers to the network access phase. Once the
node joins and does not have to go over a proxy to reach the outside world,
the numbers go up.

Mali=C5=A1a

On Wed, Mar 6, 2019 at 4:07 PM Hannes Tschofenig <Hannes.Tschofenig@arm.com=
>
wrote:

> Hi Malisa,
>
>
>
> Thanks for the numbers for the 6tisch network. If I understand your Excel
> sheet correctly then the max size a CoAP packet can have on the 6tisch
> network for uplink communication is 47 bytes and downlink is 45 bytes. Th=
e
> CoAP packet overhead is potentially 25 bytes (without OSCORE and the key
> management).
>
> This means that we have 20 bytes for OSCORE and key management in 6tisch
> networks. Is this correct?
>
>
>
> Great to hear that you like my comments.
>
>
>
> Ciao
>
>
> Hannes
>
>
>
> *From:* Mali=C5=A1a Vu=C4=8Dini=C4=87 <malisa.vucinic@inria.fr>
> *Sent:* Mittwoch, 6. M=C3=A4rz 2019 16:00
> *To:* Hannes Tschofenig <Hannes.Tschofenig@arm.com>
> *Cc:* secdispatch@ietf.org
> *Subject:* Re: [Secdispatch] MTU Size
>
>
>
> Hello Hannes,
>
>
>
> Thanks for bringing this up. I have to say that until the meeting
> yesterday I wasn't aware that "*rap" or "*rappy networks" was an
> appropriate language for an interim meeting to describe IoT technologies
> but maybe it's my short experience in the IETF that is to blame.
>
>
>
> Regarding the overhead, I have put together a google doc summarizing the
> overhead in 6TiSCH during the network access authentication and key
> exchange. We do need to make a number of assumptions to get to a "concret=
e"
> number that you are requesting, for example how efficiently can we compre=
ss
> EUI-64s or how many hops are there in the network. I have documented some
> reasonable values in the document. Please let me know if you need more
> details on this.
>
>
>
>
> https://docs.google.com/document/d/1wLoIexMLG3U9iYO5hzGzKjkvi-VDndQBbYRNs=
MUlh-k
>
>
>
>
> Mali=C5=A1a
>
>
>
> On Wed, Mar 6, 2019 at 1:55 PM Hannes Tschofenig <
> Hannes.Tschofenig@arm.com> wrote:
>
> Hi all,
>
>
>
> During the meeting, almost randomly, the design goal of being able to put
> key exchange messages into the MTU size was brought up. Unfortunately, it
> was unclear what the MTU size for the key exchange protocol for the
> different radio technologies is. There was some discussion on the Webex
> chat but it might be worthwhile to repeat it on the list.
>
>
>
> So, what are the size constraints a key exchange protocol has to work wit=
h
> for
>
>    - 6tisch
>    - LoRA WAN
>    - SMS (who cares?)
>    - NB IOT
>
>
>
> Ciao
>
> Hannes
>
>
>
> IMPORTANT NOTICE: The contents of this email and any attachments are
> confidential and may also be privileged. If you are not the intended
> recipient, please notify the sender immediately and do not disclose the
> contents to any other person, use it for any purpose, or store or copy th=
e
> information in any medium. Thank you.
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>
> IMPORTANT NOTICE: The contents of this email and any attachments are
> confidential and may also be privileged. If you are not the intended
> recipient, please notify the sender immediately and do not disclose the
> contents to any other person, use it for any purpose, or store or copy th=
e
> information in any medium. Thank you.
>

--000000000000a5c55505836e7ed0
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">The 47 / 45 bytes figure before a packet is fragmented alr=
eady includes the CoAP header+options, and this refers to the network acces=
s phase. Once the node joins and does not have to go over a proxy to reach =
the outside world, the numbers go up.<div><br></div><div>Mali=C5=A1a<br><br=
><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, M=
ar 6, 2019 at 4:07 PM Hannes Tschofenig &lt;<a href=3D"mailto:Hannes.Tschof=
enig@arm.com">Hannes.Tschofenig@arm.com</a>&gt; wrote:<br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex">





<div lang=3D"EN-GB" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-4272999179589847982WordSection1">
<p class=3D"MsoNormal">Hi Malisa, <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Thanks for the numbers for the 6tisch network. If I =
understand your Excel sheet correctly then the max size a CoAP packet can h=
ave on the 6tisch network for uplink communication is 47 bytes and downlink=
 is 45 bytes. The CoAP packet overhead
 is potentially 25 bytes (without OSCORE and the key management).<u></u><u>=
</u></p>
<p class=3D"MsoNormal">This means that we have 20 bytes for OSCORE and key =
management in 6tisch networks. Is this correct?
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Great to hear that you like my comments. <u></u><u><=
/u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Ciao</p></div></div><div lang=3D"EN-GB" link=3D"blue=
" vlink=3D"purple"><div class=3D"m_-4272999179589847982WordSection1"><p cla=
ss=3D"MsoNormal"><br>
Hannes<u></u><u></u></p></div></div><div lang=3D"EN-GB" link=3D"blue" vlink=
=3D"purple"><div class=3D"m_-4272999179589847982WordSection1">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Mali=C5=A1a Vu=C4=8Dini=C4=87 &lt;<a href=3D"mailto:malisa.vuci=
nic@inria.fr" target=3D"_blank">malisa.vucinic@inria.fr</a>&gt;
<br>
<b>Sent:</b> Mittwoch, 6. M=C3=A4rz 2019 16:00<br>
<b>To:</b> Hannes Tschofenig &lt;<a href=3D"mailto:Hannes.Tschofenig@arm.co=
m" target=3D"_blank">Hannes.Tschofenig@arm.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:secdispatch@ietf.org" target=3D"_blank">secdis=
patch@ietf.org</a><br>
<b>Subject:</b> Re: [Secdispatch] MTU Size<u></u><u></u></span></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hello Hannes,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks for bringing this up. I have to say that unti=
l the meeting yesterday I wasn&#39;t aware that &quot;*rap&quot; or &quot;*=
rappy networks&quot; was an appropriate language for an interim meeting to =
describe IoT technologies but maybe it&#39;s my short experience
 in the IETF that is to blame.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regarding the overhead, I have put together a google=
 doc summarizing the overhead in 6TiSCH during the network access authentic=
ation and key exchange. We do need to make a number of assumptions to get t=
o a &quot;concrete&quot; number that you are
 requesting, for example how efficiently can we compress EUI-64s or how man=
y hops are there in the network. I have documented some reasonable values i=
n the document. Please let me know if you need more details on this.<u></u>=
<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><a href=3D"https://docs.google.com/document/d/1wLoIe=
xMLG3U9iYO5hzGzKjkvi-VDndQBbYRNsMUlh-k" target=3D"_blank">https://docs.goog=
le.com/document/d/1wLoIexMLG3U9iYO5hzGzKjkvi-VDndQBbYRNsMUlh-k</a>=C2=A0<u>=
</u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Mali=C5=A1a<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal">On Wed, Mar 6, 2019 at 1:55 PM Hannes Tschofenig &lt=
;<a href=3D"mailto:Hannes.Tschofenig@arm.com" target=3D"_blank">Hannes.Tsch=
ofenig@arm.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi all,
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">During the meeting, almost rand=
omly, the design goal of being able to put key exchange messages into the M=
TU size was brought up. Unfortunately, it was unclear
 what the MTU size for the key exchange protocol for the different radio te=
chnologies is. There was some discussion on the Webex chat but it might be =
worthwhile to repeat it on the list.
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">So, what are the size constrain=
ts a key exchange protocol has to work with for
</span><u></u><u></u></p>
<ul type=3D"disc">
<li class=3D"m_-4272999179589847982m-6810152062500426217msolistparagraph">
<span lang=3D"EN-US">6tisch</span><u></u><u></u></li><li class=3D"m_-427299=
9179589847982m-6810152062500426217msolistparagraph">
<span lang=3D"EN-US">LoRA WAN</span><u></u><u></u></li><li class=3D"m_-4272=
999179589847982m-6810152062500426217msolistparagraph">
<span lang=3D"EN-US">SMS (who cares?)</span><u></u><u></u></li><li class=3D=
"m_-4272999179589847982m-6810152062500426217msolistparagraph">
<span lang=3D"EN-US">NB IOT</span><u></u><u></u></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Ciao</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hannes</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
<p class=3D"MsoNormal">IMPORTANT NOTICE: The contents of this email and any=
 attachments are confidential and may also be privileged. If you are not th=
e intended recipient, please notify the sender immediately and do not discl=
ose the contents to any other person,
 use it for any purpose, or store or copy the information in any medium. Th=
ank you.
<u></u><u></u></p>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
Secdispatch mailing list<br>
<a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@ietf.=
org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" target=3D"_bl=
ank">https://www.ietf.org/mailman/listinfo/secdispatch</a><u></u><u></u></p=
>
</blockquote>
</div>
</div>
</div>
</div></div><div lang=3D"EN-GB" link=3D"blue" vlink=3D"purple">
IMPORTANT NOTICE: The contents of this email and any attachments are confid=
ential and may also be privileged. If you are not the intended recipient, p=
lease notify the sender immediately and do not disclose the contents to any=
 other person, use it for any purpose,
 or store or copy the information in any medium. Thank you.
</div></blockquote></div></div></div>

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--_000_VI1PR0801MB211221193607D6855F92480AFA730VI1PR0801MB2112_--


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Subject: Re: [Secdispatch] Power measurements
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Hello everyone,

In the particular case of LoRaWAN, the power consumption is calculated 
by Time-on-Air (ToA) of the message
times the power consumption of the module during transmission.

Short answer:

We calculated the exchange for the most adverse conditions possible: 
fixing LoRaWAN DataRate to a value of 0 (roughly 293 bps).
Add all the packet transmission times and multiply by the power 
consumption of your particular LoRaWAN device.

The details of the exchange shown during the dispatch are disclosed in 
detail here:

https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN-Backoff-Time-Lower-Bound.xls

More in depth answer: (Apologies for the lengthy email)

Every region regulation specifies a maximum radiated power, e.g. in 
Europe ETSI 300 220
defines a maximum radiated power in 868 MHz Radio band of 25 mW 
(~14dBm). LoRaWAN
end-devices follow that regulation and thus transmit at 14 dBm maximum.

Even if the ETSI regulation specifies a maximum radiated power of 25mW 
(14dBm), each
certified LoRaWAN radio module will employ different currents because 
different implementations
are more or less efficient with power. This is Dependant on every device 
and specified in the datasheet.

On the other hand, the Time-on-Air is independent of the device. It will 
be the same for every LoRaWAN device.

*How to calculate power consumption in LoRaWAN*

You multiply the ToA times the power consumption during transmission.

To get the ToA:

ToA depends on two input factors: (i) size of the packet, and (ii) 
datarate configuration.

Officially, Semtech provides the /SemtechSX12X Calculator tool/ that can 
help you with these calculations.
Alternative tools to attain the same results are:

https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190
https://www.loratools.nl/#/airtime

The formal math is defined in /Lora Modem Design Guide SX1272/3/6/7/8: 
LoRa Modem Designer’s Guide AN1200.13/


To get the current:

- Use a multimeter on any LoRaWAN module you have around. Make the 
LoRaWAN module send any packet with a long ToA, e.g. a couple of 
seconds. Write down the current showed in the multimeter.
- If you don't have a device around to measure, In the datasheet of each 
module should come specified de mA needed during transmissions.
- Then you're set, just multiply the current times the voltage times the 
ToA and you'll get the mWh needed for a specific transmission.



Just to clarify, the power consumption of the module is NOT the same as 
the irradiated power of the antenna.
E.g. if the datasheet of a module says that the output power is 14 dBm, 
that equals 25 mW, those 25mW are not the
same thing as the power that the module is actually draining from the 
battery, hence I strongly suggest the multimeter
option.

As an example here is the hardware datasheet of the Microchip RN2483 Module:






Two things:

- In sleep mode some modules use a few µA of current, but you can 
alternatively save the data with a command and just turn it off (cut 
power entirely).
   This totally depends on the application and scenario in question.
- In Rx mode, the module also needs power, but it's maybe 1/3 or 1/4 of 
the TX power, not depreciable though, you need to take it also into account.

These values depend on the module you're dealing with, it's best to get 
an expert in electric design and make him read the hardware datasheets
before making any conclusions. Some manufactures try to get as much 
power efficiency as possible while other manufacturers
sell their modules for a cheaper price. It's a tradeoff.


Best Regards,


On 06/03/2019 14.43, Carsten Bormann wrote:
> On Mar 6, 2019, at 14:25, Hannes Tschofenig <Hannes.Tschofenig@arm.com> wrote:
>> If I see a presentation where performance values are presented then I want to know how those were created. Maybe there is something interesting that can be learned from it.
> Certainly (and acknowledged in my previous message), but you sent this message to the secdispatch mailing list.
> My comments were more of a reaction to yesterday’s interim, sorry for mixing this up.
>
> Grüße, Carsten
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch

-- 
Jesús Sánchez Gómez
+34 868 88 78 53
+34 635 33 26 09
jesus.sanchez4@um.es
Department of Information and Communication Engineering
Faculty of Computer Science
University of Murcia
30100 Murcia, Spain


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    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
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    Hello everyone,<br>
    <br>
    In the particular case of LoRaWAN, the power consumption is
    calculated by Time-on-Air (ToA) of the message<br>
    times the power consumption of the module during transmission.<br>
    <br>
    Short answer:<br>
    <br>
    We calculated the exchange for the most adverse conditions possible:
    fixing LoRaWAN DataRate to a value of 0 (roughly 293 bps).<br>
    Add all the packet transmission times and multiply by the power
    consumption of your particular LoRaWAN device.<br>
    <br>
    The details of the exchange shown during the dispatch are disclosed
    in detail here:<br>
    <br>
<a class="moz-txt-link-freetext" href="https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN-Backoff-Time-Lower-Bound.xls">https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN-Backoff-Time-Lower-Bound.xls</a><br>
    <br>
    More in depth answer: (Apologies for the lengthy email)<br>
    <br>
    Every region regulation specifies a maximum radiated power, e.g. in
    Europe ETSI 300 220<br>
    defines a maximum radiated power in 868 MHz Radio band of 25 mW
    (~14dBm). LoRaWAN<br>
    end-devices follow that regulation and thus transmit at 14 dBm
    maximum.<br>
    <br>
    Even if the ETSI regulation specifies a maximum radiated power of
    25mW (14dBm), each<br>
    certified LoRaWAN radio module will employ different currents
    because different implementations<br>
    are more or less efficient with power. This is Dependant on every
    device and specified in the datasheet.<br>
    <br>
    On the other hand, the Time-on-Air is independent of the device. It
    will be the same for every LoRaWAN device.<br>
    <br>
    <b>How to calculate power consumption in LoRaWAN</b><br>
    <br>
    You multiply the ToA times the power consumption during
    transmission.<br>
    <br>
    To get the ToA:<br>
    <br>
    ToA depends on two input factors: (i) size of the packet, and (ii)
    datarate configuration.<br>
    <br>
    Officially, Semtech provides the  <i>SemtechSX12X Calculator tool</i>
    that can help you with these calculations.<br>
    Alternative tools to attain the same results are:<br>
    <br>
<a class="moz-txt-link-freetext" href="https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190">https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190</a><br>
    <a class="moz-txt-link-freetext" href="https://www.loratools.nl/#/airtime">https://www.loratools.nl/#/airtime</a><br>
    <br>
    The formal math is defined in <i>Lora Modem Design Guide 
      SX1272/3/6/7/8: LoRa Modem Designer’s Guide AN1200.13</i><br>
    <br>
    <br>
    To get the current:<br>
    <br>
    - Use a multimeter on any LoRaWAN module you have around. Make the
    LoRaWAN module send any packet with a long ToA, e.g. a couple of
    seconds. Write down the current showed in the multimeter.<br>
    - If you don't have a device around to measure, In the datasheet of
    each module should come specified de mA needed during transmissions.<br>
    - Then you're set, just multiply the current times the voltage times
    the ToA and you'll get the mWh needed for a specific transmission.<br>
    <br>
    <br>
    <br>
    Just to clarify, the power consumption of the module is NOT the same
    as the irradiated power of the antenna.<br>
    E.g. if the datasheet of a module says that the output power is 14
    dBm, that equals 25 mW, those 25mW are not the<br>
    same thing as the power that the module is actually draining from
    the battery, hence I strongly suggest the multimeter<br>
    option.<br>
    <br>
    As an example here is the hardware datasheet of the Microchip RN2483
    Module:<br>
    <br>
    <br>
    <img src="cid:part1.A6375B97.E8FFDDC7@um.es" alt=""><br>
    <br>
    <br>
    <br>
    Two things:<br>
    <br>
    - In sleep mode some modules use a few µA of current, but you can
    alternatively save the data with a command and just turn it off (cut
    power entirely).<br>
      This totally depends on the application and scenario in question.<br>
    - In Rx mode, the module also needs power, but it's maybe 1/3 or 1/4
    of the TX power, not depreciable though, you need to take it also
    into account.<br>
    <br>
    These values depend on the module you're dealing with, it's best to
    get an expert in electric design and make him read the hardware
    datasheets<br>
    before making any conclusions. Some manufactures try to get as much
    power efficiency as possible while other manufacturers<br>
    sell their modules for a cheaper price. It's a tradeoff.<br>
    <br>
    <br>
    Best Regards,<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 06/03/2019 14.43, Carsten Bormann
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:BAFF5C62-6A8B-4C0B-A843-EB42471E02FB@tzi.org">
      <pre class="moz-quote-pre" wrap="">On Mar 6, 2019, at 14:25, Hannes Tschofenig <a class="moz-txt-link-rfc2396E" href="mailto:Hannes.Tschofenig@arm.com">&lt;Hannes.Tschofenig@arm.com&gt;</a> wrote:
</pre>
      <blockquote type="cite">
        <pre class="moz-quote-pre" wrap="">
If I see a presentation where performance values are presented then I want to know how those were created. Maybe there is something interesting that can be learned from it.
</pre>
      </blockquote>
      <pre class="moz-quote-pre" wrap="">
Certainly (and acknowledged in my previous message), but you sent this message to the secdispatch mailing list.
My comments were more of a reaction to yesterday’s interim, sorry for mixing this up.

Grüße, Carsten

_______________________________________________
Secdispatch mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Secdispatch@ietf.org">Secdispatch@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/secdispatch">https://www.ietf.org/mailman/listinfo/secdispatch</a>
</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Jesús Sánchez Gómez
+34 868 88 78 53
+34 635 33 26 09
<a class="moz-txt-link-abbreviated" href="mailto:jesus.sanchez4@um.es">jesus.sanchez4@um.es</a>
Department of Information and Communication Engineering
Faculty of Computer Science
University of Murcia
30100 Murcia, Spain</pre>
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--------------EB39B52BFF45140637675F56--

--------------4A16A07ACBFAEB24BAB5A1FA--


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To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, "secdispatch@ietf.org" <secdispatch@ietf.org>
Thread-Topic: [Secdispatch] Power measurements
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Subject: Re: [Secdispatch] Power measurements
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Thread-Topic: [Secdispatch] MTU Size
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Subject: Re: [Secdispatch] MTU Size
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References: <ECEE4A7E-5574-456E-90D7-62B014743CCC@ericsson.com> <VI1PR0801MB21125FE58124C22637D050F7FA730@VI1PR0801MB2112.eurprd08.prod.outlook.com>
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Subject: Re: [Secdispatch] Power measurements
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Hello Hannes,

Allow me to answer,

The excel only shows the Time-on-Air calculations based on the Semtech 
design. That is only
one of the input parameters.

During my research I've worked specifically with the Microchip RN2483 
(the defacto standard
certified LoraWAN Class A module) and the current measurements made with 
multimeters
were as specified in the datasheet (picture in my previous email).

As for the Time-on-Air, we haven't measured the RN2483 ToA because at 
the time we didn't have
the right gear for that, but in theory all LoRaWAN certified modules 
(i.e. RN2483) must obey those times
in order to sell the product. Otherwise it is impossible for the device 
to achieve LoRa Alliance
certification.

I did not conduct measurements with other LoRaWAN certified radio modems.

Best Regards,

On 06/03/2019 18.07, Hannes Tschofenig wrote:
>
> Hi Goeran,
>
> Has someone done measurement using real hardware? I can see the Excel 
> sheet and it appears that these are approximations.
>
> Ciao
>
> Hannes
>
> *From:*Göran Selander <goran.selander@ericsson.com>
> *Sent:* Mittwoch, 6. März 2019 17:30
> *To:* Hannes Tschofenig <Hannes.Tschofenig@arm.com>; secdispatch@ietf.org
> *Subject:* Re: [Secdispatch] Power measurements
>
> Hi Hannes,
>
> The benchmarks for 3GPP (NB-IoT) and LoRaWAN presented in the Interim 
> yesterday were based on the message size comparisons:
>
> Message size comparison
>
> ---
>
> Slide 31 contains the assumptions
>
> Slide 32 contains the comparison showing a factor 3 – 4 between EDHOC 
> and DTLS 1.3 message sizes
>
> NB-IoT Energy Consumption
>
> ---
>
> Slide 34 contains the assumptions
>
> Slide 35 contains the estimates showing a factor 2.2 – 3.3 in power 
> consumption between EDHOC and DTLS 1.3 message sizes
>
> The model for estimating energy consumption is a standard model used 
> in 3GPP and based on actual measurements. The calculations are here:
>
> https://github.com/EricssonResearch/EDHOC/blob/master/docs/NB%20IoT%20power%20consumption.xlsx
>
> LoRaWAN
>
> ---
>
> Slide 38 describes the model for estimating the backoff times
>
> Slide 39 contains the ToA and the backoff time estimates
>
> For LoRaWAN two quantities were compared. The Time-On-Air which is 
> related to power consumption and as input to the second quantity, the 
> backoff time. Spread sheets for ToA are available various sources e.g. 
> here 
> https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190 
>  The actual calculations were made using this spread sheet:
>
> https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN_ToA.xlsx
>
> The estimates for backoff time was made using this spread sheet.
>
> https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN-Backoff-Time-Lower-Bound.xls
>
> Let me know if you have further questions about the comparisons.
>
> Göran
>
> *From: *Secdispatch <secdispatch-bounces@ietf.org 
> <mailto:secdispatch-bounces@ietf.org>> on behalf of Hannes Tschofenig 
> <Hannes.Tschofenig@arm.com <mailto:Hannes.Tschofenig@arm.com>>
> *Date: *Wednesday, 6 March 2019 at 13:21
> *To: *"secdispatch@ietf.org <mailto:secdispatch@ietf.org>" 
> <secdispatch@ietf.org <mailto:secdispatch@ietf.org>>
> *Subject: *[Secdispatch] Power measurements
>
> Hi all,
>
> Yesterday a few measurements of 3GPP & LoRAWAN power measurements were 
> presented. I asked whether the provided data are estimates based on 
> some model or whether they are the results of some measurements.
>
> During the call the answer to that question could not be provided. It 
> would be interesting to double-check this.
>
> Ciao
>
> Hannes
>
> IMPORTANT NOTICE: The contents of this email and any attachments are 
> confidential and may also be privileged. If you are not the intended 
> recipient, please notify the sender immediately and do not disclose 
> the contents to any other person, use it for any purpose, or store or 
> copy the information in any medium. Thank you.
>
> IMPORTANT NOTICE: The contents of this email and any attachments are 
> confidential and may also be privileged. If you are not the intended 
> recipient, please notify the sender immediately and do not disclose 
> the contents to any other person, use it for any purpose, or store or 
> copy the information in any medium. Thank you.
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch

-- 
Jesús Sánchez Gómez
+34 868 88 78 53
+34 635 33 26 09
jesus.sanchez4@um.es
Department of Information and Communication Engineering
Faculty of Computer Science
University of Murcia
30100 Murcia, Spain


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    Hello Hannes,<br>
    <br>
    Allow me to answer,<br>
    <br>
    The excel only shows the Time-on-Air calculations based on the
    Semtech design. That is only<br>
    one of the input parameters.<br>
    <br>
    During my research I've worked specifically with the Microchip
    RN2483 (the defacto standard<br>
    certified LoraWAN Class A module) and the current measurements made
    with multimeters<br>
    were as specified in the datasheet (picture in my previous email).<br>
    <br>
    As for the Time-on-Air, we haven't measured the RN2483 ToA because
    at the time we didn't have<br>
    the right gear for that, but in theory all LoRaWAN certified modules
    (i.e. RN2483) must obey those times<br>
    in order to sell the product. Otherwise it is impossible for the
    device to achieve LoRa Alliance<br>
    certification.<br>
    <br>
    I did not conduct measurements with other LoRaWAN certified radio
    modems.<br>
    <br>
    Best Regards,<br>
    <br>
    <div class="moz-cite-prefix">On 06/03/2019 18.07, Hannes Tschofenig
      wrote:<br>
    </div>
    <blockquote type="cite"
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      <div class="WordSection1">
        <p class="MsoNormal">Hi Goeran, <o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Has someone done measurement using real
          hardware? I can see the Excel sheet and it appears that these
          are approximations.
          <o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Ciao<o:p></o:p></p>
        <p class="MsoNormal">Hannes<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <div>
          <div style="border:none;border-top:solid #E1E1E1
            1.0pt;padding:3.0pt 0cm 0cm 0cm">
            <p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
                lang="EN-US"> Göran Selander
                <a class="moz-txt-link-rfc2396E" href="mailto:goran.selander@ericsson.com">&lt;goran.selander@ericsson.com&gt;</a>
                <br>
                <b>Sent:</b> Mittwoch, 6. März 2019 17:30<br>
                <b>To:</b> Hannes Tschofenig
                <a class="moz-txt-link-rfc2396E" href="mailto:Hannes.Tschofenig@arm.com">&lt;Hannes.Tschofenig@arm.com&gt;</a>; <a class="moz-txt-link-abbreviated" href="mailto:secdispatch@ietf.org">secdispatch@ietf.org</a><br>
                <b>Subject:</b> Re: [Secdispatch] Power measurements<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span lang="SV">Hi Hannes,<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">The benchmarks for 3GPP
            (NB-IoT) and LoRaWAN presented in the Interim yesterday were
            based on the message size comparisons:<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Message size comparison<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Slide 31 contains the
            assumptions<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Slide 32 contains the
            comparison showing a factor 3 – 4 between EDHOC and DTLS 1.3
            message sizes<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">NB-IoT Energy
            Consumption<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Slide 34 contains the
            assumptions<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Slide 35 contains the
            estimates showing a factor 2.2 – 3.3 in power consumption
            between EDHOC and DTLS 1.3 message sizes<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">The model for estimating
            energy consumption is a standard model used in 3GPP and
            based on actual measurements. The calculations are here:
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><a
href="https://github.com/EricssonResearch/EDHOC/blob/master/docs/NB%20IoT%20power%20consumption.xlsx"
              moz-do-not-send="true">https://github.com/EricssonResearch/EDHOC/blob/master/docs/NB%20IoT%20power%20consumption.xlsx</a><o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">LoRaWAN<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Slide 38 describes the
            model for estimating the backoff times<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Slide 39 contains the
            ToA and the backoff time estimates<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">For LoRaWAN two
            quantities were compared. The Time-On-Air which is related
            to power consumption and as input to the second quantity,
            the backoff time. Spread sheets for ToA are available
            various sources e.g. here
            <a
href="https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190"
              moz-do-not-send="true">
https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190</a>
             The actual calculations were made using this spread sheet:<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><a
href="https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN_ToA.xlsx"
              moz-do-not-send="true">https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN_ToA.xlsx</a><o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">The estimates for
            backoff time was made using this spread sheet.<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><a
href="https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN-Backoff-Time-Lower-Bound.xls"
              moz-do-not-send="true">https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN-Backoff-Time-Lower-Bound.xls</a><o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Let me know if you have
            further questions about the comparisons.<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Göran<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
        <div style="border:none;border-top:solid #B5C4DF
          1.0pt;padding:3.0pt 0cm 0cm 0cm">
          <p class="MsoNormal" style="margin-left:36.0pt"><b><span
                style="font-size:12.0pt;color:black" lang="SV">From:
              </span></b><span style="font-size:12.0pt;color:black"
              lang="SV">Secdispatch &lt;<a
                href="mailto:secdispatch-bounces@ietf.org"
                moz-do-not-send="true">secdispatch-bounces@ietf.org</a>&gt;
              on behalf of Hannes Tschofenig &lt;<a
                href="mailto:Hannes.Tschofenig@arm.com"
                moz-do-not-send="true">Hannes.Tschofenig@arm.com</a>&gt;<br>
              <b>Date: </b>Wednesday, 6 March 2019 at 13:21<br>
              <b>To: </b>"<a href="mailto:secdispatch@ietf.org"
                moz-do-not-send="true">secdispatch@ietf.org</a>" &lt;<a
                href="mailto:secdispatch@ietf.org"
                moz-do-not-send="true">secdispatch@ietf.org</a>&gt;<br>
              <b>Subject: </b>[Secdispatch] Power measurements<o:p></o:p></span></p>
        </div>
        <div>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="SV"><o:p> </o:p></span></p>
        </div>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            lang="EN-US">Hi all, </span>
          <span lang="SV"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            lang="EN-US"> </span><span lang="SV"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            lang="EN-US">Yesterday a few measurements of 3GPP &amp;
            LoRAWAN power measurements were presented. I asked whether
            the provided data are estimates based on some model or
            whether they are the results of some measurements. </span><span
            lang="SV"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            lang="EN-US"> </span><span lang="SV"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            lang="EN-US">During the call the answer to that question
            could not be provided. It would be interesting to
            double-check this.</span><span lang="SV"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            lang="EN-US"> </span><span lang="SV"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            lang="EN-US">Ciao</span><span lang="SV"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            lang="EN-US">Hannes</span><span lang="SV"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            lang="EN-US"> </span><span lang="SV"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span lang="SV">IMPORTANT
            NOTICE: The contents of this email and any attachments are
            confidential and may also be privileged. If you are not the
            intended recipient, please notify the sender immediately and
            do not disclose the contents to any other person, use it for
            any purpose, or store or copy the information in any medium.
            Thank you.
            <o:p></o:p></span></p>
      </div>
      IMPORTANT NOTICE: The contents of this email and any attachments
      are confidential and may also be privileged. If you are not the
      intended recipient, please notify the sender immediately and do
      not disclose the contents to any other person, use it for any
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      you.
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <pre class="moz-quote-pre" wrap="">_______________________________________________
Secdispatch mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Secdispatch@ietf.org">Secdispatch@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/secdispatch">https://www.ietf.org/mailman/listinfo/secdispatch</a>
</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Jesús Sánchez Gómez
+34 868 88 78 53
+34 635 33 26 09
<a class="moz-txt-link-abbreviated" href="mailto:jesus.sanchez4@um.es">jesus.sanchez4@um.es</a>
Department of Information and Communication Engineering
Faculty of Computer Science
University of Murcia
30100 Murcia, Spain</pre>
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Subject: Re: [Secdispatch] OMA SpecWorks - E2E Security
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Subject: Re: [Secdispatch] MTU Size
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Subject: Re: [Secdispatch] Power measurements
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Hello Hannes,



On 06/03/2019 18.25, Hannes Tschofenig wrote:
>
> Hi Jesus,
>
> I wondering how the system design impacts the power consumption, 
> particularly since many IoT devices are not even single MCU designs.
>
> Just measuring the radio will give an artificial view. Did you explore 
> this aspect in your measurements?
>

We considered the RN2483 (LoRaWAN radio module) and the main MCU as 
different
entities during our measurements.

Our measurements at the time were very simple, focusing only on the RN2483.
In the particular case of the measurements of current, we placed a 
multimeter at the GND pin.

Just to clarify if I understood your question correctly, depending on 
the particular MCU
(e.g. ARM, MSP430, PIC32, etc) the power to communicate with the RN2483 
could be different:
whatever current the main MCU needs to talk with an USART and 
computation time of the instructions
dealing with the LoRaWAN commands and that is very hard to generalize.

I hope this was helpful.

Best Regards,

> Ciao
>
> Hannes
>
> *From:*Jesús Sánchez-Gómez <jesus.sanchez4@um.es>
> *Sent:* Mittwoch, 6. März 2019 18:19
> *To:* Hannes Tschofenig <Hannes.Tschofenig@arm.com>; secdispatch@ietf.org
> *Subject:* Re: [Secdispatch] Power measurements
>
> Hello Hannes,
>
> Allow me to answer,
>
> The excel only shows the Time-on-Air calculations based on the Semtech 
> design. That is only
> one of the input parameters.
>
> During my research I've worked specifically with the Microchip RN2483 
> (the defacto standard
> certified LoraWAN Class A module) and the current measurements made 
> with multimeters
> were as specified in the datasheet (picture in my previous email).
>
> As for the Time-on-Air, we haven't measured the RN2483 ToA because at 
> the time we didn't have
> the right gear for that, but in theory all LoRaWAN certified modules 
> (i.e. RN2483) must obey those times
> in order to sell the product. Otherwise it is impossible for the 
> device to achieve LoRa Alliance
> certification.
>
> I did not conduct measurements with other LoRaWAN certified radio modems.
>
> Best Regards,
>
> On 06/03/2019 18.07, Hannes Tschofenig wrote:
>
>     Hi Goeran,
>
>     Has someone done measurement using real hardware? I can see the
>     Excel sheet and it appears that these are approximations.
>
>     Ciao
>
>     Hannes
>
>     *From:*Göran Selander <goran.selander@ericsson.com>
>     <mailto:goran.selander@ericsson.com>
>     *Sent:* Mittwoch, 6. März 2019 17:30
>     *To:* Hannes Tschofenig <Hannes.Tschofenig@arm.com>
>     <mailto:Hannes.Tschofenig@arm.com>; secdispatch@ietf.org
>     <mailto:secdispatch@ietf.org>
>     *Subject:* Re: [Secdispatch] Power measurements
>
>     Hi Hannes,
>
>     The benchmarks for 3GPP (NB-IoT) and LoRaWAN presented in the
>     Interim yesterday were based on the message size comparisons:
>
>     Message size comparison
>
>     ---
>
>     Slide 31 contains the assumptions
>
>     Slide 32 contains the comparison showing a factor 3 – 4 between
>     EDHOC and DTLS 1.3 message sizes
>
>     NB-IoT Energy Consumption
>
>     ---
>
>     Slide 34 contains the assumptions
>
>     Slide 35 contains the estimates showing a factor 2.2 – 3.3 in
>     power consumption between EDHOC and DTLS 1.3 message sizes
>
>     The model for estimating energy consumption is a standard model
>     used in 3GPP and based on actual measurements. The calculations
>     are here:
>
>     https://github.com/EricssonResearch/EDHOC/blob/master/docs/NB%20IoT%20power%20consumption.xlsx
>
>     LoRaWAN
>
>     ---
>
>     Slide 38 describes the model for estimating the backoff times
>
>     Slide 39 contains the ToA and the backoff time estimates
>
>     For LoRaWAN two quantities were compared. The Time-On-Air which is
>     related to power consumption and as input to the second quantity,
>     the backoff time. Spread sheets for ToA are available various
>     sources e.g. here
>     https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190
>      The actual calculations were made using this spread sheet:
>
>     https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN_ToA.xlsx
>
>     The estimates for backoff time was made using this spread sheet.
>
>     https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN-Backoff-Time-Lower-Bound.xls
>
>     Let me know if you have further questions about the comparisons.
>
>     Göran
>
>     *From: *Secdispatch <secdispatch-bounces@ietf.org
>     <mailto:secdispatch-bounces@ietf.org>> on behalf of Hannes
>     Tschofenig <Hannes.Tschofenig@arm.com
>     <mailto:Hannes.Tschofenig@arm.com>>
>     *Date: *Wednesday, 6 March 2019 at 13:21
>     *To: *"secdispatch@ietf.org <mailto:secdispatch@ietf.org>"
>     <secdispatch@ietf.org <mailto:secdispatch@ietf.org>>
>     *Subject: *[Secdispatch] Power measurements
>
>     Hi all,
>
>     Yesterday a few measurements of 3GPP & LoRAWAN power measurements
>     were presented. I asked whether the provided data are estimates
>     based on some model or whether they are the results of some
>     measurements.
>
>     During the call the answer to that question could not be provided.
>     It would be interesting to double-check this.
>
>     Ciao
>
>     Hannes
>
>     IMPORTANT NOTICE: The contents of this email and any attachments
>     are confidential and may also be privileged. If you are not the
>     intended recipient, please notify the sender immediately and do
>     not disclose the contents to any other person, use it for any
>     purpose, or store or copy the information in any medium. Thank you.
>
>     IMPORTANT NOTICE: The contents of this email and any attachments
>     are confidential and may also be privileged. If you are not the
>     intended recipient, please notify the sender immediately and do
>     not disclose the contents to any other person, use it for any
>     purpose, or store or copy the information in any medium. Thank you.
>
>     _______________________________________________
>
>     Secdispatch mailing list
>
>     Secdispatch@ietf.org  <mailto:Secdispatch@ietf.org>
>
>     https://www.ietf.org/mailman/listinfo/secdispatch
>
>
>
> -- 
> Jesús Sánchez Gómez
> +34 868 88 78 53
> +34 635 33 26 09
> jesus.sanchez4@um.es  <mailto:jesus.sanchez4@um.es>
> Department of Information and Communication Engineering
> Faculty of Computer Science
> University of Murcia
> 30100 Murcia, Spain
> IMPORTANT NOTICE: The contents of this email and any attachments are 
> confidential and may also be privileged. If you are not the intended 
> recipient, please notify the sender immediately and do not disclose 
> the contents to any other person, use it for any purpose, or store or 
> copy the information in any medium. Thank you.
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch

-- 
Jesús Sánchez Gómez
+34 868 88 78 53
+34 635 33 26 09
jesus.sanchez4@um.es
Department of Information and Communication Engineering
Faculty of Computer Science
University of Murcia
30100 Murcia, Spain


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    Hello Hannes,<br>
    <br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 06/03/2019 18.25, Hannes Tschofenig
      wrote:<br>
    </div>
    <blockquote type="cite"
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      <div class="WordSection1">
        <p class="MsoNormal"><span style="color:windowtext">Hi Jesus, <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">I wondering
            how the system design impacts the power consumption,
            particularly since many IoT devices are not even single MCU
            designs.
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">Just
            measuring the radio will give an artificial view. Did you
            explore this aspect in your measurements?
          </span></p>
      </div>
    </blockquote>
    <br>
    We considered the RN2483 (LoRaWAN radio module) and the main MCU as
    different<br>
    entities during our measurements.<br>
    <br>
    Our measurements at the time were very simple, focusing only on the
    RN2483.<br>
    In the particular case of the measurements of current, we placed a
    multimeter at the GND pin.<br>
    <br>
    Just to clarify if I understood your question correctly, depending
    on the particular MCU<br>
    (e.g. ARM, MSP430, PIC32, etc) the power to communicate with the
    RN2483 could be different:<br>
    whatever current the main MCU needs to talk with an USART and
    computation time of the instructions<br>
    dealing with the LoRaWAN commands and that is very hard to
    generalize.<br>
    <br>
    I hope this was helpful.<br>
    <br>
    Best Regards,<br>
    <br>
    <blockquote type="cite"
cite="mid:VI1PR0801MB2112019D503D3C045F210788FA730@VI1PR0801MB2112.eurprd08.prod.outlook.com">
      <div class="WordSection1">
        <p class="MsoNormal"><span style="color:windowtext"><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">Ciao<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">Hannes<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #E1E1E1
            1.0pt;padding:3.0pt 0cm 0cm 0cm">
            <p class="MsoNormal"><b><span style="color:windowtext"
                  lang="EN-US">From:</span></b><span
                style="color:windowtext" lang="EN-US"> Jesús
                Sánchez-Gómez <a class="moz-txt-link-rfc2396E" href="mailto:jesus.sanchez4@um.es">&lt;jesus.sanchez4@um.es&gt;</a>
                <br>
                <b>Sent:</b> Mittwoch, 6. März 2019 18:19<br>
                <b>To:</b> Hannes Tschofenig
                <a class="moz-txt-link-rfc2396E" href="mailto:Hannes.Tschofenig@arm.com">&lt;Hannes.Tschofenig@arm.com&gt;</a>; <a class="moz-txt-link-abbreviated" href="mailto:secdispatch@ietf.org">secdispatch@ietf.org</a><br>
                <b>Subject:</b> Re: [Secdispatch] Power measurements<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal" style="margin-bottom:12.0pt">Hello Hannes,<br>
          <br>
          Allow me to answer,<br>
          <br>
          The excel only shows the Time-on-Air calculations based on the
          Semtech design. That is only<br>
          one of the input parameters.<br>
          <br>
          During my research I've worked specifically with the Microchip
          RN2483 (the defacto standard<br>
          certified LoraWAN Class A module) and the current measurements
          made with multimeters<br>
          were as specified in the datasheet (picture in my previous
          email).<br>
          <br>
          As for the Time-on-Air, we haven't measured the RN2483 ToA
          because at the time we didn't have<br>
          the right gear for that, but in theory all LoRaWAN certified
          modules (i.e. RN2483) must obey those times<br>
          in order to sell the product. Otherwise it is impossible for
          the device to achieve LoRa Alliance<br>
          certification.<br>
          <br>
          I did not conduct measurements with other LoRaWAN certified
          radio modems.<br>
          <br>
          Best Regards,<o:p></o:p></p>
        <div>
          <p class="MsoNormal">On 06/03/2019 18.07, Hannes Tschofenig
            wrote:<o:p></o:p></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal">Hi Goeran, <o:p></o:p></p>
          <p class="MsoNormal"> <o:p></o:p></p>
          <p class="MsoNormal">Has someone done measurement using real
            hardware? I can see the Excel sheet and it appears that
            these are approximations.
            <o:p></o:p></p>
          <p class="MsoNormal"> <o:p></o:p></p>
          <p class="MsoNormal">Ciao<o:p></o:p></p>
          <p class="MsoNormal">Hannes<o:p></o:p></p>
          <p class="MsoNormal"> <o:p></o:p></p>
          <div>
            <div style="border:none;border-top:solid #E1E1E1
              1.0pt;padding:3.0pt 0cm 0cm 0cm">
              <p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
                  lang="EN-US"> Göran Selander
                  <a href="mailto:goran.selander@ericsson.com"
                    moz-do-not-send="true">&lt;goran.selander@ericsson.com&gt;</a>
                  <br>
                  <b>Sent:</b> Mittwoch, 6. März 2019 17:30<br>
                  <b>To:</b> Hannes Tschofenig <a
                    href="mailto:Hannes.Tschofenig@arm.com"
                    moz-do-not-send="true">&lt;Hannes.Tschofenig@arm.com&gt;</a>;
                  <a href="mailto:secdispatch@ietf.org"
                    moz-do-not-send="true">secdispatch@ietf.org</a><br>
                  <b>Subject:</b> Re: [Secdispatch] Power measurements</span><o:p></o:p></p>
            </div>
          </div>
          <p class="MsoNormal"> <o:p></o:p></p>
          <p class="MsoNormal"><span lang="SV">Hi Hannes,</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">The benchmarks for
              3GPP (NB-IoT) and LoRaWAN presented in the Interim
              yesterday were based on the message size comparisons:</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">Message size
              comparison</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">---</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">Slide 31 contains the
              assumptions</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">Slide 32 contains the
              comparison showing a factor 3 – 4 between EDHOC and DTLS
              1.3 message sizes</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">NB-IoT Energy
              Consumption</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">---</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">Slide 34 contains the
              assumptions</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">Slide 35 contains the
              estimates showing a factor 2.2 – 3.3 in power consumption
              between EDHOC and DTLS 1.3 message sizes</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">The model for
              estimating energy consumption is a standard model used in
              3GPP and based on actual measurements. The calculations
              are here:
            </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"><a
href="https://github.com/EricssonResearch/EDHOC/blob/master/docs/NB%20IoT%20power%20consumption.xlsx"
                moz-do-not-send="true">https://github.com/EricssonResearch/EDHOC/blob/master/docs/NB%20IoT%20power%20consumption.xlsx</a></span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">LoRaWAN</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">---</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">Slide 38 describes the
              model for estimating the backoff times</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">Slide 39 contains the
              ToA and the backoff time estimates</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">For LoRaWAN two
              quantities were compared. The Time-On-Air which is related
              to power consumption and as input to the second quantity,
              the backoff time. Spread sheets for ToA are available
              various sources e.g. here
              <a
href="https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190"
                moz-do-not-send="true">
https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190</a>
               The actual calculations were made using this spread
              sheet:</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"><a
href="https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN_ToA.xlsx"
                moz-do-not-send="true">https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN_ToA.xlsx</a></span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">The estimates for
              backoff time was made using this spread sheet.</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"><a
href="https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN-Backoff-Time-Lower-Bound.xls"
                moz-do-not-send="true">https://github.com/EricssonResearch/EDHOC/blob/master/docs/LoRaWAN-Backoff-Time-Lower-Bound.xls</a></span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">Let me know if you
              have further questions about the comparisons.</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US">Göran</span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
          <div style="border:none;border-top:solid #B5C4DF
            1.0pt;padding:3.0pt 0cm 0cm 0cm">
            <p class="MsoNormal" style="margin-left:36.0pt"><b><span
                  style="font-size:12.0pt" lang="SV">From:
                </span></b><span style="font-size:12.0pt" lang="SV">Secdispatch
                &lt;<a href="mailto:secdispatch-bounces@ietf.org"
                  moz-do-not-send="true">secdispatch-bounces@ietf.org</a>&gt;
                on behalf of Hannes Tschofenig &lt;<a
                  href="mailto:Hannes.Tschofenig@arm.com"
                  moz-do-not-send="true">Hannes.Tschofenig@arm.com</a>&gt;<br>
                <b>Date: </b>Wednesday, 6 March 2019 at 13:21<br>
                <b>To: </b>"<a href="mailto:secdispatch@ietf.org"
                  moz-do-not-send="true">secdispatch@ietf.org</a>" &lt;<a
                  href="mailto:secdispatch@ietf.org"
                  moz-do-not-send="true">secdispatch@ietf.org</a>&gt;<br>
                <b>Subject: </b>[Secdispatch] Power measurements</span><o:p></o:p></p>
          </div>
          <div>
            <p class="MsoNormal" style="margin-left:36.0pt"><span
                lang="SV"> </span><o:p></o:p></p>
          </div>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="EN-US">Hi all, </span>
            <o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="EN-US">Yesterday a few measurements of 3GPP &amp;
              LoRAWAN power measurements were presented. I asked whether
              the provided data are estimates based on some model or
              whether they are the results of some measurements. </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="EN-US">During the call the answer to that question
              could not be provided. It would be interesting to
              double-check this.</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="EN-US">Ciao</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="EN-US">Hannes</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span
              lang="SV">IMPORTANT NOTICE: The contents of this email and
              any attachments are confidential and may also be
              privileged. If you are not the intended recipient, please
              notify the sender immediately and do not disclose the
              contents to any other person, use it for any purpose, or
              store or copy the information in any medium. Thank you.
            </span><o:p></o:p></p>
          <p class="MsoNormal">IMPORTANT NOTICE: The contents of this
            email and any attachments are confidential and may also be
            privileged. If you are not the intended recipient, please
            notify the sender immediately and do not disclose the
            contents to any other person, use it for any purpose, or
            store or copy the information in any medium. Thank you.
            <br>
            <br>
            <o:p></o:p></p>
          <pre>_______________________________________________<o:p></o:p></pre>
          <pre>Secdispatch mailing list<o:p></o:p></pre>
          <pre><a href="mailto:Secdispatch@ietf.org" moz-do-not-send="true">Secdispatch@ietf.org</a><o:p></o:p></pre>
          <pre><a href="https://www.ietf.org/mailman/listinfo/secdispatch" moz-do-not-send="true">https://www.ietf.org/mailman/listinfo/secdispatch</a><o:p></o:p></pre>
        </blockquote>
        <p class="MsoNormal"><br>
          <br>
          <o:p></o:p></p>
        <pre>-- <o:p></o:p></pre>
        <pre>Jesús Sánchez Gómez<o:p></o:p></pre>
        <pre>+34 868 88 78 53<o:p></o:p></pre>
        <pre>+34 635 33 26 09<o:p></o:p></pre>
        <pre><a href="mailto:jesus.sanchez4@um.es" moz-do-not-send="true">jesus.sanchez4@um.es</a><o:p></o:p></pre>
        <pre>Department of Information and Communication Engineering<o:p></o:p></pre>
        <pre>Faculty of Computer Science<o:p></o:p></pre>
        <pre>University of Murcia<o:p></o:p></pre>
        <pre>30100 Murcia, Spain<o:p></o:p></pre>
      </div>
      IMPORTANT NOTICE: The contents of this email and any attachments
      are confidential and may also be privileged. If you are not the
      intended recipient, please notify the sender immediately and do
      not disclose the contents to any other person, use it for any
      purpose, or store or copy the information in any medium. Thank
      you.
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <pre class="moz-quote-pre" wrap="">_______________________________________________
Secdispatch mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Secdispatch@ietf.org">Secdispatch@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/secdispatch">https://www.ietf.org/mailman/listinfo/secdispatch</a>
</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Jesús Sánchez Gómez
+34 868 88 78 53
+34 635 33 26 09
<a class="moz-txt-link-abbreviated" href="mailto:jesus.sanchez4@um.es">jesus.sanchez4@um.es</a>
Department of Information and Communication Engineering
Faculty of Computer Science
University of Murcia
30100 Murcia, Spain</pre>
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From nobody Thu Mar  7 05:54:10 2019
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Date: Thu, 7 Mar 2019 14:53:58 +0100 (CET)
From: Bernie Hoeneisen <bernie@ietf.hoeneisen.ch>
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Subject: [Secdispatch] New Version Notification for draft-birk-pep-03.txt
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Please be informed that an update of the Internet-Draft draft-birk-pep-03 
has just been published (see also below). It describes in general how pEp 
(pretty Easy privacy) works and it serves as a starting point for the 
MEDUP (Missing Elements for Decentralized and Usable Privacy) discussions.

Discussion of this Internet-Draft and other pEp related matters is 
taking place on the new MEDUP mailing list (medup@ietf.org) from now on.
To subscribe: https://www.ietf.org/mailman/listinfo/medup

Looking forward to all your comments and feedback on the new MEDUP mailing 
list!

All the best,
  Bernie

---------- Forwarded message ----------
Date: Thu, 7 Mar 2019 14:15:11
From: internet-drafts@ietf.org
Subject: New Version Notification for draft-birk-pep-03.txt


A new version of I-D, draft-birk-pep-03.txt
has been successfully submitted by Hernani Marques and posted to the
IETF repository.

Name:		draft-birk-pep
Revision:	03
Title:		pretty Easy privacy (pEp): Privacy by Default
Document date:	2019-03-07
Group:		Individual Submission
Pages:		31
URL:            https://www.ietf.org/internet-drafts/draft-birk-pep-03.txt
Status:         https://datatracker.ietf.org/doc/draft-birk-pep/
Htmlized:       https://tools.ietf.org/html/draft-birk-pep-03
Htmlized:       https://datatracker.ietf.org/doc/html/draft-birk-pep
Diff:           https://www.ietf.org/rfcdiff?url2=draft-birk-pep-03

Abstract:
    The pretty Easy privacy (pEp) protocols describe a set of conventions
    for the automation of operations traditionally seen as barriers to
    the use and deployment of secure end-to-end interpersonal messaging.
    These include, but are not limited to, key management, key discovery,
    and private key handling (including peer-to-peer synchronization of
    private keys and other user data across devices). pEp also introduces
    means to verify communication peers and proposes a trust-rating
    system to denote secure types of communications and signal the
    privacy level available on a per-user and per-message level.
    Significantly, the pEp protocols build on already available security
    formats and message transports (e.g., PGP/MIME), and are written with
    the intent to be interoperable with already widely-deployed systems
    in order to facilitate and ease adoption and implementation.  This
    document outlines the general design choices and principles of pEp.




Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/lTg5ws_UgvPKch39USQ-AUM4xSo>
Subject: Re: [Secdispatch] MTU Size
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Hi Mališa,

On Wed, Mar 06, 2019 at 04:00:17PM +0100, Mališa Vučinić wrote:
> Hello Hannes,
> 
> Thanks for bringing this up. I have to say that until the meeting yesterday
> I wasn't aware that "*rap" or "*rappy networks" was an appropriate language
> for an interim meeting to describe IoT technologies but maybe it's my short
> experience in the IETF that is to blame.

I confess I did not notice comments about "crap networks" during the
interim (well, maybe to describe Richard's hotel wifi), and I like to think
that I would have pushed back on it at the time had I noticed.  (That is, I
don't think it's appropriate language for an IETF meeting.)

> Regarding the overhead, I have put together a google doc summarizing the
> overhead in 6TiSCH during the network access authentication and key
> exchange. We do need to make a number of assumptions to get to a "concrete"
> number that you are requesting, for example how efficiently can we compress
> EUI-64s or how many hops are there in the network. I have documented some
> reasonable values in the document. Please let me know if you need more
> details on this.
> 
> https://docs.google.com/document/d/1wLoIexMLG3U9iYO5hzGzKjkvi-VDndQBbYRNsMUlh-k

Thanks for putting this together; it's good to have these numbers all in
one place.  It might be nice for the IETF archives if a version was
extracted from the gdoc and inlined into a message to the list at some
point, though of course you don't need to do that yourself.

-Ben


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Date: Sat, 9 Mar 2019 02:42:04 -0800
From: "RFC ISE (Adrian Farrel)" <rfc-ise@rfc-editor.org>
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Subject: [Secdispatch] A protocol for anonymity
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Hi,

Martin Gwerder has presented his draft to me for publication on the
Independent Stream.

https://datatracker.ietf.org/doc/draft-gwerder-messagevortexmain/

The document describes and specifies a protocol designed to achieve
anonymity by embedding messages within existing transfer protocols such as
SMTP or XMPP.

Martin tells me that he has made some overtures to the IETF, but has been
unable to find an opening to discuss his work. I think that may be because
it can sometimes be quite hard for a newcomer to work out how to find a
way in, especially for a topic that is not easily aligned with what we're
currently working on.

So, before I take this under my wing, I wondered whether you see a place
where you think this should be discussed within the IETF.

Thanks for any clues,
Adrian
-- 
Adrian Farrel (ISE),
rfc-ise@rfc-editor.org


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Subject: Re: [Secdispatch] [dispatch] A protocol for anonymity
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Hello Martin

Thanks for this contribution: that sounds very interesting -- we already
had such ideas already in within pretty Easy privacy (pEp); by instance,
for PGP/MIME with the SMTP transport, which is one of the reasons why we
do header protection by encapsulation (cf.
https://tools.ietf.org/html/draft-luck-lamps-pep-header-protection-00) ;
not sure yet if your approach works on the same application level, but
discussions on such approaches should go forward.

=46rom pEp side we would also be interested to contribute to actual
implementations in such directions.

Is there already any practical work? Cannot grasp that from the draft. :)=


Greets

Hernani

PS:
I also added the MEDUP list CC, which exists to discuss concrete drafts
(ideally with Running Code) to achieve decentralized privacy forms:

https://www.ietf.org/mailman/listinfo/MEDUP

On 09.03.19 11:42, RFC ISE (Adrian Farrel) wrote:

> Hi,
>=20
> Martin Gwerder has presented his draft to me for publication on the
> Independent Stream.
>=20
> https://datatracker.ietf.org/doc/draft-gwerder-messagevortexmain/
>=20
> The document describes and specifies a protocol designed to achieve
> anonymity by embedding messages within existing transfer protocols such=
 as
> SMTP or XMPP.
>=20
> Martin tells me that he has made some overtures to the IETF, but has be=
en
> unable to find an opening to discuss his work. I think that may be beca=
use
> it can sometimes be quite hard for a newcomer to work out how to find a=

> way in, especially for a topic that is not easily aligned with what we'=
re
> currently working on.
>=20
> So, before I take this under my wing, I wondered whether you see a plac=
e
> where you think this should be discussed within the IETF.
>=20
> Thanks for any clues,
> Adrian
>=20


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Subject: Re: [Secdispatch] A protocol for anonymity
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [Secdispatch] A protocol for anonymity
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On 09/03/2019 10:42, RFC ISE (Adrian Farrel) wrote:
> Hi,
>=20
> Martin Gwerder has presented his draft to me for publication on the
> Independent Stream.

Seems like something that ought be relevant for the pearg. [1]

S.

[1] https://irtf.org/pearg

>=20
> https://datatracker.ietf.org/doc/draft-gwerder-messagevortexmain/
>=20
> The document describes and specifies a protocol designed to achieve
> anonymity by embedding messages within existing transfer protocols such=
 as
> SMTP or XMPP.
>=20
> Martin tells me that he has made some overtures to the IETF, but has be=
en
> unable to find an opening to discuss his work. I think that may be beca=
use
> it can sometimes be quite hard for a newcomer to work out how to find a=

> way in, especially for a topic that is not easily aligned with what we'=
re
> currently working on.
>=20
> So, before I take this under my wing, I wondered whether you see a plac=
e
> where you think this should be discussed within the IETF.
>=20
> Thanks for any clues,
> Adrian
>=20

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-----END PGP PUBLIC KEY BLOCK-----

--------------097E96B077561FBCC54895E5--

--BgyVqaU5yxM5JuojLgpIzAfUrCgzpaNhV--

--jCXuSoD378n6OHYJ3P8mnMOr8CupAkccs
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----

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From: "Salz, Rich" <rsalz@akamai.com>
To: "rfc-ise@rfc-editor.org" <rfc-ise@rfc-editor.org>, "secdispatch@ietf.org" <secdispatch@ietf.org>, "dispatch@ietf.org" <dispatch@ietf.org>
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Thread-Topic: [Secdispatch] A protocol for anonymity
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From nobody Sun Mar 10 22:31:22 2019
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From: Martin <martin@gwerder.net>
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Subject: Re: [Secdispatch] A protocol for anonymity
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Hi Rich

Thanks for your concern. I understand where it is coming from. The
reason why Security Considerations are so small is that there is another
(academia) document dealing mainly with the security of the protocol.
Although the thesis has not been published (still needs lecturing, a
couple of attentive eyes questioning everything, and extension of some
sections), it is linked in the document, and you may read it. I felt
that including this into the RFC is too much by far. I, therefore,
referenced it in the first paragraph. Do you think that this was the
wrong decision?

You made definitely a valid point: Why believe a single person (in terms
of an administrator of a system or writer of a paper)? My reply is: You
should not. Read it and build your own opinion. There are a lot of minor
flaws in the protocol depending on how your adversary looks like. A lot
of "do's" and "donts's." If you are looking for the "why's" then reading
[MVAnalysis] is mandatory.

Another main problem is censorship resistance. The more you regulate the
behavior of the node, the easier it is to identify nodes (at least in
some points). I, therefore, tried to integrate all absolute mandatory
rules and to leave freedom to all other rules. I am sure willing to
change that decision if you think it should be entirely included in the
document instead of linking, but the document is already far from being
lightweight.

Regards
Martin


Am 11.03.2019 um 03:20 schrieb Salz, Rich:
>>    https://datatracker.ietf.org/doc/draft-gwerder-messagevortexmain/
>   
> I am VERY concerned about publishing something that claims to be a protocol for anonymity that has no security analysis and seems to be the work of one person.
>


From nobody Mon Mar 11 07:31:54 2019
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From: "Salz, Rich" <rsalz@akamai.com>
To: Martin <martin@gwerder.net>, "rfc-ise@rfc-editor.org" <rfc-ise@rfc-editor.org>, "secdispatch@ietf.org" <secdispatch@ietf.org>, "dispatch@ietf.org" <dispatch@ietf.org>
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From: Anders Rundgren <anders.rundgren.net@gmail.com>
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Subject: [Secdispatch] Signed HTTP Requests @ IETF-104
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I will be at the IETF-104 Saturday evening - Thursday 13.00 in case you are interested in this topic.

https://tools.ietf.org/html/draft-rundgren-signed-http-requests-00

4 minute "lightning" talk: https://cyberphone.github.io/ietf-signed-http-requests/hotrfc-shreq.pdf

On-line "laboratory":
https://mobilepki.org/shreq/home

We didn't got the related JSON Canonicalization BoF request accepted.  Maybe SECDISPATCH is a workable way forward?

thanx,
Anders


From nobody Mon Mar 11 11:24:14 2019
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdispatch/K0xTR5Ygj2Rbdsfkcfi4vLKyRkI>
Subject: [Secdispatch] my thoughts on the EDHOC interim
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Hi all,

Thanks to everyone who attended the interim -- I know it was not a great
time zone for many people, but you stuck to it.

My sense coming out of the session was that it's pretty clear there are
some wide areas of applicability where EDHOC is useful and a clear
improvement over the pure-PSK methods currently in use.  It seems like,
in broad terms, what we're currently stumbling over is just the process
of bringing new work to the IETF. Among other things, we evaluate proposed
work in a broad context that includes both the present state of deployment
(if any) in the problem space and the present state of similar protocols.

In particular, publishing as Proposed Standard in the IETF RFC stream
means (in general; there can be exceptions) that:

- the IETF has change control over the technology

- there is IETF consensus to produce a solution in the problem space in
  question and on what the problem space in question is

- there is IETF consensus that the technology in question is a good
  solution to the problem at hand.  It need not be the perfect solution
  if the value from publishing and implementing earlier outweights the
  costs of the delay to tweak it further; similarly, if an existing
  technology can be used to meet the need then there is a higher bar for
  introducing something completely new, depending on the degree of
  similarity and the nature of the protocol in question.

I am seeing several people try to assess the "good solution to the
problem at hand" portion and run into trouble because the "problem at
hand" was not clear enough (to them) to produce a clear answer -- we had
several alternate solutions proposed but no consensus on whether they
actually solve the problem at hand, largely because the "problem at hand"
has been hard to nail down in a way that can readily be assessed.  As such,
it may even be premature to try to tackle the "good solution to the problm
at hand" with the current definition, which is in some ways being described
as a pure minimization function with no cutoff for "good enough" or
"diminishing returns".  (From a mathematical sense, it's pretty clear that
the function thusly described has no absolute minimum, so our search would
never terminate.)

Luckily, it seems that our discussion of frame sizes and power
consumption can point us to a clear framing of *a* problem that does
have clear and actionable success criteria.  This need not be a "fully
general" space (if such a thing is even possible for constrained
devices), but if the relevant deployed base is large, even a solution
targeted to that space would have value.  (Presumably the solution would
still be useful in adjacent problem spaces as well, even if they were
not explictily targetted.)

As Martin noted, the standard questions we look at in BoF sessions can
also be used to assess proposed new work outside of a BoF, and it may be
useful to consider this work in the context of those questions:

1. What is the problem we are faced with?                                           
2. Is the problem understood and narrowly scoped?                                   
3. Do we believe it is possible to engineer a solution?                             
4. (stretch objective) Is this particular proposal a good basis for working on?     

Thanks to everyone for continuing to work through this topic in a
thoughtful and methodical manner.

-Ben


From nobody Mon Mar 11 11:34:55 2019
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From: Mohit Sethi M <mohit.m.sethi@ericsson.com>
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From nobody Mon Mar 11 23:19:06 2019
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From: Martin <martin@gwerder.net>
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Subject: Re: [Secdispatch] A protocol for anonymity
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Hi Rich

This is a valid point. Requested status is experimental. This allows
going for a standard later. So the primary goal is to become a standard
on the long term and to expose the protocol to a broader public. In my
eyes, for the standard, it would require that we have two seconding
documents — one dealing with best current practices and one focusing
security considerations (maybe both in one document). The main problem
with those two documents is not the protocol itself. As SMTP or HTTP in
its pure form, this is a transport protocol only. It does not deal with
the client side or the content itself.

Anonymity is broken easily by the users themselves. As an example, you
may take the fact that almost no user is ready to write emails in plain
text. They want to embed graphics and emoticons. Allowing HTML encoding
on the other side makes the protocol vulnerable to bugging attacks. At
the moment I am using Thunderbird as the client and the MessageVortex
node as "local mail server." While this makes sense from the user
perspective (no new client), it is maybe not the wisest decision from an
anonymity perspective. This, however, is not a problem of the protocol.
MessageVortex allows transferring any message and is not limited to
emails. These possibilities should be further explored.

At least for my person, this protocol opens a whole new world full of
possibilities. So I am very keen to see what it can do.

Regards
Martin


Am 11.03.2019 um 15:31 schrieb Salz, Rich:
> I would turn this around: why does this have to be an RFC?
>


From nobody Mon Mar 11 23:41:29 2019
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From: Barry Leiba <barryleiba@computer.org>
Date: Tue, 12 Mar 2019 15:41:13 +0900
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I would feel better about this if it were done as an Experimental RFC
in the IETF stream, ideally through an ART/SEC working group, as it's
too much to be AD-sponsored.  As such, it should go through
secdispatch or dispatch, and it's a bit late to do that for Prague.

I'd be hesitant to actually *block* it from the Independent stream
(more specifically, asking the ISE not to publish it because it needs
IETF review), but I'd rather see it in the IETF stream.  I also don't
know the history here, as I'm just stepping in as AD now, so perhaps
the issue of doing it in the IETF stream has already been hashed out.
If so, please clue me in.

Barry

On Tue, Mar 12, 2019 at 3:19 PM Martin <martin@gwerder.net> wrote:
>
> Hi Rich
>
> This is a valid point. Requested status is experimental. This allows
> going for a standard later. So the primary goal is to become a standard
> on the long term and to expose the protocol to a broader public. In my
> eyes, for the standard, it would require that we have two seconding
> documents =E2=80=94 one dealing with best current practices and one focus=
ing
> security considerations (maybe both in one document). The main problem
> with those two documents is not the protocol itself. As SMTP or HTTP in
> its pure form, this is a transport protocol only. It does not deal with
> the client side or the content itself.
>
> Anonymity is broken easily by the users themselves. As an example, you
> may take the fact that almost no user is ready to write emails in plain
> text. They want to embed graphics and emoticons. Allowing HTML encoding
> on the other side makes the protocol vulnerable to bugging attacks. At
> the moment I am using Thunderbird as the client and the MessageVortex
> node as "local mail server." While this makes sense from the user
> perspective (no new client), it is maybe not the wisest decision from an
> anonymity perspective. This, however, is not a problem of the protocol.
> MessageVortex allows transferring any message and is not limited to
> emails. These possibilities should be further explored.
>
> At least for my person, this protocol opens a whole new world full of
> possibilities. So I am very keen to see what it can do.
>
> Regards
> Martin
>
>
> Am 11.03.2019 um 15:31 schrieb Salz, Rich:
> > I would turn this around: why does this have to be an RFC?
> >


From nobody Tue Mar 12 03:43:05 2019
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Date: Tue, 12 Mar 2019 03:42:49 -0700
From: "RFC ISE (Adrian Farrel)" <rfc-ise@rfc-editor.org>
To: "Barry Leiba" <barryleiba@computer.org>
Cc: "Martin" <martin@gwerder.net>, "Salz, Rich" <rsalz@akamai.com>, "rfc-ise@rfc-editor.org" <rfc-ise@rfc-editor.org>, "secdispatch@ietf.org" <secdispatch@ietf.org>, "dispatch@ietf.org" <dispatch@ietf.org>, "sec-ads@ietf.org" <sec-ads@ietf.org>, "art-ads@ietf.org" <art-ads@ietf.org>, "draft-gwerder-messagevortexmain@ietf.org" <draft-gwerder-messagevortexmain@ietf.org>
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Subject: Re: [Secdispatch] A protocol for anonymity
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Thanks Barry,

Useful comments.

To be clear on the ISE position, here...

If there is a home for this work in the IETF (or possibly the IRTF), I
would be delighted to see the work moved there, discussed, updated, and
published with IETF consensus. That is, in fact, the purpose of this
thread.

Although it may be late for a presentation in Prague, I believe that the
corridors in the Hilton will be fully functional, and that the mailing
lists run 24x7 so we should at least be able to get an idea of whether
there is support to look at this in the IETF. (I am getting a strong hint
that that is the case, but as yet no firm commitment from a WG chair that
their mailing list is the place to focus the conversation.)

Thanks,
Adrian

Barry Leiba wrote:
> I would feel better about this if it were done as an Experimental RFC
> in the IETF stream, ideally through an ART/SEC working group, as it's
> too much to be AD-sponsored.  As such, it should go through
> secdispatch or dispatch, and it's a bit late to do that for Prague.
>
> I'd be hesitant to actually *block* it from the Independent stream
> (more specifically, asking the ISE not to publish it because it needs
> IETF review), but I'd rather see it in the IETF stream.  I also don't
> know the history here, as I'm just stepping in as AD now, so perhaps
> the issue of doing it in the IETF stream has already been hashed out.
> If so, please clue me in.
>
> Barry
>
> On Tue, Mar 12, 2019 at 3:19 PM Martin <martin@gwerder.net> wrote:
>>
>> Hi Rich
>>
>> This is a valid point. Requested status is experimental. This allows
>> going for a standard later. So the primary goal is to become a standard
>> on the long term and to expose the protocol to a broader public. In my
>> eyes, for the standard, it would require that we have two seconding
>> documents — one dealing with best current practices and one focusing
>> security considerations (maybe both in one document). The main problem
>> with those two documents is not the protocol itself. As SMTP or HTTP in
>> its pure form, this is a transport protocol only. It does not deal with
>> the client side or the content itself.
>>
>> Anonymity is broken easily by the users themselves. As an example, you
>> may take the fact that almost no user is ready to write emails in plain
>> text. They want to embed graphics and emoticons. Allowing HTML encoding
>> on the other side makes the protocol vulnerable to bugging attacks. At
>> the moment I am using Thunderbird as the client and the MessageVortex
>> node as "local mail server." While this makes sense from the user
>> perspective (no new client), it is maybe not the wisest decision from an
>> anonymity perspective. This, however, is not a problem of the protocol.
>> MessageVortex allows transferring any message and is not limited to
>> emails. These possibilities should be further explored.
>>
>> At least for my person, this protocol opens a whole new world full of
>> possibilities. So I am very keen to see what it can do.
>>
>> Regards
>> Martin
>>
>>
>> Am 11.03.2019 um 15:31 schrieb Salz, Rich:
>> > I would turn this around: why does this have to be an RFC?
>> >
>
>


-- 
Adrian Farrel (ISE),
rfc-ise@rfc-editor.org


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From: "Owen Friel (ofriel)" <ofriel@cisco.com>
To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, "atlas@ietf.org" <atlas@ietf.org>
CC: "secdispatch@ietf.org" <secdispatch@ietf.org>, "ace@ietf.org" <ace@ietf.org>
Thread-Topic: draft-friel-tls-atls-02
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cc: secdispatch and ace as this is related to the ongoing cTLS and EDHOC di=
scussions.

From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
Sent: 12 March 2019 11:22
To: atlas@ietf.org
Cc: Owen Friel (ofriel) <ofriel@cisco.com>
Subject: draft-friel-tls-atls-02

Hi all,

We submitted an update of the ATLS draft, which now contains text about con=
veying the TLS handshake over CoAP. This part was missing in -01.
This new version also supports establishment of OSCORE security contexts ba=
sed on the TLS/DTLS handshake. While this is still a bit experimental it wa=
s something that was suggested to use in the IETF.

We are looking forward to see how this document plays out in context of htt=
ps://tools.ietf.org/html/draft-schaad-ace-tls-cbor-handshake-00 and https:/=
/tools.ietf.org/html/draft-rescorla-tls-ctls-01.
Unlike regular TLS usage where there are limits to what can be done to the =
TLS record layer and the TLS handshake thanks to existing middleboxes the u=
se of ATLS makes these optimizations possible.

Ciao
Hannes

IMPORTANT NOTICE: The contents of this email and any attachments are confid=
ential and may also be privileged. If you are not the intended recipient, p=
lease notify the sender immediately and do not disclose the contents to any=
 other person, use it for any purpose, or store or copy the information in =
any medium. Thank you.

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">cc: secdi=
spatch and ace as this is related to the ongoing cTLS and EDHOC discussions=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span lang=3D"EN-US"=
>From:</span></b><span lang=3D"EN-US"> Hannes Tschofenig &lt;Hannes.Tschofe=
nig@arm.com&gt;
<br>
<b>Sent:</b> 12 March 2019 11:22<br>
<b>To:</b> atlas@ietf.org<br>
<b>Cc:</b> Owen Friel (ofriel) &lt;ofriel@cisco.com&gt;<br>
<b>Subject:</b> draft-friel-tls-atls-02<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">Hi=
 all,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">We=
 submitted an update of the ATLS draft, which now contains text about conve=
ying the TLS handshake over CoAP. This part was missing in -01.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">Th=
is new version also supports establishment of OSCORE security contexts base=
d on the TLS/DTLS handshake. While this is still a bit experimental it was =
something that was suggested to use in
 the IETF. <o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">We=
 are looking forward to see how this document plays out in context of
<a href=3D"https://tools.ietf.org/html/draft-schaad-ace-tls-cbor-handshake-=
00">https://tools.ietf.org/html/draft-schaad-ace-tls-cbor-handshake-00</a> =
and
<a href=3D"https://tools.ietf.org/html/draft-rescorla-tls-ctls-01">https://=
tools.ietf.org/html/draft-rescorla-tls-ctls-01</a>.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">Un=
like regular TLS usage where there are limits to what can be done to the TL=
S record layer and the TLS handshake thanks to existing middleboxes the use=
 of ATLS makes these optimizations possible.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">Ci=
ao<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">Ha=
nnes<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">IMPORTANT NOTICE: The c=
ontents of this email and any attachments are confidential and may also be =
privileged. If you are not the intended recipient, please notify the sender=
 immediately and do not disclose the
 contents to any other person, use it for any purpose, or store or copy the=
 information in any medium. Thank you.
<o:p></o:p></p>
</div>
</body>
</html>

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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 12 Mar 2019 11:10:20 -0700
Message-ID: <CABcZeBMgnOd2Kw0nh9tOTBjcUpADjwgtvzqSna6_K5SqzzmFDQ@mail.gmail.com>
To: Fernando Gont <fgont@si6networks.com>, IETF SecDispatch <secdispatch@ietf.org>
Cc: Benjamin Kaduk <kaduk@mit.edu>
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Subject: Re: [Secdispatch] Addition to saag agenda? (predictable numeric ids)
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+SECDISPATCH chairs.

This seems like it's more appropriate for SECDISPATCH.

-Ekr


On Tue, Mar 12, 2019 at 11:08 AM Fernando Gont <fgont@si6networks.com>
wrote:

> Folks,
>
> How about this one?
>
> * Title: "Security and Privacy Implications of Numeric Identifiers
> Employed in Network Protocols"
>
> * Filename: draft-gont-predictable-numeric-ids
>
> * Presenter: Fernando Gont <fgont@si6networks.com>
>
>
> * Background/previous discussion:
>
> This I-D was originally discussed on the SAAG list, and presented at the
> SAAG meeting in Buenos Aires
> (<https://www.ietf.org/proceedings/95/minutes/minutes-95-saag>). It
> seemed that folks agreed that the I-D had valuable information. There
> also seemed to be agreement to split the document in smaller bits,
> roughly as follows:
>
>    + Sample timeline of flawed IDs
>
> https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-history-03.txt
>
>    + Advice on numeric ID generation
>
>
> https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-generation-02.txt
>
>    + Update to RFC3552
>
>
> https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-sec-considerations-02.txt
>
>
> At the time, the update to RFC3552 was put on hold because of the
> rfc3552bis effort which was later aborted
> (<https://mailarchive.ietf.org/arch/msg/saag/4vf5RtHjliFs7dgsG8MKmhmgOi8
> >).
>
> The rfc3522bis died, but but this doc was stalled. Meanwhile, protocol
> implementations employing predictable IDs kept popping up.
>
> I wonder if this is something that saag would like to see move forward?
>
> Thanks!
>
> Cheers,
> --
> Fernando Gont
> SI6 Networks
> e-mail: fgont@si6networks.com
> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>
>
>
>
>

--0000000000007e3a1b0583e99c61
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>+SECDISPATCH chairs.</div><div><br></div><div>This se=
ems like it&#39;s more appropriate for SECDISPATCH.<br></div><div><br></div=
><div>-Ekr</div><div><br></div></div><br><div class=3D"gmail_quote"><div di=
r=3D"ltr" class=3D"gmail_attr">On Tue, Mar 12, 2019 at 11:08 AM Fernando Go=
nt &lt;<a href=3D"mailto:fgont@si6networks.com">fgont@si6networks.com</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Folks,=
<br>
<br>
How about this one?<br>
<br>
* Title: &quot;Security and Privacy Implications of Numeric Identifiers<br>
Employed in Network Protocols&quot;<br>
<br>
* Filename: draft-gont-predictable-numeric-ids<br>
<br>
* Presenter: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com" tar=
get=3D"_blank">fgont@si6networks.com</a>&gt;<br>
<br>
<br>
* Background/previous discussion:<br>
<br>
This I-D was originally discussed on the SAAG list, and presented at the<br=
>
SAAG meeting in Buenos Aires<br>
(&lt;<a href=3D"https://www.ietf.org/proceedings/95/minutes/minutes-95-saag=
" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/proceedings/95/=
minutes/minutes-95-saag</a>&gt;). It<br>
seemed that folks agreed that the I-D had valuable information. There<br>
also seemed to be agreement to split the document in smaller bits,<br>
roughly as follows:<br>
<br>
=C2=A0 =C2=A0+ Sample timeline of flawed IDs<br>
<br>
<a href=3D"https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-hist=
ory-03.txt" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/inter=
net-drafts/draft-gont-numeric-ids-history-03.txt</a><br>
<br>
=C2=A0 =C2=A0+ Advice on numeric ID generation<br>
<br>
<a href=3D"https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-gene=
ration-02.txt" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/in=
ternet-drafts/draft-gont-numeric-ids-generation-02.txt</a><br>
<br>
=C2=A0 =C2=A0+ Update to RFC3552<br>
<br>
<a href=3D"https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-sec-=
considerations-02.txt" rel=3D"noreferrer" target=3D"_blank">https://www.iet=
f.org/internet-drafts/draft-gont-numeric-ids-sec-considerations-02.txt</a><=
br>
<br>
<br>
At the time, the update to RFC3552 was put on hold because of the<br>
rfc3552bis effort which was later aborted<br>
(&lt;<a href=3D"https://mailarchive.ietf.org/arch/msg/saag/4vf5RtHjliFs7dgs=
G8MKmhmgOi8" rel=3D"noreferrer" target=3D"_blank">https://mailarchive.ietf.=
org/arch/msg/saag/4vf5RtHjliFs7dgsG8MKmhmgOi8</a>&gt;).<br>
<br>
The rfc3522bis died, but but this doc was stalled. Meanwhile, protocol<br>
implementations employing predictable IDs kept popping up.<br>
<br>
I wonder if this is something that saag would like to see move forward?<br>
<br>
Thanks!<br>
<br>
Cheers,<br>
-- <br>
Fernando Gont<br>
SI6 Networks<br>
e-mail: <a href=3D"mailto:fgont@si6networks.com" target=3D"_blank">fgont@si=
6networks.com</a><br>
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492<br>
<br>
<br>
<br>
<br>
</blockquote></div>

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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 12 Mar 2019 11:16:15 -0700
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Subject: Re: [Secdispatch] Addition to saag agenda? (predictable numeric ids)
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Oops, not to the chairs, I guess. Sorry about that.

On Tue, Mar 12, 2019 at 11:10 AM Eric Rescorla <ekr@rtfm.com> wrote:

> +SECDISPATCH chairs.
>
> This seems like it's more appropriate for SECDISPATCH.
>
> -Ekr
>
>
> On Tue, Mar 12, 2019 at 11:08 AM Fernando Gont <fgont@si6networks.com>
> wrote:
>
>> Folks,
>>
>> How about this one?
>>
>> * Title: "Security and Privacy Implications of Numeric Identifiers
>> Employed in Network Protocols"
>>
>> * Filename: draft-gont-predictable-numeric-ids
>>
>> * Presenter: Fernando Gont <fgont@si6networks.com>
>>
>>
>> * Background/previous discussion:
>>
>> This I-D was originally discussed on the SAAG list, and presented at the
>> SAAG meeting in Buenos Aires
>> (<https://www.ietf.org/proceedings/95/minutes/minutes-95-saag>). It
>> seemed that folks agreed that the I-D had valuable information. There
>> also seemed to be agreement to split the document in smaller bits,
>> roughly as follows:
>>
>>    + Sample timeline of flawed IDs
>>
>> https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-history-03.txt
>>
>>    + Advice on numeric ID generation
>>
>>
>> https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-generation-02.txt
>>
>>    + Update to RFC3552
>>
>>
>> https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-sec-considerations-02.txt
>>
>>
>> At the time, the update to RFC3552 was put on hold because of the
>> rfc3552bis effort which was later aborted
>> (<https://mailarchive.ietf.org/arch/msg/saag/4vf5RtHjliFs7dgsG8MKmhmgOi8
>> >).
>>
>> The rfc3522bis died, but but this doc was stalled. Meanwhile, protocol
>> implementations employing predictable IDs kept popping up.
>>
>> I wonder if this is something that saag would like to see move forward?
>>
>> Thanks!
>>
>> Cheers,
>> --
>> Fernando Gont
>> SI6 Networks
>> e-mail: fgont@si6networks.com
>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>>
>>
>>
>>
>>

--0000000000009f02840583e9b143
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Oops, not to the chairs, I guess. Sorry about that.<br></d=
iv><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On =
Tue, Mar 12, 2019 at 11:10 AM Eric Rescorla &lt;<a href=3D"mailto:ekr@rtfm.=
com">ekr@rtfm.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);p=
adding-left:1ex"><div dir=3D"ltr"><div>+SECDISPATCH chairs.</div><div><br><=
/div><div>This seems like it&#39;s more appropriate for SECDISPATCH.<br></d=
iv><div><br></div><div>-Ekr</div><div><br></div></div><br><div class=3D"gma=
il_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Mar 12, 2019 at 11:=
08 AM Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com" target=3D"=
_blank">fgont@si6networks.com</a>&gt; wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex">Folks,<br>
<br>
How about this one?<br>
<br>
* Title: &quot;Security and Privacy Implications of Numeric Identifiers<br>
Employed in Network Protocols&quot;<br>
<br>
* Filename: draft-gont-predictable-numeric-ids<br>
<br>
* Presenter: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com" tar=
get=3D"_blank">fgont@si6networks.com</a>&gt;<br>
<br>
<br>
* Background/previous discussion:<br>
<br>
This I-D was originally discussed on the SAAG list, and presented at the<br=
>
SAAG meeting in Buenos Aires<br>
(&lt;<a href=3D"https://www.ietf.org/proceedings/95/minutes/minutes-95-saag=
" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/proceedings/95/=
minutes/minutes-95-saag</a>&gt;). It<br>
seemed that folks agreed that the I-D had valuable information. There<br>
also seemed to be agreement to split the document in smaller bits,<br>
roughly as follows:<br>
<br>
=C2=A0 =C2=A0+ Sample timeline of flawed IDs<br>
<br>
<a href=3D"https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-hist=
ory-03.txt" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/inter=
net-drafts/draft-gont-numeric-ids-history-03.txt</a><br>
<br>
=C2=A0 =C2=A0+ Advice on numeric ID generation<br>
<br>
<a href=3D"https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-gene=
ration-02.txt" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/in=
ternet-drafts/draft-gont-numeric-ids-generation-02.txt</a><br>
<br>
=C2=A0 =C2=A0+ Update to RFC3552<br>
<br>
<a href=3D"https://www.ietf.org/internet-drafts/draft-gont-numeric-ids-sec-=
considerations-02.txt" rel=3D"noreferrer" target=3D"_blank">https://www.iet=
f.org/internet-drafts/draft-gont-numeric-ids-sec-considerations-02.txt</a><=
br>
<br>
<br>
At the time, the update to RFC3552 was put on hold because of the<br>
rfc3552bis effort which was later aborted<br>
(&lt;<a href=3D"https://mailarchive.ietf.org/arch/msg/saag/4vf5RtHjliFs7dgs=
G8MKmhmgOi8" rel=3D"noreferrer" target=3D"_blank">https://mailarchive.ietf.=
org/arch/msg/saag/4vf5RtHjliFs7dgsG8MKmhmgOi8</a>&gt;).<br>
<br>
The rfc3522bis died, but but this doc was stalled. Meanwhile, protocol<br>
implementations employing predictable IDs kept popping up.<br>
<br>
I wonder if this is something that saag would like to see move forward?<br>
<br>
Thanks!<br>
<br>
Cheers,<br>
-- <br>
Fernando Gont<br>
SI6 Networks<br>
e-mail: <a href=3D"mailto:fgont@si6networks.com" target=3D"_blank">fgont@si=
6networks.com</a><br>
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492<br>
<br>
<br>
<br>
<br>
</blockquote></div>
</blockquote></div>

--0000000000009f02840583e9b143--


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Hi,

The WebAuthn spec recently attained Recommendation status [1][2], thus 
it is time to progress draft-hodges-webauthn-registries-02 [3].

The latter I-D simply defines two IANA registries for W3C Web 
Authentication attestation statement format identifiers and extension 
identifiers.

Kathleen had initially AD-sponsored draft-hodges-webauthn-registries -- 
we're asking secdispatch to have Ben continue this sponsorship.

We're happy to discuss during the SecDispatch session at IETF-104 Prague 
if y'all wish.

Thanks,

=JeffH, Mike Jones, Giri Mandyam


[1] 
<https://www.w3.org/blog/webauthn/2019/03/10/web-authentication-level-1-is-a-w3c-recommendation/>

[2] https://www.w3.org/TR/2019/REC-webauthn-1-20190304/

[3] Subject: New Version Notification for 
draft-hodges-webauthn-registries-02.txt
To: Michael B. Jones <mbj@microsoft.com>, Giridhar Mandyam 
<mandyam@qti.qualcomm.com>, Jeff Hodges <jdhodges@google.com>
From: <internet-drafts@ietf.org>
Date: Mon, Mar 11, 2019 at 7:44 PM

A new version of I-D, draft-hodges-webauthn-registries-02.txt
has been successfully submitted by Jeff Hodges and posted to the
IETF repository.

Name:           draft-hodges-webauthn-registries
Revision:       02
Title:          Registries for Web Authentication (WebAuthn)
Document date:  2019-03-11
Group:          Individual Submission
Pages:          7
URL: 
<https://www.ietf.org/internet-drafts/draft-hodges-webauthn-registries-02.txt>
Status: 
<https://datatracker.ietf.org/doc/draft-hodges-webauthn-registries/>
Htmlized: 
<https://tools.ietf.org/html/draft-hodges-webauthn-registries-02>
Htmlized: 
<https://datatracker.ietf.org/doc/html/draft-hodges-webauthn-registries>
Diff: 
<https://www.ietf.org/rfcdiff?url2=draft-hodges-webauthn-registries-02>

Abstract:
    This specification defines IANA registries for W3C Web Authentication
    attestation statement format identifiers and extension identifiers.


The IETF Secretariat


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From nobody Fri Mar 15 07:28:08 2019
Return-Path: <rstruik.ext@gmail.com>
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From: Rene Struik <rstruik.ext@gmail.com>
To: =?UTF-8?Q?G=c3=b6ran_Selander?= <goran.selander@ericsson.com>, John Mattsson <john.mattsson@ericsson.com>
Cc: "secdispatch@ietf.org" <secdispatch@ietf.org>, 'Benjamin Kaduk' <kaduk@mit.edu>, "ace@ietf.org" <ace@ietf.org>
References: <C79F1336-A297-4E64-AB32-2F5D474A200E@ericsson.com> <20181103145857.GG54966@kduck.kaduk.org> <7F78CC92-5C48-4BFC-8087-E25D4D95A74F@ericsson.com> <000001d481ae$57cd4530$0767cf90$@augustcellars.com> <B119A1D8-08B5-431E-BB16-35D84AA6F6CB@ericsson.com> <8155ccb8-6b44-cd49-caae-8915ef0cef7d@gmail.com> <89483a94-8c12-9fc7-a4ed-75fb250beb14@gmail.com> <985573C6-A4A6-4CDE-BDC6-6E53EE80C025@ericsson.com> <087b4e56-fed8-ea17-5d02-882ff34665ad@gmail.com>
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Subject: Re: [Secdispatch] [Ace] (details on use case scenario?) Re: [Lwip] EDHOC standardization
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Hi Goran:

As you recall, I suggested to look at some details of 6TiSCH enrollment 
(see my message of March 4, 2019 [1]). During the SecDispatch interim of 
March 5, 2019, this was provided as one use case scenario [2] and 
reiterated in your email of yesterday, March 14, 2019 [3]. Nevertheless, 
details on how this could be realized in practice are still missing.

I had another look at the 6TiSCH minimal security draft [1] (now in 2nd 
WGLC) and the "zero-touch" write-up [5] -- which you both referenced in 
your email [3] of yesterday.

To my understanding, the intention with 6TiSCH is to reuse the protocol 
flows of [4] to implement a public-key based enrollment scheme in the 
future. This seems to be what [5] aims for, if I try and read in between 
the [still unwritten] lines, and the impression I got from some people. 
 From looking at the protocol details, though, I do not understand how 
this can be done in practice. This begs the question what I am missing 
here.

Hence, my question of March 4th on details of use case scenarios still 
stands. In fact, I do not see how one could implement EDHOC on top of 
[4], even if one only uses symmetric-key only variant of EDHOC.

If you could shed some light on this, this would help. Or, should we 
simply abandon that use case as being unrealistic at this point?

Finally, your email [1] suggests "reports of massive breaches with PSK 
provisioning systems". If so, I would strongly suggest having another 
look at [4] and commenting on this.

Ref:
[1] Details on Use Case Scenarios, email RS of March 4, 2019. See 
https://mailarchive.ietf.org/arch/msg/ace/On0iIFAb_OWeBqLjlryi1rBHwhk
[2] Slides on EDHOC during SecDispatch meeting of March 5, 2019. See 
https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/materials/slides-interim-2019-secdispatch-01-sessa-edhoc.pdf
[3] Pitch for EDHOC, email Goran Selander of March 14, 2019. See 
https://mailarchive.ietf.org/arch/msg/secdispatch/vNR7nT20fsvYjYXhAPjOpLjZGCU
[4] draft-ietf-6tisch-minimal-security-09
[5] draft-ietf-6tisch-dtsecurity-zerotouch-join-03

On 3/5/2019 9:05 AM, Rene Struik wrote:
> Hi Goran:
>
> Brief feedback below:
>
>
> Something like this is briefly discussed under the benchmarking 
> subject on today’s agenda, but with PSK/RPK ECHDE instead of 
> certificates.
>
> This is an excellent use case where message sizes is expected to have 
> a large impact and simulations can be made, e.g. using 
> https://bitbucket.org/6tisch/simulator/
>
> RS>> My 10-hop enrollment use case was aimed to force consideration of 
> not just abstract "protocol flow arrows", but also effects on the 
> network and its actors. A simple byte-count is not enough...
> <<RS
>
>
> Some things cannot be compressed, like e.g. nonces, they can only be 
> omitted by removing them at design time. Compression algorithms in 
> themselves also add to the footprint. The approach of OSCORE and EDHOC 
> has been to elide redundant information and define a compact format 
> from the start. Do you think a lossless data compression performs better?
>
> The other question I have is whether it would be more important to 
> hide the identity of the joining node in a network enrollment scenario 
> than to hide the network manager's identity, or the other way around.
>
> There are different options to embed EDHOC in CoAP, the first request 
> could be message_1 and the last response just an empty payload. Or the 
> first request can be a trigger and message_1 carried in the first 
> response.
>
> RS>> If the first request is a trigger, one ends up with a four-pass 
> protocol and might as well use the one I that allows parallel key 
> computations and where all byte-counts could possibly fit within 
> frames (see my message on "protocol flows" of October 31, 2018 and 
> John Mattson's response hereto of Feb 19, 2019).
> <<RS
>
> On 3/5/2019 6:41 AM, Göran Selander wrote:
>>
>> Hi Rene,
>>
>> *From: *Rene Struik <rstruik.ext@gmail.com>
>> *Date: *Monday, 4 March 2019 at 22:57
>> *To: *John Mattsson <john.mattsson@ericsson.com>
>> *Cc: *"secdispatch@ietf.org" <secdispatch@ietf.org>, Göran Selander 
>> <goran.selander@ericsson.com>, 'Benjamin Kaduk' <kaduk@mit.edu>, 
>> "ace@ietf.org" <ace@ietf.org>
>> *Subject: *(details on use case scenario?) Re: [Lwip] [Ace] EDHOC 
>> standardization
>>
>> Hi John, Goran:
>>
>> It is not easy to follow the discussion on EDHOC (except for 
>> witnessing a byte-count slinging contest on the mailing list).
>>
>> I think it would be good to look at the big picture, i.e., which 
>> problem does one solve and/or does one solve the right problem.
>>
>> I would like to understand somewhat better how the scheme suggested 
>> in [1] could help in facilitating fast network enrollment and network 
>> formation.
>>
>> Could you describe how to use this in the following scenario:
>>
>> 1) Network with one central manager and N=1,000 nodes that wish to 
>> join the network roughly at the same time, where the network manager 
>> is, say, 10 hops away from the joining nodes;
>>
>> 2) Authenticated key agreement using cert-based key agreement;
>>
>> 3) Network uses time-synchronized scheduling (such as in 6tisch) - 
>> where local single-hop communication time latency is 10 seconds);
>>
>> 4) The network manager may have high-bandwidth with outside world, 
>> but joining node/network manager path uses relatively low-bandwidth 
>> pipe that may only be available intermittently, with preset schedule);
>>
>> 5) It is unknown beforehand which entry point the joining nodes will 
>> pick when trying to enroll to the network?
>>
>> Something like this is briefly discussed under the benchmarking 
>> subject on today’s agenda, but with PSK/RPK ECHDE instead of 
>> certificates.
>>
>> This is an excellent use case where message sizes is expected to have 
>> a large impact and simulations can be made, e.g. using 
>> https://bitbucket.org/6tisch/simulator/
>>
>> While the draft refers to lots of details from other protocols that 
>> are used under the hood, it would be good to abstract from this for 
>> now and describe basics first.
>>
>> We have considered this. Our conclusion at the time was the having a 
>> precise description of an abstract protocol, in addition to the 
>> concrete mapping to COSE would perhaps be more confusing, and instead 
>> we tried to introduce people to CBOR and COSE in Appendix A. 
>> Considering the positive outcome from the CFRG Crypto Panel, I assume 
>> the protocol is sufficient readable for review. Please let us know if 
>> you have further issues reading it.
>>
>> I tend to agree with others that lossless data compression could 
>> result in some savings, with some give and take re encoding rules 
>> (see also [2]). Even if one finds a magic compression bullet at zero 
>> incremental cost, though, the more important question is what problem 
>> one solves and/or whether one solves the right problem. {As an aside, 
>> 802.15.4 (which is the MAC with the 127-byte payload limit mentioned) 
>> does not easily allow mixed secured/unsecured communications (but I 
>> do not think it is useful to have a side-discussion on that detail 
>> right now).}
>>
>> Some things cannot be compressed, like e.g. nonces, they can only be 
>> omitted by removing them at design time. Compression algorithms in 
>> themselves also add to the footprint. The approach of OSCORE and 
>> EDHOC has been to elide redundant information and define a compact 
>> format from the start. Do you think a lossless data compression 
>> performs better?
>>
>> The other question I have is whether it would be more important to 
>> hide the identity of the joining node in a network enrollment 
>> scenario than to hide the network manager's identity, or the other 
>> way around.
>>
>> There are different options to embed EDHOC in CoAP, the first request 
>> could be message_1 and the last response just an empty payload. Or 
>> the first request can be a trigger and message_1 carried in the first 
>> response.
>>
>> Hope that helps,
>>
>> Göran
>>
>> From [1], Section 1.1:
>>
>> EDHOC is optimized for small message sizes and can therefore be sent 
>> over a small number of radio frames. The message size of a key 
>> exchange protocol may have a large impact on the performance of an 
>> IoT deployment, especially in noisy environments. For example, in a 
>> network bootstrapping setting a large number of devices turned on in 
>> a short period of time may result in large latencies caused by 
>> parallel key exchanges.
>>
>> Ref: [1] draft-selander-ace-cose-ecdhe-12
>>
>>         [2] Email RS as of October 31, 2018, 2.32pm EDT, subject: 
>> https://mailarchive.ietf.org/arch/browse/ace/?q=struik
>>
>> On 11/22/2018 10:43 AM, Rene Struik wrote:
>>
>>     Hi John:
>>
>>     When comparing protocols, it would be useful to protocol flows
>>     optimization, as follows:
>>     a) optimized for parallelized online computations;
>>     b) optimized for minimization of message flows.
>>     See also slide 6 of my CFRG-83 presentation of March 30, 2012
>>     (slides-83-cfrg-05 attached; I could not find CFRG records online).
>>
>>     The current draft-selander-ace-cose-ecdhe-10 document considers
>>     optimization b), which minimizes the number of message flows, but
>>     does require each party to compute the shared key consecutively,
>>     rather than in parallel (as in optimization a).
>>
>>     With option a), if one really wishes to squeeze as much info into
>>     a 128-octet datagram, one can already send A's ephemeral ECDSA
>>     signature key in message flow 1, thereby cutting down the
>>     size of the second message flow of the Sigma protocol depicted in
>>     Fig. 1
>>     (https://tools.ietf.org/html/draft-selander-ace-cose-ecdhe-10#page-11)
>>     by 32 octets. This tackles the 120-octet byte count for the
>>     second flow of Fig. 1 quite simply, while leading to a 4-pass
>>     protocol flow (with roughly 70/70/55/55 bytes in flows 1/2/3/4).
>>
>>     Obviously, this presents a trade-off, but quite well be worth it
>>     in settings where online key computations are quite slow on some
>>     platforms and where scheduling (e.g., with TSCH) can now be done
>>     with less consideration of the individual computational
>>     capabilities of devices (since now one does not need to build-in
>>     a worst-case 2 x "key computation back-off" for least capable
>>     devices, but can just use the 1x contingency for this).
>>
>>     The parallel version is depicted below.
>>
>>     Party
>>
>>     U Party V | C_U, X_U, ALG_1, UAD_1, R_Sig(U;...) |
>>     +--------------------------------------------------------------------->|
>>     | message_1 | | | | C_U, C_V, X_V, ALG_2, R_Sig(V; ...) |
>>     |<---------------------------------------------------------------------+
>>     |
>>
>>     message_2 | | | | S_U, AEAD(K_3; ID_CRED_U, s_Sig(U; CRED_U,
>>     aad_3), PAD_3) |
>>     +--------------------------------------------------------------------->+
>>     | message_3 |
>>     |
>>
>>     | | S_V, AEAD(K_2;
>>
>>     ID_CRED_V, s_Sig(V; CRED_V, aad_2), UAD_2)| |
>>     +<---------------------------------------------------------------------|
>>     | message_4 |
>>
>>     ==============================================================================
>>
>>
>>     Flight                                #1         #2        #3    #4    Total
>>
>>     ------------------------------------------------------------------------------
>>
>>     DTLS 1.3 RPK + ECDHE                 143        364       212     -     721
>>
>>     TLS 1.3  RPK + ECDHE                 129        322       194     -     645
>>
>>     EDHOC    RPK + ECDHE                  37        120        85     -     242
>>
>>     --> EDHOC parallel flow                 70         70        55     55    250
>>
>>     On 11/22/2018 7:23 AM, John Mattsson wrote:
>>
>>         Hi Jim,
>>
>>             In the analysis that I did I very deliberately used TLS not DTLS.  The main reason for using DTLS is because one is operating in the UDP environment and one cannot have reliable in order delivery.  Since EDHOC is being built on top of CoAP, one can use CoAP to create reliable in order delivery.  Thus, the extra bytes that DTLS has to deal with this are not needed.
>>
>>         I started with DTLS as that was what was discussion between Salvador and Benjamin. Below are numbers for TLS 1.3. Changes compared to DTLS 1.3 are that the record header is smaller, handshake headers are smaller, and that Connection ID is not supported in TLS 1.3. The numbers I get for TLS 1.3 are overall slightly bigger than the numbers in your estimate (but for PSK Flight #3 I get slightly smaller numbers). I think the difference is due to many smaller things like handshake headers and fields in the certificate structure that adds up. I plan to add TLS 1.3 numbers to draft-ietf-lwig-security-protocol-comparison as well.
>>
>>         I agree with your comment Jim. Just now, I am just trying to count the number of bytes of the security protocol. To do a fair comparison, you have to choose a specific deployment and look at the topology, the whole protocol stack, frame sizes (e.g. 128 bytes), how and where in the protocol stack fragmentation is done, and the expected packet loss. There is ongoing work on such simulations for 6tisch. Fragmentation and/or packet loss lead to the total number of bytes in the table below has to be multiplied by some linear factor. And as more bytes often lead to increased packet loss, you often see a non-linear relation between logical number of bytes on the transport/application layer as shown in the table below and physical number of bytes and/or time from completion of the protocol. Any realistic comparison over constrained radio would make the difference between TLS 1.3 and EDHOC larger. A problem with TLS is that it does not support Connection ID.
>>
>>         TLS Assumptions:
>>
>>         - Minimum number of algorithms and cipher suites offered
>>
>>         - Curve25519, ECDSA with P-256, AES-CCM_8, SHA-256
>>
>>         - Length of key identifiers: 4 bytes
>>
>>         - TLS RPK with point compression (saves 32 bytes)
>>
>>         - Only mandatory TLS extentions
>>
>>         ==============================================================================
>>
>>         Flight                                #1         #2        #3       Total
>>
>>         ------------------------------------------------------------------------------
>>
>>         DTLS 1.3 RPK + ECDHE                 143        364       212        721
>>
>>         TLS 1.3  RPK + ECDHE                 129        322       194        645
>>
>>         EDHOC    RPK + ECDHE                  37        120        85        242
>>
>>         ------------------------------------------------------------------------------
>>
>>         DTLS 1.3 PSK + ECDHE                 180        183        56        419
>>
>>         TLS 1.3  PSK + ECDHE                 166        157        50        373
>>
>>         EDHOC    PSK + ECDHE                  42         46        11         99
>>
>>         ------------------------------------------------------------------------------
>>
>>         DTLS 1.3 PSK                         130        143        56        329
>>
>>         TLS 1.3  PSK                         116        117        50        283
>>
>>         ==============================================================================
>>
>>                                  Number of bytes (No connection ID)
>>
>>         Below is detailed information about the different flights:
>>
>>         ======================================================
>>
>>         TLS 1.3 Flight #1 RPK + ECDHE
>>
>>         ======================================================
>>
>>         Record Header - TLSPlaintext (5 bytes)
>>
>>         16 03 03 LL LL
>>
>>               Handshake Header - Client Hello (4 bytes)
>>
>>               01 LL LL LL
>>
>>                       Legacy Version (2 bytes)
>>
>>                       03 03
>>
>>                       Client Random (32 bytes)
>>
>>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                       Legacy Session ID (1 bytes)
>>
>>                       00
>>
>>                       Cipher Suites (TLS_AES_128_CCM_8_SHA256) (4 bytes)
>>
>>                       00 02 13 05
>>
>>                       Compression Methods (null) (2 bytes)
>>
>>                       01 00
>>
>>                       Extensions Length (2 bytes)
>>
>>                       LL LL
>>
>>                              Extension - Supported Groups (x25519) (8 bytes)
>>
>>                              00 0a 00 04 00 02 00 1d
>>
>>                              Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>>
>>                              00 0d 00 04 00 02 08 07
>>
>>                              Extension - Key Share (42 bytes)
>>
>>                              00 33 00 26 00 24 00 1d 00 20
>>
>>                              00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                              Extension - Supported Versions (1.3) (7 bytes)
>>
>>                              00 2b 00 03 02 03 04
>>
>>                              Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>
>>                              00 13 00 01 01 02
>>
>>                              Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>>                              00 14 00 01 01 02
>>
>>         5 + 4 + 2 + 32 + 1 + 4 + 2 + 2 + 8 + 8 + 42 + 7 + 6 + 6 = 129 bytes
>>
>>         ------------------------------------------------------
>>
>>         TLS 1.3 Flight #1 PSK + ECDHE
>>
>>         ------------------------------------------------------
>>
>>         Differences compared to RPK + ECDHE
>>
>>         + Extension - PSK Key Exchange Modes (6 bytes)
>>
>>            00 2d 00 02 01 01
>>
>>         + Extension - Pre Shared Key (51 bytes)
>>
>>            00 29 00 2F
>>
>>            00 0a 00 04 ID ID ID ID 00 00 00 00
>>
>>            00 21 20 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>         - Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>>
>>         - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>
>>         - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>>         129 + 6 + 51 - 8 - 6 - 6 = 166 bytes
>>
>>         ------------------------------------------------------
>>
>>         TLS 1.3 Flight #1 PSK
>>
>>         ------------------------------------------------------
>>
>>         Differences compared to PSK + ECDHE
>>
>>         - Extension - Supported Groups (x25519) (8 bytes)
>>
>>         - Extension - Key Share (42 bytes)
>>
>>         166 - 8 - 42 = 116 bytes
>>
>>         ======================================================
>>
>>         TLS 1.3 Flight #2  RPK + ECDHE
>>
>>         ======================================================
>>
>>         Record Header - TLSPlaintext (5 bytes)
>>
>>         16 03 03 LL LL
>>
>>               Handshake Header - Server Hello (4 bytes)
>>
>>               02 LL LL LL
>>
>>                       Legacy Version (2 bytes)
>>
>>                       fe fd
>>
>>                       Server Random (32 bytes)
>>
>>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                       Legacy Session ID (1 bytes)
>>
>>                       00
>>
>>                       Cipher Suite (TLS_AES_128_CCM_8_SHA256) (2 bytes)
>>
>>                       13 05
>>
>>                       Compression Method (null) (1 bytes)
>>
>>                       00
>>
>>                       Extensions Length (2 bytes)
>>
>>                       LL LL
>>
>>                              Extension - Key Share (40 bytes)
>>
>>                              00 33 00 24 00 1d 00 20
>>
>>                              00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                              Extension - Supported Versions (1.3) (6 bytes)
>>
>>                              00 2b 00 02 03 04
>>
>>         Record Header - TLSCiphertext (5 bytes)
>>
>>         17 03 03 LL LL
>>
>>               Handshake Header - Encrypted Extensions (4 bytes)
>>
>>               08 LL LL LL
>>
>>                       Extensions Length (2 bytes)
>>
>>                       LL LL
>>
>>                              Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>
>>                              00 13 00 01 01 02
>>
>>                              Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>>                              00 14 00 01 01 02
>>
>>               Handshake Header - Certificate Request (4 bytes)
>>
>>               0d LL LL LL
>>
>>                       Request Context (1 bytes)
>>
>>                       00
>>
>>                       Extensions Length (2 bytes)
>>
>>                       LL LL
>>
>>                              Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>>
>>                              00 0d 00 04 00 02 08 07
>>
>>               Handshake Header - Certificate (4 bytes)
>>
>>               0b LL LL LL
>>
>>                       Request Context (1 bytes)
>>
>>                       00
>>
>>                       Certificate List Length (3 bytes)
>>
>>                       LL LL LL
>>
>>                       Certificate Length (3 bytes)
>>
>>                       LL LL LL
>>
>>                       Certificate (59 bytes) // Point compression
>>
>>                       ....
>>
>>                       Certificate Extensions (2 bytes)
>>
>>                       00 00
>>
>>               Handshake Header - Certificate Verify (4 bytes)
>>
>>               0f LL LL LL
>>
>>                       Signature  (68 bytes)
>>
>>                       ZZ ZZ 00 40 ....
>>
>>               Handshake Header - Finished (4 bytes)
>>
>>               14 LL LL LL
>>
>>                       Verify Data (32 bytes)
>>
>>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>               Record Type (1 byte)
>>
>>               16
>>
>>         Auth Tag (8 bytes)
>>
>>         e0 8b 0e 45 5a 35 0a e5
>>
>>         5 + 90 + 5 + 18 + 15 + 72 + 72 + 36 + 1 + 8 = 322 bytes
>>
>>         ------------------------------------------------------
>>
>>         TLS 1.3 Flight #2 PSK + ECDHE
>>
>>         ------------------------------------------------------
>>
>>         Differences compared to RPK + ECDHE
>>
>>         - Handshake Message Certificate (72 bytes)
>>
>>         - Handshake Message CertificateVerify (72 bytes)
>>
>>         - Handshake Message CertificateRequest (15 bytes)
>>
>>         - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>
>>         - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>>         + Extension - Pre Shared Key (6 bytes)
>>
>>            00 29 00 02 00 00
>>
>>         322 - 72 - 72 - 15 - 6 - 6  + 6 = 157 bytes
>>
>>         ------------------------------------------------------
>>
>>         TLS 1.3 Flight #2 PSK
>>
>>         ------------------------------------------------------
>>
>>         Differences compared to PSK + ECDHE
>>
>>         - Extension - Key Share (40 bytes)
>>
>>         157 - 40 = 117 bytes
>>
>>         ======================================================
>>
>>         TLS 1.3 Flight #3 RPK + ECDHE
>>
>>         ======================================================
>>
>>         Record Header - TLSCiphertext (5 bytes)
>>
>>         17 03 03 LL LL
>>
>>               Handshake Header - Certificate (4 bytes)
>>
>>               0b LL LL LL
>>
>>                       Request Context (1 bytes)
>>
>>                       00
>>
>>                       Certificate List Length (3 bytes)
>>
>>                       LL LL LL
>>
>>                       Certificate Length (3 bytes)
>>
>>                       LL LL LL
>>
>>               
>>
>>                       Certificate (59 bytes) // Point compression
>>
>>                       ....
>>
>>                       Certificate Extensions (2 bytes)
>>
>>                       00 00
>>
>>               Handshake Header - Certificate Verify (4 bytes)
>>
>>               0f LL LL LL
>>
>>                       Signature  (68 bytes)
>>
>>                       04 03 LL LL //ecdsa_secp256r1_sha256
>>
>>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>               Handshake Header - Finished (4 bytes)
>>
>>               14 LL LL LL
>>
>>                       Verify Data (32 bytes) // SHA-256
>>
>>                       00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>               Record Type (1 byte)
>>
>>               16
>>
>>         Auth Tag (8 bytes) // AES-CCM_8
>>
>>         00 01 02 03 04 05 06 07
>>
>>         5 + 72 + 72 + 36 + 1 + 8 = 194 bytes
>>
>>         ------------------------------------------------------
>>
>>         TLS 1.3 Flight #3 PSK + ECDHE
>>
>>         -----------------------------------------------------
>>
>>         Differences compared to RPK + ECDHE
>>
>>         - Handshake Message Certificate (72 bytes)
>>
>>         - Handshake Message Certificate Verify (72 bytes)
>>
>>         194 - 72 - 72 = 50 bytes
>>
>>         ------------------------------------------------------
>>
>>         TLS 1.3 Flight #3 PSK
>>
>>         -----------------------------------------------------
>>
>>         Differences compared to PSK + ECDHE
>>
>>         None
>>
>>         50 bytes
>>
>>         -----Original Message-----
>>
>>         From: Jim Schaad<ietf@augustcellars.com>  <mailto:ietf@augustcellars.com>
>>
>>         Date: Wednesday, 21 November 2018 at 16:25
>>
>>         To: John Mattsson<john.mattsson@ericsson.com>  <mailto:john.mattsson@ericsson.com>,"ace@ietf.org"  <mailto:ace@ietf.org>  <ace@ietf.org>  <mailto:ace@ietf.org>,"lwip@ietf.org"  <mailto:lwip@ietf.org>  <lwip@ietf.org>  <mailto:lwip@ietf.org>
>>
>>         Cc: 'Benjamin Kaduk'<kaduk@mit.edu>  <mailto:kaduk@mit.edu>,"salvador.p.f@um.es"  <mailto:salvador.p.f@um.es>  <salvador.p.f@um.es>  <mailto:salvador.p.f@um.es>
>>
>>         Subject: RE: [Ace] EDHOC standardization
>>
>>         John,
>>
>>         In the analysis that I did I very deliberately used TLS not DTLS.  The main reason for using DTLS is because one is operating in the UDP environment and one cannot have reliable in order delivery.  Since EDHOC is being built on top of CoAP, one can use CoAP to create reliable in order delivery.  Thus the extra bytes that DTLS has to deal with this are not needed.
>>
>>         Jim
>>
>>             -----Original Message-----
>>
>>             From: Ace<ace-bounces@ietf.org>  <mailto:ace-bounces@ietf.org>  On Behalf Of John Mattsson
>>
>>             Sent: Wednesday, November 21, 2018 7:03 AM
>>
>>             To:ace@ietf.org  <mailto:ace@ietf.org>;lwip@ietf.org  <mailto:lwip@ietf.org>
>>
>>             Cc: Benjamin Kaduk<kaduk@mit.edu>  <mailto:kaduk@mit.edu>;salvador.p.f@um.es  <mailto:salvador.p.f@um.es>
>>
>>             Subject: Re: [Ace] EDHOC standardization
>>
>>             Hi all,
>>
>>             Inspired by the discussion in this thread, I did more detailed calculations of the
>>
>>             number of bytes when DTLS 1.3 is used for typical IoT use cases (PSK, RPK,
>>
>>             Connection ID). The plan is to add this information to draft-ietf-lwig-security-
>>
>>             protocol-comparison as this has been requested by several people. I think some
>>
>>             bytes were missing in the earlier estimates for TLS 1.3, and as Ben commented,
>>
>>             DTLS 1.3 adds some bytes compared to TLS 1.3.
>>
>>             ================================================================
>>
>>             ==============
>>
>>             Flight                                #1         #2        #3       Total
>>
>>             ------------------------------------------------------------------------------
>>
>>             DTLS 1.3 RPK + ECDHE                 149        373       213        735
>>
>>             DTLS 1.3 PSK + ECDHE                 186        190        57        433
>>
>>             DTLS 1.3 PSK                         136        150        57        343
>>
>>             ------------------------------------------------------------------------------
>>
>>             EDHOC    RPK + ECDHE                  38        121        86        245
>>
>>             EDHOC    PSK + ECDHE                  43         47        12        102
>>
>>             ================================================================
>>
>>             ==============
>>
>>                                               Number of bytes
>>
>>             Assumptions:
>>
>>             - Minimum number of algorithms and cipher suites offered
>>
>>             - Curve25519, ECDSA with P-256, AES-CCM_8, SHA-256
>>
>>             - Length of key identifiers: 4 bytes
>>
>>             - Connection identifiers: 1 byte
>>
>>             - The DTLS RPKs use point compression (saves 32 bytes)
>>
>>             - No DTLS handshake message fragmentation
>>
>>             - Only mandatory DTLS extentions, except for connection ID
>>
>>             - Version 30https://tools.ietf.org/html/draft-ietf-tls-dtls13-30
>>
>>             (EDHOC numbers are for the soon to be published -11 version with cipher
>>
>>             suites)
>>
>>             I hope this information is useful for people. Please comment if I missed
>>
>>             something or if you have any suggestion of things to add or how to present
>>
>>             things. I do not know currently how these numbers compare to DTLS 1.2.
>>
>>             Below is detailed information about where the byte in different flights as well
>>
>>             as the RPKs (SubjectPublicKeyInfo). Most of the bytes should have the correct
>>
>>             value, but most of the length fields are just written as LL LL LL. Below is also
>>
>>             information about how resumption, cached information [RFC 7924], and not
>>
>>             using Connection ID affects the number of bytes.
>>
>>             ======================================================
>>
>>             DTLS 1.3 Flight #1 RPK + ECDHE
>>
>>             ======================================================
>>
>>             Record Header - DTLSPlaintext (13 bytes)
>>
>>             16 fe fd EE EE SS SS SS SS SS SS LL LL
>>
>>                     Handshake Header - Client Hello (10 bytes)
>>
>>                     01 LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Legacy Version (2 bytes)
>>
>>                            fe fd
>>
>>                            Client Random (32 bytes)
>>
>>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>
>>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                            Legacy Session ID (1 bytes)
>>
>>                      ��     00
>>
>>                            Cipher Suites (TLS_AES_128_CCM_8_SHA256) (4 bytes)
>>
>>                            00 02 13 05
>>
>>                            Compression Methods (null) (2 bytes)
>>
>>                            01 00
>>
>>                            Extensions Length (2 bytes)
>>
>>                            LL LL
>>
>>                                    Extension - Supported Groups (x25519) (8 bytes)
>>
>>                                    00 0a 00 04 00 02 00 1d
>>
>>                                    Extension - Signature Algorithms
>>
>>             (ecdsa_secp256r1_sha256) (8 bytes)
>>
>>                                    00 0d 00 04 00 02 08 07
>>
>>                                    Extension - Key Share (42 bytes)
>>
>>                                    00 33 00 26 00 24 00 1d 00 20
>>
>>                                    00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11
>>
>>             12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                                    Extension - Supported Versions (1.3) (7 bytes)
>>
>>                                    00 2b 00 03 02 03 04
>>
>>                                    Extension - Client Certificate Type (Raw Public Key) (6
>>
>>             bytes)
>>
>>                                    00 13 00 01 01 02
>>
>>                                    Extension - Server Certificate Type (Raw Public Key) (6
>>
>>             bytes)
>>
>>                                    00 14 00 01 01 02
>>
>>                                    Extension - Connection Identifier (43) (6 bytes)
>>
>>                                    XX XX 00 02 01 42
>>
>>             13 + 10 + 2 + 32 + 1 + 4 + 2 + 2 + 8 + 8 + 42 + 7 + 6 + 6 + 6 = 149 bytes
>>
>>             ------------------------------------------------------
>>
>>             DTLS 1.3 Flight #1 PSK + ECDHE
>>
>>             ------------------------------------------------------
>>
>>             Differences compared to RPK + ECDHE
>>
>>             + Extension - PSK Key Exchange Modes (6 bytes)
>>
>>                00 2d 00 02 01 01
>>
>>             + Extension - Pre Shared Key (51 bytes)
>>
>>                00 29 00 2F
>>
>>                00 0a 00 04 ID ID ID ID 00 00 00 00
>>
>>                00 21 20 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15
>>
>>             16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>             - Extension - Signature Algorithms (ecdsa_secp256r1_sha256) (8 bytes)
>>
>>             - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>
>>             - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>>             149 + 6 + 51 - 8 - 6 - 6 = 186 bytes
>>
>>             ------------------------------------------------------
>>
>>             DTLS 1.3 Flight #1 PSK
>>
>>             ------------------------------------------------------
>>
>>             Differences compared to PSK + ECDHE
>>
>>             - Extension - Supported Groups (x25519) (8 bytes)
>>
>>             - Extension - Key Share (42 bytes)
>>
>>             186 - 8 - 42 = 136 bytes
>>
>>             ======================================================
>>
>>             DTLS 1.3 Flight #2  RPK + ECDHE
>>
>>             ======================================================
>>
>>             Record Header - DTLSPlaintext (13 bytes)
>>
>>             16 fe fd EE EE SS SS SS SS SS SS LL LL
>>
>>                     Handshake Header - Server Hello (10 bytes)
>>
>>                     02 LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Legacy Version (2 bytes)
>>
>>                            fe fd
>>
>>                            Server Random (32 bytes)
>>
>>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>
>>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                            Legacy Session ID (1 bytes)
>>
>>                            00
>>
>>                            Cipher Suite (TLS_AES_128_CCM_8_SHA256) (2 bytes)
>>
>>                            13 05
>>
>>                            Compression Method (null) (1 bytes)
>>
>>                            00
>>
>>                            Extensions Length (2 bytes)
>>
>>                            LL LL
>>
>>                                    Extension - Key Share (40 bytes)
>>
>>                                    00 33 00 24 00 1d 00 20
>>
>>                                    00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11
>>
>>             12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                                    Extension - Supported Versions (1.3) (6 bytes)
>>
>>                                    00 2b 00 02 03 04
>>
>>                                    Extension - Connection Identifier (43) (6 bytes)
>>
>>                                    XX XX 00 02 01 43
>>
>>             Record Header - DTLSCiphertext, Full (6 bytes) HH ES SS 43 LL LL
>>
>>                     Handshake Header - Encrypted Extensions (10 bytes)
>>
>>                     08 LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Extensions Length (2 bytes)
>>
>>                            LL LL
>>
>>                                    Extension - Client Certificate Type (Raw Public Key) (6
>>
>>             bytes)
>>
>>                                    00 13 00 01 01 02
>>
>>                                    Extension - Server Certificate Type (Raw Public Key) (6
>>
>>             bytes)
>>
>>                                    00 14 00 01 01 02
>>
>>                     Handshake Header - Certificate Request (10 bytes)
>>
>>                     0d LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Request Context (1 bytes)
>>
>>                            00
>>
>>                            Extensions Length (2 bytes)
>>
>>                            LL LL
>>
>>                                    Extension - Signature Algorithms
>>
>>             (ecdsa_secp256r1_sha256) (8 bytes)
>>
>>                                    00 0d 00 04 00 02 08 07
>>
>>                     Handshake Header - Certificate (10 bytes)
>>
>>                     0b LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Request Context (1 bytes)
>>
>>                            00
>>
>>                            Certificate List Length (3 bytes)
>>
>>                            LL LL LL
>>
>>                            Certificate Length (3 bytes)
>>
>>                            LL LL LL
>>
>>                            Certificate (59 bytes) // Point compression
>>
>>                            ....
>>
>>                            Certificate Extensions (2 bytes)
>>
>>                            00 00
>>
>>                     Handshake Header - Certificate Verify (10 bytes)
>>
>>                     0f LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Signature  (68 bytes)
>>
>>                            ZZ ZZ 00 40 ....
>>
>>                     Handshake Header - Finished (10 bytes)
>>
>>                     14 LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Verify Data (32 bytes)
>>
>>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>
>>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                     Record Type (1 byte)
>>
>>                     16
>>
>>             Auth Tag (8 bytes)
>>
>>             e0 8b 0e 45 5a 35 0a e5
>>
>>             13 + 102 + 6 + 24 + 21 + 78 + 78 + 42 + 1 + 8 = 373 bytes
>>
>>             ------------------------------------------------------
>>
>>             DTLS 1.3 Flight #2 PSK + ECDHE
>>
>>             ------------------------------------------------------
>>
>>             Differences compared to RPK + ECDHE
>>
>>             - Handshake Message Certificate (78 bytes)
>>
>>             - Handshake Message CertificateVerify (78 bytes)
>>
>>             - Handshake Message CertificateRequest (21 bytes)
>>
>>             - Extension - Client Certificate Type (Raw Public Key) (6 bytes)
>>
>>             - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>>             + Extension - Pre Shared Key (6 bytes)
>>
>>                00 29 00 02 00 00
>>
>>             373 - 78 - 78 - 21 - 6 - 6  + 6 = 190 bytes
>>
>>             ------------------------------------------------------
>>
>>             DTLS 1.3 Flight #2 PSK
>>
>>             ------------------------------------------------------
>>
>>             Differences compared to PSK + ECDHE
>>
>>             - Extension - Key Share (40 bytes)
>>
>>             190 - 40 = 150 bytes
>>
>>             ======================================================
>>
>>             DTLS 1.3 Flight #3 RPK + ECDHE
>>
>>             ======================================================
>>
>>             Record Header (6 bytes) // DTLSCiphertext, Full ZZ ES SS 42 LL LL
>>
>>                     Handshake Header - Certificate (10 bytes)
>>
>>                     0b LL LL LL SS SS XX XX XX LL LL LL
>>
>>                            Request Context (1 bytes)
>>
>>                            00
>>
>>                            Certificate List Length (3 bytes)
>>
>>                            LL LL LL
>>
>>                            Certificate Length (3 bytes)
>>
>>                            LL LL LL
>>
>>                            Certificate (59 bytes) // Point compression
>>
>>                            ....
>>
>>                            Certificate Extensions (2 bytes)
>>
>>                            00 00
>>
>>                     Handshake Header - Certificate Verify (10 bytes)
>>
>>                     0f LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Signature  (68 bytes)
>>
>>                            04 03 LL LL //ecdsa_secp256r1_sha256
>>
>>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>
>>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>
>>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                     Handshake Header - Finished (10 bytes)
>>
>>                     14 LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Verify Data (32 bytes) // SHA-256
>>
>>                            00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14
>>
>>             15 16 17 18 19 1a 1b 1c 1d 1e 1f
>>
>>                     Record Type (1 byte)
>>
>>                     16
>>
>>             Auth Tag (8 bytes) // AES-CCM_8
>>
>>             00 01 02 03 04 05 06 07
>>
>>             6 + 78 + 78 + 42 + 1 + 8 = 213 bytes
>>
>>             ------------------------------------------------------
>>
>>             DTLS 1.3 Flight #3 PSK + ECDHE
>>
>>             -----------------------------------------------------
>>
>>             Differences compared to RPK + ECDHE
>>
>>             - Handshake Message Certificate (78 bytes)
>>
>>             - Handshake Message Certificate Verify (78 bytes)
>>
>>             213 - 78 - 78 = 57 bytes
>>
>>             ------------------------------------------------------
>>
>>             DTLS 1.3 Flight #3 PSK
>>
>>             -----------------------------------------------------
>>
>>             Differences compared to PSK + ECDHE
>>
>>             None
>>
>>             57 bytes
>>
>>             ======================================================
>>
>>             DTLS 1.3 - Cached information [RFC 7924]
>>
>>             ======================================================
>>
>>             - Cached information together with server X.509 can be used to move bytes
>>
>>             from flight #2 to flight #1
>>
>>                (cached RPK increases the number of bytes compared to cached X.509)
>>
>>             Differences compared to RPK + ECDHE
>>
>>             Flight #1
>>
>>             - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>>             + Extension - Client Cashed Information (39 bytes)
>>
>>                00 19 LL LL LL LL
>>
>>                01 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17
>>
>>             18 19 1a 1b 1c 1d 1e 1f
>>
>>             149 + 33 = 182 bytes
>>
>>             Flight #2
>>
>>             - Extension - Server Certificate Type (Raw Public Key) (6 bytes)
>>
>>             + Extension - Server Cashed Information (7 bytes)
>>
>>                00 19 LL LL LL LL 01
>>
>>             - Server Certificate (59 bytes -> 32 bytes)
>>
>>             373 - 26 = 347 bytes
>>
>>             ================================================================
>>
>>             ==============
>>
>>             Flight                                #1         #2        #3       Total
>>
>>             ------------------------------------------------------------------------------
>>
>>             DTLS 1.3 Cached X.509/RPK + ECDHE    182        347       213        742
>>
>>             DTLS 1.3 RPK + ECDHE                 149        373       213        735
>>
>>             ================================================================
>>
>>             ==============
>>
>>             ======================================================
>>
>>             DTLS 1.3 - Resumption
>>
>>             ======================================================
>>
>>             To enable resumption, a 4th flight (New Session Ticket) is added
>>
>>             Flight #4 - New Session Ticket
>>
>>             Record Header - DTLSCiphertext, Full (6 bytes) HH ES SS 43 LL LL
>>
>>                     Handshake Header - New Session Ticket (10 bytes)
>>
>>                     04 LL LL LL SS SS 00 00 00 LL LL LL
>>
>>                            Ticket Lifetime (4 bytes)
>>
>>                            00 01 02 03
>>
>>                            Ticket Age Add (4 bytes)
>>
>>                            00 01 02 03
>>
>>                            Ticket Nonce (2 bytes)
>>
>>                            01 00
>>
>>                            Ticket (6 bytes)
>>
>>                            00 04 ID ID ID ID
>>
>>                            Extensions (2 bytes)
>>
>>                            00 00
>>
>>             Auth Tag (8 bytes) // AES-CCM_8
>>
>>             00 01 02 03 04 05 06 07
>>
>>             6 + 10 + 4 + 4 + 2 + 6 + 2 + 8 = 42 bytes
>>
>>             The resumption handshake is just a PSK handshake with 136 + 150 + 57 = 343
>>
>>             bytes
>>
>>             ================================================================
>>
>>             ==============
>>
>>             Flight                                      #1     #2     #3     #4    Total
>>
>>             ------------------------------------------------------------------------------
>>
>>             DTLS 1.3 RPK + ECDHE + NewSessionTicket    149    373    213     42      777
>>
>>             DTLS 1.3 PSK (resumption)                  136    150     57             343
>>
>>             ================================================================
>>
>>             ==============
>>
>>             ======================================================
>>
>>             DTLS 1.3 - Connection ID
>>
>>             ======================================================
>>
>>             Without a Connection ID the DTLS 1.3 flight sizes changes as follows
>>
>>             DTLS 1.3 Flight #1:   -6 bytes
>>
>>             DTLS 1.3 Flight #2:   -7 bytes
>>
>>             DTLS 1.3 Flight #3:   -1 byte
>>
>>             ================================================================
>>
>>             ==============
>>
>>             Flight                                #1         #2        #3       Total
>>
>>             ------------------------------------------------------------------------------
>>
>>             DTLS 1.3 RPK + ECDHE (no cid)        143        364       212        721
>>
>>             DTLS 1.3 PSK + ECDHE (no cid)        180        183        56        419
>>
>>             DTLS 1.3 PSK (no cid)                130        143        56        329
>>
>>             ================================================================
>>
>>             ==============
>>
>>             ======================================================
>>
>>             DTLS Raw Public Keys
>>
>>             ======================================================
>>
>>             SubjectPublicKeyInfo without point compression
>>
>>             -----------------------------------------------------
>>
>>             0x30 // Sequence
>>
>>             0x59 // Size 89
>>
>>             0x30 // Sequence
>>
>>             0x13 // Size 19
>>
>>             0x06 0x07 0x2A 0x86 0x48 0xCE 0x3D 0x02 0x01.     // OID 1.2.840.10045.2.1
>>
>>             (ecPublicKey)
>>
>>             0x06 0x08 0x2A 0x86 0x48 0xCE 0x3D 0x03 0x01 0x07 // OID
>>
>>             1.2.840.10045.3.1.7 (secp256r1)
>>
>>             0x03 // Bit string
>>
>>             0x42 // Size 66
>>
>>             0x00 // Unused bits 0
>>
>>             0x04 // Uncompressed
>>
>>             ...... 64 bytes X and Y
>>
>>             Total of 91 bytes
>>
>>             SubjectPublicKeyInfo with point compression
>>
>>             -----------------------------------------------------
>>
>>             0x30 // Sequence
>>
>>             0x59 // Size 89
>>
>>             0x30 // Sequence
>>
>>             0x13 // Size 19
>>
>>             0x06 0x07 0x2A 0x86 0x48 0xCE 0x3D 0x02 0x01.     // OID 1.2.840.10045.2.1
>>
>>             (ecPublicKey)
>>
>>             0x06 0x08 0x2A 0x86 0x48 0xCE 0x3D 0x03 0x01 0x07 // OID
>>
>>             1.2.840.10045.3.1.7 (secp256r1)
>>
>>             0x03 // Bit string
>>
>>             0x42 // Size 66
>>
>>             0x00 // Unused bits 0
>>
>>             0x03 // Compressed
>>
>>             ...... 32 bytes X
>>
>>             Total of 59 bytes
>>
>>             ======================================================
>>
>>             Helpful Sources of Information
>>
>>             ======================================================
>>
>>             In addition to relevant RFCs and the estimates done by Jim, the following
>>
>>             references were helpful:
>>
>>             Every Byte Explained: The Illustrated TLS 1.3 Connection
>>
>>             https://tls13.ulfheim.net/
>>
>>             Digital Certificates for the Internet of Thingshttps://kth.diva-
>>
>>             portal.org/smash/get/diva2:1153958/FULLTEXT01.pdf
>>
>>             /John
>>
>>             -----Original Message-----
>>
>>             From: Benjamin Kaduk<kaduk@mit.edu>  <mailto:kaduk@mit.edu>
>>
>>             Date: Saturday, 3 November 2018 at 15:59
>>
>>             To: John Mattsson<john.mattsson@ericsson.com>  <mailto:john.mattsson@ericsson.com>
>>
>>             Cc:"salvador.p.f@um.es"  <mailto:salvador.p.f@um.es>  <salvador.p.f@um.es>  <mailto:salvador.p.f@um.es>,"ace@ietf.org"  <mailto:ace@ietf.org>
>>
>>             <ace@ietf.org>  <mailto:ace@ietf.org>
>>
>>             Subject: Re: [Ace] EDHOC standardization
>>
>>             On Fri, Nov 02, 2018 at 02:55:54PM +0000, John Mattsson wrote:
>>
>>                 Hi Benjamin, Salvador
>>
>>                 While DTLS 1.3 have done a very good job of lowering the overhead of the
>>
>>             record layer when application data is sent (see e.g.
>>
>>             https://tools.ietf.org/html/draft-ietf-lwig-security-protocol-comparison-01  for a
>>
>>             comparison between different protocols), I do not think the handshake protocol
>>
>>             is much leaner (is it leaner at all?).
>>
>>             (There are some handshake messages that are removed entirely.)
>>
>>                 We tried to make an fair comparison between EDHOC and TLS 1.3 in the
>>
>>             presentation at IETF 101 (see
>>
>>             https://datatracker.ietf.org/meeting/101/materials/slides-101-ace-key-
>>
>>             exchange-w-oscore-00). Since then, we have significantly optimized the
>>
>>             encoding in EDHOC and the upcoming version (-11) is expected to have the
>>
>>             following message sizes.
>>
>>                     Auth.               PSK       RPK       x5t     x5chain
>>
>>                     --------------------------------------------------------------------
>>
>>                     EDHOC message_1      43        38        38        38
>>
>>                     EDHOC message_2      47       121       127       117 + Certificate chain
>>
>>                     EDHOC message_3      12        86        92        82 + Certificate chain
>>
>>                     --------------------------------------------------------------------
>>
>>                     Total               102       245       257       237 + Certificate chains
>>
>>                 As Salvador writes, the handshakes in TLS 1.3 and DTLS 1.3 are basically the
>>
>>             same, so the numbers presented at IETF 101 should be a good estimate also for
>>
>>             DTLS 1.3.
>>
>>                     Auth.                PSK       RPK
>>
>>                     --------------------------------------------------------------------
>>
>>                     (D)TLS message_1     142       107
>>
>>                     (D)TLS message_2     135       264
>>
>>                     (D)TLS message_3      51       167
>>
>>                     --------------------------------------------------------------------
>>
>>                     Total                328       538
>>
>>             Thanks for the numbers!
>>
>>                 The numbers above include ECDHE. For handshake messages, my
>>
>>             understanding is that the DTLS 1.3 and TLS 1.3 record layer have exactly the
>>
>>             same size.
>>
>>             The DTLS 1.3 ones will be worse, due to the epoch and sequence number fields.
>>
>>             -Ben
>>
>>             _______________________________________________
>>
>>             Ace mailing list
>>
>>             Ace@ietf.org  <mailto:Ace@ietf.org>
>>
>>             https://www.ietf.org/mailman/listinfo/ace
>>
>>         _______________________________________________
>>
>>         Lwip mailing list
>>
>>         Lwip@ietf.org  <mailto:Lwip@ietf.org>
>>
>>         https://www.ietf.org/mailman/listinfo/lwip
>>
>>     -- 
>>
>>     email:rstruik.ext@gmail.com  <mailto:rstruik.ext@gmail.com>  | Skype: rstruik
>>
>>     cell: +1 (647) 867-5658 | US: +1 (415) 690-7363
>>
>> -- 
>> email:rstruik.ext@gmail.com  <mailto:rstruik.ext@gmail.com>  | Skype: rstruik
>> cell: +1 (647) 867-5658 | US: +1 (415) 690-7363
>>
>> _______________________________________________
>> Ace mailing list
>> Ace@ietf.org
>> https://www.ietf.org/mailman/listinfo/ace
>
>
> -- 
> email:rstruik.ext@gmail.com  | Skype: rstruik
> cell: +1 (647) 867-5658 | US: +1 (415) 690-7363


-- 
email: rstruik.ext@gmail.com | Skype: rstruik
cell: +1 (647) 867-5658 | US: +1 (415) 690-7363


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--------------F7B105874C0332C5717E3E32--


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Subject: [Secdispatch] Request for discussion of Concise IDs in Prague
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With the completion of CWT (RFC 8392) and CWT proof of possession
(draft-ietf-ace-cwt-proof-of-possession, submitted to IESG), we now
have a way to use COSE for authenticated assertions where previously
only RFC 5280/RFC5755 ("X.509") certificates were really applicable.
The latter are sometimes quite clumsy to use in constrained
environments, even with tricks such as
draft-raza-ace-cbor-certificates.

There has been interest in a profile specification that details how to
use CWT for these kinds of signed claims; a work in progress is
available as draft-birkholz-core-coid.  No IETF working group is
currently chartered to work on such a profile, and no single working
group jumps to mind as the obvious candidate.

A side discussion and meeting(*) was held a while ago to determine a
good solution; this side meeting came up with ACE and CORE as two
leading candidates: ACE because it already did CWT (which, however,
already was a bit of an odd addition to its charter), and CORE,
because it is interested in having such a profile available and has
the requirements (but is not itself a security area WG).

The side meeting also recommended to ask secdispatch to dispatch this
document.  Because a family tragedy kept one of the main authors away
from this, this did not happen right away; however, I would like to
make this request now, hopefully in time for a discussion in Prague.

Gr=C3=BC=C3=9Fe, Carsten

(*) In some order, I believe the participants of the discussion were:
Benjamin Kaduk <kaduk@mit.edu>,
Carsten Bormann <cabo@tzi.org>,
Henk Birkholz <henk.birkholz@sit.fraunhofer.de>,
Ivaylo Petrov <ivaylo@ackl.io>,
Jim Schaad <ietf@augustcellars.com>,
Matthew Miller <linuxwolf+ietf@outer-planes.net>,
Richard Barnes <rlb@ipv.sx>,
Roman Danyliw <rdd@cert.org>,



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--=-=-=
Content-Type: text/plain


Carsten Bormann <cabo@tzi.org> wrote:
    > A side discussion and meeting(*) was held a while ago to determine a
    > good solution; this side meeting came up with ACE and CORE as two
    > leading candidates: ACE because it already did CWT (which, however,
    > already was a bit of an odd addition to its charter), and CORE,
    > because it is interested in having such a profile available and has
    > the requirements (but is not itself a security area WG).

I had asked why not CBOR WG, and it might be useful to share your answer.

    > The side meeting also recommended to ask secdispatch to dispatch this
    > document.  Because a family tragedy kept one of the main authors away
    > from this, this did not happen right away; however, I would like to
    > make this request now, hopefully in time for a discussion in Prague.

+1

I am also aware of a few other groups that would be interested in
ConciseIDs, but I don't speak for them, so I've asked them to speak up
themselves.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-




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On Mar 17, 2019, at 21:41, Michael Richardson <mcr+ietf@sandelman.ca> =
wrote:
>=20
> Carsten Bormann <cabo@tzi.org> wrote:
>> A side discussion and meeting(*) was held a while ago to determine a
>> good solution; this side meeting came up with ACE and CORE as two
>> leading candidates: ACE because it already did CWT (which, however,
>> already was a bit of an odd addition to its charter), and CORE,
>> because it is interested in having such a profile available and has
>> the requirements (but is not itself a security area WG).
>=20
> I had asked why not CBOR WG, and it might be useful to share your =
answer.

The CBOR WG is really more concerned with the integrity of the CBOR =
standard itself and with the CDDL notation for structural =
interoperability (=E2=80=9Csyntax=E2=80=9D).  Concise IDs are an =
application of CWTs and COSE, which are in turn an application of CBOR.  =
Concise IDs are much closer to the applications that the CoRE WG is =
looking at, than to features and functions of CBOR (or CDDL).

In the end, of course, the parties interested will come to whatever WG =
that runs the process; I would just imagine that with CoRE (and possibly =
ACE) quite a few of the interested parties would already be there, and =
the WG as a whole will be more in a position to provide its collected =
expertise in this area.

Gr=C3=BC=C3=9Fe, Carsten


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To: =?UTF-8?Q?G=c3=b6ran_Selander?= <goran.selander@ericsson.com>, John Mattsson <john.mattsson@ericsson.com>
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From: Rene Struik <rstruik.ext@gmail.com>
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Subject: Re: [Secdispatch] [Ace] (details on use case scenario?) Re: [Lwip] EDHOC standardization
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Hi Goran:

Unfortunately, it is not clear at all. Details matter: one cannot simply 
wave a magic wand ("not yet defined, but is expected to", etc, etc.).

I am not a big believer in protocol design by email exchange. Security 
protocol design is hard, as is also evidenced by the document history of 
[1], where the initial document was produced in Sep 2016, adopted as WG 
document in Nov 2016, relabeled as another WG document sprout in Sep 
2017 ... and now it is March 2019. Doesn't protocol design start on a 
white board, where one has an initial idea and then systematically work 
through issues, revisits assumptions, etc., rather than produce 
documents and then write the rationale after the fact?

I do not understand the current flurry of emails to push a particular 
design through: why not first coming up with a design requirements 
document that goes further than "byte-count" arguments?

One can do more analysis in the prelude to Montreal, but this is only 
meaningful if one does not cast things in concrete first and then ask 
for feedback, with some external "clients" (including the 6tisch use 
case that I questioned) as motivation. I do understand the motivation to 
claim a stake, but if intention is to reach a billion+ devices, I think 
the bar should be really high.

Ref: 
[1]https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zerotouch-join/

[excerpt of what you wrote below]
6TiSCH minimal security [4] specifies how a Pledge joining a new network 
communicates using CoAP with the JRC via a Join Proxy and over 
additional hops. The proxy operations in the Join Proxy incurs certain 
overhead in the communication between Proxy and JRC. The exact procedure 
for the zero-touch is not yet defined, but it is expected to reuse 
features of the Join Proxy in the minimal security setting. The 
benchmark in [2] is based on this setting but replacing the OSCORE 
protection of CoAP with the AKE protocol messages carried over CoAP. *Is 
it more clear now?*

On 3/18/2019 6:08 AM, Göran Selander wrote:
>
> Hi Rene,
>
> Sorry for slow response to your mails.
>
> *From: *Rene Struik <rstruik.ext@gmail.com <mailto:rstruik.ext@gmail.com>>
> *Date: *Friday, 15 March 2019 at 15:28
> *To: *Göran Selander <goran.selander@ericsson.com 
> <mailto:goran.selander@ericsson.com>>, John Mattsson 
> <john.mattsson@ericsson.com <mailto:john.mattsson@ericsson.com>>
> *Cc: *"secdispatch@ietf.org <mailto:secdispatch@ietf.org>" 
> <secdispatch@ietf.org <mailto:secdispatch@ietf.org>>, 'Benjamin Kaduk' 
> <kaduk@mit.edu <mailto:kaduk@mit.edu>>, "ace@ietf.org 
> <mailto:ace@ietf.org>" <ace@ietf.org <mailto:ace@ietf.org>>
> *Subject: *Re: [Ace] (details on use case scenario?) Re: [Lwip] EDHOC 
> standardization
>
> Hi Goran:
>
> As you recall, I suggested to look at some details of 6TiSCH 
> enrollment (see my message of March 4, 2019 [1]). During the 
> SecDispatch interim of March 5, 2019, this was provided as one use 
> case scenario [2] and reiterated in your email of yesterday, March 14, 
> 2019 [3]. Nevertheless, details on how this could be realized in 
> practice are still missing.
>
> I had another look at the 6TiSCH minimal security draft [1] (now in 
> 2nd WGLC) and the "zero-touch" write-up [5] -- which you both 
> referenced in your email [3] of yesterday.
>
> To my understanding, the intention with 6TiSCH is to reuse the 
> protocol flows of [4] to implement a public-key based enrollment 
> scheme in the future. This seems to be what [5] aims for, if I try and 
> read in between the [still unwritten] lines, and the impression I got 
> from some people. From looking at the protocol details, though, I do 
> not understand how this can be done in practice. This begs the 
> question what I am missing here.
>
> Hence, my question of March 4th on details of use case scenarios still 
> stands. In fact, I do not see how one could implement EDHOC on top of 
> [4], even if one only uses symmetric-key only variant of EDHOC.
>
> If you could shed some light on this, this would help. Or, should we 
> simply abandon that use case as being unrealistic at this point?
>
> 6TiSCH minimal security [4] specifies how a Pledge joining a new 
> network communicates using CoAP with the JRC via a Join Proxy and over 
> additional hops. The proxy operations in the Join Proxy incurs certain 
> overhead in the communication between Proxy and JRC. The exact 
> procedure for the zero-touch is not yet defined, but it is expected to 
> reuse features of the Join Proxy in the minimal security setting. The 
> benchmark in [2] is based on this setting but replacing the OSCORE 
> protection of CoAP with the AKE protocol messages carried over 
> CoAP. Is it more clear now?
>
> Finally, your email [1] suggests "reports of massive breaches with PSK 
> provisioning systems". If so, I would strongly suggest having another 
> look at [4] and commenting on this.
>
> I’m not sure exactly what you want me to comment on. Clearly there are 
> weakness with PSK based systems w/o PFS. But PSK w/o PFS is still used 
> for various reasons, including inability to deploy better security. 
> This inability may be real due to performance limitations or only 
> perceived, for example due to unawareness of intermediary provisioning 
> schemes between PSK and certificates, but in any case PSK w/o PFS is 
> clearly a better alternative than no security at all. One purpose of 
> the work we discuss here is to lower the threshold for PFS.
>
> You mentioned in a previous mail other limitations in the multi-hop 
> setting besides message sizes, and that is indeed true - this is just 
> one benchmark. Is there some specific characteristic you want to 
> highlight in this context?
>
> RS>> My 10-hop enrollment use case was aimed to force consideration of
>
> not just abstract "protocol flow arrows", but also effects on the
>
> network and its actors. A simple byte-count is not enough...
>
> <<RS
>
> Göran
>
> Ref:
>
> [1] Details on Use Case Scenarios, email RS of March 4, 2019. 
> Seehttps://mailarchive.ietf.org/arch/msg/ace/On0iIFAb_OWeBqLjlryi1rBHwhk
>
> [2] Slides on EDHOC during SecDispatch meeting of March 5, 2019. 
> Seehttps://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/materials/slides-interim-2019-secdispatch-01-sessa-edhoc.pdf
>
> [3] Pitch for EDHOC, email Goran Selander of March 14, 2019. 
> Seehttps://mailarchive.ietf.org/arch/msg/secdispatch/vNR7nT20fsvYjYXhAPjOpLjZGCU
>
> [4] draft-ietf-6tisch-minimal-security-09
> [5] draft-ietf-6tisch-dtsecurity-zerotouch-join-03
>

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    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US">Hi
        Goran:</span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US"><br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US">Unfortunately,
        it is not clear at all. Details matter: one cannot simply wave a
        magic wand ("not yet defined, but is expected to", etc, etc.).<br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US"><br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US">I
        am not a big believer in protocol design by email exchange.
        Security protocol design is hard, as is also evidenced by the
        document history of [1], where the initial document was produced
        in Sep 2016, adopted as WG document in Nov 2016, relabeled as
        another WG document sprout in Sep 2017 ... and now it is March
        2019. Doesn't protocol design start on a white board, where one
        has an initial idea and then systematically work through issues,
        revisits assumptions, etc., rather than produce documents and
        then write the rationale after the fact?<br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US"><br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US">
        I do not understand the current flurry of emails to push a
        particular design through: why not first coming up with a design
        requirements document that goes further than "byte-count"
        arguments?</span><span style="color:black" lang="EN-US"> <br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US"><br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US">One
        can do more analysis in the prelude to Montreal, but this is
        only meaningful if one does not cast things in concrete first
        and then ask for feedback, with some external "clients"
        (including the 6tisch use case that I questioned) as motivation.
        I do understand the motivation to claim a stake, but if
        intention is to reach a billion+ devices, I think the bar should
        be really high. <br>
      </span></div>
    <div class="moz-cite-prefix"><br>
      <span style="color:black" lang="EN-US"></span><span
        style="color:black" lang="EN-US"></span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US">Ref:
        [1]</span><small style="box-sizing: border-box; font-size:
        16.9px; font-weight: 400; line-height: 1; color: rgb(119, 119,
        119);">
<a class="moz-txt-link-freetext" href="https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zerotouch-join/">https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zerotouch-join/</a></small><span
        style="color:black" lang="EN-US"></span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US"><br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US">[excerpt
        of what you wrote below]<br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US">6TiSCH
        minimal security [4] specifies how a Pledge joining a new
        network communicates using CoAP with the JRC via a Join Proxy
        and over additional hops. The proxy operations in the Join Proxy
        incurs certain overhead in the communication between Proxy and
        JRC. The exact procedure for the zero-touch is not yet defined,
        but it is expected to reuse features of the Join Proxy in the
        minimal security setting. The benchmark in [2] is based on this
        setting but replacing the OSCORE protection of CoAP with the AKE
        protocol messages carried over CoAP. <b>Is it more clear now?</b></span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US"><br>
      </span></div>
    <div class="moz-cite-prefix"><span style="color:black" lang="EN-US"></span>On
      3/18/2019 6:08 AM, Göran Selander wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:065BA537-5AC7-46A3-A08C-4403FC80E13F@ericsson.com">
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      <div class="WordSection1">
        <p class="MsoNormal"><span style="color:black" lang="EN-US">Hi
            Rene,<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US">Sorry
            for slow response to your mails.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><b><span
              style="font-size:12.0pt;color:black" lang="EN-US">From: </span></b><span
            style="font-size:12.0pt;color:black" lang="EN-US">Rene
            Struik &lt;<a href="mailto:rstruik.ext@gmail.com"
              moz-do-not-send="true"><span style="color:purple">rstruik.ext@gmail.com</span></a>&gt;<br>
            <b>Date: </b>Friday, 15 March 2019 at 15:28<br>
            <b>To: </b>Göran Selander &lt;<a
              href="mailto:goran.selander@ericsson.com"
              moz-do-not-send="true"><span style="color:purple">goran.selander@ericsson.com</span></a>&gt;,
            John Mattsson &lt;<a
              href="mailto:john.mattsson@ericsson.com"
              moz-do-not-send="true"><span style="color:purple">john.mattsson@ericsson.com</span></a>&gt;<br>
            <b>Cc: </b>"<a href="mailto:secdispatch@ietf.org"
              moz-do-not-send="true"><span style="color:purple">secdispatch@ietf.org</span></a>"
            &lt;<a href="mailto:secdispatch@ietf.org"
              moz-do-not-send="true"><span style="color:purple">secdispatch@ietf.org</span></a>&gt;,
            'Benjamin Kaduk' &lt;<a href="mailto:kaduk@mit.edu"
              moz-do-not-send="true"><span style="color:purple">kaduk@mit.edu</span></a>&gt;,
            "<a href="mailto:ace@ietf.org" moz-do-not-send="true"><span
                style="color:purple">ace@ietf.org</span></a>" &lt;<a
              href="mailto:ace@ietf.org" moz-do-not-send="true"><span
                style="color:purple">ace@ietf.org</span></a>&gt;<br>
            <b>Subject: </b>Re: [Ace] (details on use case scenario?)
            Re: [Lwip] EDHOC standardization</span><span
            style="color:black" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">Hi Goran:<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">As you recall, I suggested
            to look at some details of 6TiSCH enrollment (see my message
            of March 4, 2019 [1]). During the SecDispatch interim of
            March 5, 2019, this was provided as one use case scenario
            [2] and reiterated in your email of yesterday, March 14,
            2019 [3]. Nevertheless, details on how this could be
            realized in practice are still missing.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">I had another look at the
            6TiSCH minimal security draft [1] (now in 2nd WGLC) and the
            "zero-touch" write-up [5] -- which you both referenced in
            your email [3] of yesterday.<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">To my understanding, the
            intention with 6TiSCH is to reuse the protocol flows of [4]
            to implement a public-key based enrollment scheme in the
            future. This seems to be what [5] aims for, if I try and
            read in between the [still unwritten] lines, and the
            impression I got from some people. From looking at the
            protocol details, though, I do not understand how this can
            be done in practice. This begs the question what I am
            missing here.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">Hence, my question of March
            4th on details of use case scenarios still stands. In fact,
            I do not see how one could implement EDHOC on top of [4],
            even if one only uses symmetric-key only variant of EDHOC. <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">If you could shed some
            light on this, this would help. Or, should we simply abandon
            that use case as being unrealistic at this point?<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US">6TiSCH
            minimal security [4] specifies how a Pledge joining a new
            network communicates using CoAP with the JRC via a Join
            Proxy and over additional hops. The proxy operations in the
            Join Proxy incurs certain overhead in the communication
            between Proxy and JRC. The exact procedure for the
            zero-touch is not yet defined, but it is expected to reuse
            features of the Join Proxy in the minimal security setting.
            The benchmark in [2] is based on this setting but replacing
            the OSCORE protection of CoAP with the AKE protocol messages
            carried over CoAP. Is it more clear now?<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US">  <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">Finally, your email [1]
            suggests "reports of massive breaches with PSK provisioning
            systems". If so, I would strongly suggest having another
            look at [4] and commenting on this.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US">I’m
            not sure exactly what you want me to comment on. Clearly
            there are weakness with PSK based systems w/o PFS. But PSK
            w/o PFS is still used for various reasons, including
            inability to deploy better security. This inability may be
            real due to performance limitations or only perceived, for
            example due to unawareness of intermediary provisioning
            schemes between PSK and certificates, but in any case PSK
            w/o PFS is clearly a better alternative than no security at
            all. One purpose of the work we discuss here is to lower the
            threshold for PFS.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US">You
            mentioned in a previous mail other limitations in the
            multi-hop setting besides message sizes, and that is indeed
            true - this is just one benchmark. Is there some specific
            characteristic you want to highlight in this context?<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US"> </span><span
            style="color:black" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">RS&gt;&gt; My 10-hop
            enrollment use case was aimed to force consideration of</span><span
            style="color:black" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">not just abstract
            "protocol flow arrows", but also effects on the</span><span
            style="color:black" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">network and its actors.
            A simple byte-count is not enough...</span><span
            style="color:black" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">&lt;&lt;RS</span><span
            style="color:black" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:black" lang="EN-US">Göran<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US"> <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">Ref:<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">[1] Details on Use Case
            Scenarios, email RS of March 4, 2019. See</span><span
            style="color:black"><a
href="https://mailarchive.ietf.org/arch/msg/ace/On0iIFAb_OWeBqLjlryi1rBHwhk"
              moz-do-not-send="true"><span style="color:purple"
                lang="EN-US">https://mailarchive.ietf.org/arch/msg/ace/On0iIFAb_OWeBqLjlryi1rBHwhk</span></a></span><span
            style="color:black" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">[2] Slides on EDHOC during
            SecDispatch meeting of March 5, 2019. See</span><span
            style="color:black"><a
href="https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/materials/slides-interim-2019-secdispatch-01-sessa-edhoc.pdf"
              moz-do-not-send="true"><span style="color:purple"
                lang="EN-US">https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/materials/slides-interim-2019-secdispatch-01-sessa-edhoc.pdf</span></a></span><span
            style="color:black" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">[3] Pitch for EDHOC, email
            Goran Selander of March 14, 2019. See</span><span
            style="color:black"><a
href="https://mailarchive.ietf.org/arch/msg/secdispatch/vNR7nT20fsvYjYXhAPjOpLjZGCU"
              moz-do-not-send="true"><span style="color:purple"
                lang="EN-US">https://mailarchive.ietf.org/arch/msg/secdispatch/vNR7nT20fsvYjYXhAPjOpLjZGCU</span></a></span><span
            style="color:black" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:36.0pt"><span
            style="color:black" lang="EN-US">[4]
            draft-ietf-6tisch-minimal-security-09<br>
            [5] draft-ietf-6tisch-dtsecurity-zerotouch-join-03<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-family:&quot;-webkit-standard&quot;,serif;color:black"
            lang="EN-US"><o:p> </o:p></span></p>
        <pre style="margin-left:36.0pt"><o:p> </o:p></pre>
      </div>
    </blockquote>
    <p><br>
    </p>
    <pre class="moz-signature" cols="72">-- 
email: <a class="moz-txt-link-abbreviated" href="mailto:rstruik.ext@gmail.com">rstruik.ext@gmail.com</a> | Skype: rstruik
cell: +1 (647) 867-5658 | US: +1 (415) 690-7363</pre>
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Subject: [Secdispatch] Introducing MASQUE
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Hi secdispatch,

I'd like to share a draft I've recently uploaded:
https://tools.ietf.org/html/draft-schinazi-masque-00

It introduces MASQUE, a protocol for obfuscating a VPN server inside an
HTTP/3 (or HTTP/2) web server. The proposal is pretty new so we'd love to
hear some opinions about how effectively it meets its security goals (or,
alternatively: how poorly it runs its own crypto).

We'll be presenting the draft in Prague - at secdispatch to review the
security aspects and in tsv-area to look into the transport impact.

Thanks,
David

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<div dir=3D"ltr"><div dir=3D"ltr">Hi secdispatch,<div><br></div><div>I&#39;=
d like to share a draft I&#39;ve recently uploaded:</div><div><a href=3D"ht=
tps://tools.ietf.org/html/draft-schinazi-masque-00">https://tools.ietf.org/=
html/draft-schinazi-masque-00</a><br></div><div><br></div><div>It introduce=
s MASQUE, a protocol for obfuscating a VPN server inside an HTTP/3 (or HTTP=
/2) web server. The proposal is pretty new so we&#39;d love to hear some op=
inions about how effectively it meets its security goals (or, alternatively=
: how poorly it runs its own crypto).</div><div><br></div><div>We&#39;ll be=
 presenting the draft in Prague - at secdispatch to review the security asp=
ects and in tsv-area to look into the transport impact.</div><div><br></div=
><div>Thanks,</div><div>David</div></div></div>

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Subject: Re: [Secdispatch] Introducing MASQUE
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Interesting!

My instant suggestion is to dedicate some effort to allow the performance
issues of the VPN server to be observed by the HTTP frontend (after
decryption obviously). Otherwise you may have the same issue we have now
with Websockets: if a targeted app layer DDoS brings a WS server down, it's
almost non-traceable in the HTTP access log.

Aiming for that should be complicated but would allow for better DDoS
resilience, which would be valuable for those individuals hosting HTTP/2-3
servers you're targeting.

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<div dir=3D"auto"><div dir=3D"auto">Interesting!</div><div dir=3D"auto"><br=
></div>My instant suggestion is to dedicate some effort to allow the perfor=
mance issues of the VPN server to be observed by the HTTP frontend (after d=
ecryption obviously). Otherwise you may have the same issue we have now wit=
h Websockets: if a targeted app layer DDoS brings a WS server down, it&#39;=
s almost non-traceable in the HTTP access log.<div dir=3D"auto"><br></div><=
div dir=3D"auto">Aiming for that should be complicated but would allow for =
better DDoS resilience, which would be valuable for those individuals hosti=
ng HTTP/2-3 servers you&#39;re targeting.<br><div dir=3D"auto"><br></div><d=
iv dir=3D"auto">--</div><div dir=3D"auto">T=C3=B6ma</div></div></div>

--000000000000f2e571058465d502--


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From: Roman Danyliw <rdd@cert.org>
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Thread-Topic: Quick summary of Virtual Interim on 03/05/2019
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Date: Tue, 19 Mar 2019 16:55:42 +0000
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From: David Schinazi <dschinazi.ietf@gmail.com>
Date: Tue, 19 Mar 2019 10:34:02 -0700
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Subject: Re: [Secdispatch] Introducing MASQUE
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--000000000000e1e633058475e9f5
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Thanks T=C3=B6ma. I agree with you - I'll add some text as implementor guid=
ance.

David

On Mon, Mar 18, 2019 at 3:23 PM T=C3=B6ma Gavrichenkov <ximaera@gmail.com> =
wrote:

> Interesting!
>
> My instant suggestion is to dedicate some effort to allow the performance
> issues of the VPN server to be observed by the HTTP frontend (after
> decryption obviously). Otherwise you may have the same issue we have now
> with Websockets: if a targeted app layer DDoS brings a WS server down, it=
's
> almost non-traceable in the HTTP access log.
>
> Aiming for that should be complicated but would allow for better DDoS
> resilience, which would be valuable for those individuals hosting HTTP/2-=
3
> servers you're targeting.
>
> --
> T=C3=B6ma
>

--000000000000e1e633058475e9f5
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<div dir=3D"ltr"><div dir=3D"ltr">Thanks=C2=A0T=C3=B6ma. I agree with you -=
 I&#39;ll add some text as implementor guidance.</div><div dir=3D"ltr"><br>=
</div><div>David</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr"=
 class=3D"gmail_attr">On Mon, Mar 18, 2019 at 3:23 PM T=C3=B6ma Gavrichenko=
v &lt;<a href=3D"mailto:ximaera@gmail.com">ximaera@gmail.com</a>&gt; wrote:=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"aut=
o"><div dir=3D"auto">Interesting!</div><div dir=3D"auto"><br></div>My insta=
nt suggestion is to dedicate some effort to allow the performance issues of=
 the VPN server to be observed by the HTTP frontend (after decryption obvio=
usly). Otherwise you may have the same issue we have now with Websockets: i=
f a targeted app layer DDoS brings a WS server down, it&#39;s almost non-tr=
aceable in the HTTP access log.<div dir=3D"auto"><br></div><div dir=3D"auto=
">Aiming for that should be complicated but would allow for better DDoS res=
ilience, which would be valuable for those individuals hosting HTTP/2-3 ser=
vers you&#39;re targeting.<br><div dir=3D"auto"><br></div><div dir=3D"auto"=
>--</div><div dir=3D"auto">T=C3=B6ma</div></div></div>
</blockquote></div>

--000000000000e1e633058475e9f5--


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--_000_32FB302879FB4B56BB55D9AEB13F6F31akamaicom_--


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Subject: [Secdispatch] fyi: SECDISPATCH WG Summary from IETF 104
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-------- Forwarded Message --------
Subject: [saag] SECDISPATCH WG Summary from IETF 104
Date: Mon, 25 Mar 2019 19:13:58 +0000
From: Roman Danyliw <rdd@cert.org>
To: saag@ietf.org <saag@ietf.org>

The SECDISPATCH WG met on Tuesday afternoon.  The agenda items were 
dispatched as follows:

(1) draft-mccain-keylist -- continue discussion on IETF OpenPGP mailing 
list (openpgp@ietf.org) to grow interest

(2) draft-rundgren-json-canonicalization-scheme -- not security area 
work; bring to ART

(3) draft-schinazi-masque -- needs more discussion; non-WG IETF mailing 
list will be created

(4) draft-gont-predictable-numeric-ids -- ADs will follow-up work to 
define right venue

(5) draft-birkholz-core-coid -- BOF recommended

(6) draft-raza-ace-cbor-certificates -- BOF recommended

_______


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  > Security Dispatch (SECDISPATCH) WG Agenda
  > IETF 104
  >
  > Monday, March 25, 2019
  > 1350 - 1550, Afternoon Session I
  > Congress Hall 3
  >
  > (1) Logistics and introduction (chairs, 5 min)
  >
  > (2) Dispatch items
  > (Each item is 15 minutes)
  >
  > (2.1) Distributing OpenPGP Keys with Signed Keylist Subscriptions
  > draft: https://tools.ietf.org/html/draft-mccain-keylist
  > presenter: Miles McCain*
  > background: 
<https://mailarchive.ietf.org/arch/msg/secdispatch/3C0fhVxGoC3KUi6zKtinceJzqW8>

slides: 
<https://datatracker.ietf.org/meeting/104/materials/slides-104-secdispatch-distributing-openpgp-key-fingerprints-with-signed-keylist-subscriptions-draft-mccain-keylist-01>

https://tools.ietf.org/html/draft-mccain-keylist

ekr: keylist contains fp of public key and u said u can <what?>

dkg: this is a fp of your openpgp cert, rfc<48??>, u can update it 
without changing your fp

rbarnes: any need for hash agility here?
dkg: this draft is not correct place to address that, rather do that 
where opgp FPs are spec'd

benkaduk(bk): what about mult domains for the keys?  use "wkd" ?

micahl: <something about how non-scaleable the wkd stuff is?>

bk: are we claiming the sig from authnority key is authoritative for the 
neame and email address?

micahl(ml): what's signed here is entire PGP sig block, only required 
field is FP field...

dkg: this is innaresting soln, dont want to dive into details here, but 
I run a key server in this network, it is a disaster, it cant wishstand 
attack, if this draft depends on the keyserver netw, that needs to be 
re-considered, don't know how to dispatch this work...  thinks keyserver 
netw will not survive...

ml: gpgsync depands on keyserver netw, and that perhaps needs to be 
changed, not sure to what at this point....

chairs: we need to discuss keyserver issues it seems...

dkg: gpg keyrings might be a way to do this
ml: nominally agrees...

ekr: what does the signature actually represent?
ml: the purp of the signature on this keylist file prevents an atkr from 
putting an arbitrary list of public keys on folks' computers...

bk: it says 'these are keys ur innarested in of folks in your org...'


rbarnes: is this approp for AD sponsorship? (no one ran to mic)

    but first is this approp for doing in IETF? (no objections... no one 
runs to mic...)

    is anyone besides authors innarested in the work?  (4 or 5 hands)


leif johansson: there's subtleties here, ought to get careful review, 
things like this have been attempted in ietf before, so thinks it ought 
to be a good idea for a WG to look this more in depth, but realizes that 
may not happen...

Roman Danyliw(rd, co-chair): authors ought to continue to discuss on 
openpgp@ietf.org <mailto:openpgp@ietf.org>

ekr: as AD: yes, please continue to discuss on openpgp@ietf.org 
<mailto:openpgp@ietf.org>, and the authors bring it back to secdispatch 
when they feel it's ready for publication and we'll go from there


  > (2.2) JSON Canonicalization Scheme (JCS)
  > draft: 
https://tools.ietf.org/html/draft-rundgren-json-canonicalization-scheme
  > presenter: Anders Rundgren
  > background: 
https://mailarchive.ietf.org/arch/msg/secdispatch/UHnVM_tzXh_s1WziznIiWVNSC4A

slides: 
<https://datatracker.ietf.org/meeting/104/materials/slides-104-dispatch-json-canonicalization-scheme-jcs-00>
draft: 
https://tools.ietf.org/html/draft-rundgren-json-canonicalization-scheme

? cloudflare: ASN.1 should be (de)serializable, since that doesn't work 
round-trip, am skeptical that this would work...

Anders Rundgren(ar): slide 4 shows only known problem

matt miller(mm): this was discussed in ART Dispatch, there were 
questions, need to answer them...

yoav nir(yn): why we here in sec dispatch rather than art dispatch..?

ar: this is for sec protocols thus presenting here...

yn: yes this is just a bilding block for crypto protocols....

bret jordan: thinks this is worthwhile work, have tested some of the 
impls and they work, know of projects that could use this...

ekr: as individ: motivation seems weak, it is just readability afaict, 
canonicalization historiically has been a debacle, not desirable to have 
raw data and sig intermixed, thinks this is something we ought to not pursue

sean tuner: json is not really in ietf (cf ecma), there's history to 
that discussion, ask mm

mm: there was abs no consensus wrt json canonicalizatoin...

ar: see notes wrt above in the draft...

leif: thinks this approach is dangerous cuz folks may use the data 
before validating the signature

carsten: < not want to do in sec area? >

r barnes: as co-chair: ok, this is not SecDispatch work, pursue in ART 
Dispatch.





  > (2.3) MASQUE, obfuscating networking applications behind an HTTPS 
web server
  > draft: https://tools.ietf.org/html/draft-schinazi-masque
  > presenter: David Schinazi
  > background: 
<https://mailarchive.ietf.org/arch/msg/secdispatch/pG11oYDZTtH97iFebtQceXaSfS8>

slides: 
<https://datatracker.ietf.org/meeting/104/materials/slides-104-secdispatch-the-masque-protocol-draft-schinazi-masque-00>
draft:
https://tools.ietf.org/html/draft-schinazi-masque

martin thompson(mt): notes that there are lots of issues with this cf 
traffic analysis...big issue...

David Schinazi(ds): i'm asking for help on that...

dkg: yes, ietf has said "traffic analysis is outta scope" forever, lots 
of innaresting ideas here...

kathleen: <missed it>

rbarnes: dispatch outcome: this needs more work

benk: enuff folks here willing to join mailing list to discuss?

ds: ok, will ask for an ietf non-wg list...



  > (2.4) Security and Privacy Implications of Numeric Identifiers 
Employed in Network Protocols
  > draft: https://tools.ietf.org/html/draft-gont-predictable-numeric-ids
  > presenter: Fernando Gont
  > background: 
https://mailarchive.ietf.org/arch/msg/secdispatch/CXuvV5pW3Wik7Yl1fChZiNPkMwQ

slides: 
<https://datatracker.ietf.org/meeting/104/materials/slides-104-secdispatch-security-and-privacy-implications-of-numeric-identifiers-employed-in-network-protocols-draft-gont-predictable-numeric-ids-00>
draft: https://tools.ietf.org/html/draft-gont-predictable-numeric-ids

dkg: thinks this is innaresting as a bcp for protocol designers...

benK: have bcps for prot designers and not many know about them...

rd: co-chair as individ: wonder whether this ought to be in IRTF ?

ekr: wondering why not mission accomplished already cuz I-Ds live 
forever now?

watson ladd: wants an RFC

dkg: no draft expiration is a meta-meta discussion...

rd co-chair: generraly there's elements of interest in this, but no one 
saying we gotta make this an RFC...

dkg: well watson DID say I want an RFC I can point to in the next RFC I 
write!

rd co-chair: do we have any guidance on how to get there?  maybe SMART ?

watson: maybe CFRG?

rbarnes: priv RG?

dkg: RGs are often not expected to put restrictions on IETF RFCs...


Fernando Gont(fg):  proposing a BCP for a chunk of this for above reasons...

benk: trying to look into this earlier today, yes there's a bunch of 
info scattered here & yon, perhaps we pub a timeline to gathering it all 
togetther, initially...

rd co-chair: yeah, that...

sfarrell: if u wanna pub an RFC, do that, then it can be made a bcp 
later, cf rfc1984

benk: yeah, < one can do the above >, note that watson just needs an RFC 
to refer to as a normative ref...

rd co-chair: we'll try to help you sort this out in terms of publishing 
options...

fg: have heard that in the past, we want to make prog this time...



  > (2.5) Concise IDs and CBOR Certificates
  > drafts:
  > https://tools.ietf.org/html/draft-birkholz-core-coid
  > https://tools.ietf.org/html/draft-raza-ace-cbor-certificates
  > presenter: Carsten Bormann, John Mattsson
  > background: 
https://mailarchive.ietf.org/arch/msg/secdispatch/CGlf3NB2yhLyRgpyBpogPzi3CDQ
slides: 
<https://datatracker.ietf.org/meeting/104/materials/slides-104-secdispatch-concise-identities-draft-birkholz-core-coid-00>
draft: https://tools.ietf.org/html/draft-birkholz-core-coid

Carsten Bormann(cb): i'm talking about draft-birkholz-core-coid, jm 
(below) will be talking about something that seems similar but is 
different... I'm talking about "Profiling CWT for authenticated assertions"


John Mattsson(jm): talking about "Related Work, outside scope of CoIDs", 
ie Re-encoding X.509 certificates in CBOR 
(draft-raza-acecbor-certificates-01)
john's slides: "CBOR Certs" 
<https://datatracker.ietf.org/meeting/104/materials/slides-104-secdispatch-cbor-profile-of-x509-certificates-draft-raza-ace-cbor-certificates-01>


rd co-chair: pls goto mic if you want to help dispatch this...

ekr: hm x.509 started like 25yrs ago and look were we ended up... so, 
no, this needs to have its own WG

Giri M(gm): existing svc providers will want to not adopt something like 
this, and if IoT ends up using something like there, then need to define 
middlemen to convert btwn formats...

cb: this is sposed to solve probs where x509 does not work well, does 
not expect a need to gateways to spring up for this, jm's answer will be 
different...

jm: yes folks will convert btwn the formats...

?: do I just... <missed it>

sean turner: dont mess around -- just define a new format :)    dont be 
surprised you'll end up iwth a mess like the orig...

cb: if ur happy with x509, this work is not for u...

sfarrell: hard to do signif better than x509, good luck -- seems only 
advantage u have is encoding size...  pkix lasted 18+ yrs...

rbarnes: loves asn1, one can (de)serial round trip and end up iwth diff 
bytes (!)  8^)    how will this end up better?   also, there's work in 
TLS on cert compression, how is this better?

jm: yeah, need to do actual comparisons there, no clear answers yet, 
hear this is better but dont have proof presently

?1 (mic): knows of a national CA that wants this or something like it, 
so dont laff, ....

?2 (mic): certs are one thing in a PKI, there's lots of other 
datastructs in there too, are you going to update them all?

cb: well a signing req is just a CWT, so we can just reduce the # of 
variations we need...

coauthor of the cbor cert draft: question for sec cummunity: lots of 
examples of IoT folks who want to ship devices with certs, issues there, 
if u dont like these proposals, what do you propose?

rbarnes co-chair: this does not sound approp for secdispatch, seems to 
require a BoF



  > (3) Summary (chairs, 10 min)

impromptu addition: J. Hall (cdt): draft-hall-censorship-tech-07
   please review!!!


[saag] SECDISPATCH WG Summary from IETF 104
Roman Danyliw <rdd@cert.org> Mon, 25 March 2019 19:14 UTC
https://mailarchive.ietf.org/arch/msg/saag/v6QlgdtcoyIgI58eSCVB8d3fxMo

The SECDISPATCH WG met on Tuesday afternoon.  The agenda items were 
dispatched as follows:

(1) draft-mccain-keylist -- continue discussion on IETF OpenPGP mailing 
list (openpgp@ietf.org) to grow interest

(2) draft-rundgren-json-canonicalization-scheme -- not security area 
work; bring to ART

(3) draft-schinazi-masque -- needs more discussion; non-WG IETF mailing 
list will be created

(4) draft-gont-predictable-numeric-ids -- ADs will follow-up work to 
define right venue

(5) draft-birkholz-core-coid -- BOF recommended

(6) draft-raza-ace-cbor-certificates -- BOF recommended


end


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From: jeff.hodges@kingsmountain.com
To: Richard Barnes <rlb@ipv.sx>, Roman Danyliw <rdd@cert.org>, Kathleen.Moriarty.ietf@gmail.com
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Subject: Re: [Secdispatch] review request: draft-hodges-webauthn-registries-02
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Hi,

There have not been replies to the below inquiry on the mailing list,  
and I regrettably neglected to mention it during the secdispatch  
session yesterday here at IETF-104 (e.g., at the session end; I claim  
being distracted by dutifully taking minutes...).

Anyway, are there any objections to Ben AD-sponsoring  
`draft-hodges-webauthn-registries` ?

I and my co-authors (Mike Jones, Giri Mandyam) are around this week if  
y'all wish to chat f2f.


thanks,

=JeffH


---
<Jeff.Hodges@Kingsmountain.com> scrawled on Tue, 12 March 2019 19:43 UTC:

Hi,

The WebAuthn spec recently attained Recommendation status [1][2], thus
it is time to progress draft-hodges-webauthn-registries-02 [3].

The latter I-D simply defines two IANA registries for W3C Web
Authentication attestation statement format identifiers and extension
identifiers.

Kathleen had initially AD-sponsored draft-hodges-webauthn-registries --
we're asking secdispatch to have Ben continue this sponsorship.

We're happy to discuss during the SecDispatch session at IETF-104 Prague
if y'all wish.

Thanks,

=JeffH, Mike Jones, Giri Mandyam


[1]
<https://www.w3.org/blog/webauthn/2019/03/10/web-authentication-level-1-is-a-w3c-recommendation/>

[2] https://www.w3.org/TR/2019/REC-webauthn-1-20190304/

[3] Subject: New Version Notification for
draft-hodges-webauthn-registries-02.txt
To: Michael B. Jones <mbj@microsoft.com>;, Giridhar Mandyam
<mandyam@qti.qualcomm.com>;, Jeff Hodges <jdhodges@google.com>;
From: <internet-drafts@ietf.org>;
Date: Mon, Mar 11, 2019 at 7:44 PM

A new version of I-D, draft-hodges-webauthn-registries-02.txt
has been successfully submitted by Jeff Hodges and posted to the
IETF repository.

Name:           draft-hodges-webauthn-registries
Revision:       02
Title:          Registries for Web Authentication (WebAuthn)
Document date:  2019-03-11
Group:          Individual Submission
Pages:          7
URL:
<https://www.ietf.org/internet-drafts/draft-hodges-webauthn-registries-02.txt>
Status:
<https://datatracker.ietf.org/doc/draft-hodges-webauthn-registries/>
Htmlized:
<https://tools.ietf.org/html/draft-hodges-webauthn-registries-02>
Htmlized:
<https://datatracker.ietf.org/doc/html/draft-hodges-webauthn-registries>
Diff:
<https://www.ietf.org/rfcdiff?url2=draft-hodges-webauthn-registries-02>

Abstract:
     This specification defines IANA registries for W3C Web Authentication
     attestation statement format identifiers and extension identifiers.


The IETF Secretariat


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From: "Salz, Rich" <rsalz@akamai.com>
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From: "Salz, Rich" <rsalz@akamai.com>
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From: Joseph Lorenzo Hall <joe@cdt.org>
Date: Tue, 26 Mar 2019 05:27:52 -0400
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Subject: [Secdispatch] Fwd: descriptive censorship work: draft-hall-censorship-tech
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--00000000000019e5a90584fbf0c6
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as an FYI, thanks all!

---------- Forwarded message ---------
From: Joseph Lorenzo Hall <joe@cdt.org>
Date: Tue, Mar 26, 2019 at 4:45 AM
Subject: descriptive censorship work: draft-hall-censorship-tech
To: <pearg@irtf.org>, Stan Adams <sadams@cdt.org>, Nick Feamster <
feamster@cs.princeton.edu>


(Bcc'ing SECDISPATCH and SAAG as an FYI; thread on PEARG)

Hello, apologies for cross-posting.

At IETF 91 in 2014 we presented some very early work before SAAG that
describes how global censors use protocols to censor data flows (block,
impair, modify, etc.). After some editing in subsequent years based on
superb feedback from SAAG folks (Stephane B., Andrew M., thank you!) we had
tentative AD sponsorship and some thoughts that this was better on the IETF
side of the house rather than in a RG.

We've started to work on it again* and since the original draft we now have
SECDISPATCH to help "the misfit toys of security" find a home in terms of
IETF process... I very briefly described this work yesterday in SECDISPATCH
and Chris Wood, the new PEARG co-chair, suggested that PEARG would be a
good place for this work since part of what they would like to do in that
RG is document certain privacy-implicating things in the real world.

We don't really have a preference where this ends up -- there's even a case
to be made that given the dynamic nature of censorship that this will
necessarily always be a work in progress. We have heard people find it
useful and PEARG seems as good as anywhere, and obviously the process to
get to an RG RFC would help it get better (at least that is my impression!).

Here is the current version of the draft and the repo we're using to track
issues and version the doc:

draft: https://tools.ietf.org/html/draft-hall-censorship-tech-07
repo: https://github.com/josephlhall/rfc-censorship-tech

Would love to hear if this is something people think PEARG would like to
work on and we have some ideas about additional documents in a series like
this (e.g., having some real-world descriptive reference on research and
practice in terms of traffic analysis could be really useful for IETF
folks, I suspect.)

Cheers! --Joe Hall

(copying two co-authors, Stan from CDT and Nick from Princeton)

* IASA2 has been a big focus of my own for the last two years.

-- 
Joseph Lorenzo Hall
Chief Technologist, Center for Democracy & Technology [https://www.cdt.org]
1401 K ST NW STE 200, Washington DC 20005-3497
e: joe@cdt.org, p: 202.407.8825, pgp: https://josephhall.org/gpg-key
Fingerprint: 3CA2 8D7B 9F6D DBD3 4B10  1607 5F86 6987 40A9 A871

Don't miss out! CDT's Tech Prom is April 10, 2019, at The
Anthem. Please join us: https://cdt.org/annual-dinner/


-- 
Joseph Lorenzo Hall
Chief Technologist, Center for Democracy & Technology [https://www.cdt.org]
1401 K ST NW STE 200, Washington DC 20005-3497
e: joe@cdt.org, p: 202.407.8825, pgp: https://josephhall.org/gpg-key
Fingerprint: 3CA2 8D7B 9F6D DBD3 4B10  1607 5F86 6987 40A9 A871

Don't miss out! CDT's Tech Prom is April 10, 2019, at The
Anthem. Please join us: https://cdt.org/annual-dinner/

--00000000000019e5a90584fbf0c6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">as an FYI, thanks all!<br><div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">---------- Forwarded message ----=
-----<br>From: <b class=3D"gmail_sendername" dir=3D"auto">Joseph Lorenzo Ha=
ll</b> <span dir=3D"ltr">&lt;<a href=3D"mailto:joe@cdt.org">joe@cdt.org</a>=
&gt;</span><br>Date: Tue, Mar 26, 2019 at 4:45 AM<br>Subject: descriptive c=
ensorship work: draft-hall-censorship-tech<br>To:  &lt;<a href=3D"mailto:pe=
arg@irtf.org">pearg@irtf.org</a>&gt;, Stan Adams &lt;<a href=3D"mailto:sada=
ms@cdt.org">sadams@cdt.org</a>&gt;, Nick Feamster &lt;<a href=3D"mailto:fea=
mster@cs.princeton.edu">feamster@cs.princeton.edu</a>&gt;<br></div><br><br>=
<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>(Bcc&#39;ing SECDIS=
PATCH and SAAG as an FYI; thread on PEARG)<br></div><div><br></div><div>Hel=
lo, apologies for cross-posting.</div><div><br></div><div>At IETF 91 in 201=
4 we presented some very early work before SAAG that describes how global c=
ensors use protocols to censor data flows (block, impair, modify, etc.). Af=
ter some editing in subsequent years based on superb feedback from SAAG fol=
ks (Stephane B., Andrew M., thank you!) we had tentative AD sponsorship and=
 some thoughts that this was better on the IETF side of the house rather th=
an in a RG.<br></div><div><br></div><div>We&#39;ve started to work on it ag=
ain* and since the original draft we now have SECDISPATCH to help &quot;the=
 misfit toys of security&quot; find a home in terms of IETF process... I ve=
ry briefly described this work yesterday in SECDISPATCH and Chris Wood, the=
 new PEARG co-chair, suggested that PEARG would be a good place for this wo=
rk since part of what they would like to do in that RG is document certain =
privacy-implicating things in the real world.</div><div><br></div><div>We d=
on&#39;t really have a preference where this ends up -- there&#39;s even a =
case to be made that given the dynamic nature of censorship that this will =
necessarily always be a work in progress. We have heard people find it usef=
ul and PEARG seems as good as anywhere, and obviously the process to get to=
 an RG RFC would help it get better (at least that is my impression!).</div=
><div><br></div><div>Here is the current version of the draft and the repo =
we&#39;re using to track issues and version the doc:</div><div><br></div><d=
iv>draft: <a href=3D"https://tools.ietf.org/html/draft-hall-censorship-tech=
-07" target=3D"_blank">https://tools.ietf.org/html/draft-hall-censorship-te=
ch-07</a></div><div>repo: <a href=3D"https://github.com/josephlhall/rfc-cen=
sorship-tech" target=3D"_blank">https://github.com/josephlhall/rfc-censorsh=
ip-tech</a></div><div><br></div><div>Would love to hear if this is somethin=
g people think PEARG would like to work on and we have some ideas about add=
itional documents in a series like this (e.g., having some real-world descr=
iptive reference on research and practice in terms of traffic analysis coul=
d be really useful for IETF folks, I suspect.)</div><div><br></div><div>Che=
ers! --Joe Hall</div><div><br></div><div>(copying two co-authors, Stan from=
 CDT and Nick from Princeton)<br></div><div><br></div><div>* IASA2 has been=
 a big focus of my own for the last two years.<br></div><div><br>-- <br><di=
v dir=3D"ltr" class=3D"m_-7613754442102818437gmail_signature"><div dir=3D"l=
tr"><div><div dir=3D"ltr"><div>Joseph Lorenzo Hall<br>Chief Technologist, C=
enter for Democracy &amp; Technology [<a href=3D"https://www.cdt.org" targe=
t=3D"_blank">https://www.cdt.org</a>]<br>1401 K ST NW STE 200, Washington D=
C 20005-3497<br>e: <a href=3D"mailto:joe@cdt.org" target=3D"_blank">joe@cdt=
.org</a>, p: 202.407.8825, pgp: <a href=3D"https://josephhall.org/gpg-key" =
target=3D"_blank">https://josephhall.org/gpg-key</a><br>Fingerprint: 3CA2 8=
D7B 9F6D DBD3 4B10 =C2=A01607 5F86 6987 40A9 A871<br></div><div><br></div><=
div>Don&#39;t miss out! CDT&#39;s Tech Prom is April 10, 2019, at The<br>An=
them. Please join us: <a href=3D"https://cdt.org/annual-dinner/" target=3D"=
_blank">https://cdt.org/annual-dinner/</a><br></div></div></div></div></div=
></div></div></div></div>
</div><br clear=3D"all"><br>-- <br><div dir=3D"ltr" class=3D"gmail_signatur=
e" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr=
"><div>Joseph Lorenzo Hall<br>Chief Technologist, Center for Democracy &amp=
; Technology [<a href=3D"https://www.cdt.org" target=3D"_blank">https://www=
.cdt.org</a>]<br>1401 K ST NW STE 200, Washington DC 20005-3497<br>e: <a hr=
ef=3D"mailto:joe@cdt.org" target=3D"_blank">joe@cdt.org</a>, p: 202.407.882=
5, pgp: <a href=3D"https://josephhall.org/gpg-key" target=3D"_blank">https:=
//josephhall.org/gpg-key</a><br>Fingerprint: 3CA2 8D7B 9F6D DBD3 4B10 =C2=
=A01607 5F86 6987 40A9 A871<br></div><div><br></div><div>Don&#39;t miss out=
! CDT&#39;s Tech Prom is April 10, 2019, at The<br>Anthem. Please join us: =
<a href=3D"https://cdt.org/annual-dinner/" target=3D"_blank">https://cdt.or=
g/annual-dinner/</a><br></div></div></div></div></div></div></div>

--00000000000019e5a90584fbf0c6--


From nobody Tue Mar 26 02:58:46 2019
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Comments: In-reply-to "Salz, Rich" <rsalz@akamai.com> message dated "Tue, 26 Mar 2019 08:35:54 +0000."
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Subject: Re: [Secdispatch] [saag] SECDISPATCH WG Summary from IETF 104
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Salz, Rich <rsalz@akamai.com> wrote:
    >> I noticed at the last dispatch that there has been no humming to get
    >> the
    >     feeling of the room

    > Good point, thanks for raising the issue. We also missed "to be
    > confirmed on the list."  Whatever the rules are going to be, they
    > should be explicit.

Which list? :-)
no, seriously.  I think that each propsal needs some CCs to other lists.

Also, I would have thought that the virtual interim meeting results would
have been included in that summary email as well.

I'd like to see a paragraph for each proposal explaining why other options
(including "not relevant to IETF", or also, "conflicts with existing work")
are less relevant.  As such each really needs it's own thread.
Yes, that is more work... "many hands" comes to mind.

=2D-=20
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -=3D IPv6 IoT consulting =3D-




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From nobody Tue Mar 26 03:21:39 2019
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Subject: Re: [Secdispatch] review request: draft-hodges-webauthn-registries-02
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> >    Anyway, are there any objections to Ben AD-sponsoring
       `draft-hodges-webauthn-registries` ?

> This is such an obvious no-brainer that I wonder if you're just not  
> seeking attention :)


Well, Ben asked us to send that inquiry message.

Seems to me he/us have our answer ;-)

thanks,

=JeffH

ps: review of draft-hodges-webauthn-registries remains welcome of course...




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Subject: Re: [Secdispatch] [saag] SECDISPATCH WG Summary from IETF 104
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> -----Original Message-----
> From: Secdispatch [mailto:secdispatch-bounces@ietf.org] On Behalf Of
> Michael Richardson
> Sent: Tuesday, March 26, 2019 5:59 AM
> To: saag@ietf.org; secdispatch@ietf.org
> Subject: Re: [Secdispatch] [saag] SECDISPATCH WG Summary from IETF 104
>=20
>=20
> Salz, Rich <rsalz@akamai.com> wrote:
>     >> I noticed at the last dispatch that there has been no humming to g=
et
>     >> the
>     >     feeling of the room
>=20
>     > Good point, thanks for raising the issue. We also missed "to be
>     > confirmed on the list."  Whatever the rules are going to be, they
>     > should be explicit.

I strongly concur that we need to be consistent and explicit about the proc=
ess. =20

Across the meetings, we have been inconsistent on when hums are taken vs. s=
ummarizing feedback from the mic line -- it has been a judgement call on as=
sessing consensus from the front table.

Where the process has been consistent across meetings is in NOT taking any =
confirmations to the list.  Dispatch decisions have been a point in time ac=
tivity during a meeting based on the participants in the room or virtually =
participating.  The motivation for this approach was to convene a discrete =
event that provides immediate feedback on next steps to the draft authors. =
 The charter does allow for the WG "... com[ing] to a prompt resolution of =
the appropriate disposition of each proposal ... on the mailing list".

> Which list? :-)
> no, seriously.  I think that each propsal needs some CCs to other lists.

I'm not sure what hard rule to apply on a per draft basis for post-dispatch=
 notifications.  However, pre-dispatch, continued coordination with ART dis=
patch process (and other areas) remains top of mind too.

> Also, I would have thought that the virtual interim meeting results would
> have been included in that summary email as well.

(for SAAG) A pointer to the summary of the virtual interim meeting on 03/05=
/2019:=20
https://mailarchive.ietf.org/arch/msg/secdispatch/9AfqrecZfFMlMGxSXOo4ENZtr=
Vk

> I'd like to see a paragraph for each proposal explaining why other option=
s
> (including "not relevant to IETF", or also, "conflicts with existing work=
") are
> less relevant.  As such each really needs it's own thread.
> Yes, that is more work... "many hands" comes to mind.

The summaries are intentionally terse as they are trying to share the resul=
ts of the dispatch as soon as possible.  More details will ultimately be pu=
blished in the minutes and ground truth remains in the recording.  I worry =
on how to deliberate after the dispatch meeting but provide prompt resoluti=
on.

Roman

> --
> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
> -=3D IPv6 IoT consulting =3D-
>
>=20


From nobody Tue Mar 26 11:26:14 2019
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Date: Tue, 26 Mar 2019 12:25:56 -0600
From: David Fifield <david@bamsoftware.com>
To: Dmitry Belyavsky <beldmit@gmail.com>
Cc: TLS Mailing List <tls@ietf.org>, secdispatch@ietf.org
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Subject: Re: [Secdispatch] [TLS] Fwd: New Version Notification for draft-belyavskiy-fakesni-00.txt
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On Tue, Feb 19, 2019 at 11:04:06PM +0300, Dmitry Belyavsky wrote:
> Please take a look at an initial submission of the draft.
> The draft describes a Fake SNI mechanism intended to cheat DPI systems in
> a case 
> when a DPI system blocks the connection if ESNI is present.
> 
> ---------- Forwarded message ---------
> From: <internet-drafts@ietf.org>
> Date: Tue, Feb 19, 2019 at 10:43 PM
> Subject: New Version Notification for draft-belyavskiy-fakesni-00.txt
> To: Dmitry Belyavskiy <beldmit@gmail.com>
> 
> Abstract:
>    The document provides a specification of the Fake Server Name
>    Indication.  Being implemented, the Fake SNI specification provides a
>    way to work around the monitoring solutions without providing any
>    additional information to external observers.

I initially viewed this proposal negatively, but after thinking about it
more during Dmitry's talk today (https://datatracker.ietf.org/meeting/104/materials/slides-104-tls-slides-ietf104-tls-fake-sni-00),
I think there are ways in which it can make sense.

The reason I initially viewed it negatively was that it seemed to be a
naive attempt at addressing the "proxy distribution" problem--where you
have to somehow share secret information with your genuine users but not
let it fall into the hands of an adversary, with the challenge that you
don't have a secure way to distinguish genuine users from an adversary.
The draft acknowledges the challenge but, I think, treats it too
lightly, as for me it is the core consideration: "DPI solutions are able
to obtain the DNS _fakesni records as legitimate clients do." It's the
same problem you would face if you were to establish mirror sites to
mitigate blocking: how do you inform your users of the mirror sites'
URLs without also informing the adversary you're protecting against?
Another way way to think about it is: you have a large set of secret
tokens, and you want it so that *anyone* can discover one token, but
*no one* can discover all the tokens.

There's a fair amount of research on secure proxy distribution, but they
all work by imposing limits on the adversary, by leveraging trust
relationships among genuine users, tying discovery to real-world
resources, or some other method. Here is a selection of research:
	https://censorbib.nymity.ch/#Nasr2019a
	https://censorbib.nymity.ch/#Douglas2016a
	https://censorbib.nymity.ch/#Wang2013a
	https://censorbib.nymity.ch/#McCoy2011a
The Fake SNI draft's DNS discovery doesn't impose any significant
limits, so if there is only one or a few fake SNIs, I think the idea
won't work against an adversary that can afford to do continuous
polling, even if the set of fake SNIs is rotated frequently.

But if you ensure that each fake SNI value is distributed once and only
once, then I think the idea has some merit. Then, it doesn't help an
adversary to do its own polling, because any SNIs it discovers will
never be used by a legitimate client. It doesn't help if it blocks SNI
values that clients have been seen to use, because those values will not
be used again.

This all assumes trustworthy DNS, so an adversary can't see the SNI
you're about to use before you use it. And it also assumes some level of
colocation, or else there is nothing to prevent an intermediary from
blocking the IP address regardless of SNI. (The same observations apply
to ESNI as well as Fake SNI.)

However, even with one-time-use fake SNI values, the design still has a
problem with replay. The generic attack is described at
https://tools.ietf.org/html/draft-ietf-tls-sni-encryption-04#section-3.1.
The adversary observes a client using an SNI value, then makes its own
connection to the same server using the same SNI value. Now the
adversary knows what particular colocated service on the server the
client is accessing, and even if it cannot block the server entirely
(because of colocation), it can terminate that client's specific
connection. Perhaps the server can check for and reject reused fake SNI
values--but then it also needs to be the case that all (or at least
many) of the users of the server's colocated services use Fake SNI, not
just the ones who are trying to access the services the adversary would
like to block, or else you violate the "Do not stick out" criterion.


From nobody Tue Mar 26 12:22:54 2019
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Date: Tue, 26 Mar 2019 14:22:43 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: "Salz, Rich" <rsalz@akamai.com>
Cc: "jeff.hodges@kingsmountain.com" <jeff.hodges@kingsmountain.com>, "secdispatch@ietf.org" <secdispatch@ietf.org>
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Subject: Re: [Secdispatch] review request: draft-hodges-webauthn-registries-02
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On Tue, Mar 26, 2019 at 08:33:55AM +0000, Salz, Rich wrote:
> >    Anyway, are there any objections to Ben AD-sponsoring  
>     `draft-hodges-webauthn-registries` ?
>   
> This is such an obvious no-brainer that I wonder if you're just not seeking attention :)

I asked Jeff to ask about it here; I try not to think I'm infallible and
appreciate the extra impartial eyes, especially when it's a "no-brainer" :)

-Ben


From nobody Thu Mar 28 03:32:18 2019
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From: Roman Danyliw <rdd@cert.org>
To: "secdispatch@ietf.org" <secdispatch@ietf.org>
Thread-Topic: EDHOC Summary
Thread-Index: AdTlTpiwSQddzTDHR8ys25qjhhiyAA==
Date: Thu, 28 Mar 2019 10:32:01 +0000
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Subject: [Secdispatch] EDHOC Summary
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Hi!

We have observed the continued discussion and interest in the topics discus=
sed at the March 2019 Virtual Interim Secdispatch meeting [1].  Our assessm=
ent of the current state of this discuss and as well as proposed next steps=
 are below.

Regards,
Roman and Ben

[1] https://mailarchive.ietf.org/arch/msg/secdispatch/9AfqrecZfFMlMGxSXOo4E=
NZtrVk

=3D=3D[ Summary of ADs ]=3D=3D
EDHOC Summary

-----[ 1. What is the problem we are faced with?
=20
The community needs an AKE that is 'lightweight' (per slide #3 of [2]) and =
enables forward security for constrained environments using OSCORE [13].  '=
Lightweight' refers to:
=20
** resource consumption, measured by bytes on the wire, wall-clock time to =
complete (i.e., the initial latency added to application protocols by the A=
KE), or power (per slide #12 of [2])
** the amount of new code required on end systems which already have an OSC=
ORE stack [4]=20
=20
-----[ 2. Is the problem understood and narrowly scoped?

Use with OSCORE implicitly assumes that this AKE would support:
** transport over CoAP, and
** COSE algorithms

The specific constrained environments that we are considering use NB-IoT, 6=
TiSCH, and LoRaWAN.  The desire is to optimize the AKE to be 'as [small] ..=
. as reasonably achievable' (per [3]) in these environments.

** With respect to 6TiSCH, IETF consensus on the 6TiSCH WG charter has alre=
ady identified the need to "secur[e] the join process and mak[e] that fit w=
ithin the constraints of high latency, low throughput and small frame sizes=
 that characterize IEEE802.15.4 TSCH." [12].
** With respect to NB-IoT and LoRaWAN, IETF consensus on the LPWAN WG chart=
er has identified the need to improve the transport capabilities of LPWA ne=
tworks such as NB-IoT and LoRa whose "common traits include ... frame sizes=
 ... [on] the order of tens of bytes transmitted a few times per day at ult=
ra-low speeds" [16]. This indicates IETF interest in supporting these radio=
 environments, though no security-specific requirements are included in the=
 charter.
=20
It may be necessary to evaluate options that make different trade-offs acro=
ss a number of dimensions.
=20
** Per 'bytes on the wire', it is desirable for these AKE messages to fit i=
nto the MTU size of these protocols; and if not possible, within as few fra=
mes as possible.  Note that using multiple MTUs can have significant costs =
in terms of time and power (listed below). For 6TiSCH specifically, as a ti=
me-sliced network, this metric (or rather, the quantization into frame coun=
t) is particularly noteworthy, since more frames contribute  to congestion =
for spectrum (and concomitant error rates) in a non-linear way, especially =
in scenarios when large numbers of independent nodes are attempting to exec=
ute an AKE to join a network.
=20
** Per 'time', it is desirable for the AKE message exchange(s) to complete =
in a reasonable amount of time, both for a single uncongested exchange and =
when multiple exchanges are running in an interleaved fashion.  This latenc=
y may not be a linear function depending on congestion and the specific rad=
io technology used.  For LoRaWAN, which is legally required to use a 1% (or=
 smaller) duty cycle, a payload split into two fragments instead of one inc=
reases the time to complete the sending of this payload by 10,000% (per sli=
de #10 of [2]). =20
=20
** Per 'power', it is desirable for the transmission of AKE messages and cr=
ypto to draw as little power as possible  The best mechanism for doing so d=
iffers across radio technologies.  For example, NB-IoT uses licensed spectr=
um and thus can transmit at higher power to improve coverage, making the tr=
ansmitted byte count relatively more important than for other radio technol=
ogies.  In other cases, the radio transmitter will be active for a full MTU=
 frame regardless of how much of the frame is occupied by message content, =
which makes the byte count less sensitive for the power consumption.  Incre=
ased power consumption is unavoidable in poor network conditions, such as m=
ost wide-area settings including LoRaWAN.

** Per 'new code', it is desirable to introduce as little new code as possi=
ble onto OSCORE-enabled devices to support this new AKE.  These devices hav=
e on the order of 10s of kB of memory and 100s of kB of storage on which an=
 embedded OS; a COAP stack; CORE and AKE libraries; and target applications=
 would run.  It is expected that the majority of this space is  available f=
or actual application logic, as opposed to the support libraries.

A key question to answer is whether any new solution will reduce these prop=
erties to a sufficient extent to merit investment.
=20
-----[ 3. Do we believe it is possible to engineer a solution?

EDHOC [1] appears to be an existence proof that it is possible to produce a=
n AKE that meaningfully reduces the costs across at least two dimensions id=
entified in question #1 and 2 (bytes and time). =20

EDHOC appears to favorably outperform TLS/CoAP, the current technology, rel=
ative to these dimensions.=20
=20
** Per 'bytes on the wire', MTU sizes and their alignment to the size of me=
ssages of EDHOC vs. TLS/CoAP can be found in slide #33 of [2], and in [5]. =
 Additional details for 6TiSCH in particular can be found in slide 36-37 of=
 [2].
=20
** Per 'time', the latency due to back-off time estimates with EDHOC vs. TL=
S/CoAP using LoRaWAN can be found in slide #39 of [2]
=20
** Per 'power', estimates of the power usage of EDHOC vs TLS/CoAP using NB-=
IoT can be found in slide #35 of [2]=20
=20
** Per 'new code', being able to reuse primitives from the existing COSE st=
ack is expected to benefit the code size for EDHOC, but no hard data is yet=
 available for comparison. =20

Exploratory work with cTLS [10] and femtoTLS [11] has suggested that certai=
n optimizations used in EDHOC can also be applied to a TLS/CoAP-variant.  H=
ow this impacts the original assumptions and security analysis for (D)TLS i=
s unknown.=20
=20
-----[ 4. Is this particular proposal a good basis for working on?=20

EDHOC shows gains in defining an AKE with forward secrecy that is 'reasonab=
ly small[er]' than the baseline of (D)TLS.  Specifically, it appears that E=
DHOC would enable:
** for 6TiSCH, a more efficient network join operation, with network join t=
raffic fitting in one frame per flight (that is, the optimal possible behav=
ior) in up to a 5-hop network [17]
** for LoRaWAN, an AKE with forward secrecy that avoids the unacceptable ba=
ckoff-induced latency=20

A limited interop was performed on draft-selander-ace-cose-ecdhe-05 (EDHOC)=
 at IETF 98 between [14] and [15].  Despite the inherent challenges of prod=
ucing a new AKE that is secure, there is reason to have confidence in the s=
ecurity claims made by EDHOC -- the security properties of -08 were formall=
y verified by [8][9].  Identified issues from this formal analysis [8] were=
 addressed in -11.  The CFRG crypto review panel conducted two reviews [6][=
7].  These reviews confirmed that the security claims are reasonable, attes=
ted that the identified issues found in the formal analysis [8] were fixed,=
 and provided additional recommendations.
=20
Re-encoding of the TLS handshake as suggested by cTLS [10] may be possible.=
  However, as of yet, cTLS is an incomplete specification, cTLS has no form=
al security analysis, and is technically a new protocol.

-----[ Conclusion

There appears to be an understood and scoped problem that is feasible to en=
gineer.  Among the available starting points to address the problem defined=
 in question #1, EDHOC presents a viable choice. =20

Chartering a narrowly scoped, short-lived WG in this space with EDHOC as a =
starting point seems to be an attractive path forward, but we would like to=
 receive community feedback on the degree of support for this approach.

-----[ References
[1] https://www.ietf.org/id/draft-selander-ace-cose-ecdhe-13.txt
[2] https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/materi=
als/slides-interim-2019-secdispatch-01-sessa-edhoc.pdf
[3] https://mailarchive.ietf.org/arch/msg/secdispatch/-GPqswnS-DRvrAKsPbdoe=
s4Y4lE
[4] https://mailarchive.ietf.org/arch/msg/secdispatch/rJqvstLHo7aLfu-ODril-=
wIVn_0
[5] https://docs.google.com/document/d/1wLoIexMLG3U9iYO5hzGzKjkvi-VDndQBbYR=
NsMUlh-k
[6] https://mailarchive.ietf.org/arch/msg/cfrg/6WN2C2RYGTIAInE2jIUco6L9pO8
[7] https://mailarchive.ietf.org/arch/msg/cfrg/2OY2om1FjhNNBmUzwYJroHv7eWQ
[8] https://alessandrobruni.name/papers/18-edhoc.pdf
[9] https://github.com/theisgroenbech/edhoc-proverif
[10] https://tools.ietf.org/html/draft-rescorla-tls-ctls-01
[11] https://github.com/bifurcation/mint/compare/ftls
[12] https://datatracker.ietf.org/doc/charter-ietf-6tisch/
[13] https://datatracker.ietf.org/doc/draft-ietf-core-object-security/
[14] https://github.com/alexkrontiris/EDHOC-C
[15] https://github.com/jimsch/EDHOC-csharp
[16] https://datatracker.ietf.org/doc/charter-ietf-lpwan/
[17] https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zerotouc=
h-join

=3D=3D[ End ]=3D=3D


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From: Jim Schaad <ietf@augustcellars.com>
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Subject: Re: [Secdispatch] EDHOC Summary
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I am strongly in agreement with doing this.

> -----Original Message-----
> From: Secdispatch <secdispatch-bounces@ietf.org> On Behalf Of Roman
> Danyliw
> Sent: Thursday, March 28, 2019 11:32 AM
> To: secdispatch@ietf.org
> Subject: [Secdispatch] EDHOC Summary
> 
> Hi!
> 
> We have observed the continued discussion and interest in the topics
> discussed at the March 2019 Virtual Interim Secdispatch meeting [1].  Our
> assessment of the current state of this discuss and as well as proposed
next
> steps are below.
> 
> Regards,
> Roman and Ben
> 
> [1]
> https://mailarchive.ietf.org/arch/msg/secdispatch/9AfqrecZfFMlMGxSXOo4
> ENZtrVk
> 
> ==[ Summary of ADs ]==
> EDHOC Summary
> 
> -----[ 1. What is the problem we are faced with?
> 
> The community needs an AKE that is 'lightweight' (per slide #3 of [2]) and
> enables forward security for constrained environments using OSCORE [13].
> 'Lightweight' refers to:
> 
> ** resource consumption, measured by bytes on the wire, wall-clock time to
> complete (i.e., the initial latency added to application protocols by the
AKE),
> or power (per slide #12 of [2])
> ** the amount of new code required on end systems which already have an
> OSCORE stack [4]
> 
> -----[ 2. Is the problem understood and narrowly scoped?
> 
> Use with OSCORE implicitly assumes that this AKE would support:
> ** transport over CoAP, and
> ** COSE algorithms
> 
> The specific constrained environments that we are considering use NB-IoT,
> 6TiSCH, and LoRaWAN.  The desire is to optimize the AKE to be 'as [small]
...
> as reasonably achievable' (per [3]) in these environments.
> 
> ** With respect to 6TiSCH, IETF consensus on the 6TiSCH WG charter has
> already identified the need to "secur[e] the join process and mak[e] that
fit
> within the constraints of high latency, low throughput and small frame
sizes
> that characterize IEEE802.15.4 TSCH." [12].
> ** With respect to NB-IoT and LoRaWAN, IETF consensus on the LPWAN WG
> charter has identified the need to improve the transport capabilities of
LPWA
> networks such as NB-IoT and LoRa whose "common traits include ... frame
> sizes ... [on] the order of tens of bytes transmitted a few times per day
at
> ultra-low speeds" [16]. This indicates IETF interest in supporting these
radio
> environments, though no security-specific requirements are included in the
> charter.
> 
> It may be necessary to evaluate options that make different trade-offs
> across a number of dimensions.
> 
> ** Per 'bytes on the wire', it is desirable for these AKE messages to fit
into
> the MTU size of these protocols; and if not possible, within as few frames
as
> possible.  Note that using multiple MTUs can have significant costs in
terms of
> time and power (listed below). For 6TiSCH specifically, as a time-sliced
> network, this metric (or rather, the quantization into frame count) is
> particularly noteworthy, since more frames contribute  to congestion for
> spectrum (and concomitant error rates) in a non-linear way, especially in
> scenarios when large numbers of independent nodes are attempting to
> execute an AKE to join a network.
> 
> ** Per 'time', it is desirable for the AKE message exchange(s) to complete
in
> a reasonable amount of time, both for a single uncongested exchange and
> when multiple exchanges are running in an interleaved fashion.  This
latency
> may not be a linear function depending on congestion and the specific
radio
> technology used.  For LoRaWAN, which is legally required to use a 1% (or
> smaller) duty cycle, a payload split into two fragments instead of one
> increases the time to complete the sending of this payload by 10,000% (per
> slide #10 of [2]).
> 
> ** Per 'power', it is desirable for the transmission of AKE messages and
> crypto to draw as little power as possible  The best mechanism for doing
so
> differs across radio technologies.  For example, NB-IoT uses licensed
> spectrum and thus can transmit at higher power to improve coverage,
> making the transmitted byte count relatively more important than for other
> radio technologies.  In other cases, the radio transmitter will be active
for a
> full MTU frame regardless of how much of the frame is occupied by message
> content, which makes the byte count less sensitive for the power
> consumption.  Increased power consumption is unavoidable in poor network
> conditions, such as most wide-area settings including LoRaWAN.
> 
> ** Per 'new code', it is desirable to introduce as little new code as
possible
> onto OSCORE-enabled devices to support this new AKE.  These devices have
> on the order of 10s of kB of memory and 100s of kB of storage on which an
> embedded OS; a COAP stack; CORE and AKE libraries; and target applications
> would run.  It is expected that the majority of this space is  available
for actual
> application logic, as opposed to the support libraries.
> 
> A key question to answer is whether any new solution will reduce these
> properties to a sufficient extent to merit investment.
> 
> -----[ 3. Do we believe it is possible to engineer a solution?
> 
> EDHOC [1] appears to be an existence proof that it is possible to produce
an
> AKE that meaningfully reduces the costs across at least two dimensions
> identified in question #1 and 2 (bytes and time).
> 
> EDHOC appears to favorably outperform TLS/CoAP, the current technology,
> relative to these dimensions.
> 
> ** Per 'bytes on the wire', MTU sizes and their alignment to the size of
> messages of EDHOC vs. TLS/CoAP can be found in slide #33 of [2], and in
[5].
> Additional details for 6TiSCH in particular can be found in slide 36-37 of
[2].
> 
> ** Per 'time', the latency due to back-off time estimates with EDHOC vs.
> TLS/CoAP using LoRaWAN can be found in slide #39 of [2]
> 
> ** Per 'power', estimates of the power usage of EDHOC vs TLS/CoAP using
> NB-IoT can be found in slide #35 of [2]
> 
> ** Per 'new code', being able to reuse primitives from the existing COSE
> stack is expected to benefit the code size for EDHOC, but no hard data is
yet
> available for comparison.
> 
> Exploratory work with cTLS [10] and femtoTLS [11] has suggested that
certain
> optimizations used in EDHOC can also be applied to a TLS/CoAP-variant.
How
> this impacts the original assumptions and security analysis for (D)TLS is
> unknown.
> 
> -----[ 4. Is this particular proposal a good basis for working on?
> 
> EDHOC shows gains in defining an AKE with forward secrecy that is
> 'reasonably small[er]' than the baseline of (D)TLS.  Specifically, it
appears that
> EDHOC would enable:
> ** for 6TiSCH, a more efficient network join operation, with network join
> traffic fitting in one frame per flight (that is, the optimal possible
behavior) in
> up to a 5-hop network [17]
> ** for LoRaWAN, an AKE with forward secrecy that avoids the unacceptable
> backoff-induced latency
> 
> A limited interop was performed on draft-selander-ace-cose-ecdhe-05
> (EDHOC) at IETF 98 between [14] and [15].  Despite the inherent challenges
> of producing a new AKE that is secure, there is reason to have confidence
in
> the security claims made by EDHOC -- the security properties of -08 were
> formally verified by [8][9].  Identified issues from this formal analysis
[8]
> were addressed in -11.  The CFRG crypto review panel conducted two
> reviews [6][7].  These reviews confirmed that the security claims are
> reasonable, attested that the identified issues found in the formal
analysis
> [8] were fixed, and provided additional recommendations.
> 
> Re-encoding of the TLS handshake as suggested by cTLS [10] may be
> possible.  However, as of yet, cTLS is an incomplete specification, cTLS
has no
> formal security analysis, and is technically a new protocol.
> 
> -----[ Conclusion
> 
> There appears to be an understood and scoped problem that is feasible to
> engineer.  Among the available starting points to address the problem
> defined in question #1, EDHOC presents a viable choice.
> 
> Chartering a narrowly scoped, short-lived WG in this space with EDHOC as a
> starting point seems to be an attractive path forward, but we would like
to
> receive community feedback on the degree of support for this approach.
> 
> -----[ References
> [1] https://www.ietf.org/id/draft-selander-ace-cose-ecdhe-13.txt
> [2] https://datatracker.ietf.org/meeting/interim-2019-secdispatch-
> 01/materials/slides-interim-2019-secdispatch-01-sessa-edhoc.pdf
> [3] https://mailarchive.ietf.org/arch/msg/secdispatch/-GPqswnS-
> DRvrAKsPbdoes4Y4lE
> [4]
https://mailarchive.ietf.org/arch/msg/secdispatch/rJqvstLHo7aLfu-ODril-
> wIVn_0
> [5] https://docs.google.com/document/d/1wLoIexMLG3U9iYO5hzGzKjkvi-
> VDndQBbYRNsMUlh-k
> [6]
> https://mailarchive.ietf.org/arch/msg/cfrg/6WN2C2RYGTIAInE2jIUco6L9pO8
> [7]
> https://mailarchive.ietf.org/arch/msg/cfrg/2OY2om1FjhNNBmUzwYJroHv7e
> WQ
> [8] https://alessandrobruni.name/papers/18-edhoc.pdf
> [9] https://github.com/theisgroenbech/edhoc-proverif
> [10] https://tools.ietf.org/html/draft-rescorla-tls-ctls-01
> [11] https://github.com/bifurcation/mint/compare/ftls
> [12] https://datatracker.ietf.org/doc/charter-ietf-6tisch/
> [13] https://datatracker.ietf.org/doc/draft-ietf-core-object-security/
> [14] https://github.com/alexkrontiris/EDHOC-C
> [15] https://github.com/jimsch/EDHOC-csharp
> [16] https://datatracker.ietf.org/doc/charter-ietf-lpwan/
> [17]
https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zerotouch-
> join
> 
> ==[ End ]==
> 
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch


From nobody Thu Mar 28 09:26:08 2019
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Comments: In-reply-to Jim Schaad <ietf@augustcellars.com> message dated "Thu, 28 Mar 2019 12:36:57 +0100."
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--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable


Jim Schaad <ietf@augustcellars.com> wrote:
    > I am strongly in agreement with doing this.

...
    >> Chartering a narrowly scoped, short-lived WG in this space with EDHOC
    >> as a starting point seems to be an attractive path forward, but we
    >> would like to
    >> receive community feedback on the degree of support for this approac=
h.

I believe that that our experience with narrowly scoped short-lived WGs has
been poor.  I can't think of a positive, or really, any example.
I would dearly like this to not be the case... so maybe we can do better.
Maybe there is some RFC3999 we can try here.

I would propose (and will volunteer, unless you'd rather do this to yourself
Roman) to ask some past IESG chairs (Russ, Jari) about when we have done th=
is
in the past, and then find out from relevant (past?) ADs if there are lesso=
ns
to be learned.

=2D-=20
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -=3D IPv6 IoT consulting =3D-




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From: Alexey Melnikov <alexey.melnikov@isode.com>
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Subject: Re: [Secdispatch] EDHOC Summary
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Hi Michael,

On 28 Mar 2019, at 17:25, Michael Richardson <mcr+ietf@sandelman.ca> wrote:

>>> Chartering a narrowly scoped, short-lived WG in this space with EDHOC
>>> as a starting point seems to be an attractive path forward, but we
>>> would like to
>>> receive community feedback on the degree of support for this approach.
>=20
> I believe that that our experience with narrowly scoped short-lived WGs ha=
s
> been poor.  I can't think of a positive, or really, any example.
> I would dearly like this to not be the case... so maybe we can do better.
> Maybe there is some RFC3999 we can try here.

This can vary by area, but we had several examples in ART, with a single doc=
ument deliverable. One example is IMAPMOVE.

Best Regards,
Alexey=


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> -----Original Message-----
> From: Secdispatch <secdispatch-bounces@ietf.org> On Behalf Of Michael
> Richardson
> Sent: Thursday, March 28, 2019 5:25 PM
> To: secdispatch@ietf.org
> Subject: Re: [Secdispatch] EDHOC Summary
> 
> 
> Jim Schaad <ietf@augustcellars.com> wrote:
>     > I am strongly in agreement with doing this.
> 
> ....
>     >> Chartering a narrowly scoped, short-lived WG in this space with
EDHOC
>     >> as a starting point seems to be an attractive path forward, but we
>     >> would like to
>     >> receive community feedback on the degree of support for this
> approach.
> 
> I believe that that our experience with narrowly scoped short-lived WGs
has
> been poor.  I can't think of a positive, or really, any example.
> I would dearly like this to not be the case... so maybe we can do better.
> Maybe there is some RFC3999 we can try here.

I managed to get the first round of COSE done in 15 months

Jim

> 
> I would propose (and will volunteer, unless you'd rather do this to
yourself
> Roman) to ask some past IESG chairs (Russ, Jari) about when we have done
> this in the past, and then find out from relevant (past?) ADs if there are
> lessons to be learned.
> 
> --
> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
> -= IPv6 IoT consulting =-
> 
> 



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From: "Salz, Rich" <rsalz@akamai.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>, "secdispatch@ietf.org" <secdispatch@ietf.org>
Thread-Topic: [Secdispatch] EDHOC Summary
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To: John Mattsson <john.mattsson@ericsson.com>
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+1

Sent from my mobile device

> On Mar 29, 2019, at 8:13 AM, John Mattsson <john.mattsson@ericsson.com> wr=
ote:
>=20
> +1
>=20
> Jim Schaad <ietf@augustcellars.com>; wrote:
>=20
>> I am strongly in agreement with doing this.
>=20
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch


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--=-=-=
Content-Type: text/plain
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    >>>> Chartering a narrowly scoped, short-lived WG in this space with
    >>>> EDHOC as a starting point seems to be an attractive path forward,
    >>>> but we would like to receive community feedback on the degree of
    >>>> support for this approach.
    >>=20
    >> I believe that that our experience with narrowly scoped short-lived
    >> WGs has been poor.  I can't think of a positive, or really, any
    >> example.  I would dearly like this to not be the case... so maybe we
    >> can do better.  Maybe there is some RFC3999 we can try here.

    > This can vary by area, but we had several examples in ART, with a
    > single document deliverable. One example is IMAPMOVE.

That's very good to hear.
I've never heard of IMAPMOVE, which means it ran short enough that I didn't
notice it :-)
How do we repeat that kind of success?

=2D-=20
]               Never tell me the odds!                 | ipv6 mesh network=
s [=20
]   Michael Richardson, Sandelman Software Works        | network architect=
  [=20
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails  =
  [=20
=09

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From nobody Fri Mar 29 00:58:20 2019
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From: Antonio Skarmeta <skarmeta@um.es>
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+1

El 29/03/2019 a las 8:13, John Mattsson escribió:
> +1
>
> Jim Schaad <ietf@augustcellars.com>; wrote:
>
>      > I am strongly in agreement with doing this.
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch

-- 
------------------------------------------------------------
Antonio F. Skarmeta Gómez
Dept. Ingeniería de la Información y las Comunicaciones
Facultad de Informática
Universidad de Murcia
30100 Murcia
e-mail: skarmeta@um.es
Telf: +34-868-884607
fax: +34-868-884151


---
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From nobody Fri Mar 29 00:59:18 2019
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+1

On 29/03/2019 08:58, Antonio Skarmeta wrote:
> +1
>
> El 29/03/2019 a las 8:13, John Mattsson escribi=C3=B3:
>> +1
>>
>> Jim Schaad <ietf@augustcellars.com>; wrote:
>>
>> =C2=A0=C2=A0=C2=A0=C2=A0 > I am strongly in agreement with doing this.
>>
>> _______________________________________________
>> Secdispatch mailing list
>> Secdispatch@ietf.org
>> https://www.ietf.org/mailman/listinfo/secdispatch
>


From nobody Fri Mar 29 01:05:26 2019
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On Fri, Mar 29, 2019 at 08:56:19AM +0100, Michael Richardson wrote:
> 
>     >>>> Chartering a narrowly scoped, short-lived WG in this space with
>     >>>> EDHOC as a starting point seems to be an attractive path forward,
>     >>>> but we would like to receive community feedback on the degree of
>     >>>> support for this approach.
>     >> 
>     >> I believe that that our experience with narrowly scoped short-lived
>     >> WGs has been poor.  I can't think of a positive, or really, any
>     >> example.  I would dearly like this to not be the case... so maybe we
>     >> can do better.  Maybe there is some RFC3999 we can try here.
> 
>     > This can vary by area, but we had several examples in ART, with a
>     > single document deliverable. One example is IMAPMOVE.
> 
> That's very good to hear.
> I've never heard of IMAPMOVE, which means it ran short enough that I didn't
> notice it :-)
> How do we repeat that kind of success?

A focused set of participants and WG chairs that actively push to keep the
pace up.

-Ben


From nobody Fri Mar 29 01:11:42 2019
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From: DAN GARCIA CARRILLO <dan.garcia@um.es>
To: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Cc: John Mattsson <john.mattsson@ericsson.com>, secdispatch@ietf.org
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Subject: Re: [Secdispatch] EDHOC Summary
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+ 1
Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com> escribi=C3=B3:

> +1
>
> Sent from my mobile device
>
>> On Mar 29, 2019, at 8:13 AM, John Mattsson=20=20
>>=20<john.mattsson@ericsson.com> wrote:
>>
>> +1
>>
>> Jim Schaad <ietf@augustcellars.com>; wrote:
>>
>>> I am strongly in agreement with doing this.
>>
>> _______________________________________________
>> Secdispatch mailing list
>> Secdispatch@ietf.org
>> https://www.ietf.org/mailman/listinfo/secdispatch
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch




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Subject: Re: [Secdispatch] EDHOC Summary
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
To: Roman Danyliw <rdd@cert.org>, "secdispatch@ietf.org"
 <secdispatch@ietf.org>
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Hiya,

FWIW, I'm neither for nor against EDHOC, but...

On 28/03/2019 10:32, Roman Danyliw wrote:
> Chartering a narrowly scoped, short-lived WG in this space with EDHOC
> as a starting point seems to be an attractive path forward, but we
> would like to receive community feedback on the degree of support for
> this approach.

I'd guess that there's no chance of that short-lived bit happening
if people are going to continue to argue for more TLS-like variants
that do similar stuff. I've no clue if that is or is not the case.
A similar situation added a couple of years (and some angst) to
the lifetime of tcpinc.

Cheers,
S.




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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Date: Fri, 29 Mar 2019 05:10:00 -0400
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Subject: Re: [Secdispatch] EDHOC Summary
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On Fri, Mar 29, 2019 at 4:48 AM Stephen Farrell <stephen.farrell@cs.tcd.ie>
wrote:

>
> Hiya,
>
> FWIW, I'm neither for nor against EDHOC, but...
>
> On 28/03/2019 10:32, Roman Danyliw wrote:
> > Chartering a narrowly scoped, short-lived WG in this space with EDHOC
> > as a starting point seems to be an attractive path forward, but we
> > would like to receive community feedback on the degree of support for
> > this approach.
>
> I'd guess that there's no chance of that short-lived bit happening
> if people are going to continue to argue for more TLS-like variants
> that do similar stuff. I've no clue if that is or is not the case.
> A similar situation added a couple of years (and some angst) to
> the lifetime of tcpinc.
>

This has already had 2 years added for that reason, so I'm for moving ahead
since there's interest from multiple parties to implement.

Best,
Kathleen

>
> Cheers,
> S.
>
>
>
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>


-- 

Best regards,
Kathleen

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Fri, Mar 29, 2019 at 4:48 AM Steph=
en Farrell &lt;<a href=3D"mailto:stephen.farrell@cs.tcd.ie">stephen.farrell=
@cs.tcd.ie</a>&gt; wrote:<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"><br>
Hiya,<br>
<br>
FWIW, I&#39;m neither for nor against EDHOC, but...<br>
<br>
On 28/03/2019 10:32, Roman Danyliw wrote:<br>
&gt; Chartering a narrowly scoped, short-lived WG in this space with EDHOC<=
br>
&gt; as a starting point seems to be an attractive path forward, but we<br>
&gt; would like to receive community feedback on the degree of support for<=
br>
&gt; this approach.<br>
<br>
I&#39;d guess that there&#39;s no chance of that short-lived bit happening<=
br>
if people are going to continue to argue for more TLS-like variants<br>
that do similar stuff. I&#39;ve no clue if that is or is not the case.<br>
A similar situation added a couple of years (and some angst) to<br>
the lifetime of tcpinc.<br></blockquote><div><br></div><div>This has alread=
y had 2 years added for that reason, so I&#39;m for moving ahead since ther=
e&#39;s interest from multiple parties to implement.=C2=A0=C2=A0</div><div>=
<br></div><div>Best,</div><div>Kathleen</div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex">
<br>
Cheers,<br>
S.<br>
<br>
<br>
<br>
_______________________________________________<br>
Secdispatch mailing list<br>
<a href=3D"mailto:Secdispatch@ietf.org" target=3D"_blank">Secdispatch@ietf.=
org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/secdispatch" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/secdispatch</=
a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><div dir=3D"ltr"><br><div>Best regards,</div><di=
v>Kathleen</div></div></div></div>

--00000000000040bf000585380b4f--


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The CoRE WG is the owner of the OSCORE specification that is often best =
used in conjunction with a low-resource authenticated key agreement =
mechanism.

At the Friday CoRE meeting at IETF104, we discussed the actions proposed =
below.=20
Among the 30 WG members in the room, we had in-room consensus that they =
are the best way forward.

Gr=C3=BC=C3=9Fe, Carsten


> On Mar 28, 2019, at 11:32, Roman Danyliw <rdd@cert.org> wrote:
>=20
> Hi!
>=20
> We have observed the continued discussion and interest in the topics =
discussed at the March 2019 Virtual Interim Secdispatch meeting [1].  =
Our assessment of the current state of this discuss and as well as =
proposed next steps are below.
>=20
> Regards,
> Roman and Ben
>=20
> [1] =
https://mailarchive.ietf.org/arch/msg/secdispatch/9AfqrecZfFMlMGxSXOo4ENZt=
rVk
>=20
> =3D=3D[ Summary of ADs ]=3D=3D
> EDHOC Summary
>=20
> -----[ 1. What is the problem we are faced with?
>=20
> The community needs an AKE that is 'lightweight' (per slide #3 of [2]) =
and enables forward security for constrained environments using OSCORE =
[13].  'Lightweight' refers to:
>=20
> ** resource consumption, measured by bytes on the wire, wall-clock =
time to complete (i.e., the initial latency added to application =
protocols by the AKE), or power (per slide #12 of [2])
> ** the amount of new code required on end systems which already have =
an OSCORE stack [4]=20
>=20
> -----[ 2. Is the problem understood and narrowly scoped?
>=20
> Use with OSCORE implicitly assumes that this AKE would support:
> ** transport over CoAP, and
> ** COSE algorithms
>=20
> The specific constrained environments that we are considering use =
NB-IoT, 6TiSCH, and LoRaWAN.  The desire is to optimize the AKE to be =
'as [small] ... as reasonably achievable' (per [3]) in these =
environments.
>=20
> ** With respect to 6TiSCH, IETF consensus on the 6TiSCH WG charter has =
already identified the need to "secur[e] the join process and mak[e] =
that fit within the constraints of high latency, low throughput and =
small frame sizes that characterize IEEE802.15.4 TSCH." [12].
> ** With respect to NB-IoT and LoRaWAN, IETF consensus on the LPWAN WG =
charter has identified the need to improve the transport capabilities of =
LPWA networks such as NB-IoT and LoRa whose "common traits include ... =
frame sizes ... [on] the order of tens of bytes transmitted a few times =
per day at ultra-low speeds" [16]. This indicates IETF interest in =
supporting these radio environments, though no security-specific =
requirements are included in the charter.
>=20
> It may be necessary to evaluate options that make different trade-offs =
across a number of dimensions.
>=20
> ** Per 'bytes on the wire', it is desirable for these AKE messages to =
fit into the MTU size of these protocols; and if not possible, within as =
few frames as possible.  Note that using multiple MTUs can have =
significant costs in terms of time and power (listed below). For 6TiSCH =
specifically, as a time-sliced network, this metric (or rather, the =
quantization into frame count) is particularly noteworthy, since more =
frames contribute  to congestion for spectrum (and concomitant error =
rates) in a non-linear way, especially in scenarios when large numbers =
of independent nodes are attempting to execute an AKE to join a network.
>=20
> ** Per 'time', it is desirable for the AKE message exchange(s) to =
complete in a reasonable amount of time, both for a single uncongested =
exchange and when multiple exchanges are running in an interleaved =
fashion.  This latency may not be a linear function depending on =
congestion and the specific radio technology used.  For LoRaWAN, which =
is legally required to use a 1% (or smaller) duty cycle, a payload split =
into two fragments instead of one increases the time to complete the =
sending of this payload by 10,000% (per slide #10 of [2]). =20
>=20
> ** Per 'power', it is desirable for the transmission of AKE messages =
and crypto to draw as little power as possible  The best mechanism for =
doing so differs across radio technologies.  For example, NB-IoT uses =
licensed spectrum and thus can transmit at higher power to improve =
coverage, making the transmitted byte count relatively more important =
than for other radio technologies.  In other cases, the radio =
transmitter will be active for a full MTU frame regardless of how much =
of the frame is occupied by message content, which makes the byte count =
less sensitive for the power consumption.  Increased power consumption =
is unavoidable in poor network conditions, such as most wide-area =
settings including LoRaWAN.
>=20
> ** Per 'new code', it is desirable to introduce as little new code as =
possible onto OSCORE-enabled devices to support this new AKE.  These =
devices have on the order of 10s of kB of memory and 100s of kB of =
storage on which an embedded OS; a COAP stack; CORE and AKE libraries; =
and target applications would run.  It is expected that the majority of =
this space is  available for actual application logic, as opposed to the =
support libraries.
>=20
> A key question to answer is whether any new solution will reduce these =
properties to a sufficient extent to merit investment.
>=20
> -----[ 3. Do we believe it is possible to engineer a solution?
>=20
> EDHOC [1] appears to be an existence proof that it is possible to =
produce an AKE that meaningfully reduces the costs across at least two =
dimensions identified in question #1 and 2 (bytes and time). =20
>=20
> EDHOC appears to favorably outperform TLS/CoAP, the current =
technology, relative to these dimensions.=20
>=20
> ** Per 'bytes on the wire', MTU sizes and their alignment to the size =
of messages of EDHOC vs. TLS/CoAP can be found in slide #33 of [2], and =
in [5].  Additional details for 6TiSCH in particular can be found in =
slide 36-37 of [2].
>=20
> ** Per 'time', the latency due to back-off time estimates with EDHOC =
vs. TLS/CoAP using LoRaWAN can be found in slide #39 of [2]
>=20
> ** Per 'power', estimates of the power usage of EDHOC vs TLS/CoAP =
using NB-IoT can be found in slide #35 of [2]=20
>=20
> ** Per 'new code', being able to reuse primitives from the existing =
COSE stack is expected to benefit the code size for EDHOC, but no hard =
data is yet available for comparison. =20
>=20
> Exploratory work with cTLS [10] and femtoTLS [11] has suggested that =
certain optimizations used in EDHOC can also be applied to a =
TLS/CoAP-variant.  How this impacts the original assumptions and =
security analysis for (D)TLS is unknown.=20
>=20
> -----[ 4. Is this particular proposal a good basis for working on?=20
>=20
> EDHOC shows gains in defining an AKE with forward secrecy that is =
'reasonably small[er]' than the baseline of (D)TLS.  Specifically, it =
appears that EDHOC would enable:
> ** for 6TiSCH, a more efficient network join operation, with network =
join traffic fitting in one frame per flight (that is, the optimal =
possible behavior) in up to a 5-hop network [17]
> ** for LoRaWAN, an AKE with forward secrecy that avoids the =
unacceptable backoff-induced latency=20
>=20
> A limited interop was performed on draft-selander-ace-cose-ecdhe-05 =
(EDHOC) at IETF 98 between [14] and [15].  Despite the inherent =
challenges of producing a new AKE that is secure, there is reason to =
have confidence in the security claims made by EDHOC -- the security =
properties of -08 were formally verified by [8][9].  Identified issues =
from this formal analysis [8] were addressed in -11.  The CFRG crypto =
review panel conducted two reviews [6][7].  These reviews confirmed that =
the security claims are reasonable, attested that the identified issues =
found in the formal analysis [8] were fixed, and provided additional =
recommendations.
>=20
> Re-encoding of the TLS handshake as suggested by cTLS [10] may be =
possible.  However, as of yet, cTLS is an incomplete specification, cTLS =
has no formal security analysis, and is technically a new protocol.
>=20
> -----[ Conclusion
>=20
> There appears to be an understood and scoped problem that is feasible =
to engineer.  Among the available starting points to address the problem =
defined in question #1, EDHOC presents a viable choice. =20
>=20
> Chartering a narrowly scoped, short-lived WG in this space with EDHOC =
as a starting point seems to be an attractive path forward, but we would =
like to receive community feedback on the degree of support for this =
approach.
>=20
> -----[ References
> [1] https://www.ietf.org/id/draft-selander-ace-cose-ecdhe-13.txt
> [2] =
https://datatracker.ietf.org/meeting/interim-2019-secdispatch-01/materials=
/slides-interim-2019-secdispatch-01-sessa-edhoc.pdf
> [3] =
https://mailarchive.ietf.org/arch/msg/secdispatch/-GPqswnS-DRvrAKsPbdoes4Y=
4lE
> [4] =
https://mailarchive.ietf.org/arch/msg/secdispatch/rJqvstLHo7aLfu-ODril-wIV=
n_0
> [5] =
https://docs.google.com/document/d/1wLoIexMLG3U9iYO5hzGzKjkvi-VDndQBbYRNsM=
Ulh-k
> [6] =
https://mailarchive.ietf.org/arch/msg/cfrg/6WN2C2RYGTIAInE2jIUco6L9pO8
> [7] =
https://mailarchive.ietf.org/arch/msg/cfrg/2OY2om1FjhNNBmUzwYJroHv7eWQ
> [8] https://alessandrobruni.name/papers/18-edhoc.pdf
> [9] https://github.com/theisgroenbech/edhoc-proverif
> [10] https://tools.ietf.org/html/draft-rescorla-tls-ctls-01
> [11] https://github.com/bifurcation/mint/compare/ftls
> [12] https://datatracker.ietf.org/doc/charter-ietf-6tisch/
> [13] https://datatracker.ietf.org/doc/draft-ietf-core-object-security/
> [14] https://github.com/alexkrontiris/EDHOC-C
> [15] https://github.com/jimsch/EDHOC-csharp
> [16] https://datatracker.ietf.org/doc/charter-ietf-lpwan/
> [17] =
https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zerotouch-jo=
in
>=20
> =3D=3D[ End ]=3D=3D
>=20
> _______________________________________________
> Secdispatch mailing list
> Secdispatch@ietf.org
> https://www.ietf.org/mailman/listinfo/secdispatch
>=20


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+1

On 29/03/2019 08.58, Antonio Skarmeta wrote:
> +1
>
> El 29/03/2019 a las 8:13, John Mattsson escribió:
>> +1
>>
>> Jim Schaad <ietf@augustcellars.com>; wrote:
>>
>>      > I am strongly in agreement with doing this.
>>
>> _______________________________________________
>> Secdispatch mailing list
>> Secdispatch@ietf.org
>> https://www.ietf.org/mailman/listinfo/secdispatch
>

-- 
Jesús Sánchez Gómez
+34 868 88 78 53
+34 635 33 26 09
jesus.sanchez4@um.es
Department of Information and Communication Engineering
Faculty of Computer Science
University of Murcia
30100 Murcia, Spain


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Date: Sat, 30 Mar 2019 18:31:29 +0100 (CET)
From: Thomas Watteyne <thomas.watteyne@inria.fr>
To: secdispatch@ietf.org
Cc: 6tisch <6tisch@ietf.org>, 6tisch-chairs <6tisch-chairs@ietf.org>
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Thread-Topic: EDHOC Summary
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Subject: [Secdispatch] EDHOC Summary
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The 6TiSCH WG has produced a set of documents [1,2] that specify the use of OSCORE to secure message exchanges at the application layer including network access. At the side meeting in Prague two years ago involving several ADs and WG chairs, the 6TiSCH chairs have indicated the need for an efficient authenticated key exchange protocol that we could use during the network access to key OSCORE. We have also restated this request at the SECDISPATCH interim a couple of weeks ago. 

The EDHOC specification was discussed on numerous occasions during the 6TiSCH working group meetings and the approach on using it for the extension of [1] towards zero-touch [3] deployments had a wide consensus. We welcome the work in this area to be done, and strongly support any decision of the security ADs that leads to the fast progress of this specification. 

[1] [ https://datatracker.ietf.org/doc/draft-ietf-6tisch-minimal-security/ | https://datatracker.ietf.org/doc/draft-ietf-6tisch-minimal-security/ ] 
[2] [ https://datatracker.ietf.org/doc/draft-ietf-6tisch-architecture/ | https://datatracker.ietf.org/doc/draft-ietf-6tisch-architecture/ ] 
[3] [ https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zerotouch-join/ | https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zerotouch-join/ ] 


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<html><body><div style=3D"font-family: arial, helvetica, sans-serif; font-s=
ize: 10pt; color: #000000"><div> <!--StartFragment--><span style=3D"color: =
#000000; font-family: 'Segoe UI', 'Lucida Sans', sans-serif; font-size: 14.=
16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps=
: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align:=
 start; text-indent: 0px; text-transform: none; white-space: normal; widows=
: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #=
fdfdfd; text-decoration-style: initial; text-decoration-color: initial; dis=
play: inline !important; float: none;" data-mce-style=3D"color: #000000; fo=
nt-family: 'Segoe UI', 'Lucida Sans', sans-serif; font-size: 14.16px; font-=
style: normal; font-variant-ligatures: normal; font-variant-caps: normal; f=
ont-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; tex=
t-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-s=
pacing: 0px; -webkit-text-stroke-width: 0px; background-color: #fdfdfd; tex=
t-decoration-style: initial; text-decoration-color: initial; display: inlin=
e !important; float: none;">The 6TiSCH WG has produced a set of documents [=
1,2] that specify the use of OSCORE to secure message exchanges at the appl=
ication layer including network access. At the side meeting in Prague two y=
ears ago involving several ADs and WG chairs, the 6TiSCH chairs have indica=
ted the need for an efficient authenticated key exchange protocol that we c=
ould use during the network access to key OSCORE. We have also restated thi=
s request at the SECDISPATCH interim a couple of weeks ago.</span><div clas=
s=3D"" style=3D"color: #000000; font-family: 'Segoe UI', 'Lucida Sans', san=
s-serif; font-size: 14.16px; font-style: normal; font-variant-ligatures: no=
rmal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; =
orphans: 2; text-align: start; text-indent: 0px; text-transform: none; whit=
e-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0=
px; background-color: #fdfdfd; text-decoration-style: initial; text-decorat=
ion-color: initial;" data-mce-style=3D"color: #000000; font-family: 'Segoe =
UI', 'Lucida Sans', sans-serif; font-size: 14.16px; font-style: normal; fon=
t-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; l=
etter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; tex=
t-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webk=
it-text-stroke-width: 0px; background-color: #fdfdfd; text-decoration-style=
: initial; text-decoration-color: initial;"><br class=3D""></div><div class=
=3D"" style=3D"color: #000000; font-family: 'Segoe UI', 'Lucida Sans', sans=
-serif; font-size: 14.16px; font-style: normal; font-variant-ligatures: nor=
mal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; o=
rphans: 2; text-align: start; text-indent: 0px; text-transform: none; white=
-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0p=
x; background-color: #fdfdfd; text-decoration-style: initial; text-decorati=
on-color: initial;" data-mce-style=3D"color: #000000; font-family: 'Segoe U=
I', 'Lucida Sans', sans-serif; font-size: 14.16px; font-style: normal; font=
-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; le=
tter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text=
-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webki=
t-text-stroke-width: 0px; background-color: #fdfdfd; text-decoration-style:=
 initial; text-decoration-color: initial;">The EDHOC specification was disc=
ussed on numerous occasions during the 6TiSCH working group meetings and th=
e approach on using it for the extension of [1] towards zero-touch [3] depl=
oyments had a wide consensus. We welcome the work in this area to be done, =
and strongly support any decision of the security ADs that leads to the fas=
t progress of this specification.</div><div class=3D"" style=3D"color: #000=
000; font-family: 'Segoe UI', 'Lucida Sans', sans-serif; font-size: 14.16px=
; font-style: normal; font-variant-ligatures: normal; font-variant-caps: no=
rmal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: sta=
rt; text-indent: 0px; text-transform: none; white-space: normal; widows: 2;=
 word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #fdfd=
fd; text-decoration-style: initial; text-decoration-color: initial;" data-m=
ce-style=3D"color: #000000; font-family: 'Segoe UI', 'Lucida Sans', sans-se=
rif; font-size: 14.16px; font-style: normal; font-variant-ligatures: normal=
; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orph=
ans: 2; text-align: start; text-indent: 0px; text-transform: none; white-sp=
ace: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: #fdfdfd; text-decoration-style: initial; text-decoration-=
color: initial;"><div class=3D""><div class=3D""><div class=3D""><div class=
=3D""><br class=3D""></div><div class=3D"">[1]<span>&nbsp;</span><span clas=
s=3D"Object" role=3D"link" id=3D"OBJ_PREFIX_DWT65_com_zimbra_url" style=3D"=
color: darkblue; text-decoration: none; cursor: pointer;" data-mce-style=3D=
"color: darkblue; text-decoration: none; cursor: pointer;"><a href=3D"https=
://datatracker.ietf.org/doc/draft-ietf-6tisch-minimal-security/" class=3D""=
 target=3D"_blank" style=3D"color: darkblue; text-decoration: none; cursor:=
 pointer;" data-mce-href=3D"https://datatracker.ietf.org/doc/draft-ietf-6ti=
sch-minimal-security/" data-mce-style=3D"color: darkblue; text-decoration: =
none; cursor: pointer;">https://datatracker.ietf.org/doc/draft-ietf-6tisch-=
minimal-security/</a></span>&nbsp;</div><div class=3D"">[2]&nbsp;<span clas=
s=3D"Object" role=3D"link" id=3D"OBJ_PREFIX_DWT66_com_zimbra_url" style=3D"=
color: darkblue; text-decoration: none; cursor: pointer;" data-mce-style=3D=
"color: darkblue; text-decoration: none; cursor: pointer;"><a href=3D"https=
://datatracker.ietf.org/doc/draft-ietf-6tisch-architecture/" class=3D"" tar=
get=3D"_blank" style=3D"color: darkblue; text-decoration: none; cursor: poi=
nter;" data-mce-href=3D"https://datatracker.ietf.org/doc/draft-ietf-6tisch-=
architecture/" data-mce-style=3D"color: darkblue; text-decoration: none; cu=
rsor: pointer;">https://datatracker.ietf.org/doc/draft-ietf-6tisch-architec=
ture/</a></span></div></div></div></div></div><div class=3D"" style=3D"colo=
r: #000000; font-family: 'Segoe UI', 'Lucida Sans', sans-serif; font-size: =
14.16px; font-style: normal; font-variant-ligatures: normal; font-variant-c=
aps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-ali=
gn: start; text-indent: 0px; text-transform: none; white-space: normal; wid=
ows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color=
: #fdfdfd; text-decoration-style: initial; text-decoration-color: initial;"=
 data-mce-style=3D"color: #000000; font-family: 'Segoe UI', 'Lucida Sans', =
sans-serif; font-size: 14.16px; font-style: normal; font-variant-ligatures:=
 normal; font-variant-caps: normal; font-weight: 400; letter-spacing: norma=
l; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; w=
hite-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width=
: 0px; background-color: #fdfdfd; text-decoration-style: initial; text-deco=
ration-color: initial;">[3]&nbsp;<span class=3D"Object" role=3D"link" id=3D=
"OBJ_PREFIX_DWT67_com_zimbra_url" style=3D"color: darkblue; text-decoration=
: none; cursor: pointer;" data-mce-style=3D"color: darkblue; text-decoratio=
n: none; cursor: pointer;"><a href=3D"https://datatracker.ietf.org/doc/draf=
t-ietf-6tisch-dtsecurity-zerotouch-join/" class=3D"" target=3D"_blank" styl=
e=3D"color: darkblue; text-decoration: none; cursor: pointer;" data-mce-hre=
f=3D"https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zerotouc=
h-join/" data-mce-style=3D"color: darkblue; text-decoration: none; cursor: =
pointer;">https://datatracker.ietf.org/doc/draft-ietf-6tisch-dtsecurity-zer=
otouch-join/</a></span>&nbsp;</div><!--EndFragment--><div style=3D"clear: b=
oth;" data-mce-style=3D"clear: both;"><br></div></div></div></body></html>
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