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From: Andrei Gurtov <gurtov@cs.helsinki.fi>
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Subject: [Hipsec] interlock for HIP
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Hi,

I suppose HIP in the current form without PKI is prone to 
man-in-the-middle attacks because it uses basic diffie-hellman key 
exchange. Have there been ideas of integrating the interlock protocol in 
base exchange to prevent MitM attacks? These would require one or more 
additional RTTs as the key material would be split over two or more 
messages.

Andrei

http://www.quadibloc.com/crypto/mi060709.htm

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From hipsec-bounces@lists.ietf.org Fri Feb 03 06:07:33 2006
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From: Pekka Nikander <pekka.nikander@nomadiclab.com>
Subject: Re: [Hipsec] interlock for HIP
Date: Fri, 3 Feb 2006 13:07:04 +0200
To: Andrei Gurtov <gurtov@cs.helsinki.fi>
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> I suppose HIP in the current form without PKI is prone to man-in- 
> the-middle attacks because it uses basic diffie-hellman key  
> exchange. Have there been ideas of integrating the interlock  
> protocol in base exchange to prevent MitM attacks? These would  
> require one or more additional RTTs as the key material would be  
> split over two or more messages.

Excuse my ignorance, but I can't see how it would help.  In general,  
I believe that you either need TTP, a second independent channel  
(like recognising your peer's voice), or quantum crypto, in order to  
solve the MitM problem.  To be honest, I don't even understand how  
quantum crypto would help, but I've seen claims that it would.

--Pekka


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To: Pekka Nikander <pekka.nikander@nomadiclab.com>
Subject: Re: [Hipsec] interlock for HIP
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I agree with Pekka... However if the goal is to
establish a secure channel between two known HITs,
 Crypto Based Identifier (CBID) 
can also be useful to prevent MitM attack...

cheers,
Claude.

Quoting Pekka Nikander <pekka.nikander@nomadiclab.com>:

> > I suppose HIP in the current form without PKI is prone to man-in- 
> > the-middle attacks because it uses basic diffie-hellman key  
> > exchange. Have there been ideas of integrating the interlock  
> > protocol in base exchange to prevent MitM attacks? These would  
> > require one or more additional RTTs as the key material would be  
> > split over two or more messages.
> 
> Excuse my ignorance, but I can't see how it would help.  In general,  
> I believe that you either need TTP, a second independent channel  
> (like recognising your peer's voice), or quantum crypto, in order to  
> solve the MitM problem.  To be honest, I don't even understand how  
> quantum crypto would help, but I've seen claims that it would.
> 
> --Pekka
> 
> 
> _______________________________________________
> Hipsec mailing list
> Hipsec@lists.ietf.org
> https://www1.ietf.org/mailman/listinfo/hipsec
> 
> 

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I understood that IL cannot provide authentication, i.e. MitM attack of 
the form A to Z and Z to B is still possible. However, it prevents 
"stealth" MitM attack when A and B communicate but Z can eavesdrop.
Perhaps this is already prevented with current HIP mechanisms?

Andrei

Pekka Nikander wrote:

>> I suppose HIP in the current form without PKI is prone to man-in- 
>> the-middle attacks because it uses basic diffie-hellman key  
>> exchange. Have there been ideas of integrating the interlock  
>> protocol in base exchange to prevent MitM attacks? These would  
>> require one or more additional RTTs as the key material would be  
>> split over two or more messages.
>
>
> Excuse my ignorance, but I can't see how it would help.  In general,  
> I believe that you either need TTP, a second independent channel  
> (like recognising your peer's voice), or quantum crypto, in order to  
> solve the MitM problem.  To be honest, I don't even understand how  
> quantum crypto would help, but I've seen claims that it would.
>
> --Pekka
>


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From: Pekka Nikander <pekka.nikander@nomadiclab.com>
Subject: Re: [Hipsec] interlock for HIP
Date: Tue, 7 Feb 2006 19:59:16 +0200
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> I understood that IL cannot provide authentication, i.e. MitM  
> attack of the form A to Z and Z to B is still possible. However, it  
> prevents "stealth" MitM attack when A and B communicate but Z can  
> eavesdrop.
> Perhaps this is already prevented with current HIP mechanisms?

Yes, passive attacks are already prevented by HIP.  However,  
interlock might be interesting for any "lightweight" variant of HIP.

--Pekka


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From hipsec-bounces@lists.ietf.org Wed Feb 08 04:55:17 2006
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Subject: [Hipsec] DNS draft, new pre-version
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Folks,

Based on some comments made off-line by Pekka, I made these three 
small changes to the DNS draft:

1) Added the following paragraph of clarification to Section 4.1. 
Storing HI, HIT and RVS in DNS:

   The rendezvous server field of the HIP resource record stored
   at a given domain name MAY include the domain name itself.  
   A semantically equivalent situation occurs if no rendezvous 
   server is stored in the HIP resource record of that domain.
   Such situations occurs in two cases:

   o  The host is mobile, and the A and/or AAAA resource record(s)
      stored at its domain name contains the IP address(es) of its
      rendezvous server rather than its own one.

   o  The host is stationary, and can be reached directly at IP
      address(es) contained in A and/or AAAA resource record(s) 
      stored at its domain name.  This a degenerated case of
      rendezvous service where the host somewhat acts as a rendezvous
      server for itself.

2) Removed Section 3.3 "Mixed Scenarios" example of DNS query 
behavior, because it was misleading in the context of the first 
change made.

3) Changed the remaining examples in Section 3 "Usage Scenarios" so 
that an Initiator always query first for HIP RR, and if no RVS is 
present in that RR, query for A/AAA RRs.

You can review the change by yourself at these URLs:

<http://julien.laganier.free.fr/draft-ietf-hip-dns-05-pre060208.txt>
<http://julien.laganier.free.fr/draft-ietf-hip-dns-04-to-05-pre060208.html>

IMHO this draft is now ready for publication, so if I nobody objects I 
will submit the new version to the secretariat.

Thanks.

--julien

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From: "Steven M. Bellovin" <smb@cs.columbia.edu>
To: Pekka Nikander <pekka.nikander@nomadiclab.com>
Subject: Re: [Hipsec] interlock for HIP 
In-Reply-To: (Your message of "Tue, 07 Feb 2006 19:59:16 +0200.")
	<987B4688-CFAA-4B95-8801-2CB964ABBC63@nomadiclab.com> 
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In message <987B4688-CFAA-4B95-8801-2CB964ABBC63@nomadiclab.com>, Pekka Nikande
r writes:
>> I understood that IL cannot provide authentication, i.e. MitM  
>> attack of the form A to Z and Z to B is still possible. However, it  
>> prevents "stealth" MitM attack when A and B communicate but Z can  
>> eavesdrop.
>> Perhaps this is already prevented with current HIP mechanisms?
>
>Yes, passive attacks are already prevented by HIP.  However,  
>interlock might be interesting for any "lightweight" variant of HIP.
>

If not used carefully, the interlock protocol provides less protection 
than you might think -- see 
http://www.cs.columbia.edu/~smb/papers/interlock.pdf

		--Steven M. Bellovin, http://www.cs.columbia.edu/~smb



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To: Petri Jokela <petri.jokela@nomadiclab.com>
Subject: Re: [Hipsec] Bellovin-Rescorla analysis needed
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Petri Jokela wrote:

>Pekka Nikander wrote:
>  
>
>>Folks,
>>
>>I am sitting in SAAG and it looks like that we need to do the 
>>Bellovin-Rescorla hash function analysis on HIP, before we submit it  to
>>the IESG.  Otherwise we will just get a Discuss from the security  ADs.
>>    
>>
>...
>  
>
>>Any volunteers?
>>    
>>
>
>How shall we proceed with this issue? Are there any people who can make
>the analysis?
>  
>

Is it still needed? If yes, I could suggest a diploma topic on it or 
assign a summer intern on this.

Andrei

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From: Julien Laganier <julien.IETF@laposte.net>
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Subject: Re: [Hipsec] DNS draft, new pre-version
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On Friday 17 February 2006 01:11, you wrote:
> I have been implementing the DNS draft and have a few comments.
> Overall I think the draft is in good shape.

Hi Jeff, thanks for your review, this is certainly useful.

> The "PK length" field is 8 bits and thus limits (wire-encoded) key
> sizes to < 256 bytes. - With RSA encoding, that means you can't use
> a key size of 2048 bits. There is a note in section 5.5 about
> relaxing the 4096-bit size limit, but that doesn't make sense with
> only 8 bits for "PK length". - DSA eats up quite a bit more space,
> and a 512 bit DSA key (213 bytes) approaches the max. A 1024-bit
> DSA key occupies 405 bytes, so is not possible (et vaan osaa!)
>
> FWIW, in most interops we use 1024-bit RSA keys (132 bytes) which
> fit just fine in the current DNS specification.

My mistake. I'll make the PK length 2 bytes long, that should be 
sufficient.

> Also, as we await IANA allocation of the RR type, any guidance on a
> RR type for experimentation? (e.g., 49 is the next available after
> DNSKEY)

I think 55 might be better, so that in case another RFC defining new 
RR types is published before hip-dns, we don't collide.

> Minor edits:
> section 4.1
> s/may also contains/may also contain/
> section 4.2
> s/attempt to communicate/attempts to communicate/
> section 5
> s/optionnally/optionally/

Done.

> section 7
> - the examples need to be updated with valid HITs (0x40...) and the
> base64 HIs don't seem to be valid

I'll do it.

Thanks.

--julien

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Subject: RE: [Hipsec] DNS draft, new pre-version
Date: Thu, 16 Feb 2006 16:11:02 -0800
Message-ID: <0DF156EE7414494187B087A3C279BDB40163DD29@XCH-NW-6V1.nw.nos.boeing.com>
Thread-Topic: [Hipsec] DNS draft, new pre-version
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From: "Ahrenholz, Jeffrey M" <jeffrey.m.ahrenholz@boeing.com>
To: "Julien Laganier" <julien.IETF@laposte.net>, <hipsec@ietf.org>
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I have been implementing the DNS draft and have a few comments. Overall =
I think the draft is in good shape.

The "PK length" field is 8 bits and thus limits (wire-encoded) key sizes =
to < 256 bytes.
- With RSA encoding, that means you can't use a key size of 2048 bits.
  There is a note in section 5.5 about relaxing the 4096-bit size limit, =
but that doesn't make sense with only 8 bits for "PK length".
- DSA eats up quite a bit more space, and a 512 bit DSA key (213 bytes) =
approaches the max.
  A 1024-bit DSA key occupies 405 bytes, so is not possible (et vaan =
osaa!)

FWIW, in most interops we use 1024-bit RSA keys (132 bytes) which fit =
just fine in the current DNS specification.

Also, as we await IANA allocation of the RR type, any guidance on a RR =
type for experimentation? (e.g., 49 is the next available after DNSKEY)

Minor edits:
section 4.1
s/may also contains/may also contain/
section 4.2
s/attempt to communicate/attempts to communicate/
section 5
s/optionnally/optionally/

section 7
- the examples need to be updated with valid HITs (0x40...) and the =
base64 HIs don't seem to be valid

-Jeff

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To: "Ahrenholz, Jeffrey M" <jeffrey.m.ahrenholz@boeing.com>
Subject: Re: [Hipsec] DNS draft, new pre-version 
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1


>>>>> "Ahrenholz," == Ahrenholz, Jeffrey M <jeffrey.m.ahrenholz@boeing.com> writes:
    Ahrenholz> I have been implementing the DNS draft and have a few
    Ahrenholz> comments. Overall I think the draft is in good shape.

    Ahrenholz> The "PK length" field is 8 bits and thus limits
    Ahrenholz> (wire-encoded) key sizes to < 256 bytes.  - With RSA
    Ahrenholz> encoding, that means you can't use a key size of 2048
    Ahrenholz> bits.  There is a note in section 5.5 about relaxing the

  That would be unacceptable to me.
 
  Why not eliminate the length, move the RSA field to the end of the
packet, and instead, encode the number of rendezvous servers that you
will have and/or the number of bytes that it the portion will take.

  btw, if there is any value in having the rfc4025 .xml file, let me
know. It's online still.

- -- 
]       ON HUMILITY: to err is human. To moo, bovine.           |  firewalls  [
]   Michael Richardson,    Xelerance Corporation, Ottawa, ON    |net architect[
] mcr@xelerance.com      http://www.sandelman.ottawa.on.ca/mcr/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (GNU/Linux)
Comment: Finger me for keys

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=1O4v
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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Host Identity Protocol Working Group of the IETF.

	Title		: Host Identity Protocol (HIP) Domain Name System (DNS) Extensions
	Author(s)	: P. Nikander, J. Laganier
	Filename	: draft-ietf-hip-dns-05.txt
	Pages		: 21
	Date		: 2006-2-17
	
This document specifies a new resource record (RR) for the Domain
   Name System (DNS), and how to use it with the Host Identity Protocol
   (HIP.)  This RR allows a HIP node to store in the DNS its Host
   Identity (HI, the public component of the node public-private key
   pair), Host Identity Tag (HIT, a truncated hash of its public key),
   and the Domain Names of its rendezvous servers (RVS.)

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From hipsec-bounces@lists.ietf.org Mon Feb 20 07:53:44 2006
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From: Julien Laganier <julien.IETF@laposte.net>
To: Michael Richardson <mcr@sandelman.ottawa.on.ca>
Subject: Re: [Hipsec] DNS draft, new pre-version
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Michael and others,

On Friday 17 February 2006 17:28, Michael Richardson wrote:
>
> >>>>> <jeffrey.m.ahrenholz@boeing.com> writes:
>
>     Ahrenholz> The "PK length" field is 8 bits and thus limits
>     Ahrenholz> (wire-encoded) key sizes to < 256 bytes.  - With RSA
>     Ahrenholz> encoding, that means you can't use a key size of
> 2048 Ahrenholz> bits.  There is a note in section 5.5 about
> relaxing the
>
>   That would be unacceptable to me.
>
>   Why not eliminate the length, move the RSA field to the end of
> the packet, and instead, encode the number of rendezvous servers
> that you will have and/or the number of bytes that it the portion
> will take.

Right now I increased the public key length field to 16 bits, so the 
(unintentional) 256 bytes size limit is removed:

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  HIT length   | PK algorithm  |          PK length            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                           HIT                                 ~
   |                                                               |
   +                     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                     |                                         |
   +-+-+-+-+-+-+-+-+-+-+-+                                         +
   |                           Public Key                          |
   ~                                                               ~
   |                                                               |
   +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                               |                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
   |                                                               |
   ~                       Rendezvous Servers                      ~
   |                                                               |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |
   +-+-+-+-+-+-+-+

If we move the public key field at the end like you are proposing, the 
advantage would be that because the rendezvous servers' FQDN are 
self-describing (implicit length), we could remove PK length field 
while not adding rendezvous server field length:

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  HIT length   | PK algorithm  |                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
   |                                                               |
   ~                                                               ~
   |                         HIT                                   |
   +                                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                   |                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                           +
   |                                                               |
   ~                       Rendezvous Servers                      ~
   |                                                               |
   +                     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                     |                                         |
   +-+-+-+-+-+-+-+-+-+-+-+                                         +
   |                                                               |
   ~                                                               ~
   |                          Public Key                           |
   +                                                               +
   |                                                               |
   +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                               |                               
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               

The later looks nicer, but I don't have a strong opinion on the 
question. Hence I'll be happy to implement whatever the WG think is 
better.

--julien

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Subject: RE: [Hipsec] DNS draft, new pre-version
Date: Mon, 20 Feb 2006 15:55:21 -0800
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From: "Ahrenholz, Jeffrey M" <jeffrey.m.ahrenholz@boeing.com>
To: "Julien Laganier" <julien.IETF@laposte.net>,
	"Michael Richardson" <mcr@sandelman.ottawa.on.ca>
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Because the "Rendezvous Servers" section can contain multiple FQDNs, it =
seems that we still need to indicate the number of servers or the length =
as Michael suggests. From my understanding of RFC 1035 section 3.3 =
describing the variable-length wire-encoded domain names, you can only =
describe one variable-length name in this manner, and then it is =
terminated by a label with zero length. After the first zero length, you =
would need to know whether or not you have another RVS name or the start =
of the Public Key.

So I think that the latter format looks a little "too nice", and either =
way (RVS before PK or PK before RVS) you need to have this extra =
(PK/RVS) length field.

-Jeff

> >   Why not eliminate the length, move the RSA field to the end of
> > the packet, and instead, encode the number of rendezvous servers
> > that you will have and/or the number of bytes that it the portion
> > will take.

<snip>
> The later looks nicer, but I don't have a strong opinion on the=20
> question. Hence I'll be happy to implement whatever the WG think is=20
> better.

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From hipsec-bounces@lists.ietf.org Wed Feb 22 03:11:47 2006
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From: Julien Laganier <julien.IETF@laposte.net>
To: hipsec@lists.ietf.org
Subject: Re: [Hipsec] DNS draft, new pre-version
Date: Wed, 22 Feb 2006 09:08:56 +0100
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On Tuesday 21 February 2006 00:55, Ahrenholz, Jeffrey M wrote:
> Because the "Rendezvous Servers" section can contain multiple
> FQDNs, it seems that we still need to indicate the number of
> servers or the length as Michael suggests. From my understanding of
> RFC 1035 section 3.3 describing the variable-length wire-encoded
> domain names, you can only describe one variable-length name in
> this manner, and then it is terminated by a label with zero length.
> After the first zero length, you would need to know whether or not
> you have another RVS name or the start of the Public Key.
>
> So I think that the latter format looks a little "too nice", and
> either way (RVS before PK or PK before RVS) you need to have this
> extra (PK/RVS) length field.

Jeff,

Thanks for pointing this out. Consequently I think we'd better just 
adopt 16 bits length field for the PK.

I modified the draft accordingly, you can check it at:

<http://julien.laganier.free.fr/draft-ietf-hip-dns-06.txt>
<http://julien.laganier.free.fr/draft-ietf-hip-dns-05-to-06.html>

Unless someone object I'll submit it shortly.

--julien

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From: Lars Eggert <lars.eggert@netlab.nec.de>
Subject: Re: [Hipsec] Start re-chartering discussion in Vancouver?
Date: Wed, 22 Feb 2006 09:19:34 +0100
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Hi,

so we started the rechartering discussion in Vancouver, but it didn't  
carry over onto the mailing list. Has anyone started to put together  
a revised charter proposal?

Lars
-- 
Lars Eggert                                     NEC Network Laboratories



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From: Pekka Nikander <pekka.nikander@nomadiclab.com>
Subject: Re: [Hipsec] DNS draft, new pre-version
Date: Wed, 22 Feb 2006 10:26:02 +0200
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> <http://julien.laganier.free.fr/draft-ietf-hip-dns-05-to-06.html>

Looked good to me.

--Pekka


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From: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
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Hi Lars,

we have talked to our AD (by the way, I guess everybody has noticed that 
Mark is now the AD responsible for the HIP WG) and we will be working on 
the new charter shortly.

In any case, our highest priority now is to have the security ADs 
recommend a person to perform the Belovin-Rescorla analysis of the base 
spec. We have already contacted them, but they have not gotten back to 
use yet...

Cheers,

Gonzalo

Lars Eggert wrote:
> Hi,
> 
> so we started the rechartering discussion in Vancouver, but it didn't 
> carry over onto the mailing list. Has anyone started to put together a 
> revised charter proposal?
> 
> Lars
> --Lars Eggert                                     NEC Network Laboratories
> 
> 
> 
> ------------------------------------------------------------------------
> 
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> Hipsec mailing list
> Hipsec@lists.ietf.org
> https://www1.ietf.org/mailman/listinfo/hipsec

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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Host Identity Protocol Working Group of the IETF.

	Title		: Host Identity Protocol (HIP) Domain Name System (DNS) Extensions
	Author(s)	: P. Nikander, J. Laganier
	Filename	: draft-ietf-hip-dns-06.txt
	Pages		: 21
	Date		: 2006-2-27
	
This document specifies a new resource record (RR) for the Domain
   Name System (DNS), and how to use it with the Host Identity Protocol
   (HIP.)  This RR allows a HIP node to store in the DNS its Host
   Identity (HI, the public component of the node public-private key
   pair), Host Identity Tag (HIT, a truncated hash of its public key),
   and the Domain Names of its rendezvous servers (RVS.)

A URL for this Internet-Draft is:
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