Re: [CGA-EXT] WGLC for draft-ietf-csi-hash-threat-10.txt

Roque Gagliano <rogaglia@cisco.com> Fri, 23 July 2010 11:33 UTC

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From: Roque Gagliano <rogaglia@cisco.com>
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Date: Fri, 23 Jul 2010 13:33:16 +0200
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To: marcelo bagnulo braun <marcelo@it.uc3m.es>
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Cc: "Laganier, Julien" <julienl@qualcomm.com>, "cga-ext@ietf.org" <cga-ext@ietf.org>, Jari Arkko <Jari.Arkko@ericsson.com>, Ralph Droms <rdroms@cisco.com>
Subject: Re: [CGA-EXT] WGLC for draft-ietf-csi-hash-threat-10.txt
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Hi,

I first would like to say that I am very pleased with the outcome of the review process. Particularly Section 3.2 addresses some of the concerns I raised after WG last-call.


I do have some additional comments:

1) I still find odds that the document talks about MD5 and SHA-1 hashing in the PKIX certificate when the only current algorithm described in the cert-profile document (taken from the SIDR document) is SHA-256, there should not be any MD5 or SHA-1 used for signature for the PKIX certificates for SEND. Moreover, there is no reference to MD5 in the RFC3971.

2) I would also add a reference to the cert-profile document.

3) The attack on 3.2 has not "yet" been demonstrated for SHA-256. That should be clarified. 

4) By adding the SKI Trust Anchor identifier (draft-ietf-csi-send-name-type-registry), we are also adding another use of hashes in SEND. There is some text in the security section of that document about the effect of a collision affecting the SKI. You could also add this particular text.

Regards,

Roque

On Jul 12, 2010, at 8:49 AM, marcelo bagnulo braun wrote:

> Hi,
> 
> Based on the reviews we got, the authors have produced a new version of this document. Considering the amount of changes, we are issuing a new WGLC.
> Please review the document and comment before monday 26th of july.
> 
> Find the details attached.
> 
> Regards, marcelo
> 
> -------- Mensaje original --------
> Asunto: 	I-D Action:draft-ietf-csi-hash-threat-10.txt
> Fecha: 	Sun, 11 Jul 2010 17:45:02 -0700 (PDT)
> De: 	Internet-Drafts@ietf.org
> Responder a: 	internet-drafts@ietf.org
> Para: 	i-d-announce@ietf.org
> CC: 	cga-ext@ietf.org
> 
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Cga&  Send maIntenance Working Group of the IETF.
> 
> 
> 	Title           : SEND Hash Threat Analysis
> 	Author(s)       : A. Kukec, et al.
> 	Filename        : draft-ietf-csi-hash-threat-10.txt
> 	Pages           : 6
> 	Date            : 2010-07-11
> 
> This document analyzes the use of hashes in Secure Neighbor Discovery
> (SEND), the possible threats to these hashes and the impact of recent
> attacks on hash functions used by SEND.  The SEND specification
> [RFC3971] currently uses the SHA-1 [SHA1] hash algorithm and PKIX
> certificates [RFC5280] and does not provide support for hash
> algorithm agility.  This document provides an analysis of possible
> threats to the hash algorithms used in SEND.
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-csi-hash-threat-10.txt
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
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> 
> <draft-ietf-csi-hash-threat-10.txt><Parte del mensaje adjunto.txt>_______________________________________________
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