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Re: [Gen-art] Gen-ART review of draft-ietf-mpls-gach-adv-06

Martin Thomson <martin.thomson@gmail.com> Fri, 26 April 2013 18:45 UTC

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Date: Fri, 26 Apr 2013 11:45:22 -0700
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From: Martin Thomson <martin.thomson@gmail.com>
To: stbryant@cisco.com
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Cc: "Bocci, Matthew (Matthew)" <matthew.bocci@alcatel-lucent.com>, "gen-art@ietf.org" <gen-art@ietf.org>, danfrost@cisco.com, draft-ietf-mpls-gach-adv.all@tools.ietf.org, sec-ads@tools.ietf.org
Subject: Re: [Gen-art] Gen-ART review of draft-ietf-mpls-gach-adv-06
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On 26 April 2013 10:44, Stewart Bryant <stbryant@cisco.com> wrote:
> Section 6.3 now says
>
> The HMAC proceedure described in [RFC2104] is used to compute the hash.

s/proceedure/procedure/

> The hash is computed over the entire GAP message as shown in Fig1.

What value does the Authentication TLV have when it is input to the HMAC?

> The length of the Authentication Data field is always less than or equal
> to the message digest size of the specific hash function that is being
> used, however the implementer needs to consider that although this
> decreases the size of the message, it results in a corresponding
> reduction in the strength of the assurance provided.
> Hash truncation is not RECOMMENDED.

This last part could probably be a new paragraph.

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