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Re: [AVTCORE] Stephen Farrell's Discuss on draft-ietf-avtcore-srtp-aes-gcm-14: (with DISCUSS)

Martin Thomson <martin.thomson@gmail.com> Mon, 09 February 2015 23:39 UTC

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Date: Tue, 10 Feb 2015 10:38:58 +1100
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From: Martin Thomson <martin.thomson@gmail.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, "draft-ietf-avtcore-srtp-aes-gcm@tools.ietf.org" <draft-ietf-avtcore-srtp-aes-gcm@tools.ietf.org>, David McGrew <mcgrew@cisco.com>, IETF AVTCore WG <avt@ietf.org>, "avtcore-chairs@tools.ietf.org" <avtcore-chairs@tools.ietf.org>, The IESG <iesg@ietf.org>
Subject: Re: [AVTCORE] Stephen Farrell's Discuss on draft-ietf-avtcore-srtp-aes-gcm-14: (with DISCUSS)
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On 10 February 2015 at 09:58, Stephen Farrell <stephen.farrell@cs.tcd.ie> wrote:
>
>           AEAD_AES_128_GCM    = {TBD, TBD }
>           AEAD_AES_128_GCM_12 = {TBD, TBD }

FWIW, I agree with Stephen here.  Other than knowing of its existence,
I haven't been following this work at all.  But I really don't want
SRTP cipher suite proliferation.

I'm personally uninterested in a suite with an abbreviated tag, given
that it's a mere 4 octets of savings.  I know that this was a big deal
in the past, but that gave us the _24 (bits) variants.  In this case,
either save bits by being more aggressive, or drop the _12 (bytes)
variant.

If you keep it, please be consistent and call it _96.

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