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Re: [AVTCORE] Summary of discussion with IESG and call for consensus regarding AES-GCM draft

John Mattsson <john.mattsson@ericsson.com> Wed, 04 March 2015 22:10 UTC

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From: John Mattsson <john.mattsson@ericsson.com>
To: Magnus Westerlund <magnus.westerlund@ericsson.com>
Thread-Topic: [AVTCORE] Summary of discussion with IESG and call for consensus regarding AES-GCM draft
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Date: Wed, 04 Mar 2015 22:10:39 +0000
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Cc: "draft-ietf-avtcore-srtp-aes-gcm@tools.ietf.org" <draft-ietf-avtcore-srtp-aes-gcm@tools.ietf.org>, IETF AVTCore WG <avt@ietf.org>
Subject: Re: [AVTCORE] Summary of discussion with IESG and call for consensus regarding AES-GCM draft
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On 02 Mar 2015, at 12:53, Magnus Westerlund <magnus.westerlund@ericsson.com<mailto:magnus.westerlund@ericsson.com>> wrote:

WG,

Last Thursday Kevin Igoe and I participated in a phone conference with
IESG to discuss the way forward with draft-ietf-avtcore-srtp-aes-gcm.

After some discussion the conclusion was the following:

1. Proposal to remove AES-CCM modes from the draft, if clear need arise
a AES-CCM only separate draft can be created. But, that will not be done
without clear motivation for why CCM is needed. So if you think CCM is
required, please step up and comment on this.

2. The AES-GCM draft is proposed to contain the following configurations:

      AEAD_AES_128_GCM     (with 16 byte authentication tag)
      AEAD_AES_128_GCM_64  (with 8 byte authentication tag)

Is the proposal then to include the profile from draft-ietf-avtcore-srtp-aes-gcm-12 with a maximum key lifetime  of 2^17 packets? Just so that everybody understands that a rekey would be needed every 43 minutes for a codec with 20 ms payload size.

      AEAD_AES_256_GCM     (with 16 byte authentication tag)


If any one in the WG has issues with either of these proposals, please
comment on this no later than 16th of March.

Cheers

Magnus Westerlund

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