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

"Igoe, Kevin M." <kmigoe@nsa.gov> Mon, 23 February 2015 12:16 UTC

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From: "Igoe, Kevin M." <kmigoe@nsa.gov>
To: 'Magnus Westerlund' <magnus.westerlund@ericsson.com>, 'David McGrew' <mcgrew@cisco.com>
Thread-Topic: Stephen Farrell's Discuss on draft-ietf-avtcore-srtp-aes-gcm-14: (with DISCUSS)
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Date: Mon, 23 Feb 2015 12:16:03 +0000
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Subject: Re: [AVTCORE] Stephen Farrell's Discuss on draft-ietf-avtcore-srtp-aes-gcm-14: (with DISCUSS)
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I am content with that.

> -----Original Message-----
> From: Magnus Westerlund [mailto:magnus.westerlund@ericsson.com]
> Sent: Thursday, February 19, 2015 11:02 AM
> To: David McGrew
> Cc: Stephen Farrell; avtcore-chairs@tools.ietf.org; draft-ietf-avtcore-srtp-aes-gcm@tools.ietf.org; The IESG; Igoe, Kevin M.; IETF
> AVTCore WG
> Subject: Re: Stephen Farrell's Discuss on draft-ietf-avtcore-srtp-aes-gcm-14: (with DISCUSS)
> 
> On 2015-02-15 15:09, David McGrew wrote:
> >
> > My opinion is: it would be best to preserve the existing specification
> > and implementation work, and retain all ten crypto suite definitions.
> > But if we want to make SRTP-AEAD be the first instance in which the
> > IETF will  prioritize simplicity over variety and diversity, I'm good
> > with that, because I certainly see the value of simplicity; then my
> > recommendation would be to eliminate the four 12-octet authentication
> > versions.  That would leave just six crypto suites, with two different
> > modes of operation, two different key sizes, and two different tag
> > lengths (but not all tag lengths for all modes), like this:
> >
> >       srtp-crypto-suite-ext = "AEAD_AES_128_GCM"    /
> >                               "AEAD_AES_256_GCM"    /
> >                               "AEAD_AES_128_CCM"    /
> >                               "AEAD_AES_256_CCM"    /
> >                               "AEAD_AES_128_CCM_8"  /
> >                               "AEAD_AES_256_CCM_8"  /
> >
> 
> Stephen, WG
> 
> Having looked at the feedback provided in this discussion so far, I think the above set of 6 are a reasonable selection without unduly
> limiting functionality, but removing the four least necessary profiles.
> 
> My proposal is that if no one is disagreeing with this in the next week (Prior to Feb 26 at 16:30 UTC) we use it. If someone disagrees we
> hold a discussion at the informal IESG telechat on how to proceed.
> 
> Cheers
> 
> Magnus Westerlund
> 
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