Re: [IPsec] Working Group Last Call: draft-ietf-ipsecme-esp-ah-reqts

Paul Wouters <paul@nohats.ca> Mon, 03 March 2014 22:34 UTC

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Date: Mon, 3 Mar 2014 17:34:46 -0500 (EST)
From: Paul Wouters <paul@nohats.ca>
To: Tero Kivinen <kivinen@iki.fi>
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Cc: ipsec <ipsec@ietf.org>, Valery Smyslov <svanru@gmail.com>
Subject: Re: [IPsec] Working Group Last Call: draft-ietf-ipsecme-esp-ah-reqts
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On Mon, 3 Mar 2014, Tero Kivinen wrote:

> Hmm... actually we should most like use the same names we use in the
> IANA registry. For example we have 3 different types of AES-GCM:
>
> 18   AES-GCM with a 8 octet ICV    [RFC4106]   [RFC5282]
> 19   AES-GCM with a 12 octet ICV   [RFC4106]   [RFC5282]
> 20   AES-GCM with a 16 octet ICV   [RFC4106]   [RFC5282]
>
> Which one of those is the one that is moved to SHOULD+? Should we just
> pick one of them, and say that it is the one we prefer, or should all
> implementations implement all of them? AES-CCM has similar thing, but
> as they are moving to MAY it does not really matter.

Actually yes. I talked to one of the authors of RFC 4106, John Viega,
a while ago and he said:

"Some people seemed  to think embedded devices would want to use truncated
  tags. in this day in age, I would recommend AGAINST tag truncation"

So I would be happy to only move ID 20 to SHOULD+ and actually demote
18 and 19.

Paul