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Re: [Cfrg] Call for adoption for draft-wood-cfrg-aead-limits

"David McGrew (mcgrew)" <mcgrew@cisco.com> Wed, 22 July 2020 14:58 UTC

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From: "David McGrew (mcgrew)" <mcgrew@cisco.com>
To: "Stanislav V. Smyshlyaev" <smyshsv@gmail.com>
CC: CFRG <cfrg@irtf.org>, "cfrg-chairs@ietf.org" <cfrg-chairs@ietf.org>
Thread-Topic: [Cfrg] Call for adoption for draft-wood-cfrg-aead-limits
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Date: Wed, 22 Jul 2020 14:58:43 +0000
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Subject: Re: [Cfrg] Call for adoption for draft-wood-cfrg-aead-limits
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Hi Stanislav,

I support adoption.  The draft is well written and clear, but I have a few review comments below.

The confidentiality advantage definition measures the increase in probability that an attacker can "distinguish an AEAD ciphertext from the output of an ideal pseudorandom permutation (PRP).”   That should read “random function” instead of “ideal PRP”.  It would be good to add a reference that explains what the advantage means.

In Table 1, I suggest rewording “Size of the AEAD block cipher (in bits)” to “Number of bits per block”

The number q is defined both as the "number of protected messages” and “encryption attempts”; I think the former will make more sense to the reader.   It might be helpful to define q and v in terms of the number of invocations of the Authenticated Encryption and Authenticated Decryption functions from RFC5116.

Thanks,

David

On Jul 22, 2020, at 8:17 AM, Stanislav V. Smyshlyaev <smyshsv@gmail.com<mailto:smyshsv@gmail.com>> wrote:

Dear CFRG participants,
This email commences a 3-week call for adoption for "Usage Limits on AEAD Algorithms" draft (draft-wood-cfrg-aead-limits-00) that will end on August 11th 2020:

https://datatracker.ietf.org/doc/draft-wood-cfrg-aead-limits/

Please give your views on whether this document should be adopted as a CFRG draft, and if so, whether you'd be willing to help work on it/review it. Please reply to this email (or in exceptional circumstances you can email CFRG chairs directly at cfrg-chairs@ietf.org<mailto:cfrg-chairs@ietf.org>).

Thank you,
Stanislav (for the chairs)
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