Re: [Cfrg] Do we need a selection contest for AEAD?

Thomas Peyrin <thomas.peyrin@gmail.com> Fri, 19 June 2020 17:47 UTC

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From: Thomas Peyrin <thomas.peyrin@gmail.com>
Date: Sat, 20 Jun 2020 01:46:50 +0800
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To: "Stanislav V. Smyshlyaev" <smyshsv@gmail.com>
Cc: CFRG <cfrg@irtf.org>
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Subject: Re: [Cfrg] Do we need a selection contest for AEAD?
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Dear all,

I will be actually sending an RFC draft of Deoxys in the coming weeks like
I promised a few months ago (really sorry, with the COVID-19 confining with
young kids at home, I couldn't advance on it). It will contain misuse
resistant mode (with stronger guarantees than AES-GCM-SIV), leakage
resilient mode with different levels of resilience, the possiblity to
encrypt 2^124 bytes per key. We are currently analyzing the INT-RUP
security of it. All this for about the same efficiency as AES-GCM-SIV.

Regards,

Thomas.


Le sam. 20 juin 2020 à 01:32, Stanislav V. Smyshlyaev <smyshsv@gmail.com> a
écrit :

> Dear CFRG,
>
> The chairs would like to ask for opinions whether it seems reasonable to
> initiate an AEAD mode selection contest in CFRG, to review modern AEAD modes
> and recommend a mode (or several modes) for the IETF.
>
> We’ve recently had a CAESAR contest, and, of course, its results have to
> be taken into account very seriously. In addition to the properties that
> were primarily addressed during the CAESAR contest (like protection against
> side-channel attacks, authenticity/limited privacy damage in case of nonce
> misuse or release of unverified plaintexts, robustness in such scenarios as
> huge amounts of data), the following properties may be especially important
> for the usage of AEAD mechanisms in IETF protocols:
> 1) Leakage resistance.
> 2) Incremental AEAD.
> 3) Commitment AEAD (we've had a discussion in the list a while ago).
> 4) RUP-security (it was discussed in the CAESAR contest, but the finalists
> may have some issues with it, as far as I understand).
> 5) Ability to safely encrypt a larger maximum number of bytes per key
> (discussed in QUIC WG)..
>
> Does this look reasonable?
> Any thoughts about the possible aims of the contest?
> Any other requirements for the mode?
>
> Regards,
> Stanislav, Alexey, Nick
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