Re: [Cfrg] What are the goals of the AEAD bakeoff?

Dmitry Belyavsky <beldmit@gmail.com> Mon, 22 June 2020 16:05 UTC

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From: Dmitry Belyavsky <beldmit@gmail.com>
Date: Mon, 22 Jun 2020 19:04:58 +0300
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To: Paul Grubbs <pag225@cornell.edu>
Cc: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>, CFRG <cfrg@irtf.org>
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Subject: Re: [Cfrg] What are the goals of the AEAD bakeoff?
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Do we really need competition instead of classification?

On Mon, Jun 22, 2020 at 7:03 PM Paul Grubbs <pag225@cornell.edu> wrote:

> I agree that there are a lot of potentially important goals, and that more
> clarity is needed before choosing design targets. This seems like a good
> use case for a multi-round competition: in the first round, people can
> propose design goals, then the CFRG can select a few goals for which people
> propose concrete schemes in subsequent rounds.
>
> On Sun, Jun 21, 2020 at 4:31 PM Blumenthal, Uri - 0553 - MITLL <
> uri@ll.mit.edu> wrote:
>
>> I concur with Watson. Different use cases need different "winners".
>>
>>
>> ´╗┐On 6/21/20, 15:01, "Cfrg on behalf of Watson Ladd" <
>> cfrg-bounces@irtf..org <cfrg-bounces@irtf.org> on behalf of
>> watsonbladd@gmail.com> wrote:
>>
>>     Unlike PAKE, where a multitude of designs all claimed to have achieved
>>     the same security and usability goals, the goals of this competition
>>     seem multifaceted and in tension. On the one side is a desire for
>>     larger encrypted data volumes, either via big blocks or beyond
>>     birthday techniques. Evaluating a big-block construction is likely to
>>     involve substantial symmetric cryptanalysis knowledge.
>>
>>     On the other is a demand for key-committing schemes and nonce hiding
>>     schemes. Both of these are likely to have efficiency costs compared to
>>     potentially one-pass big block (or tweaked) schemes.
>>
>>     I don't think it makes sense to have a competition. I think it makes
>>     sense to articulate the problems and present them to get people
>>     interested in proposing designs/understanding the tradeoffs, and then
>>     maybe have a competition once that is clearer.
>>
>>     Sincerely,
>>     Watson
>>
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-- 
SY, Dmitry Belyavsky