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Re: [CFRG] Update of Classic McEliece and Chempat drafts

Loganaden Velvindron <loganaden@gmail.com> Fri, 19 April 2024 08:29 UTC

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From: Loganaden Velvindron <loganaden@gmail.com>
Date: Fri, 19 Apr 2024 12:29:12 +0400
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To: Simon Josefsson <simon=40josefsson.org@dmarc.ietf.org>
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Subject: Re: [CFRG] Update of Classic McEliece and Chempat drafts
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On Sun, 14 Apr 2024 at 15:00, Simon Josefsson
<simon=40josefsson.org@dmarc.ietf.org> wrote:
>
> All,
>
> I've updated the Classic McEliece draft to fix some feedback given on
> the list earlier, and to refresh the draft before it expired.
>
Thank you for your work.

> https://datatracker.ietf.org/doc/html/draft-josefsson-mceliece-01
>
Small nit:

>From section 11 Security considerations:
"Implementation should be designed to minize leaking of security
sensitive material, including protecting against side-channel
attacks."

s/minize/minimize




> I have considered a pure-PQ HPKE KEM based on Classic McEliece and
> publish a specification for that.  There has been a flow of recent
> interesting papers [1] [2] on what properties we want from KEM's.  I
> feel that the cost to add a X25519/X448 operation is low compared to the
> McEliece part, so I have updated the Chempat KEM draft to provide
> instantiations for all combinations of X25519/X448 and Classic McEliece.
>
> https://datatracker.ietf.org/doc/html/draft-josefsson-chempat-01
>
> I recommend everyone that is deploying Classic McEliece to consider
> doing so in a hybrid mode with X25519/X448.  Since people seem to chose
> different Classic McEliece parameters, I wanted to provide a Chempat
> option to combine any choice with trusted X25519/X448 implementations.
>
> What do you think?
This is a good idea.

>
> /Simon
>
> [1] https://eprint.iacr.org/2023/1933
> [2] https://eprint.iacr.org/2024/523
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