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Re: [Uta] FW: New Version Notification for draft-ietf-uta-rfc7525bis-05.txt

Valery Smyslov <smyslov.ietf@gmail.com> Mon, 07 February 2022 07:56 UTC

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From: Valery Smyslov <smyslov.ietf@gmail.com>
To: 'Yaron Sheffer' <yaronf.ietf@gmail.com>, "'Salz, Rich'" <rsalz@akamai.com>, uta@ietf.org
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Date: Mon, 07 Feb 2022 10:55:54 +0300
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Subject: Re: [Uta] FW: New Version Notification for draft-ietf-uta-rfc7525bis-05.txt
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Hi Yaron,

[snipped]

>     Do you want to say anything about EdDSA and the kerfuffle going on in cfrg@ mailing list right now?  No is a
> good, and probably sane, answer.
> 
> No. We discussed it briefly and although we added 25519 for the ECDH key exchange, we are not
> recommending (or even discussing) the use of EdDSA for signatures or certs. So there's nowhere to even
> include such a comment.

The discussion in CFRG was not about EdDSA specifically, but about fault attacks on other deterministic signature
schemes, including deterministic ECDSA. The draft currently recommends using deterministic ECDSA (as specified in RFC6979) 
over the classic one, so we seem to explicitly recommend what cryptographers express concerns of.

On the other hand, it seems to me that "fault attacks" are outside Dolev-Yao model, so I'm not sure
how relevant their concerns are in the context of the draft.

Regards,
Valery.

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