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Re: [Cfrg] Recommending secp256k1 in FIPS 186-5

Tony Arcieri <bascule@gmail.com> Thu, 19 December 2019 18:02 UTC

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From: Tony Arcieri <bascule@gmail.com>
Date: Thu, 19 Dec 2019 10:01:54 -0800
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To: Neil Madden <neil.e.madden@gmail.com>
Cc: Dan Burnett <daniel.burnett@consensys.net>, CFRG <cfrg@irtf.org>
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Subject: Re: [Cfrg] Recommending secp256k1 in FIPS 186-5
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On Thu, Dec 19, 2019 at 9:56 AM Neil Madden <neil.e.madden@gmail.com> wrote:

> But see
> https://datatracker.ietf.org/doc/draft-ietf-cose-webauthn-algorithms/ ...
>

I can't say I think too highly of a draft dated November 1st, 2019 which is
recommending only RSASSA PKCS#1v1.5 and ECDSA w\ secp256k1.

Especially in the case of the former this seems unwise given the lingering
history of BB'06 (which continues to cause real-world breakages... there
was a BlackHat talk about it this year
<https://i.blackhat.com/USA-19/Wednesday/us-19-Chau-A-Decade-After-Bleichenbacher-06-RSA-Signature-Forgery-Still-Works-wp.pdf>
)

-- 
Tony Arcieri

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