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Re: [COSE] draft-prorock-cose-post-quantum-signatures [Was: Re: Call for COSE Agenda Items for IETF 113 in Vienna]

Anders Rundgren <anders.rundgren.net@gmail.com> Tue, 08 March 2022 18:43 UTC

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Date: Tue, 8 Mar 2022 19:42:37 +0100
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To: Ilari Liusvaara <ilariliusvaara@welho.com>, cose@ietf.org
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From: Anders Rundgren <anders.rundgren.net@gmail.com>
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Subject: Re: [COSE] draft-prorock-cose-post-quantum-signatures [Was: Re: Call for COSE Agenda Items for IETF 113 in Vienna]
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On 2022-03-08 19:16, Ilari Liusvaara wrote:
<snip>
> 
> 
> And with regards to using one or different values of alg (differentiated
> by key), that is more complicated question. IIRC FIDO incorrectly
> assumes that alg values do not get reused, which causes problems with
> EdDSA which does reuse alg values (Ed25519 and Ed448 both use alg=-8 in
> COSE). On the other side, not reusing algorithm opens possibility for
> key-algorithm mismatches, which caused an infamous vulernabities in
> JOSE.

I believe most people (in retrospect) have rather come to the conclusion that polymorphic algorithms were a mistake.

Anders


> 
> 
> -Ilari
> 
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