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

Ilari Liusvaara <ilariliusvaara@welho.com> Thu, 10 March 2022 18:05 UTC

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Date: Thu, 10 Mar 2022 20:05:31 +0200
From: Ilari Liusvaara <ilariliusvaara@welho.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 Thu, Mar 10, 2022 at 12:41:16PM -0500, Mike Prorock wrote:
> +1 Mike - that is helpful.
> 
> Any thoughts of applying that in this case?  Seems like it would
> line up well with key types for the two main things in play here:
> 1) post quantum, hash based algorithms
> 2) post quantum, lattice based algorithms
> 
> This would also help on the implementation side as well per Ander's
> note

All of Falcon, Dilithium and SPHINCS+ use the same key format (this was
due to NISTPQC algorithm requirements). Which is byte string
public/private key, which would map to OKP in both COSE and JOSE.

As for mixing algorithms and keys, I think all wrong combinations are
guaranteed to blow up as key and signature sizes just do not match up.



-Ilari

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