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[CFRG] Re: [hpke] Re: [lamps] Re: Re: Re: Re: [EXTERNAL] Re: Re: Re: Re: Re: Cross-testing update on LAMPS Composite and cfrg-concrete-hybrid-kems

Filippo Valsorda <filippo@ml.filippo.io> Tue, 04 November 2025 17:40 UTC

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Date: Tue, 04 Nov 2025 18:38:23 +0100
From: Filippo Valsorda <filippo@ml.filippo.io>
To: Nick Sullivan <nicholas.sullivan@gmail.com>, Dennis Jackson <ietf=40dennis-jackson.uk@dmarc.ietf.org>
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Subject: [CFRG] Re: [hpke] Re: [lamps] Re: Re: Re: Re: [EXTERNAL] Re: Re: Re: Re: Re: Cross-testing update on LAMPS Composite and cfrg-concrete-hybrid-kems
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2025-11-04 18:17 GMT+01:00 Nick Sullivan <nicholas.sullivan@gmail.com>:
> The stakeholders with the strongest preference for maintaining
> compatibility appear to be library implementers, who would likely need
> to add a new codepoint to their libraries to support existing non-IETF
> use cases and any RFC that relies on concrete hybrids as normative.
> Which is less than ideal, but maybe not catastrophic. The good news is
> that almost all existing implementations use the term X-Wing, X-Wing
> and X25519-MLKEM512 are very different names, so confusion may be
> minimal among users.

To be clear, and to echo David Benjamin, I am not saying that adding a codepoint for the incompatible CFRG variant would be confusing, I am saying I am not interested in shipping a needlessly incompatible variant of an already deployed construction at all.

Anyway, aside from whatever CFRG consensus is reached, I believe we do indeed need to have an IETF conversation around relying on CFRG documents as normative references, and around moving WG work at RG speeds.

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