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[TLS] Re: Working Group Last Call for Post-quantum Hybrid ECDHE-MLKEM Key Agreement for TLSv1.3

Alicja Kario <hkario@redhat.com> Tue, 14 October 2025 14:55 UTC

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From: Alicja Kario <hkario@redhat.com>
To: Bas Westerbaan <bas=40cloudflare.com@dmarc.ietf.org>
Date: Tue, 14 Oct 2025 16:54:59 +0200
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Subject: [TLS] Re: Working Group Last Call for Post-quantum Hybrid ECDHE-MLKEM Key Agreement for TLSv1.3
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On Tuesday, 7 October 2025 18:28:01 CEST, Bas Westerbaan wrote:
> This is the breakdown of client support Cloudflare sees 
> (relative to any PQ support) in the last 24 hours by handshakes:
>
> 94% X25519MLKEM768
> 8.1% X25519Kyber768
> 0.038% MLKEM768
> 0.014% CECPQ2
> 0.012% MLKEM1024
> 0.002% SecP384MLKEM1024
> 0.002% SecP256MLKEM768
> 0.00005% MLKEM512
> 0.0000003% SecP256Kyber768

If anything, that's a symptom of the web browser monoculture and the
fact that people interested in conformance prefer deploying RFCs, not I-Ds

-- 
Regards,
Alicja Kario
Principal Quality Engineer, RHEL Crypto team
Web: www.cz.redhat.com
Red Hat Czech s.r.o., Purkyňova 115, 612 00, Brno, Czech Republic

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