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

Alicja Kario <hkario@redhat.com> Mon, 20 October 2025 17:13 UTC

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From: Alicja Kario <hkario@redhat.com>
To: Simon Josefsson <simon=40josefsson.org@dmarc.ietf.org>
Date: Mon, 20 Oct 2025 19:11:25 +0200
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Subject: [TLS] Re: Working Group Last Call for Post-quantum Hybrid ECDHE-MLKEM KeyAgreement for TLSv1.3
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On Monday, 20 October 2025 17:57:33 CEST, Simon Josefsson wrote:
> Alicja Kario <hkario=40redhat.com@dmarc.ietf.org> writes:
>
>> If that classical part was good enough to be MTI and stay as
>> Recommended now, it should be good enough to be part of the hybrids
>> too.
>
> I disagree with that, if you imply that the P256 hybrid should be MTI.
>
> So if old DSA was still MTI we have to make DSA + ML-DSA MTI too?

We're not discussing if any of the hybrids should be mandatory to 
implement.
And what is the purpose of discussing alternative timelines where DSA is
dominant?

> I think we should make decisions about P256+MLDSA based on today's
> knowledge about P256 and MLDSA (and the combiner) rather than having
> necessarily make decisions that use earlier decisions on P256 as a least
> common denominator (i.e., MTI).

And what did fundamentally change since the P-256 was marked as MTI and
both it and secp384r1 curve were marked as Recommended?
-- 
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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