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[TLS] Re: WG Last Call: draft-ietf-tls-mlkem-05 (Ends 2025-11-26)

Simon Josefsson <simon@josefsson.org> Mon, 24 November 2025 15:13 UTC

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From: Simon Josefsson <simon@josefsson.org>
To: draft-ietf-tls-mlkem@ietf.org, tls-chairs@ietf.org, tls@ietf.org, Sean Turner <sean@sn3rd.com>
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Date: Mon, 24 Nov 2025 16:11:42 +0100
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Subject: [TLS] Re: WG Last Call: draft-ietf-tls-mlkem-05 (Ends 2025-11-26)
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I'm opposed to publishing this document through the TLS WG as-is.

At this time, I believe that non-hybrid PQ KEMs are a security risk.

Having Informational/Experimental documentation of deployed protocols is
reasonable.  However, there should be no urgency to publish this
document.  Thus I suggest to not publish it now.

We are having trouble getting safe hybrid PQ solutions published.  Until
we have a couple of widely deployed hybrid PQ KEMs published,
implemented and deployed, I don't think we should fragment the already
thin resources we have to reach that goal by spending further cycles on,
and then publish a fragile solutions like this.  Please prioritize a
non-NIST/MLKEM hybrid PQ KEM for TLS.  FrodoKEM?  Streamlined NTRU
Prime?  We need more hybrid PQ options.

/Simon

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