Thanks Songbo, both fixed in -06.

From: Songbo Bu <[email protected]>
Sent: Monday, June 1, 2026 9:19 PM
To: [email protected]
Cc: [email protected]
Subject: [EXTERNAL] [IPsec] Re: Last Call: 
<draft-ietf-ipsecme-ikev2-mlkem-05.txt> (Post-quantum Key Exchange with ML-KEM 
in the Internet Key Exchange Protocol Version 2 (IKEv2)) to Proposed Standard


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Hi,

I reviewed draft-ietf-ipsecme-ikev2-mlkem-05 from an implementer and 
operational-readability perspective. I support publication as Proposed Standard.

The draft is clear about how ML-KEM public keys and ciphertexts are carried in 
IKEv2 Key Exchange payloads, the need to follow the FIPS 203 recipient tests, 
and the PMTU/reliable-transport considerations for ML-KEM-768 and ML-KEM-1024 
in IKE_SA_INIT.

Two very small editorial nits, if a -06 is already being prepared:

  *   Section 1.1, Encaps bullet: s/intiator/initiator/
  *   Section 2, opening paragraph: s/where the the initiator’s/where the 
initiator’s/

Neither affects publication readiness.

Best,
Songbo Bu

On Mon, 01 Jun 2026 10:14:14 -0700, The IESG 
[email protected]<mailto:[email protected]> wrote:

The IESG has received a request from the IP Security Maintenance and
Extensions WG (ipsecme) to consider the following document: - ‘Post-quantum
Key Exchange with ML-KEM in the Internet Key Exchange
Protocol Version 2 (IKEv2)’
as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
[email protected]<mailto:[email protected]> mailing lists by 2026-06-15. 
Exceptionally, comments may
be sent to [email protected]<mailto:[email protected]> instead. In either case, please 
retain the beginning
of the Subject line to allow automated sorting.

Abstract

NIST standardized ML-KEM, a new key encapsulation mechanism, which
can be used for quantum-resistant key establishment. This draft
specifies how to use ML-KEM by itself or as an additional key
exchange in IKEv2 along with a traditional key exchange. These
options allow for negotiating IKE and Child SA keys which are safe
against cryptographically relevant quantum computers.

The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-ipsecme-ikev2-mlkem/

The following IPR Declarations may be related to this I-D:

https://datatracker.ietf.org/ipr/7227/

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