There is no -06 on the data tracker yet. Please let me know when it's been
posted so I can take a gander at the diff.


On Tue, Jun 9, 2026 at 8:12 AM Kampanakis, Panos <[email protected]> wrote:

> Thx Kyle, addressed in -06. I did not address the first comment because it
> is the Introduction and the details are explained in the later section of
> the doc.
>
>
> -----Original Message-----
> From: Kyle Rose via Datatracker <[email protected]>
> Sent: Tuesday, June 9, 2026 1:00 AM
> To: [email protected]
> Cc: [email protected]; [email protected];
> [email protected]
> Subject: [EXTERNAL] draft-ietf-ipsecme-ikev2-mlkem-05 ietf last call
> Tsvart review
>
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>
>
> Document: draft-ietf-ipsecme-ikev2-mlkem
> Title: Post-quantum Key Exchange with ML-KEM in the Internet Key Exchange
> Protocol Version 2 (IKEv2) Reviewer: Kyle Rose Review result: Ready with
> Nits
>
> This document has been reviewed as part of the transport area review
> team's ongoing effort to review key IETF documents. These comments were
> written primarily for the transport area directors, but are copied to the
> document's authors and WG to allow them to address any issues raised and
> also to the IETF discussion list for information.
>
> When done at the time of IETF Last Call, the authors should consider this
> review as part of the last-call comments they receive. Please always CC
> [email protected] if you reply to or forward this review.
>
> This document is Ready with Nits.
>
> Nits:
>
> * "Other than combining the security of a well-established algorithm with
> relatively new quantum-resistant algorithms, another use of a PQ/T Hybrid
> key exchanges in IKEv2 is to prevent fragmentation of key exchanges with
> the high security parameter of ML-KEM which may not fit in common network
> packet payload sizes." It is unclear how the use of hybrid key exchanges
> results in ML-KEM parameters that allow the key share to fit within a
> typical MTU. (I can obviously guess, but this should nonetheless be
> clarified for those readers not intimately familiar with IKEv2 or RFC 9370.)
>
> Other comments:
>
> * It seems like the susceptibility of IKEv2 to downgrade attacks by active
> MitMs should be described and discussed in one place (and hopefully
> motivate the development of an IKEv3 not vulnerable to this kind of attack)
> rather than resulting in the same boilerplate in every document describing
> a new security parameter.
>
> * Is the information in appendix A required in order to implement this
> specification? It might be, but it's unclear on my reading. If it is
> required, then it should be in the main text of the document, not in an
> appendix.
>
>
>
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