On Fri, Oct 10, 2025 at 6:02 PM D. J. Bernstein <[email protected]> wrote:

> Andrei Popov writes:
> > There are regulatory requirements that require NIST curves, whether
> > one likes them or not.
>
> Can you please point to the "regulatory requirements" you have in mind,
> and explain why you believe that the requirements prohibit X25519MLKEM*?
>

Sadly BSI TR-02102-2 does not list X25519 as a recommended elliptic curve
and current text of TR-02102-1 is vague when it comes to acceptable
classical components of hybrids. I can only hope that at some point they
will issue a new revision clearly adding X25519MLKEM768 to the recommended
groups list.

Also worth keeping in mind that for most organisations these are
recommendations rather than requirements. But unfortunately way too many
read them as "what is not listed as recommended must be prohibited".

-yaroslav

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