Yaroslav Rosomakho writes:
> BSI TR-02102-2 does not list X25519 as a recommended elliptic curve
Does it list P-256 or P-384 as recommended elliptic curves? In
https://www.bsi.bund.de/SharedDocs/Downloads/EN/BSI/Publications/TechGuidelines/TG02102/BSI-TR-02102-1.pdf?__blob=publicationFile&v=9
one finds Table B.3, "Recommended EC system parameters for asymmetric
schemes that are based on elliptic curves", listing only Brainpool
curves. Table C.1 makes an exception for Messaging Layer Security, but I
don't see a broader exception.
In other words: if the TR-02102-2 recommendations are a reason not to
use X25519 in TLS, then they're also a reason not to use P-256 in TLS.
---D. J. Bernstein
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