[Cryptography] Those Pxxx seeds? Came from lrand48
Anders Dalskov
anderspkd at fastmail.com
Mon Oct 19 02:44:07 EDT 2026
> Anthropic engineers using Claude figured out where the seeds for the
> “NIST Curves” came from. Full article at https://www.anthropic.com/
> research/ecdsa-curve-origins <https://www.anthropic.com/research/ecdsa-
> curve-origins> (public domain, nicely)
>
> Turns out it was lrand48 seeded with a then-current timestamp.
I love this.
Of all the (conspiracy) theories surrounding those curves, turns out the
most boring theory was the right one.
--
- Anders
More information about the cryptography
mailing list