[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


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