Anthropic Uses Claude to Unravel the Mystery of NIST ECDSA Curve Seeds

Anthropic's team had an internal research model identify the origins of the seeds for curves including NIST P-192, P-224, P-256, P-384, and P-521 in under half an hour: rather than hash outputs, they were outputs from the C library's lrand48 random number generator initialized with Unix timestamps. P-256, for example, required 1842 iterations.