Claude traces the origins of NIST ECDSA curve seeds

Anthropic says an internal research model, Claude, identified the origin of the long-debated seed values behind several NIST ECDSA curves, finding they were generated from a weak C library pseudorandom number generator seeded by Unix timestamps. The company said the finding closes a years-long mystery around a widely used cryptographic standard and does not indicate a cryptographic break or new weakness in ECDSA. In a post published Friday, 16 October 2026, Anthropic said the NIST P-192, P-224, P-256, P-384 and P-521 seeds were not hashes of hidden phrases, as some researchers had suspected, but outputs of the C library's lrand48…

Source: Blockchain.News