HAWK withdrawn from NIST's additional-signature process

What happened

The HAWK team withdrew its lattice signature scheme from round 3 of NIST's additional-signature process after Anthropic disclosed that its Claude model had recovered signing-equivalent keys from HAWK-256 challenge keys, halving the lattice-reduction block size the best prior attack needed. The team said the mitigations required would leave the scheme uncompetitive. NIST's finalised standards, ML-KEM, ML-DSA and SLH-DSA, are unaffected.