
HAWK Lattice Signature Scheme Withdrawn from NIST Round 3 After AI-Assisted Key-Recovery Attack
An improved key-recovery attack discovered primarily by Anthropic’s Claude Mythos Preview led the HAWK team to withdraw the lattice-based signature scheme from NIST’s third-round additional signatures process within roughly 17 hours of public disclosure. The attack applies known lattice techniques more thoroughly than prior human review and does not affect finalized standards ML-KEM or ML-DSA. The rapid timeline underscores why measured crypto-agility forms a practical component of post-quantum migration planning.






