On July 28th Anthropic announced new cryptanalytic attacks discovered using their LLM Claude Mythos: A key-recovery attack on HAWK, a post-quantum signature scheme candidate in NIST’s “Additional Digital Signatures” standardization project. Except for the toy version HAWK-256 whose 64-bit security is practically breakable, the new attack is not practical. But it's a meaningful break of HAWK’s security, as it reduces the estimated security level of HAWK-512 from its 128-bit target to at most 108 ...