Claude Mythos Preview Uncovers Critical Flaws in Two Major Cryptographic Algorithms

Anthropic revealed that their Claude Mythos Preview has identified significant mathematical vulnerabilities in two key cryptographic algorithms. The first vulnerability drastically reduces the effective key strength of HAWK, a post-quantum digital signature scheme currently being evaluated by NIST. The second flaw enhances the best-known attack against seven-round AES, a widely used symmetric encryption standard, by a factor of 200 to 800 times. These discoveries highlight overlooked weaknesses despite extensive expert review.