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Anthropic's Claude Mythos Uncovers Flaws in Post‑Quantum HAWK Signature Scheme and Reduced‑Round AES
Key Points
- Claude Mythos halved the effective key strength of the post‑quantum HAWK signature scheme.
- The model sped up the best known attack on seven‑round AES by 200‑800 times.
- Both discoveries cost roughly $100,000 each in compute resources.
- HAWK is not deployed; the AES attack targets a reduced‑round variant, not the full cipher.
- Anthropic disclosed the findings responsibly, coordinating with NIST and U.S. officials.
- A new benchmark, CryptanalysisBench, was released with academic partners to gauge AI cryptanalysis.
- Follow‑up attacks include practical exploits against LEA, Serpent‑128, Salsa20, Poseidon and SHA‑1.