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AI Crypto Breakthrough Anthropic published the results of Claude Mythos Preview's work on two cryptographic tasks on July 28. The model helped recover the HAWK-256 key and accelerate an attack on a seven-round version of AES-128. Digital signatures confirm who signed a message or owns a digital certificate. HAWK was a NIST candidate for post-quantum signatures, with its security based on a lattice problem. The model found symmetry in HAWK that reduces the key recovery problem. Previous work had linked this symmetry to a possible attack, but it had not been found in the scheme itself. The team reduced the key search to finding a short vector in a space of roughly half the dimension and demonstrated complete recovery of the HAWK-256 key. In the second work, the model accelerated the cryptanalysis of seven-round AES-128 by 200-800 times. The previous method for each case iterated over 256 values of one byte of the key. Mythos proposed a Möbius Bridge fingerprint, which is the same for all these values, so one step of iteration disappeared. According to Anthropic, the search, development, and verification took around 60 hours and required approximately $100,000 in API expenses. The key idea emerged in three days, and Anthropic researchers spent hundreds of hours verifying and preparing the article, citing Nature Aging, July 2026. 🔗 Read original →