Anthropic says Claude Mythos found new attacks on HAWK as crypto markets rise ahead of the FOMC
Anthropic said an unreleased version of its flagship model, Claude Mythos Preview, discovered two previously unknown attacks on cryptographic algorithms, including one targeting HAWK, a post-quantum digital signature system that had advanced to the third round of the U.S. NIST competition. According to the report, the attack cuts the cost of stealing HAWK’s smallest key from 2^64 operations to 2^38, or about 67 million times less work. Anthropic said fixing the issue would roughly double key sizes, weakening one of HAWK’s main selling points: compact keys and fast signing. The report also stressed that HAWK has never been deployed and that Bitcoin still uses ECDSA, so no live crypto system was broken by the finding. Even so, the development matters because a broad push toward quantum-resistant crypto infrastructure assumes that the replacement schemes are themselves secure. The newsletter also covered a range of market and policy developments, including gains in BTC and ETH ahead of the FOMC, public backing for the CLARITY Act from BlackRock, Fidelity, Franklin Templeton, Goldman Sachs, and SoFi, fresh ETF flow data, Zcash’s Ironwood activation, and a burst of meme coin trading activity led by PIPEDOG on Robinhood chain.








