Anthropic announced that its Claude Mythos Preview model discovered improved attacks against two cryptographic algorithms, though these results do not affect currently deployed systems. Regarding HAWK, a post-quantum digital signature scheme under evaluation by NIST, the key recovery cost for the smallest HAWK 256 configuration dropped from 2 to the power of 64 to 2 to the power of 38 operations, effectively halving the scheme’s key strength. For AES 128, Claude improved a meet-in-the-middle attack against the seven-round version using a method called Möbius Bridge, making the attack between 200 and 800 times faster than previous methods. Developing these attacks required approximately 60 hours using a multi-agent research system with an estimated cost of 100,000 dollars in API usage.
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