Claude AI Just Cracked a Post-Quantum Test Scheme and Found a Faster 7-Round AES Attack
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Anthropic's AI model, Claude Mythos Preview, discovered a key-recovery attack against the HAWK-256 post-quantum signature scheme, exploiting a previously unused symmetry in its lattice structure. The attack reduces the effective security of HAWK-256 from 2^64 to 2^38 and enables full key recovery in about three hours on a 96-core server. Additionally, the model identified a 200- to 800-fold speedup in an attack on seven-round AES-128 by eliminating a 256-way guessing step using a novel 'Möbius Bridge' invariant. Neither finding impacts production systems, as HAWK-256 is a cryptanalytic challenge parameter and the AES attack requires an infeasible number of chosen plaintexts.
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