Discovering cryptographic weaknesses with Claude \ Anthropic

Anthropic researchers find weaknesses in cryptographic algorithms with Claude Mythos Preview

Frontier Red Team Discovering cryptographic weaknesses with Claude Jul 28, 2026 Summary Using Claude Mythos Preview, researchers at Anthropic have discovered improved ways to attack cryptographic algorithms (the mathematical methods used to keep online data private). The first attack significantly weakens HAWK, a digital signature scheme that was built for a post-quantum world. The second identifies a new way to attack round-reduced AES, the most widely used symmetric cipher. These are substantial research advances, but they do not currently affect any production systems. This post describes b

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