Some thoughts about Anthropic’s new cryptanalysis results https://blog.cryptographyengineering.com/2026/07/29/some-notes-about-anthropics-new-results Cryptography expert Matthew Green examines two new cryptanalysis results published by Anthropic and produced by its unreleased Claude Mythos model: an attack on the HAWK signature scheme and an improved attack on reduced-round AES. Green notes that the two results differ substantially in quality and significance. He provides technical context on each attack and cautions against over-interpreting the broader implications, including any immediate impact on deployed cryptography or cryptocurrency systems.