# Some thoughts about Anthropic's new cryptanalysis results

DevFeed: [Some thoughts about Anthropic's new cryptanalysis results](<https://devfeed.tech/articles/some-thoughts-about-anthropic-s-new-cryptanalysis-results-29098.md>)

Original publisher: [Read original article](<https://blog.cryptographyengineering.com/2026/07/29/some-notes-about-anthropics-new-results/>)

Author: Matthew Green

Published: 2026-07-29T14:23:30Z

Content type: opinion

Language: en

Sources: [Matthew Green](<https://devfeed.tech/sources/matthew-green.md>)

Topics: [Cryptography](<https://devfeed.tech/topics/cryptography.md>), [Claude](<https://devfeed.tech/topics/claude.md>), [anthropic](<https://devfeed.tech/topics/anthropic.md>), [Post-Quantum](<https://devfeed.tech/topics/post-quantum.md>), [Algorithm](<https://devfeed.tech/topics/algorithm.md>)

Tags: [academics](<https://devfeed.tech/tags/academics.md>), [ai](<https://devfeed.tech/tags/ai.md>), [algorithm](<https://devfeed.tech/tags/algorithm.md>), [anthropic](<https://devfeed.tech/tags/anthropic.md>), [artificial-intelligence](<https://devfeed.tech/tags/artificial-intelligence.md>), [attacks](<https://devfeed.tech/tags/attacks.md>), [chatgpt](<https://devfeed.tech/tags/chatgpt.md>), [claude](<https://devfeed.tech/tags/claude.md>), [llm](<https://devfeed.tech/tags/llm.md>), [post-quantum](<https://devfeed.tech/tags/post-quantum.md>), [research](<https://devfeed.tech/tags/research.md>), [security](<https://devfeed.tech/tags/security.md>), [technology](<https://devfeed.tech/tags/technology.md>), [thoughts](<https://devfeed.tech/tags/thoughts.md>)

## AI overview

The article offers commentary on two cryptanalysis results published by Anthropic and produced by Claude Mythos: an attack on the proposed HAWK post-quantum signature scheme and an improved attack on reduced-round AES. It emphasizes that the HAWK attack targets a non-deployed, non-standardized scheme and demonstrates a weakness using a weakened challenge instance.

## Source excerpt

Yesterday Anthropic published two new cryptanalysis results, both outputs of Claude Mythos, their (still) unreleased advanced model. The first of these results attacks a signature scheme called HAWK, while the second is an improved attack against reduced-round AES. Anthropic also released a blog post describing the research process that produced these results. A few people ... Continue reading Some thoughts about Anthropic's new cryptanalysis results ->