Discovering cryptographic weaknesses with Claude
Anthropic researchers used Claude Mythos to find mathematical flaws in HAWK and a weaker AES variant, though neither result has practical impact. The model worked 60 hours at ~$100,000 API cost, with human prompts encouraging it not to give up. The work produced CryptanalysisBench, a new evaluation for LLM cryptanalysis.
LLMs can now assist in cryptographic research, potentially automating discovery of mathematical weaknesses.


