Anthropic's Claude Mythos Preview breaks post-quantum HAWK scheme and improves AES attack
Anthropic
Anthropic published research showing Claude Mythos Preview found a previously unknown attack that halves HAWK's post-quantum signature security margin, and a 200-800x faster attack on round-reduced AES, discovered in about 60 hours using a multi-agent research system. Anthropic also released CryptanalysisBench, built with ETH Zurich, Tel Aviv University, University of Haifa, and TU Berlin.
Why it matters
First public demonstration of AI-assisted cryptanalysis breaking meaningful security margins on schemes that survived years of expert human review, though Anthropic says no production systems are currently affected.
Importance: 4/5
Frontier lab (Anthropic) major research finding demonstrating AI-assisted cryptanalysis against real security margins.