Anthropic’s Claude AI cracks weaknesses in post-quantum digital signature scheme in 60 hours

Anthropic's Claude Mythos AI model autonomously identified vulnerabilities in HAWK, a candidate post-quantum digital signature scheme, in 60 hours—a task that took human cryptographers two years. The AI also accelerated attacks on a reduced AES variant by 200 to 800 times, with each discovery costing approximately $100,000 in compute. Anthropic responsibly disclosed the findings to the cryptographic method developers and government partners.

Via cnet.com Anthropic’s Claude AI cracks weaknesses in post-quantum digital signature scheme in 60 hours What took human cryptographers two years took an AI model less than three days, raising serious questions for the crypto industry's encryption future Anthropic’s Claude Mythos model autonomously identified vulnerabilities in HAWK, a candidate for post-quantum digital signature schemes, halving its effective key strength after just 60 hours of analysis. The same process took human experts roughly two years of review. The AI model didn’t stop at HAWK. Claude Mythos also accelerated attacks on a reduced variant of the AES symmetric cipher by 200 to 800 times, demonstrating that its cryptographic analysis capabilities extend well beyond a single algorithm family. Each discovery cost approximately $100,000 in compute. HAWK matters because it’s a candidate in the ongoing global effort to develop post-quantum cryptography, algorithms designed to withstand attacks from future quantum computers. Finding weaknesses in these candidates now, before they’re widely deployed, is exactly what the security community needs. Anthropic says it responsibly disclosed the findings to both the developers of the affected cryptographic methods and government partners. Now, to be clear: Claude didn’t break Bitcoin’s encryption or Ethereum’s signing scheme. HAWK is a different algorithm entirely, and the AES variant that was attacked was a reduced version, not the full-strength cipher. NIST has been running a multi-year competition to standardize post-quantum algorithms, and HAWK was among the candidates under consideration. The $100,000 per discovery price tag is worth contextualizing. That’s roughly what a mid-level security researcher costs for a few months of work, not even accounting for the years of education and specialization required. Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy https://cryptobriefing.com/editorial-policy/ .