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Mythos Attack on 3rd-Round PQC Algorithm Candidate Puts It Out of Commission

Summary by Ars Technica
A quantum-resistant cryptography algorithm that was under consideration to become an official US standard has been taken out of the running after an Anthropic security model helped find a flaw that rendered it broken. The algorithm taken out of commission is known as HAWK. It's a digital signature scheme designed to withstand future attacks from quantum computers. HAWK had survived two rounds of testing by NIST (the National Institute of Standar…

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Claude Mythos Preview led an attack that led the designers of HAWK, a post-quantum digital signature mechanism, to withdraw their application from the standardization contest organized by the NIST. Language models have so far found programming errors in cryptographic libraries, they are now reaching the mathematical flaws of the algorithms themselves. [...] The post IA cryptanalysis shakes post-quantum migration by weakening cryptographic algori…

With AI Claude, Anthropic has searched for vulnerabilities in cryptoal algorithms. She found a post-quantum crypto candidate.

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Anthropic, the direct competitor of OpenAI on AI models, published yesterday a research post that made a lot of noise: his model Claude Mythos Preview found in 60 hours a weakness in HAWK, a post-quantum signature scheme that two years of human rereading had not found. Post-quantum cryptography is these new algorithms designed to resist future quantum computers, which could one day break part of the current encryption. NIST, the American organiz…

Anthropic has developed two new cryptoanalytic attacks with its AI model Claude Myth Preview. According to Anthropic, Claude Myth Preview has developed a previously unknown attack for complete key recovery against HAWK-256, a challenge parameter of the post-quantum signature process HAWK. HAWK is one of nine procedures that the US standardization institute NIST introduced into the third round of its selection process for post-quantum signatures …

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TFTC broke the news on Tuesday, July 28, 2026.
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