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Measuring LLMs’ Ability to Perform Cryptanalysis

medschneierPublished 2026-07-29

<p>There&#8217;s new benchmark measuring AI&#8217;s ability to perform mathematical cryptanalysis. Anthropic&#8217;s frontier model actually found new attacks.</p> <p>The benchmark: &#8220;<a href="https://arxiv.org/pdf/2607.18538">CryptanalysisBench: Can LLMs do Cryptanalysis?</a>&#8221; The idea is to benchmark the ability of LLMs to discover new mathematical cryptanalytic attacks against a seri

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Original source: https://www.schneier.com/blog/archives/2026/07/measuring-llms-ability-to-perform-cryptanalysis.html