Anthropic Says Claude Mythos Preview Found Weaknesses in Cryptographic Algorithms

(Getty Images) Anthropic researchers used Claude Mythos Preview to find new weaknesses in two cryptographic methods, the company said Tuesday, including one that is being considered by the National Institute of Standards and Technology for both traditional and quantum computing. In a blog post detailing the work, the frontier AI company called it a “substantial” research advancement, but also emphasized that neither flaw affects software now in use. “The attacks described in these two papers are the strongest attacks we have found to date,” the company wrote in the post. [...] Advertisement The other flaw was found in a weakened version of the Advanced Encryption Standard, or AES, the cipher NIST adopted in 2001 and the most widely used method for scrambling data in transit. Working largely on its own, Mythos invented a mathematical shortcut dubbed the “Möbius Bridge.” While real-world encryption scrambles data through 10 sequential layers, or “rounds,” researchers regularly st

Image 4: Avatar of anthropicai Anthropic•Yesterday New Anthropic research: Discovering cryptographic weaknesses with Claude. Claude Mythos Preview has helped our researchers find weaknesses in cryptographic algorithms—the mathematical methods that are used to keep data private. Read more: Anthropic has published research showing that Claude Mythos Preview, a new model variant, was used to discover weaknesses in cryptographic algorithms. The research demonstrates AI-assisted vulnerability discovery in the mathematical foundations of data privacy and encryption. Image 5: EthicalAds's image Visit P​r o​m​o​t e​d b​y E t​h​i c​a​l​A​d​s Build smarter search with MongoDB Atlas — your vector database for AI apps. Start free. Advertise here Image 6: PixelImage 7: Pixel [...] Anthropic researchers used Claude Mythos Preview to discover significant cryptographic weaknesses in two algorithms. The first attack improves on the best-known attack against HAWK, a post-quantum digital signat

# Discovering cryptographic weaknesses with Claude Discovering cryptographic weaknesses with Claude ## Summary Using Claude Mythos Preview, researchers at Anthropic have discovered improved ways to attack cryptographic algorithms (the mathematical methods used to keep online data private). The first attack significantly weakens HAWK, a digital signature scheme that was built for a post-quantum world. The second identifies a new way to attack round-reduced AES, the most widely used symmetric cipher. These are substantial research advances, but they do not currently affect any production systems. This post describes both findings in more detail and discusses the implications for cryptography in an age of powerful AI models. ## Introduction [...] ## Introduction When we launched Claude Mythos Preview, we showed it was able to autonomously find and exploit vulnerabilities in almost every piece of software we pointed it at. This included several major cryptographic libraries—shared col

Anthropic says its unreleased AI model Claude Mythos Preview has discovered hidden mathematical weaknesses in cryptographic algorithms that researchers had missed for years. The findings were detailed in two research papers focused on improving future cybersecurity. In one study the AI uncovered a flaw in HAWK a post quantum cryptography candidate leading to its withdrawal from consideration as a future security standard. In another the model developed a new mathematical shortcut that speeds up analysis of simplified versions of the Advanced Encryption Standard (AES) by 200 to 800 times.

View organization page for Anthropic 4,359,003 followers New Anthropic research: Discovering cryptographic weaknesses with Claude. Claude Mythos Preview has helped our researchers find weaknesses in cryptographic algorithms—the mathematical methods that are used to keep data private. Read more: Cryptanalysis with language models To view or add a comment, sign in View profile for Dr Ariful Hoque [...] Agree & Join LinkedIn By clicking Continue to join or sign in, you agree to LinkedIn’s User Agreement, Privacy Policy, and Cookie Policy. # Claude Finds Cryptographic Weaknesses View organization page for Anthropic 4,359,003 followers New Anthropic research: Discovering cryptographic weaknesses with Claude. Claude Mythos Preview has helped our researchers find weaknesses in cryptographic algorithms—the mathematical methods that are used to keep data private. Read more: Cryptanalysis with language models Arnab Chakraborty, graphic [...] Autonomous research is coming, for math,

Log inSign up ## Post user avatar New Anthropic research: Discovering cryptographic weaknesses with Claude. Claude Mythos Preview has helped our researchers find weaknesses in cryptographic algorithms—the mathematical methods that are used to keep data private. Read more: Open laptop with lock iconography showing on its inner screen Discovering cryptographic weaknesses with ClaudeFrom anthropic.com 5:16 PM · Jul 28, 20262.7MViews user avatar Anthropic @AnthropicAI Jul 28 Claude discovered weaknesses in a highly-secure digital signature scheme (used to verify identity digitally) and a well-known symmetric cipher (used to encrypt data). 115K user avatar Anthropic @AnthropicAI Jul 28 [...] user avatar Anthropic @AnthropicAI Jul 28 Mythos Preview did most of this work autonomously, with occasional human guidance. Each of the two results cost roughly $100,000 in API usage. We disclosed the findings in advance to the algorithms’ authors,