I’ve been working on a hobby project to crack classical ciphers. The guts of it is to see whether frontier LLMs, given the right tools, can do a good job cracking a broad range of historical ciphers. github.com/matthewdgree...
AI Weekly's analysis
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- Cryptographer Matthew D. Green released Decipher, an open-source toolkit that cracks classical ciphers via CLI, an MCP server, or an agentic LLM loop.
- The toolkit bundles Rust-accelerated simulated annealing solvers covering substitution, Vigenère, Quagmire, transposition and composite pipelines under GPLv3.
- Its README explicitly instructs AI agents not to fetch or build external frameworks like cDecryptor, AZdecrypt or zkdecrypto during tasks.
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