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Cryptol is a domain-specific language for specifying and verifying cryptographic algorithms. It's designed for high assurance through formal methods, enabling cryptographers and security engineers to write succinct mathematical specifications that can be formally verified or transformed into efficient implementations in other languages. Developed at Galois Inc., Cryptol provides a flexible environment for prototyping new cryptographic primitives while reducing the potential for implementation errors that could lead to vulnerabilities in real-world systems. Its type system reflects the structure of cryptographic algorithms, allowing users to express complex operations concisely with strong static guarantees provided by the compiler.

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