A Formalization of Strand Spaces in Coq Public
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In this paper we formally prove the correctness of two theorems about cryptographic protocol analysis using the Coq proof assistant. The theorems are known as the Authentication Tests in the strand space formalism. With such tests, we can determine whether certain values remain secret so we can check whether certain security properties are achieved by a protocol. Coq is a formal proof management system. It provides a formal language to express mathematical assertions, mechanically checks proofs of these assertions. Coq works within the theory of the calculus of inductive constructions. We first formalize strand spaces by giving definitions in Coq of the basic notions. Then we express the two authentication tests and give constructive proofs for them.
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