The Common Authentication Protocol Specification Language (CAPSL) is high-level language for applying formal methods to the security analysis of cryptographic protocols. It's goal is to permit a protocol to be specific once in a form that is usable as an interface to any type of analysis tool or technique, given appropriate translation software. This paper describes the first operational CAPSL translator to the language used by the NRL Protocol analyzer (NPA), a software tool developed specifically for the analysis of cryptographic protocols.

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