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We embed an untyped security protocol model in the interactive theorem prover Isabelle/HOL and derive a theory for constructing proofs of secrecy and authentication properties. Our theory is based on two key ingredients. The first is an inference rule for enumerating the possible origins of messages known to the intruder. The second is a class of protocol-specific invariants that formalize type assertions about variables in protocol specifications. The resulting theory is well-suited fordoi:10.3233/jcs-2012-0455 fatcat:5xtucgogtzbothxyctpxb5tg4m