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On the Decidability of (ground) Reachability Problems for Cryptographic Protocols (extended version)

5 June 2009
Yannick Chevalier
Mounira Kourjieh
ArXiv (abs)PDFHTML
Abstract

Analysis of cryptographic protocols in a symbolic model is relative to a deduction system that models the possible actions of an attacker regarding an execution of this protocol. We present in this paper a transformation algorithm for such deduction systems provided the equational theory has the finite variant property. the termination of this transformation entails the decidability of the ground reachability problems. We prove that it is necessary to add one other condition to obtain the decidability of non-ground problems, and provide one new such criterion.

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