ULg Research Unit in Networking RUN

Model-Based Verification of a Security Protocol for the Conditional Access to Services

G. Leduc1 , O. Bonaventure1, E. Koerner1, L. Léonard1 and C. Pecheur1

1 Research unit in Networking, EECS department, University of Liège, Belgium



We use the formal language LOTOS to specify and verify the robustness of the Equicrypt protocol under design in the European OKAPI project for conditional access to multimedia services. We state some desired security properties and formalize them. We describe a generic intruder process and its modelling, and show that some properties are falsified in the presence of this intruder. The diagnostic sequences can be used almost directly to exhibit the scenarios of possible attacks on the protocol. Finally, we propose an improvement of the protocol which satisfies our properties.


Equicrypt, LOTOS, model checking, security protocols

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