A Calculus for Secure Mobility

In this paper, we introduce the crypto-loc calculus, a calculus for modelling secure mobile computations that combine the concepts of locations, cryptography, and code mobility. All these concepts exist in mobile systems, for example, Java applets run within sandboxes or downloaded under an SSL connection. We use observational equivalence of processes as a powerful means of defining security properties, and characterize observational equivalence in terms of a labelled bisimilarity relation, which makes its proof much easier.