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Article type: Research Article
Authors: Focardi, Riccardo; * | Rossi, Sabina
Affiliations: Dipartimento di Informatica, Università Ca' Foscari di Venezia via Torino 155, 30172 Venezia, Italy. E-mail: focardi@dsi.unive.it, srossi@dsi.unive.it
Correspondence: [*] Corresponding author.
Abstract: We study information flow security in the setting of mobile agents. We propose a sufficient condition to security named Persistent_BNDC. A process is Persistent_BNDC when every of its reachable states satisfies a basic Non-Interference property called BNDC. By imposing that security persists during process execution, one is guaranteed that every potential migration is performed in a stable, secure state. We define a suitable bisimulation-based equivalence relation among processes, that allows us to express the new property as a single equivalence check, thus avoiding the universal quantifications over all the reachable states (required by Persistent_BNDC) and over all the possible hostile environments (implicit in the basic Non-Interference property BNDC). We prove that Persistent_BNDC is a sufficient condition to the security of mobile agents by (i) giving a sound and complete characterization of Persistent_BNDC in terms of dynamic contexts, i.e., execution contexts that can non-deterministically change at run-time, abstractly modelling arbitrary migrations; (ii) showing that Persistent_BNDC implies information flow security when agent mobility is explicitly expressed in the calculus.
Keywords: Information flow, Non-Interference, process calculi, mobility, bisimulation
DOI: 10.3233/JCS-2006-14103
Journal: Journal of Computer Security, vol. 14, no. 1, pp. 65-110, 2006
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