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Information Hiding in Probabilistic Concurrent Systems

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4 Author(s)
Andrés, M.E. ; Inst. for Comput. & Inf. Sci., Netherlands ; Palamidessi, C. ; van Rossum, P. ; Sokolova, A.

Information hiding is a general concept which refers to the goal of preventing an adversary to infer secret information from the observables. Anonymity and Information Flow are examples of this notion. We study the problem of information hiding in systems characterized by the presence of randomization and concurrency. It is well known that the raising of nondeterminism, due to the possible interleavings and interactions of the parallel components, can cause unintended information leaks. One way to solve this problem is to fix the strategy of the scheduler beforehand. In this work, we propose a milder restriction on the schedulers, and we define the notion of strong (probabilistic) information hiding under various notions of observables. Furthermore, we propose a method, based on the notion of automorphism, to verify that a system satisfies the property of strong information hiding, namely strong anonymity or no-interference, depending on the context.

Published in:

Quantitative Evaluation of Systems (QEST), 2010 Seventh International Conference on the

Date of Conference:

15-18 Sept. 2010

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