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Safe Equivalences for Security Properties

Mário Alvim 1 Miguel Andrés 2 Catuscia Palamidessi 1 Peter van Rossum 2
1 COMETE - Concurrency, Mobility and Transactions
Inria Saclay - Ile de France, LIX - Laboratoire d'informatique de l'École polytechnique [Palaiseau]
Abstract : In the field of Security, process equivalences have been used to char- acterize various information-hiding properties (for instance secrecy, anonymity and non-interference) based on the principle that a protocol P with a variable x satisfies such property if and only if, for every pair of secrets s1 and s2 , P [s1 /x ] is equivalent to P [s2 /x ]. We argue that, in the presence of nondeterminism, the above principle relies on the assumption that the scheduler “works for the benefit of the protocol”, and this is usually not a safe assumption. Non-safe equivalences, in this sense, include trace equivalence and bisimulation. We present a formalism in which we can specify admissible schedulers and, correspondingly, safe ver- sions of these equivalences. We then show safe bisimulation is still a congruence. We conclude showing how to use safe equivalences to characterize information- hiding properties.
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Submitted on : Sunday, December 19, 2010 - 12:22:28 PM
Last modification on : Thursday, March 5, 2020 - 6:25:28 PM
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Mário Alvim, Miguel Andrés, Catuscia Palamidessi, Peter van Rossum. Safe Equivalences for Security Properties. 6th IFIP International Conference on Theoretical Computer Science (TCS 2010), Sep 2010, Brisbane, Australia. pp.55-70, ⟨10.1007/978-3-642-15240-5_5⟩. ⟨inria-00479674v2⟩

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