University of Birmingham > Talks@bham > Computer Security Seminars > Quantitative analysis of opacity

Quantitative analysis of opacity

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If you have a question about this talk, please contact Vincent Cheval.

Opacity is a general approach for describing and unifying security properties expressed as predicates. A predicate is opaque if an observer of the system is unable to determine the satisfaction of the predicate in a given run of the system. The meaning of opacity is straightforward when considering the standard (qualitative) operational semantics, but there are a number of possible interpretations in a context where quantitative information about system evolutions is available. We propose four variants of quantitative opacity defined for probabilistic labelled transition systems, with each variant capturing a different aspect of quantifying the opacity of a predicate. Moreover, we present results showing how these four properties can be checked or approximated for specific classes of probabilistic labelled transition systems, observation functions, and system predicates.

This talk is part of the Computer Security Seminars series.

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