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Compositional Methods for Information Hiding

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Niveau: Supérieur, Doctorat, Bac+8
Compositional Methods for Information-Hiding Christelle Braun, Konstantinos Chatzikokolakis, Catuscia Palamidessi INRIA and Ecole Polytechnique Protocols for information-hiding often use randomized primitives to obfuscate the link between the observables and the information to be protected. The degree of protection provided by a protocol can be expressed in terms of the probability of error associated to the inference of the secret information. We consider a probabilistic process calculus approach to the specification of such protocols, and we study how the operators affect the probability of error. In particular, we characterize constructs that have the property of not decreasing the degree of protection, and that can therefore be considered safe in the modular construction of protocols. As a case study, we apply these techniques to the Dining Cryptographers, and we are able to derive a generalization of Chaum's strong anonymity result. Finally, we consider the metric on processes defined by Desharnais et al., and we prove that the degree of protection is continuous with respect to the metric. Categories and Subject Descriptors: ... [...]: ... General Terms: ... Additional Key Words and Phrases: ... 1. INTRODUCTION During the last decade, internet activities have become an important part of many people's lives. As the number of these activities increases, there is a growing amount of personal information about the users that is stored in electronic form and that is usually transferred using public electronic means.

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ACADEMIE :NICE EXERCICE :2006
DATE : 06/03/06 PAGE :1
F118 - FRUITS ET LEGUMES FRAIS
F120 - LAIT-BEURRE
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