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Réputation et respect de la vie privée dans les réseaux dynamiques auto-organisés

Paul Lajoie-Mazenc 1, 2
1 CIDRE - Confidentialité, Intégrité, Disponibilité et Répartition
CentraleSupélec, Inria Rennes – Bretagne Atlantique , IRISA-D1 - SYSTÈMES LARGE ÉCHELLE
Abstract : Reputation mechanisms are very powerful mechanisms to foster trust between unknown users, by rewarding good behaviors and punishing bad ones. Reputation mechanisms must guarantee that the computed reputation scores are precise and robust against attacks; to guarantee such properties, existing mechanisms require information that jeopardize users' privacy: for instance, clients' interactions might be tracked. Privacy-preserving reputation mechanisms have thus been proposed, protecting both clients' privacy and the providers' one. However, to guarantee strong privacy properties, these mechanisms provide imprecise reputation scores, particularly by preventing clients to testify about their negative interactions. In this thesis, we propose a new distributed privacy-preserving reputation mechanism allowing clients to issue positive as well as negative feedback. Such a construction is made possible thanks to tools from the distributed systems community -- distributed third parties that allow for a distribution of trust and that tolerate malicious behaviors -- as well as from the cryptographic one -- for instance zero-knowledge proofs of knowledge or anonymous proxy signatures. Furthermore, we prove that our mechanism guarantees the required privacy and security properties, and we show with theoretical and practical analysis that this mechanism is usable.
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Paul Lajoie-Mazenc. Réputation et respect de la vie privée dans les réseaux dynamiques auto-organisés. Cryptographie et sécurité [cs.CR]. Université Rennes 1, 2015. Français. ⟨NNT : 2015REN1S039⟩. ⟨tel-01232139⟩

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