Chord: A scalable peer-to-peer lookup service for internet applications
Proceedings of the 2001 conference on Applications, technologies, architectures, and protocols for computer communications
Managing trust in a peer-2-peer information system
Proceedings of the tenth international conference on Information and knowledge management
Choosing reputable servents in a P2P network
Proceedings of the 11th international conference on World Wide Web
A survey of trust and reputation systems for online service provision
Decision Support Systems
Simplification and analysis of transitive trust networks
Web Intelligence and Agent Systems
Foundations of security analysis and design IV
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Reputation systems for Peer-to-Peer (P2P) networks are relatively new. Most of the existing systems are centrally controlled hence raising scalability issues and single points of failure. In this paper we present a completely decentralized reputation scheme for P2P networks. The system is based on a certificate, RCert, which is a document that resides on a participating P2P node, which consists of information ratings collected from previous transactions with other peers. Central to the scheme is the concept of Public Key Infrastructure (PKI), upon on which much of the mechanism is based. In order to facilitate updates of RCert certificates, we present two protocols, RCertP and RCertPX. RCertP does not prevent the node from using older copies of RCert. An extended version, RCertPX, solves this problem by keeping track of the latest timestamp.