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Hindawi Publishing Corporation Advances in Multimedia

Summary: Hindawi Publishing Corporation
Advances in Multimedia
Volume 2007, Article ID 92485, 14 pages
Research Article
Globally Decoupled Reputations for Large
Distributed Networks
Gayatri Swamynathan, Ben Y. Zhao, Kevin C. Almeroth, and Haitao Zheng
Department of Computer Science, University of California, Santa Barbara, CA 93106, USA
Received 8 March 2007; Accepted 7 June 2007
Recommended by Shigang Chen
Reputation systems help establish social control in peer-to-peer networks. To be truly effective, however, a reputation system should
counter attacks that compromise the reliability of user ratings. Existing reputation approaches either average a peer's lifetime rat-
ings or account for rating credibility by weighing each piece of feedback by the reputation of its source. While these systems improve
cooperation in a P2P network, they are extremely vulnerable to unfair ratings attacks. In this paper, we recommend that reputation
systems decouple a peer's service provider reputation from its service recommender reputation, thereby, making reputations more
resistant to tampering. We propose a scalable approach to system-wide decoupled service and feedback reputations and demon-
strate the effectiveness of our model against previous nondecoupled reputation approaches. Our results indicate that decoupled
approache significantly improves reputation accuracy, resulting in more successful transactions. Furthermore, we demonstrate the
effectiveness and scalability of our decoupled approach as compared to PeerTrust, an alternative mechanism proposed for decou-


Source: Almeroth, Kevin C. - Department of Computer Science, University of California at Santa Barbara
Zhao, Ben Y. - Department of Computer Science, University of California at Santa Barbara


Collections: Computer Technologies and Information Sciences