A new trust model based on advanced D-S evidence theory for P2P networks

Authors:
Chunqi Tian;Shihong Zou;Wendong Wang;Shiduan Cheng
Affiliations:
State Key Laboratory of Networking and Switching, Beijing University of Posts and Telecommunications, Beijing, P.R. China;State Key Laboratory of Networking and Switching, Beijing University of Posts and Telecommunications, Beijing, P.R. China;State Key Laboratory of Networking and Switching, Beijing University of Posts and Telecommunications, Beijing, P.R. China;State Key Laboratory of Networking and Switching, Beijing University of Posts and Telecommunications, Beijing, P.R. China
Venue:
FAST'06 Proceedings of the 4th international conference on Formal aspects in security and trust
Year:
2006

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Abstract

Building trust relationship between peers in a large-scale distributed P2P file-sharing system is a fundamental and challenging research topic. Recommendation based trust mechanism is widely employed to establish the trust relationship. However, most existing approaches can not efficiently deal with inconsistent or conflicting recommendation information, and uncertainty of information. Dempster-Shafer (D-S) evidence theory is preponderant in tackling uncertainty of information, but classical combination rule always results in unreasonable results especially when evidences severely conflict each other. In this paper, we improve the combination rule for D-S evidence theory and develop a novel trust model based on it. For the problem of security, some measures are also proposed to defense against several malicious attacks. Experimental results show that the proposed model can significantly improve the successful transaction rate of P2P networks and effectively detect malicious behaviors in P2P networks.