UPRIDE: An Improved PRIDE Reputation Model In P2P Environment

P2P network is a newly emerging computing model succeeding conventional client/server(C/S)model.Every peer node in P2P network is equal,which acts as both a client and a server.Particular,the P2P networks are with the absence of central control and global information.The characters of open and distributed are the most important advantages of P2P network,but which also bring a challenge to P2P.Since P2P evironment is open and dynamic in nature,trust mechanisms in social networks can be used to build trust in peers for safeguarding interactions.The main work of this paper is to put forward to a P2P secuity model ased on trust and reputation ,on the basis of the research of the evelopment of the P2P network and the existing P2P security model PRIDE. Many selfish mobile peers consume much resource without any contribution in mobile P2P network.Considering the limitation of network resource and selfishness of peers,And on the basis of incentive mechanism, This paper represent an improved reputation model named UPRIDE.The dissertation focuses on this problem, and makes these contributions:1. A comprehensive survey of trust models in P2P environments is made. The newly-proposed models are analyzed, classified and compared.2. On the basis of inexistence incentive mechanism problem in the Classic reputation model named PRIDE system. this paper proposed a cooperative incentive mechanism based on game theory.The mechanism provided peers with different network'S service quality according to their contribution and therefore every peer was encouraged to cooperate with others or share their resource.Simulation and analysis results show that the self-meterage incentive mechanism offered by UPRIDE can deal with the"free riding"problem and encourage the cooperation among the peers and improve the network performance more efficiently.