| The equality, open, anonymous characteristics of P2P network allows thepeers in the system to be not only consumers but also service providers; peerscan be freely in and out of the system and interact directly. With thesecharacteristics, electronic commerce based on P2P network develops rapidly,and consequently brings new reform. However, construction of the trustrelationship of the P2P electronic commerce system between peers is difficult,because of the lack of a central server to supervise and manage the behavior ofpeers. Therefore, how to establish an effective trust mechanism to help tobuild the trust relationship among peers in P2P E-commerce systems is animportant issue for the research of P2P E-commerce technology.Based on the analysis of the existing trust mechanism, this work proposed anew Trust Model, named EVTM, build in P2P E-commerce system based onevaluation vector. This model has three innovations. First, the modelintroduced an evaluation vector and weights of evaluation standard vector.The trust is described and evaluated effectively and prevents malicious peers’dynamic transforming their roles to improve trust, with the help of time decayfunction and reward and punishment mechanism, make peers more honestly.Second, only the peers which had direct transactions with target peer and hightrust degree was selected to send evaluation request, in order to preventirrelevant peers interfering the global trust degree. Third, the feedbackinformation return by recommend peers with the form of vector, which makesmore rich and near the truth, we calculate the indirect trust by AVG method,because AVG methods not only convergence quickly, but also do not needsecondary credit evaluation, avoids authentic feedback evaluation informationof recommend peers’.Simulations show that, the model can effectively evaluate the trust degreeof peers, identify and isolate the malicious peers, and be effectively applied in the P2P E-commerce system. |
