P2p Network Trust Management Technology Research

Trust management in P2P network is studied. Based on human behavior in real society, a scheme of trust acquisition is proposed in framework of Dempster-Shafer evidence theory. And a series of simulation are designed to evaluate the scheme. The simulation results show that the scheme is more stable in convergence, insensitive to threshold parameters, less on loss and advantageous to the new agent to join the network during emergence of virtual community. Based on this scheme, a trust management model is proposed by imitating the process of trust establishment in real society. The guiding meaning of trust value becomes the focus of attention and the whole P2P network is divided into many overlapped groups. The tust value of peer within P2P network is calculated by merging the trust value of peer within group, which combines the entire group's opinions and the valuator's individual attitude, and the trust value of group within network, which is calculated by global trust estimate arithmetic. Then a series of simulation are designed to evaluate the model. The simulation results show that the model makes fewer mistakes in searching target process, is more saft when malicious peers attack and pays out less loss in the process of network topology changing. In the end, trust subnet model, info-spread and bandwidth-share technology is briefly introduced as the next research work.