A novel dynamic trust model for P2P network

Since traditional centralized trusting mechanism can not adapt to the demand of P2P network, we need establish a distributed trusting mechanism to strength the reliability of system. The trust models focus o the members.. It divides P2P network into several overlapped groups with different functions and treats it as trust relationship of groups, trust relationship between groups and peers and trust relationship among peers in the same group. In one group，the evaluations among members come into being by combinations of history records of object peers written by members and individual experience of appreciators，also by amending these records according to differences of individuals’ abilities to remark. In P2P network，the trust evaluation between groups are obtained by using a method of global trust. At last，the trust degree of aimed peers is calculated by evaluations between members in the same group and trust evaluations between groups, then corresponding decision of trade can be made by the trust degree. The experiments in simulation have shown our model has strong ability for defending malicious peers and it has fewer errors in targets searching. It also costs little price in the re-convergence process when network topology changes. © Jian and Zhi.