关键词: 点对点（P2P网络）, 动态性, 共谋攻击, 熵权法, 信任

Abstract: To solve the problems of dynamic characteristic, and deal with collusion attack in current P2P trust model, a new dynamic comprehensive trust model（DOGC trust） is proposed. It shares node equally to different group competition in logical based on global trust in this model. Weight and entropy are counted, local trust of node is updated, local trust’s standard deviation in group and node is calculated based on entropy method. Node is adjusted by dynamic optimization. That not only leads group’s weight in to the model for increasing the calculation accuracy, but also pays attention the similarity of node's behavior to strengthen the incentives strategy. The simulation and experimental results indicate that the new model has advantages in controlling dynamic characteristic of node, collusion attack and improving transaction success rate over the existing trust models.

Key words: Peer-to-Peer（P2P） network, dynamic characteristic, collusion attack, entropy method, trust