中文摘要：

针对现有对等（P2P）网络信任模型大多假设在一种理想的环境中，很少考虑节点内部和外部环境影响的问题，提出一种新的基于偏差因子的信任模型（TMDF）．TMDF通过引入内部能力和外部能力的概念，构造多维评价向量，参考了社会网络中信任关系的建立方法，分别从2个方面计算节点的可信度，通过引入偏差因子计算推荐节点的推荐可信度，最终根据直接信任和推荐信任计算综合可信度．分析和仿真结果表明，该模型可提供更为真实的信任服务，并对抵制诋毁、共谋等恶意行为具有良好的抗攻击性能．

英文摘要：

In the existing trust models of peer to peer network, the internal situations and external environments of nodes are not considered in the process of calculating the trust value that will affect the rationality and objectivity of models. To solve this problem effectively, a new trust model based on the deviation factor （TMDF） is proposed. Introducing the structure concepts of self-capacity and external-capacity, the model gives a multi-dimenslonal evaluation vector, it comes from construction approach of trust relations in the social network, in which, a peer＇ s trust value is calculated according to two aspects. TM- DF calculates the recommended trust value of the recommended nodes using the deviation factor and calculate the trust value of nodes by the direct trust value and the recommended trust value. Analysis and simulation show that the new model can provide the more real trust services, identify and resist the malicious acts, such as slander and conspirator.