Abstract:

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dimensional 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. TMDF 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.

Key words: trust model, deviation factor, selfcapacity, externalcapacity