The Research Of Trust Management Model Based On Fuzzy Set In Peer-to-Peer Network

Peer-to-peer network is a technology of network which is developed in recent years. At present it has been used in many online areas, and fast became a focus and hotspot of network research and attention. However, during the development and grandness process in peer-to-peer network, there also produce many problems needed to be studied and solved. And the most commonly and important questions are safe and resource contribution problems. The technology of trust-management model is a mainly aspect for solving the secure problem of peer-to-peer network. Although both at home and abroad, there are many researches for the technology of trust management model and obtain some achievement at present. But there are still some shortages, such as no trust enough and recommend incorrect, limited contribution and so on.Based on the analysis and research of existing trust models, this paper proposed a trust management model based on fuzzy set. And bring punish mechanism into the model. The whole trust model according to the reality of status divide the trust into two kinds: subjective credibility and objective credibility. We use fuzzy set method to respectively calculate. Again the calculated results weighted accumulate, the calculated results weighted accumulate, thus obtain the final trust. For the subjective credibility, the trust evaluate quantitatively calculated which use fuzzy relation in fuzzy set and the number according to one's own records and other nodes of historical evaluation and trust recommended calculation. For objective credibility, we have the following several steps. First, we list and sort the factors which can influence credibility assessment of the objective environment. Second, we quantified all types of factors. Third, quantification of various factors weighted, by using fuzzy set method for these factors is calculated, and then obtains the objective value of objective environment factors. This model bring up a punish mechanism in management after calculation of comprehensive values which can promote node user actively and honest trading in network.This model relative to the existed research, not only calculate subjective credibility with fuzzy sets method, moreover, the objective environment factors which influenced are full use of fuzzy sets method to calculate. At last, synthesize man-made and objective influence. Finally, simulations show that the trust model can effectively promote nodes trust relationships in the peer-to-peer network and make barter more securely and positivity.