| P2P technology is a new distributed network model which doesn't rely on the server. This model has been applied widely in areas such as peer-to-peer compute, information sharing, distributed search and so on. It realized the sharing of the network information and resources by the direct exchange between peers in the systems. In this network, all the peers are equal, and truly achieve equality communications between the networks. However, with the extensive and in-depth applications of the existing P2P system, its defects are exposed gradually. The performance of P2P systems cannot achieve the best condition theoretically. The main reasons are the unreliability of the service, security risk and attacks caused by malicious peers. These problems impose serious constraints on the cooperative relations between the users in the P2P system. In addition, co-operation between users in P2P systems is limited, and the most fundamental reason is lack of trust between users and effective cooperation mechanisms. So it cannot motivate users to participate in the system cooperation more actively. The anonymity, high degree of openness as well as the peer type, purpose and other factors led to peers'different action. The loss of trust between users leads to a severe damage to the performance of P2P network and hampers the further development of P2P network.In order to deal with the problems in P2P systems, a novel trust model MSL-TM based on the Multinomial Subjective Logic is proposed. The model uses multinomial ratings and Dirichlet distribution to compute the expectation of the Subjective opinion and accordingly draws the peer's reputation value and risk value, and finally gets the trust value. The decay of time, rating credibility and the risk value are introduced to reflect the recent behaviors of the peers and make the system more sensitive to malicious acts. Finally, the effectiveness and feasibility of the model is illustrated by the simulation experiment designed with Peersim. |
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