A Multiple Level Security Access Control Mode of Peer-to-Peer Network based on Trust and Risk

摘要

The features opening and self-organization of P2P network brings a series of security risks to it, however the traditional access control model is not suitable for P2P network the distributed management system. This paper proposes a multiple level security access control mode of Peer-to-Peer network based on trust and risk. Firstly, the subject node evaluates the trust of object node by means of multidimensional trust cloud model, then calculates the risk value of this sharing transaction using the theory of risk evaluation and analytic hierarchy process, in the end, obtains the permission access degree of object node by synthesizing the trust of object node and the risk value of this sharing transaction. In the model, by extending the multiple level security mechanism, the subject node can dynamically manage the access authority of the target node according to the permission access degree of it. Analysis and simulation show that the model is able to inhibit the success transaction rate of malicious nodes, increase the success transaction rate of the whole P2P network system, and improve the security of P2P network system.