Research And Design Of Multilevel Secure Access Control Model In P2P Network

At present,all kinds of applications based on technology of P2 P network are very extensive.However,the features of self-organization,anonymity and openness in P2 P network system bring some hidden danger to it,which seriously restricts the further development of P2 P network system.In the distributed management system such as P2 P network,how to study and design an effective access control model is one of the most important topics in the research of P2 P network system.In essence,P2 P network is a distributed overlay network based on the Internet,and the nodes can directly work together and share resources.Access control is an important means of maintaining network security and protecting network resources.It can ensure that network resources are not being illegally used and accessed.However,the traditional access control model can not be fully applied to the distributed management system such as P2 P network.Similar to the role of social network,trust evaluation and risk assessment are the basis for implementing security protection decisions and measures in network system.They can regulate behaviors between individuals to improve network security and reliability.Currently,one of the most widely used strategies in various security systems is multi-level security policy,which is an important means of access control,and can meet the security requirements of access control in such a distributed system such as P2 P network.Therefore,a multilevel secure access control model based on Degree of permission access in P2 P network in this paper presented.In this model,the direct trust cloud and the recommendation trust cloud are integrated to build the multi-dimensional trust cloud model,and the subject node carries on the trust evaluation to the object node through the multi-dimensional trust cloud model.What is more,the risk assessment theory and the analytic hierarchy process are used to calculate the expected risk value of this sharing interaction.Then,the degree of permission access of the object node is obtained on both the trust value of the object node and the risk of this interaction.The multilevel security strategy is extended in this model,and the subject node can manage the access rights dynamically according to the degree of permission access of the object node.Finally,theoretical analysis and experimental results show that this model can inhibit the success interaction rate of non cooperative nodes,increase the success interaction rate of the whole network system,and improve the security of P2 P network system.This paper provides a new scheme for th e establishment of access control model in P2 P network,which is a useful attempt to solve the problem of P2P network security.