Research On Several Vital Techniques Based On Trust For Peer-to-Peer Network

In recent ten years,P2P network(Peer-to-Peer network)has become one of the research hotspots in the field of network communication.What's more,related research data shows that data traffic of P2P applications has occupied a large proportion in the internet.The key techniques of P2P network,such as incentive mechanism,access control and secure routing,directly influence its availa-bility and efficiency of the system.So,it has certain theoretical significance and practical value to research them.1.Implementation of P2P network bases on this basic hypothesis that nodes wish share their resource,however,part of the nodes show more independence,they pay close attention to their own interests,without considering the whole network utility.The incentive mechanism is one of methods to ensure the credibility of shared resources,strengthen cooperation between nodes and improve the utilization rate of network system resources.Based on related researches on trust mechanism and infinitely repeated game,and the basic assumptions that nodes are rational and selfish,an incentive mechanism in peer to peer network based on trust is present.Through the establishment of the corresponding node behavior rule,punishing the selfish behavior of nodes,the incentive model encourages rational peers to constrain the selfish behavior from their own point of view,so as to improve the overall effectiveness of P2P network system.2.The traditional access control model is not suitable for P2P network the distributed management system,and the features opening and self-organization of P2P network brings a series of security risks to it.This paper proposes an access control mode of P2P network based on risk evaluation.Before the transaction would be generated between the nodes,firstly,the subject node evaluates asset value,and then analyzes the probability of the risk occurring,calculates the risk value of the transaction,finally,calculates the trust value of the transaction.In the model,by extending the task access control model and introducing the mechanism of trust evaluation into it,the dynamic management of the subject node to the object node is realized,so that,the goal of system security is achieved.Analysis and simulation show that the model is able to inhibit the success transaction rate of non cooperative nodes,increase the success transaction rate of the whole P2P network system,and improve the security of P2P network system.3.Secure and effective routing algorithm is one of vital technique for P2P network.However,the existing P2P routing algorithms don't take the secure problem into account,and choosing the next hop node randomly would decrease greatly the efficiency of routing.A secure routing algorithm of P2P based on trust cloud mode is proposed in the paper.It adopts trust and the quality of path to guide choosing of the next hop node,the secure and effective routing path is established,and the transmission of multipath and encryption can effectively restrain several typical security attacks such as tamper and tapping.The results of experiment show that the routing algorithm has high routing efficiency,good safety performance.