Study Of Trust Evaluation Model And Strategy Based On P2P

The characteristics of random access to nodes in the P2 P network make the network take security risks.One of the important means to solve its security risks is to establish an effective trust evaluation model.The existing trust model has many problems such as the inability to dynamically update,the non-converge in the calculation,and the weakness in resisting malicious code attacks.An improved P2 P trust evaluation model MHRCT is proposed based on the HRCT model and the EigenTrust model,the research contents are as follows:MHRCT model with dynamic feedback on trust values is established.The related factors of P2 P network topology and the credit evaluation of nodes are analyzed.Based on analysis of HRCT and EigenTrust model,the trust strategy of nodes is formulated.The process of the trust evaluation of nodes is refined,and the index of credit evaluation is consummated.Dynamically dividing the node trading interval,adjusting the attenuation time of nodes according to the time period,and adding the time-sensitive function of the integrated trust value of nodes made the calculation of the trust evaluation function of nodes more reasonable.In order to realize the storage of the trust value and the optimization of reward and punishment for nodes of MHRCT model,Blockchain related technology is fused.The trust value of nodes is stored by Blockchain's head and its body.In MHRCT model,in addition to the measures of reward and punishment with a weighted penalty factor,the measures of reward and punishment are improved according to Blockchain.The concept of "mortgage" is introduced.The "mortgaging" is used to guarantee the behavior from the personal assets of nodes.The trust evaluation model MHRCT based on P2 P is compared with EigenTrust trust model and HRCT model by using PeerSim simulation tool.The test results show that the advantage of MHRCT model established in this paper is that the trust calculation is more accurate,and the success rate of nodes ' transactions is high and it can better resist malicious code attacks.To further verify the practicability of the model in this paper,a file sharing system based on the MHRCT model is designed and implemented.Taking file uploaded and download as an example,the application of the trust evaluation factor of the model in practice is analyzed.The analysis shows that the algorithm of the trust evaluation proposed by the MHRCT models provides a new solution to the security of the trust evaluation in the P2 P network.