P2P Network Trust Model And Its Application In Anonymous Line Node Selection

With the widespread use of Peer-to-Peer Network in the areas of file distribution,instant messaging and anonymous communication,the subsequent network security issues has been widely concerned by the society.As one of the important mechanisms to deal with the security issues,the trust model arises in response to the proper time and conditions.Based on the existing Peer-to-Peer Network trust model research,this paper proposes a social psychology trust model for general Peer-to-Peer Network,a onion router trust model for particular Peer-to-Peer Network and applies it to the circuit selection mechanism of the anonymous network Tor.The main contents of this paper are as follows:First of all,this paper introduces the definition and characteristics,topology structure,anonymous characteristics and applications of Peer-to-Peer Network.Then briefly outlines the definition and characteristics of trust,introduces the types and key technologies of trust model,analyzes the evaluation index of trust model,and points out the problems of the current trust model.Furthermore,this paper proposes a trust model for Peer-to-Peer Network based on social psychology.This model not only draws on the three basic concepts of proximity,familiarity and similarity in social psychology to integrate into the relationship of human social interaction,it also includes mature trading relationship,trust learning factor,transaction density factor and similarity factor.Meanwhile,this paper gives the calculation method,storage method and manage method of the model trust value,In the end,this paper makes a experimental simulation of the trust model from three aspects,which are dynamic adaptability,fault tolerance and superiority.According to the operation principle of Tor,the onion router trust model for Tor is constructed.Integrated trust value based on objective trust constructed by OR node declaration and subjective trust constructed by the routers involved in the anonymous communication on the forwarding performance evaluation of each node in the line is weighted in this model.Moreover,the Tor node selection method based on the comprehensive trust value is designed.In the process of selecting the OR node,the trust value of the node and the principle of physical address avoidance are taken into account.Correlation analysis shows that the proposed model and node selection method can be used to increase the attack cost,and to some extent,the suppression effect is achieved.At the end of this paper,the research content is summarized,in order to provide reference and put forward prospects for future research.