Research On Key Technologies Of Anonymous Communication Based On Peer-to-peer Network

To enhance the stability of channels in anonymous communication based on P2Pnetwork, an improved method for credit worthiness evaluation was proposed based onP2P network and Mix system in this thesis. A model and the prototype system of P2Panonymous communication were also established. This thesis proposed an improvedcredibility evaluation method and introduced it to the model of the anonymouscommunication system, which made a reference to construction of stable anonymouschannel.Firstly, an improved method for credit worthiness evaluation was introduced,aiming at the characteristics of nodes credit worthiness evaluation in P2P network.The time in communication is regarded as reference for the weight changes of thevector of creditworthiness. The empirical values and variation tendency of trustdegrees of the nodes were used to evaluate the current trust degrees of nodes, which isessentially different from traditional credit worthiness evaluation methods. Secondly,in the process of relay peers selection by evaluated trust degrees and distrust degrees,the anonymous services were classified to other demands for nodes requiringanonymous communication. Thirdly, multi-layer encryption and asymmetricencryption were implemented to accomplish packet transmission in communicationprocess. A variety of nodes behaviors were employed to validate the rationality of thismethod. In relay peers selection, the evaluation results show that high degree ofstability and low degree of ups and downs of nodes can be represented by high trustdegrees and low distrust degrees, respectively. Finally, the system design and functionmodule design of anonymous communication system based on P2P network wereconducted, and the prototype system was realized by using Java.