Research On Anonymity Communication Technology In Peer-to-Peer Network

As the rapid development of P2P network, it is no doubt that P2P gives us lots of benefits, it help us to enhance the network efficiency, take full advantage of network bandwidth and every nodes'potential with high expandability and good fault-tolerance performance. In a P2P network, it is very important to locate the resource efficiently. Chord is a great structural route algorithm, but the differences of nodes` performance affect the efficiency of whole system, and it needs huge expenditure to maintain a system where nodes are frequently entering and exiting.Anonymous communication becomes a very important research field as the great affect of internet, in brief, anonymous communication means hiding the identity of nodes involved in a communication and hiding the relationship of communication. In a number of P2P network with good efficiency, anonymous communication is always being ignored, which is a big shortcoming.This paper introduces basic concepts, mutual framework for P2P network and anonymous communication firstly, and then proposes G_Chord anonymous communication mechanism, which based on Chord system by using grouping nodes. A group has at most 8 nodes, instead of one node in former Chord system, we take full advantage of the high performance nodes, enhance query span of C_leader node, release the burden of query, and reduce the length of group node`s finger table, as a result we enhance the fault tolerance capibility and the query efficiency, reduce maintain expense. And then we add P2P anonymous framework to G_Chord systems, by using G_Chord grouping, based on the former G_Chord system, so the optimized G_Chord system has some anonymous attribute.Beyond the proved anonymous capibility, against the traffic analysis on message volume, this paper proposes a grouping padding approach, which based on the Mix anonymous communication mechanism. The algorithm analysis and emulation experience show that, comparing to traditional padding approach, our system can resist the traffic analysis of message volume and reduce the extra network bandwidth expenditure.