Abstract: Based on the assessment of relay node's security degree, a distributed protocol for multipath relay routing based on node's security degree (NSD-DPMRR) was proposed for P2P network. The best send rate of the source node and the best forward rate of the relay nodes can be computed with distributed method. The simulation shows that the protocol proposed will reduce the damage to the data transmission by malicious relay nodes,maximize the right data received by the destination node,and ensure the security and effectiveness of relay routing with lower complexity.

Key words: Peer-to-peer network, Multipath relay, Node strategy, Security degree