Abstract: Reputation system is the key approach to fight against the trust crisis of Peer-to-Peer networks. A novel reputation model based on swarm evolution was proposed in this article. In the model, the Peer-to-Peer network is viewed as social ecosystem, the process of reputation evaluation is modeled as an evolutionary process for peers. By using the strategy of crossover and sclection,the peers can rapidly and efficiently evaluate the trust value of potential partners,and finally improve the ability of their fitness. In order for verifying its performance, a simulation experiment for this model was also provided.

Key words: Peer-to-Peer networks, Reputation model, Swarm, Evolution