Study on Trust Model in P2P

P2P is lack of immunity to several kinds of attacks because of his open and dynamic characteristics. So it is important to construct a safe and reliable trust model. The trust model in P2P can be divided into two groups according to the aggregation of trust value: Local Trust Model and Global Trust Model. Global Trust Model can efficiently restrain cheating from individual node and collaborative cheating from some malicious groups. We compared the current classical Trust Models from the aspects of the computing and the storage management of trust value, based on which we proposed the exiting problems in those Models and research strategy in the future study.