Abstract: The more along with the wide application of P2P system, the more it will face some severe trust problems such as service faking and resource abusing by some malicious peers. The conventional security measures cannot be used to cater for this demand, whereas the reputation based trust model has given a key to them. Firstly, the relationship between trust and reputation was analyzed, and a basic running framework for the reputation based trust model was put forward. And then the overview and comparison for current classic reputation based trust models were made. Finally, the challenges of this field for future research were presented, as well as some problems existing in current research arc discussed.

Key words: Peer-to-peer, Trust model, Reputation