speedTrust: a super peer-guaranteed trust model in hybrid P2P networks

摘要

To curb malicious behavior, researchers have proposed a lot of trust models for P2P networks, most of which, however, suffer from the problems of high complexity, bad scalability and huge overhead due to the iterative trust calculations and the global search for feedbacks. In this paper, we propose a super peer-guaranteed trust model, speedTrust, for hybrid P2P networks. Considering the fact that the quality of services and feedbacks is the most important factor directly impacting on a trust model's availability, we establish a feedback guarantee relationship between the service requester and its super peer, as well as a service guarantee relationship between the service provider and its super peer before a transaction begins. Moreover, a peer's reputations are calculated using its pledged reputations for its involved transactions without any iterative operations. These features largely reduce the trust model's complexity while discouraging peers from behaving maliciously for fear of being punished. The simulation results show that the speedTrust model is effective and efficient in terms of the successful transaction rate, the ability in curbing malicious behavior and the complexity.