Distributed and Effective Reputation Mechanism in P2P Systems

As reputation mechanism has been widely accepted and adopted to enhance trust in P2P systems, how to cope with the attack and disturbance problems on reputation mechanism, such as collusion, malicious or unfair rating, and strategic attacks, becomes a key challenge. This paper extends the normal reputation based global trust model, which mostly mixes up the role difference between providing services and providing feedbacks, and simply substitute the quality of feedback for that of the service, to a feedback credibility (FC) based distributed global trust model (FCTrust). Theoretical analysis and simulation experiments show that, FCTrust has advantages in combating various malicious behaviors such as dishonest feedbacks, the collusion and the strategic attacks to the trust model itself, over the current global trust models, and demonstrates more robustness and effectiveness.