Peer-to-peer reputation systems

A peer-to-peer (P2P) reputation system is a mechanism to rate a participant of a P2P sharing community. Trust rela-tionships can be created between participants based on their global ratings, which are created by aggregating personal-ized ratings. Reputation systems have to be able to operate even when most of the users are malicious. Out of many existing reputation systems, this paper describes Eigentrust, Fuzzy reputation, H-Trust and R2P. Among those four, the last one is a complete P2P system rather than a standalone reputation system, like the others. Brief description of each of those protocols is given. Also test results for each al-gorithm are presented, if possible. Finally, the paper dis-cusses the feasibility of aforementioned systems by compar-ing them to protocols, like Bittorrent, that do not posses any reputation mechanisms at all