File pollution has become a very serious problem in peer-to-peer file sharing systems,because which greatly reduces the effectiveness of systems. There are two representatives reputation based anti-pollution mechanisms,peer reputation systems and object reputation systems respectively. This paper proposes an anti-pollution mechanism combined with peer reputation and object reputation, in which the reputation of sharing files are weighted by the reputation of voting peers. Severe penalty strategy and voting incentive mechanism are introduced in calculating peer reputation, which not only isolat...
