Incentive compatible reputation evaluation and service assignment in P2P networks
P2P网络激励兼容的声誉评价及服务分配

P2P networks are usually made of selfish nodes where the incentive mechanisms based on reputation are often used to induce cooperation. A class of schemes based on reputation has been proposed, but almost all of them ignore the incentive compatibility of punishment when the schemes are implemented in distributed model. It is usually called second-ordered free riding in the researches of sociology or ecology: refusing service request from nodes with low reputation will increase the punisher's own reputation, so refusing isn't always a favorable choice for selfish node. The paper discussed this problem in P2P file sharing networks and proposed a continuous second-ordered reputation evaluation model and two service assignment rules: probabilistic assignment rule and proportional assignment rule. The experiments show that only the first one is incentive compatible.