To solve free rider and homogenization problems in peer-to-peer (P2P) network, an incentive mechanism based on public key infrastructure (PKI) and constructed P2P network was proposed.

• 针对P2P网络的搭便车行为及网络资源的同质化现象,提出了一个基于PKI体系和结构化P2P网络的激励机制。