Abstract: Reputation is used to help user select trustworthy peers in Peer-to-Peer(P2P) file sharing systems. But few and malicious feedback often leads to decrease of availability and reliability of reputation. So this paper proposes an objective evaluation method based on sharing duration, which makes system automatically obtain evaluation information of each user and builds trusts among peers. Simulation results show that the method effectively isolates malicious peers from good peers, resulting in increase of the reliability of trust. At the same time, differentiated services for peers with different behaviors ensure the fair of allocation of resources.

Key words: P2P file sharing, reputation system, evaluation mechanism, user feedback, sharing duration

摘要： 在P2P文件共享网络现有声誉系统中，评价信息不足和恶意评价导致声誉不可靠。为此，提出一种基于下载节点共享时长的客观评价方法。该方法使系统自动获得每个下载节点的评级信息，根据该信息建立节点之间的信任关系。仿真结果表明，共享时长方法可提高信任的可靠性，有效隔离恶意节点，并能为不同行为的节点提供分化服务，保证网络资源分配的公平性。

关键词: P2P文件共享, 声誉系统, 评价机制, 用户反馈, 共享时长

CLC Number: 

• TP309