Abstract: In order to increase the rate of successful exchange, encourage peers to contribute their recourses actively, and make the P2P file sharing system develop continually, a dynamic topology based reputation was proposed. The peers in the P2P network were encouraged to contribute their recourses via the incentive mechanism, so the network would be running continually. These made P2P file sharing system work normally, and the capability of network would be increased. The simulation experiments and theoretical analysis of the reputation incentive mechanism prove that the mechanism is correct and valid. Compared with the former trust models, the reputation incentive mechanism has higher security and simplicity, and reaches the expected goal.

Key words: Peer-to-Peer (P2P) network, dynamic topology, reputation, incentive mechanism, file-sharing

摘要： 为了提高对等（P2P）文件共享系统的交易成功率,鼓励节点积极贡献自身资源,增加网络资源,促进网络良性持续发展,建立一种基于动态拓扑构造的激励机制。该激励机制可对网络节点行为进行有效激励,通过拓扑优化来促进网络公平和发展,保证了P2P共享文件系统的良性运行,提高了网络的性能。通过模拟仿真实验和分析表明,提出的基于节点可信度的信誉激励机制具有正确性、有效性等特点,与现有的信任模型相比,在安全性和简约性等也有较大改进,达到了预期的设计目标。

关键词: 对等网络, 动态拓扑, 信誉, 激励机制, 文件共享