对等系统中信任管理模型的设计

在对等系统中，由于其开放和动态的特征，通常使用模拟人际网络的信任机制来指导节点的协作决策，信任管理技术已经成为当前研究的热点．文中提出的模型分别使用可信度和不可信度对节点的正面行为和负面行为进行信任评估．在模型中，针对不熟悉的节点，通过综合在信任查询时所获得的信任反馈获知其声望．给出了一个基于节点的信任和声望的文件提供者选择方案．在使用该模型的文件共享网络仿真实验中，恶意实体被有效地隔离，网络性能也得到了提高，证明了模型的有效性。

A trust management model for peer-to-peer computer systems

Peer-to-Peer (P2P) computer systems have an open, dynamic nature for sharing content files and realtime data. Trust mechanisms modeling social networks are used to build trust in peers for choosing reliable ones for collaboration, so trust management has attracted significant research. A trust management model for P2P systems is presented, in which degrees of trust and distrust with regard to a peer are evaluated based on its positive and negative behaviors. In the model, the unfamiliar peers' reputations can be combined through feedbacks from others. A provider selection scheme based on peers' trust and reputation was designed. Model simulation shows that malicious users are isolated and the performances in downloading are improved. Simulation evaluation proves the model's effectiveness.