基于时空相关性的P2P网络信任模型*

P2P网络的匿名性、自组织性及高度动态性，使得基于P2P网络的病毒、木马大量流行，威胁网络安全,而信任机制能够有效缓解多种安全问题。针对现有信任模型的不足，提出在具有时间特性的DyTrust信任模型基础上，将空间特性纳入考虑，建立基于时空相关性的信任模型。理论分析及仿真实验结果显示：本模型具有较好的动态适应能力，能够有效防止各种恶意行为。

Time-space based trust model for P2P system

The anonymity, self-organization and dynamicity of P2P networks make P2P-based viruses and Trojan prevalent, which pose threats to Internet security. P2P trust models can effectively abate this situation and settle many security problems. This paper intended to present a more effective trust model against the defects of current trust models. And presented a new time-space based trust model which made use of DyTrust model and took space into account additionally. Theoretical analysis and simulation experiment show that the time-space based trust model is effective on modeling dynamic trust relationships and resisting attacks.