一种基于组群的P2P网络信任模型*

由于P2P网络的开放、匿名等特点，使得P2P网络对节点缺乏约束机制，节点间缺乏信任。提出了一种应用于非结构化P2P网络的信任模型——BGTrust。该模型对组群内信任采用局部推荐信任和组群间信任采取全局信任的方法进行处理，充分结合了全局信任和局部信任的优点。仿真表明，该信任模型在对交互的信任度评价可信度和抑制恶意节点方面较已有模型有一定改进。

Group trust model in P2P network

Trust is a problem of particular importance in peer-to-peer network. However, the feature of peer-to-peer network such as user anonymity, open nature makes that peers are not responsible for their irresponsible bartering history. This paper proposed a trust model named BGTrust, BGTrust in unstructured P2P network was proposed, it discriminates the trust relationship s between entities in the same autonomous group and in different group and handles the two different trust relationships with different approaches, combination of the global trust and local trust advantages ,so simple computation, low network load. Mathematic analyses and simulations results show that the proposed algorithm outperform the the current trustmodels in reliability on interacting trust degree evaluation and the inhibition to the malicious peers.