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中文摘要：
P2P网络中的安全问题越来越受到关注，广泛采取的策略是建立信誉系统。提出了一种基于定向查询的分布式P2P信誉系统，节点交互历史表记录与本地节点有交互经验的各节点信息，而本地节点的信誉信息分散存储在交互历史表中各节点上的信誉信息表中。信誉查询时查询节点根据被查询节点交互历史表的信息直接定向到提供被查询节点信誉信息的节点，恶意节点表和表尾信息表保证了信誉信息的安全。仿真实验的结果表明该信誉系统可以有效地减少无效交互的次数，遏制恶意节点对信誉信息的破坏。
英文摘要：
With more and more important P2P security concerned, the strategy of reputation systems is widely used. In this paper, a directed request based reputation system is proposed. The NID（Node Interaction History） list reegrds the nodes who have interaction experience with the local node, while the reputation of the local node is distributed stored in the reputation lists of the nodes in NID list. In the process of request serching, the request node can directly get the reputation of requested node according to the record in NID list. The reputation security, is guaranteed by the malicious nodes list and the table- tail information list. Simulation results show that the reputation system can effectively reduce the invalid interactions and prevent reputation from the damage of malicious nodes.
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