In order to overcome the free-riding and the malicious cheat actions over the P2P file sharing system, this paper constructed and described a fair P2P networks using the auditing approach. This fairness policy used the economic model and designed some kind of trusted authority to give a user "permission" to store files,combined a traditional quota enforcement ap proach and achieved the fairness. All nodes could publish their resource usage records directly, where other nodes were audi ting those records as a part of the normal functioning of the system, and thus the nodes had natural incentives to publish their records accurately. Also discussed the working mechanism and cost analysis of this audit model in detail subsequently. The simulation results show that the auditing system has short communication delay and good scalability,and obtains good performance compared with the non-audit model.%利用审计方式构建了一个公平的对等文件共享系统.该共享模式参考了市场经济的交易模型,结合了文件共享中的限额管理技术,通过描述节点的信任度信息让其能够存储更多的文件,使节点能够发布它的资源使用记录,其他的节点就可以通过某个功能来审计这些记录的情况,以保证交易的正确性和可追溯性,实现资源上传下载的公平性.描述了审计模型的工作机制和代价分析,构建了审计模型的测试环境,性能分析表明,在大量的节点和文件进行上传和下载的时候,系统具有比较小的通信延迟和良好的扩展性,优于同类的非审计模式.
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