With more emphasis paid on network security and privacy, the research on anonymous communication systems has developed quickly. In the past, researchers mainly focused on how to improve the anonymity, but few focused on the usability. In this paper, an anonymity-level selectalbe hierarchical anonymous communication framework (ALHACF) is presented. In this framework, firstly the anonymity level is selected by the user according to his requirement, then the path length and set of relay routers will be determined by the anonymity level. The anonymity and communication performance of ALHACF are analyzed. The analysis indicates that ALHACF inherits the merits of HLLACF, and it can prevent some kinds of attacks, keep good anonymity and increase the communication performance markedly.%随着人们对网络安全和个人隐私的日益重视,匿名通信系统的研究得到了迅速发展.但是,以往匿名通信系统的研究主要关注于如何提高匿名性,而在如何提高系统的可用性上研究较少.本文提出一种新颖的匿名通信架构(ALHACF),该架构可由用户按照自身应用需求选定一个匿名等级,然后根据该匿名等级来决定采用链路长度和中间路由节点的集合.本文对ALHACF的匿名性和通信性能进行了对比分析,结果表明:该架构继承了HLLACF的抗多种攻击性的优点,可以保持较好的匿名性,并能极大地提高通信性能.
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