匿名路由算法是匿名通信系统设计的核心,选择多少节点以及哪些节点构建匿名通信路径是决定整个系统的性能和安全性的关键因素。为了提高匿名通信系统的性能,建立了以用户可用带宽为量化指标的匿名通信系统性能模型,并针对低负载和高负载匿名系统,分别给出了性能评估的方法。在该模型和方法的基础上,针对低延迟匿名通信系统T or进行了性能分析和仿真,其结果证明了所提理论模型的正确性,同时揭示了现有的基于节点静态属性的带宽加权算法在系统负载较高时的局限性。
As one of the most important concerns,when designing anonymous communication systems,anonymous routing algorithm determines the performance and security of the whole system.And it is responsible for the selection of how many nodes and which nodes to be used to construct anonymous communication paths.To improve the performance of anonymous communication systems,a new model adopting user available bandwidth as performance metric is established,and the evaluation methods are also proposed for both low-load and high-load anonymous systems.Analysis results on Tor,which is the most worldwide popular low latency anonymous communication system,verify the theoretical model,and reveal the limitations of existing static-properties based bandwidth weighted algorithm when used in high-load system.