中文摘要：

为了解决匿名系统中匿名性和代价的权衡问题，提出了基于DC-Nets的分级匿名通信系统模型，然后描述了系统中主要协议及实现，最后对系统的效率和安全性进行了分析．相关的分析结果表明，采用该系统进行匿名通信，不仅能获得分级匿名，使用户在匿名性能和代价之间权衡，而且具有较好的可扩展性和较高的通信效率．

英文摘要：

This paper proposed scalar anonymous system model, which partitions an anonymous system based on DC-Nets into groups of different size and provides anonymity degrees at different cost. The protocol, which is used for intra-group and intergroup communication, was described and analyzed in detail The analysis results, including theoretical analysis and simulation experiments, show that this system offers good scalability, strong security, better efficiency, and provides tradeoff between anonymity and cost for users.