匿名通信技术是保护用户隐私的一种重要手段,通过隐藏通信双方的身份,以及发送者和接收者之间的通信关系,匿名通信系统能对用户的隐私进行保护。文中设计了一种适用于对等网络系统的匿名通信协议-C-EDR协议。C-EDR协议将系统用户组织成一个Crowds群,并借鉴了现有的匿名通信技术,针对特定的应用环境和设计目标对相关的匿名通信技术做出了改进。 Anonymous communication technology is an important means to protect the privacy of users. Anonymous communication systems can protect the privacy of users by hiding the identity of both communication parties and the communication relationship between sender and receiver. In this paper, an anonymous communication protocol-C-EDR protocol is designed for peer-to-peer network system. The C-EDR protocol organizes system users into a Crowds Group and draws on existing anonymous communications technologies to improve the related anonymous communications technologies for specific application environments and design goals.