中文摘要：

基于组群的匿名实现了通过多主机的转发对发送者或双方通信关系的隐藏，典型的实现如Crowds利用转发概率实现了发送者一定程度的匿名，但该系统对于接收者匿名缺乏保护。接收者对于Crowds的组员而言完全是公开的。新模型在传统的Crowds基础上，利用公开密钥加密实现了接收者匿名，同时提出了一种新的通信加密方案，并通过改进对Jondo的管理，提高了性能，改善了匿名度。

英文摘要：

Based on crowds anonymity realizes the hiding of sender or of both sides communication relationship in the method of transmitting through multi-host. One of the typical realizations is that crowds realize the sender anonymity by the utilization of transmitting probability. However, this system is unable to protect the receiver anonymity. The recipient is totally open as to group members of Crowds. The new model is on the basis of traditional Crowds, utilize the public key encryption to protect the receiver anonymity. Meanwhile, a new kind of communication encryption scheme is put forward as well as developing the conrol over ＂Jondo＂ to improve performance and degree of anonymity.