Abstract: This paper presents an anonymity algorithm，which dynamically changes source address in IP layer to make a anonymity communications.In sending packet，it dynamically establishes the anonymity link，while encrypting and recording the middle address in packet.The record of middle addresses on the path is encrypts hop by hop，which looks like a onion with the source IP inside and destination IP outside.The response of the packet traces the middle address back to the original source node.The algorithm does not only ensuring the sender anonymous，but also protecting the information of the source address from lost.Analysis shows that the algorithm can provide high-level anonymous，dynamically ensconce the source address，has less bandwidth cost，has less encryption times and shorter time delay.So the algorithm can provide high quality anonymity communication in IP layer in mobile Internet.

摘要： 提出了一种匿名算法，通过在IP层动态变化源地址，实现匿名通信。该算法在发送报文时动态建立匿名链路，加密记录中间结点地址，形成一个源地址在最内层，最后一跳节点地址在最外层的洋葱地址数据。在报文应答时，按照发送时形成的洋葱地址数据逐跳回送应答报文。这样既有效保证了发送方匿名，又保证了源地址信息不丢失。分析表明，该算法动态隐藏源地址，匿名度高，带宽消耗低，加解密次数少，时延短，可以为移动互联网络提供优质的网络层匿名通信服务。