研究了基于互联网的移动计算网络的安全性问题．首先根据移动计算网络的实际应用情况提出基于网络层的安全协议设计要求，然后依据移动计算网络漫游协议的特点设计了适用于漫游主机及移动代理的双向认证协议，并对协议的性能进行了分析．分析表明，双向认证协议具有结构简单、安全性高的特点，适用于移动计算网络的应用环境 The security of Internet-based mobile computing networks is studied. First of all, based on the practical application of mobile computing network, the design requirements of the security protocol based on the network layer are proposed. Based on the characteristics of the mobile computing network roaming agreement, two-way authentication protocol for roaming host and mobile agent is designed and the performance of the protocol is analyzed . The analysis shows that the bidirectional authentication protocol has the advantages of simple structure and high security, and is suitable for the application environment of mobile computing network