中文摘要：

通过距离判别算法和模板分析思想的结合,提出一种新的基于多级模板分析的空间传输协议识别算法.根据空间协议特征构建一级模板,利用一级模板间距离建立二级模板,然后基于距离判断算法进行模板分析,实现协议识别.实验结果表明：多级模板分析可提高空间协议识别效率,该方法为协议识别技术研究提供新的思路.

英文摘要：

A new space transportation protocol identification algorithm based on multilevel template analysis is proposed by combining the distance judge algorithm and template analysis idea.The first level template can be built by space protocol characteristics,the second level template can be built by the distances between the first level templates.Then,the distance judge algorithm is used to make the template analysis and realize protocol identification.Experiment results demonstrate that multilevel template analysis improves the efficiency of space protocol identification and provides new ideas for the research of protocol identification techniques.