摘要： 隐通道是信息流安全性研究的关键问题，国内外学者通过分析隐通道对信息安全问题进行了研究。通过分析隐通道产生条件，对两种重要的隐通道的分析方法进行了比较，提出了较为科学的改进思路。

关键词: 信息流, 隐通道, 安全

Abstract: Covert channel is the key problem of the research of information flow security, so domestic and overseas scholars research the problem of information security through analyzing covert channel. Through analyzing the generating condition of covert channel, this paper compares two important analysis methods of covert channel, provides better improving approach.

Key words: Information flow, Covert channel, Security