Abstract
Based on the security OS (SLinux) designing and implementing, this paper adopted information flow sequence to represent information flows and covert channels. Categorized the covert channels according to their information flow characteristics and discussed the integral method of dealing with covert channel. On this basis, proposed a genera l framework for covert channel identification founded on information flow analysis, and designed the optimization rules of covert channel identification. The framework and the rules can decrease the illegal flow of misinformation by restricting in formation flow combination spread, and provide the basis process for improving of analyzing covert channel.
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