This paper discusses the network covert timing channel. This channel modulates network packet's time properties to transfer information secretly. Much work has been done in inventing and utilizing network covert timing channels, however, there is not so much work in other areas such as detecting and handling covert channels. Covert channel detection is difficult, what's more, it often needs human analysis to confirm whether a suspect is a real covert channel. However, we figured out that we can try to control covert channels without knowing whether there are covert channels in using, which means our approach does not rely on the detection of covert channels at all. A network traffic controller is proposed to undermine the network covert timing channel communication mechanism. We will show how our method works and why our traffic control strategy is especially efficient to handle network covert timing channels.
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