Network covert channel has been widely used for network attack.
网络隐蔽通道技术是一种被广泛应用的网络攻击技术。
For improving the capacity of covert channel in complex network situation, multi-state network covert timing channel was proposed.
为在较复杂网络状况下，有效提高隐蔽信道的容量，提出了多进制网络时间隐蔽信道的设计。
Illegal communications by covert channel in network become an important way to threaten the network security.
网络数据流中利用隐蔽通道来进行非法通信已逐渐成为威胁网络信息安全的一种重要手段。
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