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1·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。

2·Covert channel technique is to hide the communication process itself.

隐秘信道技术是为了隐藏通信过程本身。

3·Covert channel analysis is an inevitable problem of high security computer system research.

隐通道分析是研究高安全性计算机系统不可回避的问题。

4·Detail design and code framework are given, tests are done to validate the network covert channel.

该文给出详细方案设计和代码框架，通过测试验证该隐蔽通道的有效性。

5·Information hiding techniques including steganography, Covert channel, digital watermark technology.

信息隐藏技术包括隐写术，隐信道技术，数字水印技术等。

6·In the case of operating system, many threats and attacks are covert, and covert channel is one of them.

对操作系统来说，许多威胁和攻击是隐藏的，隐蔽通道就是其中一种。

7·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。

8·For the identified covert channels, accurate bandwidth computation and appropriate covert-channel handling have been performed.

对被标识的隐蔽通道，准确地计算了它们的带宽，并进行了适当的隐蔽通道处理。

9·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。

10·Now covert channel analysis is the main bottleneck of development of security information system with high security level in our country.

目前，隐蔽通道分析是阻碍我国开发高安全等级信息系统的主要瓶颈。