多进制网络时间隐蔽信道设计及仿真实现

Design and Simulation of Multi-state Network Covert Timing Channel

基于二进制编码的网络时间隐蔽信道,信道容量有限,可传输信息量较少,受网络状态的影响较大。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。通过信道容量分析,得出多进制通道的可行性,并设计三种通道实现方式;针对单路径下延迟抖动特点,分析各种通道区分不同编码的计算单位,保证通道的有效性。仿真实例结果表明,提出的三种多进制网络时间隐蔽信道具有较高的信道容量,各有特点和实用价值。

Binary-Encoding network covert timing channel, which greatly influenced by the network status, haslimited channel capacity and less transmitted information. For improving the capacity of covert channel in complex network situation, multi-state network covert timing channel was proposed. Through analysis of the channel capacity, the feasibility of multi-state channel was proved and three types of multi-state channel were designed ; according to single path network, the calculation units to distinguish between different encodings of various channels was analyzed to ensure the effectiveness of channel. The results of simulation show that the proposed multi-state network covert timing channels with higher channel capacity and all have their own characteristics and the practical value.