一种网络协同隐蔽时间信道模型

Model of synergetic network covert timing channel

为解决传统网络隐蔽时间信道传输效率低、不可靠等问题,提出一种由多个计算节点协作完成网络信息隐藏的协同隐蔽时间信道(SCTC)模型。在该模型中,采用简单、可靠的同步机制,协调多个网络节点可靠地协同发送隐蔽信息。通过理论分析可知这种信道的效率比传统隐蔽信息的效率高。设计了可靠的、抗干扰的同步协议,确保了隐蔽信道的可靠性。采用了透明的隐蔽信息嵌入法,方便用户使用。为了进一步了解该信道的性能,对SCTC的传输效率、鲁棒性进行了仿真实验。实验结果表明,SCTC的传输效率是传统隐蔽时间信道的2.6倍,其抗检测性和鲁棒性更优。

In order to solve the problem that the traditional network synergetic covert timing channel is unstable and unefficient,the model of synergetic covert timing channel(SCTC) is proposed to send the covert information by several computers collaborated with each other.A reliable communication protocol synchronizing the transmitter and the receiver is designed to ensure the stability of SCTC.To improve the convenience of the covert channel,the covert information is embedded in a transparent way,and the coding scheme of '2-bits to one inter packets delay'is adopted.The results of covert communicate experiments show that,the transmission efficiency of SCTC is about 2.6 times of that of the traditional timing channel,and it has better robustness and the undetectability.