【摘要】 隐蔽通道的存在给信息系统的保密性造成了严重威胁,其信息传递机理研究是实施隐蔽通道检测与控制的前提和基础.本文首先将安全系统解释成带有信号调制能力的通信信道,将信息传递过程类比成常规通信过程,研究了相应的通信要素(编码器、调制器、载波介质及解码器等)及其所对应的实体;基于这些通信要素和对应实体,提出了隐蔽通道的信息传递模型;在该模型和系统形式化描述的基础上,研究机密信息泄露的过程,并讨论了隐蔽通道的信道带宽计算方法.更多还原

【Abstract】 Covert channels cause serious security threat to information systems,and the research on the information transmission principle of the channels is crucial to detect and eliminate them.Covert channel is essentially a communication channel to transmit information illegally.In the paper,an information system is firstly regarded as a communication channel,and the information transmission in it is considered as a regular communication process.Then,an information transmission model is introduced,and it can present clearly the information transmission principle and the communication process including encoding,concocting and decoding.Lastly,a method of calculating the communication bandwidth is discussed.更多还原