The Study of Covert Channels Identification Techniques
隐通道识别技术研究

We must analyse covert channels in the system(operating system or database management system)developed at or above B2 level.A secure computer system uses both discretionary and mandato-ry access controls to restrict the flow of information through legitimate communication channels.Covert channels are untrusted subjects at a higher security level who transfer information either using manipu-lation(I, e alteration)of some storage resources and the receivers at a lower security level monitor the al-terations or using modulation their running time to affect the receivers' response time.This paper shows several methods in covert channel identihcation and compares their advantages and disadvantages.