ABSTRACT
Although the words “covert channeling” bring up for some people images of spies and evil spirits, the
meaning we discuss in this chapter is even more interesting and sometimes even more sinister.
Secret communications, where there is seemingly no communication happening within the same
machine or even across the network, can be accomplished with covert channels. Specifically,
communication that violates a site security policy despite the deployed technology safeguards is of
particular interest.
