Covert computer and network communications
Robert C. Newman · 2007
The ex-filtration of confidential information across communication networks is a challenging problem. It is possible for transmissions to be hidden or masked in such a way to circumvent the security policies of an organization. An objective might be to make contacts "invisible" to all parties except designates. This can take the form of a covert channel [3]. A covert channel is described as: "any communication channel that can be exploited by a process to transfer information in a manner that violates the systems security policy."