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Covert channel
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==Identifying covert channels== Ordinary things, such as existence of a file or time used for a computation, have been the medium through which a covert channel communicates. Covert channels are not easy to find because these media are so numerous and frequently used. Two relatively old techniques remain the standards for locating potential covert channels. One works by analyzing the resources of a system and other works at the source-code level.
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