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The transmission - generated by a standard internal bus - renders the computer into a small cellular transmitter antenna. [9] [10] In 2016, researchers categorized various "out-of-band covert channels" [11] (OOB-CCs), which are malware communication channels that require no specialized hardware at the transmitter or receiver. OOB-CCs are not as ...
A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance , espionage and police investigations.
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A covert channel is so called because it is hidden from the access control mechanisms of secure operating systems since it does not use the legitimate data transfer mechanisms of the computer system (typically, read and write), and therefore cannot be detected or controlled by the security mechanisms that underlie secure operating systems.
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