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This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
back doorA secret way to take control of a computer. Also called "trap doors," back doors are built into software by the original programmer, who can gain access to the computer by entering a code locally or remotely. For example, a back door in an application would enable a person to activate either normal or hidden functions within the software. A back door in an operating system would provide access to all system functions in the computer. See encryption backdoor, Easter Egg and Back Orifice.
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