A branch of the United States National Security Agency that defines standards and classifications for computer and network security, ranging from "A1" (the highest level of computer security) to "D" (the lowest level of security or, essentially, no computer security whatsoever). The "C" security classification can be used in commercial envoironments, but at the "B" level, the access-control mechanisms become too unwieldy for commercial use. Security levels are defined in Department of Defense Standard 5200.28.
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