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  Designation applied to information systems, and to associated areas, circuits, components, and equipment, in which national security information is encrypted or is not processed.
CNSSI 4009-2015 from CNSSAM TEMPEST/01-13 - Adapted, NSTISSI No. 7002

  Designation applied to encrypted information and the information systems, the associated areas, circuits, components, and equipment processing that information.
CNSSI 4009-2015 from CNSSI 4005