60.1.1 Types of restricted areas. The degree of security and control
required for a facility depends on the nature, sensitivity, and importance of
the security interest. Restricted areas are established to provide:
An effective application of necessary security measures, such as
exclusion of unauthorized personnel.
Increased access controls over those areas requiring special
Conditions for compartmentalizing classified information, critical
material, or equipment with minimum impact on operations.
Restricted areas or portions of restricted areas, may be further
administratively designated as controlled, limited, or exclusion areas, These
designations allow varying degrees of access restriction, movement control,
and protection to be applied, as needed.
60.1.2 Exclusion area. An exclusion area is defined as a restricted area
that stores or processes classified information and material. Access or
proximity to the area constitutes, for all practical purposes, access to the
classified information and material. Access to exclusion areas should be
restricted to personnel cleared to the level of the information being stored
or processed and whose duties require access and a need-to-know.
60.1.3 Limited area. A limited area is defined as a restricted area that
stores or processes classified information and material. it is an area to
which only authorized (cleared) personnel should be permitted free access.
Uncleared personnel may enter a limited area only if escorted by authorized
personnel at all times.
60.1.4 Controlled area. A controlled area is one that usually surrounds an
exclusion or limited area. It is normally established for administrative
control, safety, or as a buffer zone to increase the security of exclusion or
limited areas. The requirements for access to a controlled area are less
restrictive than those of the limited and exclusion areas. Authorization for
access to and movement within a controlled area may include personnel with
official business or quasi-official business, such as concessionaires or
building and grounds maintenance personnel.
60.1.5 Controlled space (CS). CS, for TEMPEST purposes, is defined as the
three-dimensional space surrounding classified information processors that is
intended to contain any compromising emanations radiated by the equipment.
CS may be the physical confines of operational facilities, or if emanations
exist beyond the, facility's walls, floors, or ceilings, may include large
areas of the building that houses the facility, or the installation on which
the building is located. CS may be designated as an exclusion, limited, or
controlled area. Personnel need not be cleared to the level of compromising
emanations present to access a CS. For example, a sensitive compartmented
information facility (SCIF) is designated as an exclusion area. The
equipment contained in the SCIF may radiate outside the exclusion area into
an area designated as a controlled area (i.e., a parking lot within a fenced
area). It is not necessary to redesignate this CS as an exclusion area,
because personnel cannot detect the presence of compromising emanations. The
effectiveness of a CS is dependent upon the distance compromising emanations
will travel in an exploitable form, and the distance from that point that a
hostile agent would be forced to attempt an intercept operation. CS
eliminates or reduces accessibility, which is one of the essential elements
of TEMPEST vulnerability.