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categorization

See security categorization.
Source: NIST SP 800-137

category (C.F.D.)

Restrictive label applied to classified or unclassified information to limit access.

central facility (or Tier 0)

See Tier 0.
Source: CNSSI No. 4032

central office of record (COR)

The entity that keeps records of accountable COMSEC material held by COMSEC accounts subject to its oversight.
Source: CNSSI No. 4005 (COMSEC)

central services node (CSN)

The Key Management Infrastructure core node that provides central security management and data management services.