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Maintenance (NIST SP 800-53 security control family)
Any act that either prevents the failure or malfunction of equipment or restores its operating capability.
NIST SP 800-82 Rev. 2 under Maintenance
The process of managing PIV Cards or Derived PIV Credentials (and its token) once they are issued. It includes re-issuance, post issuance updates, and termination.
NIST SP 800-79-2 under Maintenance
An application that requires special attention to security due to the risk and magnitude of harm resulting from the loss, misuse, or unauthorized access to or modification of the information in the application. Note: All federal applications require some level of protection. Certain applications, because of the information in them, however, require special management oversight and should be treated as major. Adequate security for other applications should be provided by security of the systems in which they operate.
NIST SP 800-18 Rev. 1 under Major Application