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adequate security

Definitions:

  Security commensurate with the risk and the magnitude of harm resulting from the loss, misuse, or unauthorized access to or modification of information.
Sources:
FIPS 200 under ADEQUATE SECURITY
CNSSI 4009-2015
NIST SP 800-128 under Adequate Security
NIST SP 800-18 Rev. 1 under Adequate Security

  Security commensurate with the risk and magnitude of harm resulting from the loss, misuse, or unauthorized access to or modification of information.
Sources:
NIST SP 800-30 Rev. 1 under Adequate Security
NIST SP 800-39 under Adequate Security

  security commensurate with the risk and magnitude of the harmresulting from the loss, misuse, or unauthorized access to or modification of information. This includes assuring that systems and applications operate effectively and provide appropriate confidentiality, integrity, and availability, through the use of cost-effective management, acquisition, development, installation, operational, and technical controls.
Sources:
NIST SP 800-16 under Adequate Security

  Security protections commensurate with the risk resulting from the unauthorized access, use, disclosure, disruption, modification, or destruction of information. This includes ensuring that information hosted on behalf of an agency and information systems and applications used by the agency operate effectively and provide appropriate confidentiality, integrity, and availability protections through the application of cost-effective security controls.
Sources:
NIST SP 800-128
NIST SP 800-37 Rev. 2 from OMB Circular A-130 (2016)
NIST SP 800-53 Rev. 5 from OMB Circular A-130 (2016)
NIST SP 800-53A Rev. 5 from OMB Circular A-130 (2016)

  Security commensurate with the risk and the magnitude of harm resulting from the loss, misuse, or unauthorized access to or modification of information. This includes assuring that systems and applications used by the agency operate effectively and provide appropriate confidentiality, integrity, and availability, through the use of cost-effective management, personnel, operational, and technical controls.
Sources:
NIST SP 800-137 under Adequate Security

  Meets minimum tolerable levels of security as determined by analysis, experience, or a combination of both and is as secure as reasonably practicable (i.e., incremental improvement in security would require an intolerable or disproportionate deterioration of meeting other system objectives, such as those for system performance, or would violate system constraints).
Sources:
NIST SP 800-160v1r1 under adequate security (systems)