system high security mode

{
  "id": "MLC-T-CYB-004194",
  "term": "system high security mode",
  "field": "Cybersecurity",
  "definition": "The mode of operation in which system hardware/software is only trusted to provide need-to-know protection between users. In this mode, the entire system, to include all components electrically and/or physically connected, must operate with security measures commensurate with the highest classification and sensitivity of the information being processed and/or stored. All system users in this environment must possess clearances and authorizations for all information contained in the system. All system output must be clearly marked with the highest classification and all system caveats, until the information has been reviewed manually by an authorized individual to ensure appropriate classifications and caveats have been affixed.\n\nA system is operating in the system-high mode when each user with direct or indirect access to the system, its peripherals, remote terminals, or remote hosts has all of the following:\n\n• A valid personnel clearance for all information on the system.\n\n• Formal access approval for, and has signed nondisclosure agreements for all the information stored and/or processed (including all compartments, subcompartments, and/or special access programs).\n\n• A valid need-to-know for some of the information contained within the system.",
  "references": [
    "CNSSI 4009-2022 from NCSC-TG-004-88 (adapted)",
    "NIST CSRC Glossary"
  ],
  "url": "https://mlchart.com/terminology/cybersecurity/system-high-security-mode/"
}