Reference Documents

Director of Central Intelligence Directive 6/3 “Protecting Sensitive Compartmented Information within Information Systems” (DCID 6/3) Protection Level 4 (PL4) requirements

National Security Systems (NSS) Instruction 1253v4 “Security Controls Catalog for National Security Systems” High Impact requirements

Department of Defense (DoD) Instruction 8500.2 “Information Assurance (IA) Implementation” MAC I Classified requirements

National Institute of Standards and Technology (NIST) Special Publication (SP) 800-53 “Recommended Security Controls for Federal Information Systems” High Impact requirements

Security Control Catalog for National Security Systems (CNSS-SCC) "Extending National Institute of Standards and Technology Special Publication 800-53 to National Security Information and National Security Systems" High Impact requirements

Defense Information System Agency (DISA) Information Assurance Support Environment (IASE) Secuirty Technical Implementation Guides (STIG) Unix V5R1