The Committee on National Security Systems (CNSS) Instruction No. 1253, Security Categorization and Control Selection for National Security Systems, provides all Federal Government departments, agencies, bureaus, and offices with guidance on the first two steps of the Risk Management Framework (RMF), Categorize and Select, for national security systems (NSS). This Instruction builds on and is a companion document to National Institute of Standards and Technology (NIST) Special Publication (SP), 800-53, Security and Privacy Controls for Federal Information Systems and Organizations.
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