Running SP 800-53 through the NIST Risk Management Framework: security categorization, the Prepare step, roles, authorization to operate, ongoing authorization, and common control inheritance.
How to categorize a system before selecting SP 800-53 controls: the FIPS 199 low, moderate and high impact definitions, categorizing information types, the high water mark, the RMF categorization tasks and the separate rules for national security systems.
How an ATO is granted under the RMF: who the authorizing official is and why the risk decision cannot be delegated, what goes into the authorization package, the terms, conditions and termination date, and how FedRAMP Rev5 agency certifications depend on an ATO.
When a system can drop its fixed ATO expiry and move to ongoing authorization: what SP 800-37 requires of the continuous monitoring program, the authorization frequency, how the AO keeps accepting risk, and how FedRAMP's quarterly reports support agency decisions.
How systems inherit SP 800-53 controls from a common control provider or cloud platform: system-specific, hybrid and common designations, what the provider must document and share, the cost case for common controls, and inheriting from FedRAMP-authorized services.
Who does what in an SP 800-53 program under SP 800-37: authorizing official and designated representative, CIO, common control provider, control assessor and system owner, which roles are inherently governmental, and how to avoid conflicts of interest.
What the RMF Prepare step asks for before any SP 800-53 control is chosen: the seven organization-level and eleven system-level tasks, the authorization boundary, system registration, tailored baselines or CSF Profiles and the continuous monitoring strategy.
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