NIST SP 800-171 is a special publication from the National Institute of Standards and Technologies (NIST) that outlines requirements for protecting controlled unclassified information (CUI) in non-federal information systems and organizations. It is primarily intended for defense contractors and other organizations that process, store, or transmit CUI on behalf of the federal government. Compliance with NIST SP 800-171 is required to ensure the secure handling of sensitive defense-related data as part of contracts with the United States Department of Defense (DoD) and other federal agencies.
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