NIST Special Publication 800 -171 Revision 2 Protecting Controlled Unclassified Information in Nonfederal Systems and Organizations RON ROSS VICTORIA PILLITTERI KELLEY DEMPSEY MARK RIDDLE GARY GUISSANIE This publication is available free of charge from: https://doi.org/10.6028/NIST.SP.800 -171r2 NIST Special Publication 800 -171 Revision 2 Protecting Controlled Unclassified Information in Nonfederal Systems and Organizations RON ROSS VICTORIA PILLITTERI KELLEY DEMPSEY Computer Security Division National Institute of Standards and Technology MARK RIDDLE Information Security Oversight Office National Archives and Records Administration GARY GUISSANIE Institute for Defense Analyses This publication is available free of charge from: https://doi.org/10.6028/NIST.SP.800 -171r2 February 2020 INCLUDES UPDATES AS OF 01- 28-2021; SEE PAGE X U.S. Department of Commerce Wilbur L. Ross, Jr., Secretary National Institute of Standards and Technology Walter Copan, NIST Director and Under Secretary of Commerce for Standards and Technology SP 800- 171, REVISION 2 PROTECTING CONTROLLED UNCLASSIFIED INFORMATION _________________________________________________________________________________________________ PAGE i This publication is available free of charge from: https://doi.org/10.6028/NIST.SP.800 -171r2 Authority This publication has been developed by NIST to further its statutory responsibilities under the Federal Information Security Modernization Act (FISMA), 44 U.S.C. § 3551 et seq. , Public Law (P.L.) 113 -283. NIST is responsible for developing information security standards and guidelines, including minimum requirements for federal information systems. Such information security standards and guidelines shall not apply to national security systems without the express approval of the ap propriate federal officials exercising policy authority over such systems. This guideline is consistent with the requirements of the Office of Management and Budget (OMB) Circular A-130. Nothing in this publication should be taken to contradict the standar ds and guidelines made mandatory and binding on federal agencies by the Secretary of Commerce under statutory authority. Nor should these guidelines be interpreted as altering or superseding the existing authorities of the Secretary of Commerce, OMB Direct or, or any other federal official. This publication may be used by nongovernmental organizations on a voluntary basis, and is not subject to copyright in the United States. Attribution would, however, be appreciated by NIST. National Institute of Standar ds and Technology Special Publication 800 -171, Revision 2 Natl. Inst. Stand. Technol. Spec. Publ. 800 -171, Revision 2 , 113 pages (February 2020) CODEN: NSPUE2 This publication is available free of charge from: https://doi.org/10.6028/NIST.SP.800- 171r2 Comments on this publication may be submitted to: National Institute of Standards and Technology Attn: Computer Security Division, Information Technology Laboratory 100 Bureau Drive (Mail Stop 8930) Gaithersburg, MD 20899 -8930 Email: [email protected] All comments are subject to release under the Freedom of Informat ion Act (FOIA) [FOIA96 ] Certain commercial entities, equipment, or materials may be identified in this document to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by NIST, nor is it intended to imply that the entities, materials, or equipment are necessarily the best available for