NIST Special Publication 800 -171A Assessing Security Requirements for Controlled Unclassified Information RON ROSS KELLEY DEMPSEY VICTORIA PILLITTERI NIST Special Publication 800 -171A Assessing Security Requirements for Controlled Unclassified Information RON ROSS KELLEY DEMPSEY VICTORIA PILLITTERI Computer Security Division National Institute of Standards and Technology June 2018 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 f or Standards and Technology NIST SP 800 -171A ASSESSING SECURITY REQUIREMENTS FOR CONTROLLED UNCLASSIFIED INFORMAT ION ________________________________________________________________________________________________ PAGE i This publication is available free of charge from: http s://doi.org/10.6028/ NIST.SP.800 -171A Authority This publication has been developed by the National Institute of Standards and Technology to further its statutory responsibilities under the Federal Information Security Modernization Act (FISMA) of 2014, 44 U.S.C. § 3551 et seq. , Public Law (P.L.) 113- 283. NIST is responsible for developing information security standards and guidelines, includi ng minimum requirements for federal information systems, but such standards and guidelines shall not apply to national security systems without the express approval of appropriate federal officials exercising policy authority over such systems. This g uidel ine is consistent with requirements of the Office of Management and Budget (OMB) Circular A -130. Nothing in this publication should be taken to contradict the standards and guidelines made mandatory and binding on federal agencies by the Secretary of Comme rce under statutory authority. Nor should these guidelines be interpreted as altering or superseding the existing authorities of the Secretary of Commerce, Director of OMB, or any other federal official. This publication may be used by nongovernmental orga nizations on a voluntary basis and is not subject to copyright in the United States. Attribution would, however, be appreciated by NIST. National Institute of Standards and Technology Special Publication 800- 171A Natl. Inst. Stand. Technol. Spec. Publ. 800- 171A , 92 pages (June 2018) CODEN: NSPUE2 This publication is available free of charge from: https://doi.org/10.6028/NIST.SP.800 -171A 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 Information Act (FOIA). 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 i mply that the entities, materials, or equipment are necessarily the best available for the purpose. There may be references in this publication to other publications currently under development by NIST in accordance with its assigned statutory responsibil ities. The information in this publication, including concepts, practices, and methodologies, may be used by federal agencies even before the completion of such companion publications. Thus, until each publication is completed, curren