NIST Special Publication 800-177 Revision 1 Trustworthy Email Scott Rose J. Stephen Nightingale Simson Garfinkel Ramaswamy Chandramouli This publication is available free of charge from: https://doi.0rg/10.6028/NIST.SP.800-177r1 COMP UTE R S E CＵRIＴY NST National Institute of Standards and Technology U.S.Department of Commerce NIST Special Publication 800-177 Revision 1 Trustworthy Email Scott Rose J. Stephen Nightingale* Advanced Network Technology Division Information Technology Laboratory Simson L. Garfinkel US Census Bureau Ramaswamy Chandramouli Computer Security Division Information Technology Laboratory *Former employee; all work for this publication was done while at NIST This publication is available free of charge from: https://doi.0rg/10.6028/NIST.SP.800-177r1 February 2019 U.S. Department of Commerce Wilbur L. Ross, Jr., Secretary National Institute of Standards and Technology Walter Copan, NIST Director and Under Secretary ofCommerce for Standards and Technology Authority This publication has been developed by NIST in accordance with its statutory responsibilities under the FederalInformationSecurityModernizationAct(FISMA)of2014,44U.S.C.$3551etseqg.,PublicLaw (P.L.) 113-283. NIST is responsible for developing information security standards and guidelines, including 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 guideline is consistent with the requirements of the Office of Management Circular A-130, Appendix IV: Analys is of Key Sections. Supplemental information is provided in Circula A-130, Appendix III, Security of Federal Automated Information Resources. Nothing in this publication should be taken to contradict the standards and guidelines made mandatory and guidelines be interpreted as altering or superseding the existing authorities of the Secretary of Commerce Director of the OMB, or any other federal official. This publication may be used by nongovernmenta 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 Standards and Technology Special Publication 800-177 Revision 1 Natl. Inst. Stand. Technol. Spec. Publ. 800-177 Revision 1, 128 pages (February 2019) CODEN: NSPUE2 This publication is available free of charge from: https://doi.org/10.6028/NIST.SP.800-177r1 Certain commercial entities, equipment, or materials may be identified in this document in order 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 the purpose. There may be references in this publication to other publications currently under development by NIST in accordance with its assigned statutory responsibilities. The information in this publication, including concepts and methodologies, maybe used byfederal agencies evenbeforethe completion of such companionpublications.Thus,until each publication is completed, current requirements, guidelines, and procedures, where they exist, remain operative. For planningandtransitionpurposes,federal agenciesmaywishtocloselyfollowthedevelopmentofthesenew publications by NIST. Organizations are encouraged to review all draft publications during public comment periods and provide feedback to NIST.AllNIST Computer : Security Division publications, other than the ones noted above, are available at https://csrc.nist.gov/publications Comments on this publication may be submitted to: National Institute of Standards and Technology Attn: Advanced Network Technologies Division, Information Technology Laboratory 100 Bureau Drive (Mail Stop 8920) Gaithersburg, MD 20899-8920 Email: [email protected] All comments a