You are viewing this page in an unauthorized frame window. This is a potential security issue, you are being redirected to https://csrc.nist.gov . An official website of the United States government Here’s how you know Here’s how you know Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock ( Lock Locked padlock icon ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Search Search CSRC MENU Search Search Projects Publications Expand or Collapse Drafts for Public Comment All Public Drafts Final Pubs FIPS (standards) Special Publications (SP s ) IR (interagency/internal reports) CSWP (cybersecurity white papers) ITL Bulletins Project Descriptions Journal Articles Conference Papers Books Topics Expand or Collapse Security & Privacy Applications Technologies Sectors Laws & Regulations Activities & Products News & Updates Events Glossary About CSRC Expand or Collapse Computer Security Division Cryptographic Technology Software Security Group Hardware Security Group Security Engineering and Risk Management Applied Cybersecurity Division Cybersecurity and Privacy Applications National Cybersecurity Center of Excellence (NCCoE) National Initiative for Cybersecurity Education (NICE) Contact Us Information Technology Laboratory Computer Security Resource Center Publications NIST SP 800-63B-4 Digital Identity Guidelines: Authentication and Authenticator Management Share to Facebook Share to X Share to LinkedIn Share ia Email Documentation Topics Date Published: July 2025 Supersedes: SP 800-63B (03/02/2020) Author(s) David Temoshok (NIST) , James Fenton (Altmode Networks) , Yee-Yin Choong (NIST) , Naomi Lefkovitz (NIST) , Andrew Regenscheid (NIST) , Ryan Galluzzo (NIST) , Justin Richer (Bespoke Engineering) Abstract This guideline focuses on the authentication of subjects who interact with government information systems over networks to establish that a given claimant is a subscriber who has been previously authenticated. The result of the authentication process may be used locally by the system performing the authentication or asserted elsewhere in a federated identity system. This document defines technical requirements for each of the three authenticator assurance levels. The guidelines are not intended to constrain the development or use of standards outside of this purpose. This publication supersedes NIST Special Publication (SP) 800-63B. This guideline focuses on the authentication of subjects who interact with government information systems over networks to establish that a given claimant is a subscriber who has been previously authenticated. The result of the authentication process may be used locally by the system performing the... See full abstract This guideline focuses on the authentication of subjects who interact with government information systems over networks to establish that a given claimant is a subscriber who has been previously authenticated. The result of the authentication process may be used locally by the system performing the authentication or asserted elsewhere in a federated identity system. This document defines technical requirements for each of the three authenticator assurance levels. The guidelines are not intended to constrain the development or use of standards outside of this purpose. This publication supersedes NIST Special Publication (SP) 800-63B. Hide full abstract Keywords authentication ; authentication assurance ; credential service provider ; digital authentication ; passwords Control Families None selected Documentation Publication: https://doi.org/10.6028/NIST.SP.800-63b-4 Download URL Supplemental Material: Project homepage Publication Parts: SP 800-63-4 SP 800-63A-4 SP 800-63C-4 Document History: 12/16/22: SP 800-63B-4 (Draft) 08/21/24: SP 800-63B-4 (Draft) 07/31/25: SP 800-63B-4 (Final) Topics Security and Privacy identity & access management HEADQUARTERS 100 Bureau Drive Gaithersburg, MD 20899 X (link is external) facebook (link is external) linkedin (link is external) instagram (link is external) youtube (link is external) rss govdelivery (link is external) Want updates about CSRC and our publications? Subscribe Contact Us | Our Other Offices Send inquiries to [email protected] Site Privacy Accessibility Privacy Program Copyrights Vulnerability Disclosure No Fear Act Policy FOIA Environmental Policy Scientific Integrity Information Quality Standards Commerce.gov Science.gov USA.gov Vote.gov