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 800-63A-4 Digital Identity Guidelines: Identity Proofing and Enrollment Share to Facebook Share to X Share to LinkedIn Share ia Email Documentation Topics Date Published: July 2025 Supersedes: SP 800-63A (03/02/2020) Author(s) David Temoshok (NIST) , Christine Abruzzi (Cacapon Cyber Solutions) , Yee-Yin Choong (NIST) , James Fenton (Altmode Networks) , Ryan Galluzzo (NIST) , Connie LaSalle (NIST) , Naomi Lefkovitz (NIST) , Andrew Regenscheid (NIST) , Maria Vachino (Calvert Consulting) Abstract This guideline focuses on identity proofing and enrollment for use in digital authentication. During the process of identity proofing, an applicant provides evidence to a credential service provider (CSP) reliably identifying themselves, thereby allowing the CSP to assert that identification at a useful identity assurance level. This document defines technical requirements for each of three identity 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) 800-63A. This guideline focuses on identity proofing and enrollment for use in digital authentication. During the process of identity proofing, an applicant provides evidence to a credential service provider (CSP) reliably identifying themselves, thereby allowing the CSP to assert that identification at a... See full abstract This guideline focuses on identity proofing and enrollment for use in digital authentication. During the process of identity proofing, an applicant provides evidence to a credential service provider (CSP) reliably identifying themselves, thereby allowing the CSP to assert that identification at a useful identity assurance level. This document defines technical requirements for each of three identity 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) 800-63A. Hide full abstract Keywords authentication ; credential service provider ; digital authentication ; identity proofing ; federation Control Families None selected Documentation Publication: https://doi.org/10.6028/NIST.SP.800-63a-4 Download URL Supplemental Material: Project homepage Publication Parts: SP 800-63-4 SP 800-63B-4 SP 800-63C-4 Document History: 12/16/22: SP 800-63A-4 (Draft) 08/21/24: SP 800-63A-4 (Draft) 07/31/25: SP 800-63A-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