NIST SP 800-63A-4:Digital Identity Guidelines - Identity Proofing and Enrollment

Published

August 1, 2025

Author(s)

David Temoshok, Yee-Yin Choong, Ryan Galluzzo, Marie LaSalle, Andrew Regenscheid, Christine Abruzzi, James L. Fenton, Naomi Lefkovitz

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.

Citation

Special Publication (NIST SP) - 800-63A-4

Report Number

800-63A-4

NIST Pub Series

Special Publication (NIST SP)

Pub Type

NIST Pubs

Download Paper

https://doi.org/10.6028/NIST.SP.800-63A-4

Local Download

Keywords

authentication, credential service provider, digital authentication, identity proofing, federation.

Citation

Temoshok, D. , Choong, Y. , Galluzzo, R. , LaSalle, M. , Regenscheid, A. , Abruzzi, C. , Fenton, J. and Lefkovitz, N. (2025), NIST SP 800-63A-4:Digital Identity Guidelines - Identity Proofing and Enrollment, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.SP.800-63A-4 , https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=959881 (Accessed October 14, 2025)