Digital Identity Guidelines: Implementation Resources

July 1, 2020

NIST Special Publication 800-63-3, Digital Identity Guidelines, is an umbrella publication that introduces the digital identity model described in the SP 800-63-3 document suite. It frames identity guidelines in three major areas:

In addition to introducing the detailed guidelines in these areas, SP 800-63-3 addresses the factors involved in choosing the appropriate Identity Assurance Level (IAL), Authentication Assurance Level (AAL), and Federation Assurance Level (FAL) for a given application.

These implementation resources are provided pursuant to OMB memorandum M-19-17. While these resources reference normative guidelines in the SP 800-63-3 document suite and other documents, these resources are intended as informative implementation guidance and are not normative. These implementation resources provide guidance for SP 800-63-3 in three parts:

Section numbers are presented in parentheses in each part which refer to the SP 800-63-3 volume corresponding to that part.

Comments on these guidelines are welcomed and can be submitted via email to

A PDF version of these implementation resources can be found online at