Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
This page is no longer being updated and the information may be out of date.
Strength of identity proofing
This page is ARCHIVED. Please visit https://www.nist.gov/identity-access-management for current information on NIST’s Identity and Access Management work.
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Created May 2, 2016, Updated May 27, 2026