NIST SP 800-63 Digital Identity Guidelines

Call for Comments on Initial Public Draft of Revision 4

NIST requests comments on the draft fourth revision to the four-volume suite of Special Publication 800-63, Digital Identity Guidelines. This publication presents the process and technical requirements for meeting the digital identity management assurance levels specified in each volume. They also provide considerations for enhancing privacy, equity, and usability of digital identity solutions and technology.

NIST requests that all comments be submitted by 11:59pm Eastern Time on March 24, 2023. Please submit your comments to See the Note to Reviewers section below for specific topics about which NIST is seeking your feedback. NIST will review all comments and make them available at the NIST Identity and Access Management website. Commenters are encouraged to use the comment template provided on the NIST Computer Security Resource Center website.

Available Online

The online versions of the four volumes of draft SP 800-63-4 are available at:

PDF versions of these documents are available on the NIST Computer Security Resource Center.


The rapid proliferation of online services over the past few years has heightened the need for reliable, equitable, secure, and privacy-protective digital identity solutions.

Revision 4 of NIST Special Publication 800-63, Digital Identity Guidelines, intends to respond to the changing digital landscape that has emerged since the last major revision of this suite was published in 2017 — including the real-world implications of online risks. The guidelines present the process and technical requirements for meeting digital identity management assurance levels for identity proofing, authentication, and federation, including requirements for security and privacy as well as considerations for fostering equity and the usability of digital identity solutions and technology.

Taking into account feedback provided in response to our June 2020 Pre-Draft Call for Comments, as well as research conducted into real-world implementations of the guidelines, market innovation, and the current threat environment, this draft seeks to:

  1. Advance Equity: This draft seeks to expand upon the risk management content of previous revisions and specifically mandates that agencies account for impacts to individuals and communities in addition to impacts to the organization. It also elevates risks to mission delivery – including challenges to providing services to all people who are eligible for and entitled to them – within the risk management process and when implementing digital identity systems. Additionally, the guidance now mandates continuous evaluation of potential impacts across demographics, provides biometric performance requirements, and additional parameters for the responsible use of biometric-based technologies, such as those that utilize face recognition.
  2. Emphasize Optionality and Choice for Consumers: In the interest of promoting and investigating additional scalable, equitable, and convenient identify verification options, including those that do and do not leverage face recognition technologies, this draft expands the list of acceptable identity proofing alternatives to provide new mechanisms to securely deliver services to individuals with differing means, motivations, and backgrounds. The revision also emphasizes the need for digital identity services to support multiple authenticator options to address diverse consumer needs and secure account recovery.
  3. Deter Fraud and Advanced Threats: This draft enhances fraud prevention measures from the third revision by updating risk and threat models to account for new attacks, providing new options for phishing resistant authentication, and introducing requirements to prevent automated attacks against enrollment processes. It also opens the door to new technology such as mobile driver’s licenses and verifiable credentials.
  4. Address Implementation Lessons Learned: This draft addresses areas where implementation experience has indicated that additional clarity or detail was required to effectively operationalize the guidelines. This includes re-working the federation assurance levels, providing greater detail on Trusted Referees, clarifying guidelines on identity attribute validation sources, and improving address confirmation requirements.

Note to Reviewers

We need your help! These are DRAFT documents and, as such, will continue to evolve based on your feedback.

NIST is specifically interested in comments on and recommendations for the following topics:

Identity Proofing and Enrollment

Risk Management

Authentication and Lifecycle Management

Federation and Assertions


NOTE: All comments and responses are subject to release under the Freedom of Information Act (FOIA). A call for patent claims is included on page ii of each draft. For additional information, see the Information Technology Laboratory (ITL) Patent Policy — Inclusion of Patents in ITL Publications.