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Tue, 26 Aug 2025 08:51:12 -0500 ABSTRACT This guideline focuses on the authentication of subjects who interact with government information systems over networks to establish that a given claimant is a subscriber who has been previously authenticated. The result of the authentication process may be used locally by the system performing the authentication or asserted elsewhere in a federated identit

Background In July 2025, NIST released the final version of SP 800-63, Revision 4. The culmination of an almost four-year process that included foundational research, two public drafts, and nearly 6,000 individual comments from the public, Revision 4 of SP 800-63, Digital Identity Guidelines, intends to respond to the changing digital landscape that has emerged since the last major revision of thi

This revision of NIST SP 800-63 has been superseded by NIST SP 800-63-4 as of August 1, 2025. Please refer to those documents for the current guidelines. The four-volume SP 800-63 Digital Identity Guidelines document suite is available in both PDF format and online. PDF versions of the documents are available from: Document Title URL