A NIST CSRC biometrics page lists publications and more tagged with "biometrics".
The National Institute of Standards and Technology (NIST) has a Computer Security Resource Center (CSRC) page for items tagged with "biometrics".
The page [0] lists NIST items in the following categories: publications, news, projects, and events.
The index material falls into the category of nationally developed technical standards.
Example publications include "Digital Identity Guidelines" aka "NIST SP 800-63-4" (finalized in 2025 after 3 preceding drafts) [1] and "Biometric Specifications for Personal Identity Verification" aka "NIST SP 800-76-2" [2].
You can also find things that seem to have been started but stopped, such as "Ontology for Authentication" aka "NIST IR 8344", according to the note that "Further development of this draft has ceased (January 23, 2025)."
The NIST website is well-organized and informative. In the standards, one might find information, such as how many authentication factors are required for what kinds of secure areas, and related information.
Have fun exploring!
[0] https://csrc.nist.gov/topics/technologies/biometrics
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