Date Published: September 4, 2025
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National Institute of Standards and Technology
Announcement
NIST Special Publication (SP) 800-90Ar1 (Revision 1), Recommendation for Random Number Generation Using Deterministic Random Bit Generators (DRBGs), provides guidelines for generating cryptographically secure random numbers using deterministic methods. This recommendation specifies approved DRBG mechanisms based on hash functions and block ciphers.
NIST is planning a second revision of SP 800-90A to reflect advancements in cryptographic research and maintain consistency across related standards. This will involve:
- Improving alignment with the upcoming revision of SP 800-90C
- Introducing a new DRBG construction based on eXtendable-Output Functions (XOFs), specifically using the SHAKE algorithms defined in Federal Information Processing Standards (FIPS) publication 202
- Addressing technical comments and feedback received since the previous publication
NIST invites public comments on all aspects of the current SP 800-90A until November 4, 2025. Send comments to [email protected] with “Comments on SP 800-90A” in the subject line.
All comments received will be posted on this page after the closing date. Submitters’ names and affiliations (when provided) will be included, while contact information will be removed.
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