Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Recommendation for Random Number Generation Using Deterministic Random Bit Generators



Elaine B. Barker


[Superseded by SP 800-90A Revision 1 (June 2015):] This Recommendation specifies mechanisms for the generation of random bits using deterministic methods. The methods provided are based on either hash functions, block cipher algorithms or number theoretic problems.
Special Publication (NIST SP) - 800-90A
Report Number


deterministic random bit generator (DRBG), DRBG, entropy, hash function, random number generator
Created January 23, 2012, Updated November 10, 2018