NIST SP 800-90B, titled "Recommendation for a Randomness Mining Approach to Unpredictability and Random Bit Generation," is a publication from the National Institute of Standards and Technology (NIST) that provides guidelines on assessing the quality of random number generators (RNGs) and the sources of entropy that they use. It is part of a series of documents that focus on cryptographic standards and guidelines.
New to topics? Read the docs here!