U.S. flag   An official website of the United States government
Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock (Dot gov) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

NISTIR 8427 (Draft)

Discussion on the Full Entropy Assumption of the SP 800 90 Series

Date Published: September 7, 2022
Comments Due: October 31, 2022
Email Comments to: rbg_comments@nist.gov

Author(s)

Darryl Buller (NSA), Aaron Kaufer (NSA), Allen Roginsky (NIST), Meltem Sönmez Turan (NIST)

Announcement

The NIST SP 800-90 series supports the generation of high-quality random bits for cryptographic and non-cryptographic use. The security of a random number generator depends on the unpredictability of its outputs, which can be measured in terms of entropy. The NIST SP 800-90 series uses min-entropy to measure entropy. A full-entropy bitstring has an amount of entropy equal to its length. Full-entropy bitstrings are important for cryptographic applications, as these bitstrings have ideal randomness properties and may be used for any cryptographic purpose. Due to the difficulty of generating and testing full-entropy bitstrings, the SP 800-90 series assumes that a bitstring has full entropy if the amount of entropy per bit is at least 1 - ε, where ε is at most 2-32. NIST IR 8427 provides a justification for the selection of ε.

Abstract

Keywords

entropy; min-entropy; random number generation
Control Families

None selected

Documentation

Publication:
NISTIR 8427 (Draft) (DOI)
Local Download

Supplemental Material:
None available

Related NIST Publications:
SP 800-90C (Draft)

Document History:
09/07/22: NISTIR 8427 (Draft)

Topics

Security and Privacy
random number generation