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

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

Updates 2000

Announcing a Workshop on Modes of Operation for Symmetric Key Block Cipher Algorithms
July 25, 2000

The National Institute of Standards and Technology (NIST) announces a workshop to discuss modes of operation for the protection of data using a symmetric key block cipher algorithm. The results of this workshop will be used by NIST in development a draft modes of operation standard for symmetric key block cipher algorithms. Comments and papers are encouraged prior to the workshop to propose, define, and justify any modes that are appropriate for NIST to include in such a standard. These comments and papers should be addressed to EncryptionModes@nist.gov.

Federal Register Notice

Document Number: 00-18811
Created December 18, 2016, Updated June 22, 2020