Advanced Encryption Standard (AES)

National Institute of Standards and Technology

doi:https://doi.org/10.6028/NIST.FIPS.197-upd1

FIPS 197

Advanced Encryption Standard (AES)

Documentation Topics

Date Published: November 26, 2001; Updated May 9, 2023

Supersedes: FIPS 197 (11/26/2001)

Planning Note (5/9/2023):

This release updates the original publication of FIPS 197 (2001), but makes no technical changes to the algorithm specified in the standard.

However, this update includes extensive editorial improvements, including the following:

The front matter is modernized (e.g., a foreword and abstract are added).
Terms and symbols are defined more comprehensively and consistently.
Formatting/typesetting is improved in a variety of ways.
Unnecessary formalism is removed.
Diagrams for the three key schedules are included. Some references were updated, and additional references are provided.

See the announcement of this update for more details about the FIPS 197 review process.

Author(s)

National Institute of Standards and Technology

Abstract

In 2000, NIST announced the selection of the Rijndael block cipher family as the winner of the Advanced Encryption Standard (AES) competition. Block ciphers are the foundation for many cryptographic services, especially those that provide assurance of the confidentiality of data.

Three members of the Rijndael family are specified in this Standard: AES-128, AES-192, and AES-256. Each of them transforms data in blocks of 128 bits, and the numerical suffix indicates the bit length of the associated cryptographic keys.

Keywords

AES; block cipher; confidentiality; cryptography; encryption; Rijndael

Control Families

None selected

Documentation

Publication:
FIPS 197 (DOI)
Local Download

Supplemental Material:
None available

Related NIST Publications:
NISTIR 8319

Document History:
12/19/22: FIPS 197 (Draft)
05/09/23: FIPS 197 (Final)

Topics

Security and Privacy
encryption