Block Cipher Techniques
News and Updates
Decision to Revise SP 800-38B and 38C
April 10, 2025
After two public comment periods, NIST has decided to revise CMAC and CCM block cipher modes of operation specified in NIST Special Publications 800-38B and 800-38C.
Comment on the 2nd Draft of SP 800-38G Rev. 1
February 3, 2025
NIST has released a second public draft (2PD) of Special Publication (SP) 800-38Gr1 (Revision 1), Recommendation for Block Cipher Modes of Operation: Methods for Format-Preserving Encryption, for public comment. The public...
Proposal to Revise SP 800-38B and SP 800-38C
January 29, 2025
NIST's Crypto Publication Review Board is proposing to update Special Publications 800-38B, "The CMAC Mode for Authentication," and 800-38C, "The CCM Mode for Authentication and Confidentiality." Submit public comments...
NIST Proposes to Standardize a Wider Variant of AES
December 24, 2024
NIST indicated its interest in vetting another Rijndael variant for approval: Rijndael with 256-bit blocks (i.e., Rijndael-256) with a single key size of 256-bits. NIST plans to develop a draft standard for Rijndael-256 over...
NIST to Revise Special Publication 800-38E
February 10, 2024
After two public comment periods, NIST has decided to revise SP 800-38E, "Recommendation for Block Cipher Modes of Operation: the XTS-AES Mode for Confidentiality on Storage Devices."
Decision to Revise NIST SP 800-38A
April 28, 2023
NIST has decided to revise SP 800-38A, "Recommendation for Block Cipher Modes of Operation: Methods and Techniques." Read this announcement for more details.
Proposal to Update NIST SP 800-38E
February 8, 2023
NIST is proposing to update Special Publication (SP) 800-38E, "Recommendation for Block Cipher Modes of Operation: the XTS-AES Mode for Confidentiality on Storage Devices." Please submit public comments by March 10, 2023.
NIST Requests Comments on Draft SP 800-38G Rev 1
February 28, 2019
NIST requests public comments on Draft SP 800-38G Revision 1, Recommendation for Block Cipher Modes of Operation: Methods for Format-Preserving Encryption. Comments are due by April 15, 2019.
NIST Released Special Publication 800-38G
March 29, 2016
NIST is pleased to announce the release of Special Publication 800-38G, Recommendation for Block Cipher Modes of Operation: Methods for Format-Preserving Encryption. This publication specifies and approves the FF1 and FF3...
Explanation of Changes to Draft SP 800-38G
June 27, 2014
Draft Special Publication 800-38G, Recommendation for Block Cipher Modes of Operation: Methods for Format-Preserving Encryption, released for public comment in July 2013, included three methods for format-preserving...
Draft Publication 800-38G
July 8, 2013
NIST is pleased to announce that Draft NIST Special Publication 800-38G, Recommendation for Block Cipher Modes of Operation: Methods for Format-Preserving Encryption, is available for public comment. Format-preserving...
NIST Special Publication 800-38F
December 21, 2012
NIST announces the release of Special Publication 800-38F, Recommendation for Block Cipher Modes of Operation: Methods for Key Wrapping. This publication describes cryptographic methods for the protection of the...
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Created January 04, 2017, Updated April 17, 2025