The 128-Bit Blockcipher CLEFIA
RFC 6114
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RFC - Informational
(March 2011; No errata)
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Last updated |
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2015-10-14
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ISE
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plain text
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bibtex
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(None)
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Unknown
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No shepherd assigned
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IESG state |
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RFC 6114 (Informational)
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Responsible AD |
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Tim Polk
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rfc-ise@rfc-editor.org
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Independent Submission M. Katagi
Request for Comments: 6114 S. Moriai
Category: Informational Sony Corporation
ISSN: 2070-1721 March 2011
The 128-Bit Blockcipher CLEFIA
Abstract
This document describes the specification of the blockcipher CLEFIA.
CLEFIA is a 128-bit blockcipher, with key lengths of 128, 192, and
256 bits, which is compatible with the interface of the Advanced
Encryption Standard (AES). The algorithm of CLEFIA was published in
2007, and its security has been scrutinized in the public community.
CLEFIA is one of the new-generation lightweight blockcipher
algorithms designed after AES. Among them, CLEFIA offers high
performance in software and hardware as well as lightweight
implementation in hardware. CLEFIA will be of benefit to the
Internet, which will be connected to more distributed and constrained
devices.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This is a contribution to the RFC Series, independently of any other
RFC stream. The RFC Editor has chosen to publish this document at
its discretion and makes no statement about its value for
implementation or deployment. Documents approved for publication by
the RFC Editor are not a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6114.
Katagi & Moriai Informational [Page 1]
RFC 6114 The 128-Bit Blockcipher CLEFIA March 2011
Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document.
Table of Contents
1. Introduction ....................................................3
2. Notations .......................................................3
3. CLEFIA Algorithm ................................................4
4. CLEFIA Building Blocks ..........................................4
4.1. GFN_{d,r} ..................................................4
4.2. F-Functions ................................................6
4.3. S-Boxes ....................................................7
4.4. Diffusion Matrices .........................................9
5. Data Processing Part ............................................9
5.1. Encryption/Decryption ......................................9
5.2. The Numbers of Rounds .....................................10
6. Key Scheduling Part ............................................10
6.1. DoubleSwap Function .......................................10
6.2. Overall Structure .........................................11
6.3. Key Scheduling for a 128-Bit Key ..........................11
6.4. Key Scheduling for a 192-Bit Key ..........................11
6.5. Key Scheduling for a 256-Bit Key ..........................12
6.6. Constant Values ...........................................13
7. Security Considerations ........................................18
8. Informative References .........................................18
Appendix A. Test Vectors ..........................................19
Appendix B. Test Vectors (Intermediate Values) ....................19
Katagi & Moriai Informational [Page 2]
RFC 6114 The 128-Bit Blockcipher CLEFIA March 2011
1. Introduction
Due to the widespread use of the Internet, devices with limited
capabilities, e.g., wireless sensors, are connected to the network.
In order to realize enough security for the network, cryptographic
technologies suitable for such constrained devices are very
important. This recent technology is called "lightweight
cryptography", and the demand for lightweight cryptography is
increasing.
In order to satisfy these needs, a 128-bit blockcipher, CLEFIA, was
designed based on state-of-the-art techniques [FSE07]. CLEFIA is a
128-bit blockcipher, with key lengths of 128, 192, and 256 bits,
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