The 128-Bit Blockcipher CLEFIA
RFC 6114
Document | Type |
RFC - Informational
(March 2011; No errata)
Was draft-katagi-clefia (gen)
|
|
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Author | Masanobu Katagi | ||
Last updated | 2015-10-14 | ||
Stream | ISE | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | ISE state | (None) | |
Consensus Boilerplate | Unknown | ||
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6114 (Informational) | |
Telechat date | |||
Responsible AD | Tim Polk | ||
Send notices to | rfc-ise@rfc-editor.org |
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, which is compatible with the interface of AES [FIPS-197]. Since the cipher algorithm was published in 2007, its security has been scrutinized in the public community, but no security weaknesses haveShow full document text