Cryptology ePrint Archive: Report 2004/291

The Rabbit Stream Cipher - Design and Security Analysis

Martin Boesgaard and Thomas Pedersen and Mette Vesterager and Erik Zenner

Abstract: The stream cipher Rabbit was rst presented at FSE 2003 [6]. In the paper at hand, a full security analysis of Rabbit is given, focusing on algebraic attacks, approximations and di erential analysis. We determine the algebraic normal form of the main nonlinear parts of the cipher as part of a comprehensive algebraic analysis. In addition, both linear and nonlinear approximations of the next-state function are presented, as well as a differential analysis of the IV-setup function. None of the investigations have revealed any exploitable weaknesses. Rabbit is characterized by high performance in software with a measured encryption/decryption speed of 3.7 clock cycles per byte on a Pentium III processor.

Category / Keywords: secret-key cryptography / Stream cipher, fast, non-linear, coupled, counter

Publication Info: Also published in workshop record of SASC 2004

Date: received 5 Nov 2004

Contact author: ez at cryptico com

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Version: 20041105:191037 (All versions of this report)

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