Cryptanalysis of a chaotic block cipher with external key and its improved version

Li, CQ, Li, SJ, Alvarez, G, Chen, G and Lo, K-T (2008) Cryptanalysis of a chaotic block cipher with external key and its improved version Chaos Solitons and Fractals, 37 (1). 299 - 307. ISSN 0960-0779

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Abstract

Recently, Pareek et al. proposed a symmetric key block cipher using multiple one-dimensional chaotic maps. This paper reports some new findings on the security problems of this kind of chaotic cipher: (1) a number of weak keys exist; (2) some important intermediate data of the cipher are not sufficiently random; (3) the whole secret key can be broken by a known-plaintext attack with only 120 consecutive known plain-bytes in one known plaintext. In addition, it is pointed out that an improved version of the chaotic cipher proposed by Wei et al. still suffers from all the same security defects.

Item Type:	Article
Additional Information:	NOTICE: this is the author’s version of a work that was accepted for publication in Chaos Solitons and Fractals. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chaos Solitons and Fractals, 37(1), 2008, DOI 10.1016/j.chaos.2006.08.025.
Related URLs:	Author
Divisions:	Faculty of Engineering and Physical Sciences > Computing Science
Depositing User:	Symplectic Elements
Date Deposited:	30 May 2012 20:33
Last Modified:	23 Sep 2013 19:26
URI:	http://epubs.surrey.ac.uk/id/eprint/532473

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