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Cryptanalysis of two chaotic encryption schemes based on circular bit shift and XOR operations

Li, CQ, Li, SJ, Alvarez, G, Chen, GR and Lo, KT (2007) Cryptanalysis of two chaotic encryption schemes based on circular bit shift and XOR operations Physics Letters. Section A: General, Atomic and Solid State Physics, 369 (1-2). 23 - 30. ISSN 0375-9601

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Abstract

Recently two encryption schemes were proposed by combining circular bit shift and XOR operations, under the control of a pseudorandom bit sequence (PRBS) generated from a chaotic system. This Letter studies the security of these two encryption schemes and reports the following findings: (1) there exist some security defects in both schemes; (2) the underlying chaotic PRBS can be reconstructed as an equivalent key by using only two chosen plaintexts; (3) most elements in the underlying chaotic PRBS can be obtained by a differential known-plaintext attack using only two known plaintexts. Experimental results are given to demonstrate the feasibility of the proposed attack.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Physics Letters A. 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 Physics Letters A, 369(1-2), September 2007, DOI 10.1016/j.physleta.2007.04.023.
Uncontrolled Keywords: chaos, encryption, delayed chaotic neural network, cryptanalysis, chosen-plaintext attack, known-plaintext attack, differential cryptanalysis, NEURAL-NETWORKS, CRYPTOGRAPHY, SYSTEMS
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Divisions: Faculty of Engineering and Physical Sciences > Computing Science
Depositing User: Symplectic Elements
Date Deposited: 30 May 2012 20:42
Last Modified: 23 Sep 2013 19:26
URI: http://epubs.surrey.ac.uk/id/eprint/532481

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