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

Chengqing Li; Shujun Li; Gonzalo Álvarez; Guanrong Chen; Kwok-Tung Lo

doi:10.1016/j.physleta.2007.04.023

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

Chengqing Li·Shujun Li·Gonzalo Álvarez·Guanrong Chen·Kwok-Tung Lo

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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 paper 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.

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Chengqing Li, Shujun Li, Gonzalo Álvarez, Guanrong Chen, Kwok-Tung Lo. 2007-07-07. Cryptanalysis of two chaotic encryption schemes based on circular bit shift and XOR operations. https://doi.org/10.1016/j.physleta.2007.04.023

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