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

Author

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  • Li, Chengqing
  • Li, Shujun
  • Alvarez, Gonzalo
  • Chen, Guanrong
  • Lo, Kwok-Tung

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.

Suggested Citation

  • Li, Chengqing & Li, Shujun & Alvarez, Gonzalo & Chen, Guanrong & Lo, Kwok-Tung, 2008. "Cryptanalysis of a chaotic block cipher with external key and its improved version," Chaos, Solitons & Fractals, Elsevier, vol. 37(1), pages 299-307.
    • Handle: RePEc:eee:chsofr:v:37:y:2008:i:1:p:299-307
    DOI: 10.1016/j.chaos.2006.08.025
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    Cited by:

    1. Mazloom, Sahar & Eftekhari-Moghadam, Amir Masud, 2009. "Color image encryption based on Coupled Nonlinear Chaotic Map," Chaos, Solitons & Fractals, Elsevier, vol. 42(3), pages 1745-1754.
    2. Han, S. & Chang, E. & Dillon, T. & Hwang, M. & Lee, C., 2009. "Identifying attributes and insecurity of a public-channel key exchange protocol using chaos synchronization," Chaos, Solitons & Fractals, Elsevier, vol. 40(5), pages 2569-2575.
    3. Zaher, Ashraf A., 2009. "An improved chaos-based secure communication technique using a novel encryption function with an embedded cipher key," Chaos, Solitons & Fractals, Elsevier, vol. 42(5), pages 2804-2814.

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