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Zbl 1196.94057
Li, Shujun; Mou, Xuanqin; Cai, Yuanlong; Ji, Zhen; Zhang, Jihong
On the security of a chaotic encryption scheme: problems with computerized chaos in finite computing precision. (English)
[J] Comput. Phys. Commun. 153, No. 1, 52-58 (2003). ISSN 0010-4655

Summary: Zhou et al. have proposed a chaotic encryption scheme, which is based on a kind of computerized piecewise linear chaotic map (PWLCM) realized in finite computing precision. In this paper, we point out that Zhou's encryption scheme is not secure enough from strict cryptographic viewpoint. The reason lies in the dynamical degradation of the computerized piecewise linear chaotic map employed by Zhou et al. The dynamical degradation of the computerized chaos induces many weak keys to cause large information leaking of the plaintext. In addition, we also discuss three simple countermeasures to enhance the security of Zhou's cryptosystem, but none of them can essentially enhance the security.

MSC 2000:: *94A60 Cryptography

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