JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2016, Vol. 51 ›› Issue (5): 67-71.doi: 10.6040/j.issn.1671-9352.2.2015.310

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Attack on an image cipher by combining hyper chaotic sequences and shift operation

ZHU Cong-xu1, LU Qing1,2   

  1. 1. School of Information Science and Engineering, Central South University, Changsha 410083, Hunan, China;
    2. Linxiang City Public Security Bureau of Hunan Province, Linxiang 414300, Hunan, China
  • Received:2015-08-17 Online:2016-05-20 Published:2016-05-16

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Abstract: A chaos-based cryptosystem has exhibited some unconventionally excellent properties. At the same time, it is of vital significance for its advancement to give a mathematically rigorous cryptanalysis. In this study, we analyze the security of an image encryption algorithm, whose main idea is to shift the images pixel positions by using one of the improved hyperchaotic sequences, diffuse and confuse the image's pixel values by using shift cipher and other improved hyperchaotic sequences. By applying chosen plaintext attacks, we show that all the equivalent keys can be revealed, which can be exploited to reveal the plain image. Both mathematical analysis and experimental results are presented and the feasibility of the proposed chosen plaintext attack strategies is verified. Finally, some possible improved methods to increase the security of the image encryption algorithm are discussed briefly.

Key words: chaotic image cipher, cryptanalysis, chosen plaintext attack, hyper chaotic sequences, shift operation

CLC Number: 

  • TP309
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