An improved image encryption algorithm based on chaotic maps |
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Authors: | Xu Shu-Jiang Wang Ji-Zhi and Yang Su-Xiang |
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Institution: | School of Statistics and Mathematics, Shandong Economic
University, Jinan 250014, China; Shandong Computer Science Center, Jinan 250014, China |
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Abstract: | Recently, two chaotic image encryption schemes have been proposed,
in which shuffling the positions and changing the grey values of
image pixels are combined. This paper provides the chosen plaintext
attack to recover the corresponding plaintext of a given ciphertext.
Furthermore, it points out that the two schemes are not sufficiently
sensitive to small changes of the plaintext. Based on the given
analysis, it proposes an improved algorithm which includes two
rounds of substitution and one round of permutation to strengthen
the overall performance. |
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Keywords: | chaos chaotic cryptosystem image encryption chosen plaintext attack |
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