A new chaos-based fast image encryption algorithm

In recent years, various image encryption algorithms based on the permutation–diffusion architecture have been proposed where, however, permutation and diffusion are considered as two separate stages, both requiring image-scanning to obtain pixel values. If these two stages are combined, the duplica...

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Bibliographic Details
Published inApplied soft computing Vol. 11; no. 1; pp. 514 - 522
Main Authors Wang, Yong, Wong, Kwok-Wo, Liao, Xiaofeng, Chen, Guanrong
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2011
Subjects
Cryptography
Image encryption
Information security
Spatiotemporal chaos
Image encryption
Cryptography
Information security
Spatiotemporal chaos
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Summary:In recent years, various image encryption algorithms based on the permutation–diffusion architecture have been proposed where, however, permutation and diffusion are considered as two separate stages, both requiring image-scanning to obtain pixel values. If these two stages are combined, the duplicated scanning effort can be reduced and the encryption can be accelerated. In this paper, a fast image encryption algorithm with combined permutation and diffusion is proposed. First, the image is partitioned into blocks of pixels. Then, spatiotemporal chaos is employed to shuffle the blocks and, at the same time, to change the pixel values. Meanwhile, an efficient method for generating pseudorandom numbers from spatiotemporal chaos is suggested, which further increases the encryption speed. Theoretical analyses and computer simulations both confirm that the new algorithm has high security and is very fast for practical image encryption.
ISSN:1568-4946
1872-9681
DOI:10.1016/j.asoc.2009.12.011