A new chaos-based fast image encryption algorithm |
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| Authors: | Yong Wang Kwok-Wo Wong Xiaofeng Liao Guanrong Chen |
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| Affiliation: | 1. Key Laboratory of Electronic Commerce and Logistics of Chongqing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;2. Department of Electronic Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong, China;3. Department of Computer Science and Engineering, Chongqing University, Chongqing 400044, China;1. Engineering, Architecture and Design Faculty, Autonomous University of Baja California (UABC), Ensenada, BC, Mexico;2. Electronics and Telecomunications Department, Scientific Research and Advanced Studies Center of Ensenada (CICESE), Ensenada, BC, Mexico;3. Information and Communication Technologies Department, Technological University of Tijuana (UTT), Tijuana, BC, Mexico;1. Ecole polytech – University of Nantes-Rue Christian Pauc-44306, Nantes cedex 3, France;2. College of Information Technology and Computer Engineering- Palestine Polytechnic University-Palestine |
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| Abstract: | 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. |
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