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A novel image block encryption algorithm based on three-dimensional Chen chaotic dynamical system is proposed in this paper. The algorithm works on 32-bit image blocks with a 192-bit secret key. The main idea is that the key is employed to drive the Chen's system to generate a chaotic sequence that is inputted to a specially designed function G, in which we use new 8x8 Sboxes generated by chaotic maps in (Tang, 2005) . In order to improve the robustness against difference cryptanalysis anddoi:10.4018/jcini.2011010104 fatcat:ll4aljy42nhnvm4vsdvimq2cri