Abstract

A new image encryption scheme using the new compound chaos by selecting one of the two one-dimensional chaotic functions randomly is proposed and an image pixel permutation is described in detail, and the permutation method is the 3D baker scheme. In the scheme a new dynamic block dividing of the 3D baker scheme using the compound chaotic map is put forward. The properties of compound chaotic functions are proved rigidly. In order to improve the robustness against difference cryptanalysis and produce avalanche effect, the first two initial keys are produced by using SHA-1 HASH technology connected with plaintext image and a new feedback image encryption scheme using the new compound chaos by selecting one of the two one-dimensional chaotic functions randomly is proposed. The results from entropy analysis, difference analysis, statistical analysis, sequence randomness analysis, cipher sensitivity analysis depending on key and plaintext have proven that the compound chaotic sequence cipher can resist cryptanalytic, statistical and brute-force attacks, and especially it accelerates encryption speed.

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