Abstract

Image encryption algorithm based on compound logistic chaotic system is proposed with the large amount of information, redundancy and strong correlation between pixels of image information and sensitivity to initial conditions and pseudo-randomness of chaotic system, then Lyapunov exponents of compound chaotic equations are analyzed. The encryption strength of composite chaotic system will change as the correlation of pixels change, and achieve better image encryption effect. Chaotic image encryption system based on FPGA is designed and developed according to composite chaotic image encryption algorithm, in order to improve the complexity of the chaotic system, 128-bit multiplier is used for the design.

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