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In order to improve the security and encryption performance of the color image encryption method, this paper designed a color image encryption method based on chaotic systems. The MD5 algorithm generated dynamically the initial values of the designed algorithm. After decomposing the R,G and B components of one color image into three grayscale images, it used three different chaotic encryption structures to encrypt the three images. It used Feistel structure to encrypt R image, the combination of the Logistic and the Hyperhenon chaotic sequences obtained the S-box. The G image encryption structure took advantage of sequence of Lorenz chaotic system to implement replacement operation. B image encryption structure used the sequence of KWLCM chaotic system. Finally, it combined three encryption images into one image. The theoretical analysis and experimental results show that the encryption method can ensure the security of the encryption of the color image effectively. [ABSTRACT FROM AUTHOR]

This paper presented an image encryption algorithm based on hyperchaotic sequences and Feistel structure. Firstly, Kawakami mapping generated pretreatment chaotic encryption sequences to preprocess original image. Secondly, Logistic mapping generated initial values of Hyperhenon mapping. Hyperhenon mapping produced encryption sequences as S-box of Feistel structure. Thirdly, the proposed algorithm utilized Feistel structure to encrypt the pretreatment image. The experimental results show that the algorithm has a higher stability, security, and encryption efficiency. [ABSTRACT FROM AUTHOR]