关键词: 混沌系统, 图像加密, 混沌序列, Kent映射

Abstract: In order to protect digital images information, a chaotic image encryption algorithm based on slider and matrix rotation is proposed. Firstly, in the process of pixels position global scrambling, these parameters to control the chaotic system are generated base on the characteristics of the plaintext image, and therefore it is closely related to the plaintext image. Secondly, the image sub-matrix block is rotated to scramble the entire image so that all pixels are uniformly distributed. Finally, in the process of pixel value substitution, the slider encryption method allowes the encryption result of each pixel to affect several other pixels within the slider, which ensures the encryption results of all pixels are interrelated, and improves the security of encrypted image. The experimental results show that the encryption algorithm can not only effectively resist the statistical attack and differential attack, but also achieve high security and good encryption effect.

Key words: chaotic systems, image encryption, chaotic sequence, Kent map