As image is an important way of information representation, researchers pay more and more attention on image encryption. In order to improve the performance of image encryption, a novel image encryption scheme based on a hybrid cascaded chaotic system and sectoral segmentation is proposed in this paper. Hybrid cascaded chaotic system has a larger key space, higher complexity, more sensitivity to initial conditions. Four chaotic sequences relevant to a plain image are generated by this system, which strengthen plaintext correlation and the randomness. During the scrambling process, sectoral segmentation focuses on how to extract a sequence from the disk storing data, which can not only reduce the correlation between the three components of the image, but also hide image information to a large extent. Further, a DNA algorithm is used in the diffusion process. Simulation shows that the proposed scheme can effectively resist various attacks and improve the encryption performance.

中文翻译：

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基于混合级联混沌系统的彩色图像加密方案

由于图像是一种重要的信息表示方式，因此研究人员越来越重视图像加密。为了提高图像加密的性能，本文提出了一种基于混合级联混沌系统和扇区分割的图像加密方案。混合级联混沌系统具有更大的密钥空间、更高的复杂度、对初始条件更敏感。该系统生成与一张普通图像相关的四个混沌序列，增强了明文的相关性和随机性。在加扰过程中，扇区分割的重点是如何从存储数据的磁盘中提取出一个序列，这样既可以降低图像三分量之间的相关性，又可以在很大程度上隐藏图像信息。进一步，在扩散过程中使用了 DNA 算法。仿真表明，该方案可以有效抵抗各种攻击，提高加密性能。