基于像素位置置乱和替代的超混沌图像加密算法

针对一些基于置乱、扩散结构的混沌图像加密算法,在像素位置置乱过程中,操作简单易受攻击等不足,提出一种改进的加强型超混沌图像加密算法.在置乱过程中加入了明文反馈机制,使得置乱效果不仅与混沌序列有关,而且跟明文本身也密切相关.在像素值替代加密的过程中,同时加入了密文和明文两种反馈机制,使得密文与明文、密钥之间的关系更复杂.经理论分析及仿真结果表明,改进算法不仅可以抵御选择明文攻击和选择密文攻击,且具有更好的密码学特性.

Novel Image Encryption Algorithm Based on Hyperchaotic Chaotic System and Shuffling Scheme

In view of some problems that based on the diffusion structure chaotic image encryption algorithm, the pixel position in the process of scrambling, and being easy to be attacked, an improved reinforced chaotic image encryption algorithm is proposed. In the scrambling process by adding a expressly feedback mechanism, making the scrambling effect is not only related with the chaotic sequence, but also is closely related with the plaintext itself; in the replace pixel value of alternative encryption process, also joined the ciphertext and plaintext feedback mechanism, it is made that the relationship between the plaintext, ciphertext and keys more complex. The theoretical analysis and simulation results show that the improved algorithm not only can resist chosen plaintext and ciphertext attack, but also have better cryptographic properties.