一种基于超混沌系统的双图关联加密算法

针对现存混沌图像加密算法中存在系统安全性不高、无法抵御明文攻击、加密图像相互独立、效率低等问题，提出了一种基于超混沌系统的双图关联加密算法。首先根据明文图像，由超混沌系统产生与之相关的混沌随机矩阵，对明文图像进行深度扩散；选取其中一幅图像进行明文关联的置乱操作与快速比特扩散生成密文◢c▼1▽；之后对剩余图像进行自适应关联比特操作生成密文c▼2▽，完成双图关联的图像加密。实验结果与仿真分析表明，该算法不仅具有更高的效率与更强的抗明文攻击能力，而且仅由一幅密◣文不能得到与之相应的明文图像，安全性更高，具有良好的应用场景。

Double-image correlation encryption algorithm based on hyper-chaotic system

Among the existing chaotic image encryption algorithms, there are problems such as low system security, inability to resist plaintext attacks, independent of encrypted images, and low efficiency. This paper proposed a double-graph association encryption algorithm based on a hyper-chaotic system. At first, it used a hyper-chaotic system together with the secret key to generate the key chaotic random matrix for image encryption. Then it masked plain images by the diffusion process. After that, it selected the first image to perform operations of plaintext-related scrambling and fast bit diffusion to generate cipher image. Finally, it subjected the remaining images to an adaptive correlation bit operation to generate a cipher image. Simulate results and comparative analysis show that the proposed image cryptosystem has the characteristics of large key space, the faster encryption/decryption speed, the higher sensitivity, the better statistical properties of cipher image, and etc. And the corresponding plaintext image cannot be obtained by only one cipher image. Therefore, the application prospect is greater.