改进的魔方原则耦合混沌密文矩阵的图像加密算法

Image Encryption Algorithm Based on Improved Magic Cube Transformation and Chaotic Cipher Matrix

为了解决当前基于混沌系统加密算法存在的密钥空间小,算法安全性不佳的难题,提出改进的魔方原则耦合混沌密文矩阵的图像加密算法.首先,迭代Logistic映射,生成混沌序列,利用改进的魔方原则,对明文图像进行置乱,扰乱像素位置;随后,利用扰乱像素矩阵,采用XOR算子,构造像素扩散模型,对置乱图像进行加密,改变像素值.仿真结果显示,与当前基于混沌系统的图像加密算法相比,提出的算法具有更大的密钥空间,鲁棒性更强.

In order to solve these problems such as small key space resulting in low security of image encryption algorithm based on chaotic system, the new image encryption algorithm is designed based on improved magic cube transformation and chaotic cipher matrix in this paper. Firstly, the plaintext image is permutated by improved magic cube principle to scramble the position of pixel; then the permutation image is diffused by constructing chaotic cipher matrix and combination with the XOR operator to change the pixel value; Finally, the corresponding decryption algorithm is also proposed. Simulation results show that this algorithm has bigger key space, as well as stronger robustness compared with these algorithms based on chaotic system.