并行图像耦合超混沌系统的图像加密算法

摘要

To improve the security of image encryption system,an encryption algorithm based on integration of parallel sub-image and hyper-chaotic system was proposed.Firstly,the initial plaintext was separated and scrambled using Logistic map image to change the position of sub-images.And then Logistic map was used for the image row,column position was scrambled to change the position of the sub-image pixel values.Secondly,Lorenz system and Chen system were combined to diffuse each sub-image encryption to change their pixel values.Finally,all the encrypted sub-images were combined to form a complete cipher text.The simulation results show that the proposed encryption algorithm has high security,large key space,key sensitivity,and it can improve the anti-attack capability.%为有效增强图像加密系统的安全性，提出一种基于并行子图像与超混沌相结合的加密算法。采用Logistic映射对初始明文图像进行分离及置乱，改变子图像的位置，根据该映射迭代计算得到的序列，置乱子图像像素矩阵的行与列，改变其像素的位置；将Lorenz系统和Chen系统结合起来，对每个子图像分别进行扩散加密处理，改变它们的像素值；将加密完后的子图像进行重组，输出密文。仿真结果表明，该算法安全性高、密钥空间大、密钥敏感性强，可显著提高抗攻击能力。