【摘要】 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。更多还原

【Abstract】 To improve the security of image encryption system,an encryption algorithm based on integration of parallel subimage 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.更多还原