基于像素交叉循环移位与混沌映射的图像加密

Image Encryption Algorithm Based on Pixel Cross Cyclic Shift and Controlling Chaotic Mapping

提出基于像素交叉循环移位与自控混沌映射的图像加密算法。迭代均布Logistic映射,输出密钥;根据明文像素与密钥设计像素交叉循环移位机制,并对明文像素进行高度置乱;利用均布Logistic映射生成Tent映射的初始条件,再通过像素扩散机制的定义完成像素加密;引入重力模型来构造深度扩散机制,然后最大化密文的统一平均变化强度,从而提高算法的抗攻击能力。结果表明:与当前图像加密技术相比,所提算法具有更高的安全性以及更强的抗攻击能力。

An image encryption algorithm based on pixel cross cyclic shift and controlling chaotic mapping was proposed.The key was outputted by iterating the Logistic map.According to the plaintext pixels and key,a pixel cross circulation shift mechanism was designed to scramble the plaintext pixels.Then the initial condition of Tent map was generated by using the Logistic map,and the pixel diffusion mechanism was defined to encrypt the image pixels.Finally,the depth diffusion mechanism was constructed by introducing the gravity model for the maximum unified average changing intensity value of cipher to improve the anti-attack ability.Experimental results showthat the proposed algorithm has higher security and stronger anti-attack capability compared with the existing image encryption technology.