基于整数小波变换和二维混沌系统的多图像加密算法

Multi-image encryption algorithm based on integer wavelet transformation and two-dimensional chaotic system

为提高当前混沌图像加密算法抵抗选择明文攻击的能力并减轻公用网络传输负担,提出一种基于整数小波变换和二维混沌系统的多图像加密算法。采用整数小波变换对多张明文图像进行数据压缩,对压缩以后的多张明文图像进行交叉组合,通过对同时置乱和扩散操作产生的密文图像进行动态分割,可以生成多张密文图像。所提加密算法可以抵抗选择明文攻击,实现对图像数据的压缩,通过减少图像数据的冗余度减轻信道传输的负担,提高加密速度。通过MATLAB仿真实验证实了该加密算法的正确性和实用性,该加密算法可以保证图像在公用信道中传输的安全。

To improve the ability of the current chaotic image encryption algorithm to resist attacks and to ease the public network transmission burden,a multi-image encryption algorithm based on integer wavelet transform and two-dimensional chaotic system was proposed.Several plaintext images were compressed by the integer wavelet transformation,and the compressed plaintext images were cross-combined.Multiple cipher images were obtained by dynamically cutting the cipher images generated by simultaneous scrambling and diffusion operation.The proposed encryption algorithm can not only resist the chosen-plaintext attack,but also compress the plaintext image.By reducing the image data redundancy,the burden of channel transmission is reduced and the encryption speed is improved.The correctness and practicability of the proposed encryption algorithm are verified by MATLAB simulation experiment,which can ensure the security of image transmission in the public channel.