TD-ERCS混沌系统和提升小波相结合的图像加密方法

Image encryption algorithm based on tangent-delay ellipse reflecting cavity map system and lifting wavelet transform

为有效解决数字图像在通信传输中安全性的问题,提出了一种基于TD-ERCS混沌系统和提升小波理论相结合的数字图像加密方法。该方法首先对数字图像进行提升小波变换,得到数字图像的子带图像。然后,利用TD-ERCS混沌系统生成混沌序列对子带图像进行置换加密。数字图像的接受方在接收到加密的子带图像后,可以采用解密算法还原子带图像并在接收端重构原始数字图像。最后,对算法的安全性进行理论分析和计算机仿真。实验结果表明,该方法对数字图像加密具有良好的安全性。

To solve the security problem of transmission image across public networks,an image encryption algorithm based on TD-ERCS and lifting wavelet transform is proposed.Firstly,the image is decomposed by lifting wavelet transform horizontally and vertically,and subband images are gotten.Then,according to the sort permutation and the binary XOR operation from the TD-ERCS chaotic series,it can achieve the encryptions of the subband images.After the image recipient receives the encryption subband images,it correctly restore the subband images by decryption algorithm and reconstruct the original images at the receiving end.Finally,The algorithm security is carried out with theory analysis and computer simulation.The experiment results show that the encryption algorithm based on TD-ERCS and lifting wavelet transform is valid and has higher security.