基于ZUC可分离加密图像可逆水印算法

本文基于祖冲之(ZUC)算法,设计实现了一种可分离加密图像可逆水印算法,算法中内容所有者先进行图像标记并生成位置图,然后使用ZUC加密算法加密载体图像;水印嵌入者得到加密图像后根据位置图将水印信息嵌在选中像素的第7位或第8位;接收者根据加密密钥和嵌入密钥可以得到直接解密图像、水印信息和恢复图像.算法使用ZUC算法对图像进行加解密,很好地保证算法的安全性;在嵌入水印信息之前对图像进行标记,将水印信息嵌在选中的位置上;接收者在利用相邻像素相关性基础上通过一种自适应差值算法实现水印提取和图像恢复,保证恢复的载体图像和直接解密图像的质量.实验表明所提出的算法具有较高的安全性并且达到可分离的效果,同时恢复的载体图像和直接解密图像都具有较高质量.

Reversible Watermarking Algorithm for Separable Encrypted Image Based on ZUC

Based on the ZU Chongzhi (ZUC) algorithm, this study designs and implements a reversible watermarking algorithm for separable encrypted images. In the algorithm, the content owner first marks the image to produce a position map and then runs the ZUC encryption algorithm to encrypt the original image. After the watermark embedder obtains the encrypted image, the watermark information is embedded into the second most significant bit or the most significant bit position of the selected pixels according to the position map. Through the encryption key and the embedding key, the receiver can get the directly decrypted image, watermark information, and the recovered image. The ZUC algorithm is adopted to encrypt and decrypt the image to ensure the security of the algorithm. The image was marked before the watermark information is embedded in the selected positions. The receiver employs an adaptive difference algorithm based on the correlation between adjacent pixels to extract watermarks and restore the image, ensuring the quality of the recovered original image and the directly decrypted image. Experiments show that the proposed algorithm has high security and achieves a separable effect. At the same time, the recovered original image and the directly decrypted image also have high quality.