【摘要】 双图像可逆信息隐藏由于其具有更好的安全性、嵌入率和图像视觉质量，成为信息安全领域重要的研究方向。Bhardwaj等人提出了密文域上的双图像可逆信息隐藏算法，进一步提升了安全性，但是该算法嵌入秘密信息的数量有限。本文提出了一种新的嵌入策略，先将图像的每个像素分解成3个单元，并使用Paillier算法对其加密。根据改进的最大失真控制编码表，采用平均法动态地嵌入秘密信息，即每次嵌入秘密信息的位数是变化的。实验结果表明，本文的方法比Bhardwaj等人的方法嵌入率提升了0.72 bpp;与原始的最大失真控制方法相比，嵌入率提升了0.25 bpp。同时能够无损地恢复原始图像，保证其可逆性，可以满足大容量场景下隐私保护和秘密通信的双重需求。更多还原

【Abstract】 Dual-image reversible data hiding(RDH) has become an important research direction in the field of information security due to its better security, embedding rate and image visual quality. Bhardwaj et al. proposed a dual-image RDH algorithm on encrypted domain to further improve the security, but the embedding capacity of this algorithm is limited. In this paper, we propose a new embedding strategy by decomposing each pixel of an image into three units and encrypting them using the Paillier algorithm. According to the improved maximum distortion control coding table, the secret messages are embedded dynamically using the averaging method, i.e., the number of bits of secret information is varied for each embedding. The experimental results show that the embedding rate of our method is improved by 0.72 bpp compared with the method of Bhardwaj et al. and 0.25 bpp compared with the original maximum distortion control method. At the same time, the original image can be recovered losslessly, so the reversibility is guaranteed. It can meet the dual requirements of privacy protection and secret communication in high-capacity scenarios.更多还原