基于混沌映射和POB编码的密文域可逆信息隐藏

为了解决运用预测误差扩展算法进行信息嵌入时会造成溢出问题以及加密后图像分块内仍存在一定的相关性问题,提出了基于混沌映射和置换有序二进制(permutation ordered binary,POB)编码的密文域可逆信息隐藏.首先,图像拥有者运用混沌映射系统对原始图像进行加密.然后,数据隐藏者对加密图像中的参考像素点与其相邻像素点做差值计算后,再运用POB编码进行秘密信息的嵌入.最后,接收方不仅能正确提取秘密信息,还能无损地恢复原始图像.实验结果表明,与预测误差扩展算法相比,运用POB编码进行信息嵌入时不仅能够避免移位时造成的溢出,而且会进一步破坏分块内的相关性,使得加密图像的安全性提高.因此,该算法具有更广阔的应用场景.

Reversible Data Hiding in Encrypted Domain Based on Chaotic map and POB encoding

In order to solve the problem of overflow caused by the use of prediction error expansion algorithm for information embedding and correlated problem in the image block after encryption, a reversible data hiding in the encrypted domain based on chaotic map and POB encoding is proposed. First, the image owner can use the chaotic mapping system to encrypt the original image. Then, the data hider makes a difference between the reference pixel in the encrypted image and its neighboring pixels, and then uses POB encoding to embed secret information. Finally, the receiver can not only extract the secret information correctly, but also restore the original image without loss. Experimental results show that, compared with the prediction error expansion algorithm, the use of POB coding for information embedding can not only avoid overflow caused by shifting, but also further destroy the correlation within the block, so that the security of the encrypted image is improved. Therefore, the algorithm has a broader application scenario.