基于纠错码的密文域鲁棒可逆信息隐藏

针对目前密文域可逆信息隐藏(reversible data hiding in encrypted domain,RDH-ED)存在嵌入容量较低、鲁棒性差的技术难点,提出一种基于纠错码的密文域鲁棒可逆信息隐藏方法。使用纠错码对低位信息进行编码,然后构造错误图样以嵌入信息。纠错码编码会在原有的图像信息基础上增加监督码元,利用对载体图片像素的高比特位信息进行无损压缩来节余空间,以应对编码后的载体数据量扩展的问题。对于高比特位与低比特位,分别使用不同的加密算法加密,用以保证算法的解密与消息提取的可分离。将图像分块使用投票原则,提高了算法的鲁棒性。在接收端,使用校验矩阵可以准确提取消息,利用纠错码的纠错特性可以实现算法可逆。实验证明,该算法可分离且嵌入率较高,实现了载体完全可逆恢复,具体较好的鲁棒性。

Research on Robust Reversible Information Hiding in Ciphertext Domain Based on Error Correcting Code

At present, there are some technical difficulties in reversible information hiding in encrypted domain, such as low embedding capacity and poor robustness. In this paper, a robust reversible information hiding method in encrypted domain based on error-correcting codes is proposed. Error-correcting codes are used to encode low-bit information, and then error patterns are constructed to embed information. Error-correcting code coding adds supervisory symbols to the original image information, and uses lossless compression of high bit information of carrier image pixels to save space, so as to cope with the problem of expanding the amount of carrier data after encoding. For high bit and low bit, different encryption algorithms are used to ensure the separation of decryption and message extraction. The voting principle is used to segment the image, which improves the robustness of the algorithm. At the receiver, the message can be extracted accurately by using the check matrix, and the algorithm can be reversible by using the error-correcting characteristics of the error-correcting codes. Experiments show that the algorithm is separable and has a high embedding rate. It achieves complete reversible recovery of the carrier and has good robustness.