基于低有效位数值排序的密文域可逆信息隐藏

提出了一种基于低有效位数值排序的密文域可逆信息隐藏方法。该方法首先对像素信息进行位平面划分,然后对非重叠像素块的低有效位进行数值排序实现秘密信息的可逆嵌入,同时利用排序结果提取排序特征。整个加密过程中对不同位平面采用不同的加密机制,对低有效位进行Josephus映射加密,将映射对应的低有效位排序特征作为混沌序列控制变量再对高有效位进行logistic加密。利用低有效位像素值排序,不仅能够实现信息提取与图像恢复的可分离操作,而且可以驱动排序特征控制整个高有效位加密过程,从而提高图像加密的安全性。

An Efficient Reversible Data Hiding Scheme in Encryption Domain Based on Lower-Significant-Bit Value Ordering Method

This paper proposes a reversible data hiding method in encryption domain based on lower-bit pixel value ordering. Firstly, the pixel information is divided by bit planes. Then the low-significant-bits of non-overlapping pixel blocks are sorted by pixel value to realize the reversible embedding of secret information. During the whole encryption process, different encryption mechanisms are used for different bit planes. The low-significant-bits are encrypted by Josephus mapping, and the ranking features of the low-significant-bits corresponding to the mapping are taken as the control variables of the chaotic sequence. The high-significant-bits are encrypted by Logistic method finally. Using low-significant-bit pixel value sorting method can not only realize the separation of information extraction and image restoration, but also drive sorting features to control the whole high-significant-bit encryption process, thereby improving the security of image encryption.