基于排序码分多址的密文域可逆信息隐藏

为解决图像密文域可逆信息隐藏嵌入容量小的问题,通过使用码分多址的方法研究了密文域可逆信息隐藏,提出了利用排序码分多址的方法嵌入秘密信息。首先对图像进行置乱加密。然后对加密后的图像按列进行升序排列并记录排序索引。最后,使用码分多址的嵌入序列对秘密信息进行扩频编码;而后嵌入至载体图像,嵌入后再利用排序索引进行逆排序,得到携密图像。利用码分多址嵌入序列的正交特性,实现秘密信息的多层嵌入。通过仿真实验表明,算法的密文域可逆信息隐藏嵌入容量显著提高,消除了使用码分多址嵌入时图像纹理复杂度对嵌入容量的影响。

Reversible Data Hiding in Encrypted Domain Based on Sorted Code Division Multiple Access

To enhance the embedding capacity of reversible data hiding in encrypted domain, code division multiple access(CDMA) was introduced. A novel scheme is proposed in this paper by adopting sorted code division multiple access(S-CDMA). Firstly, the image was encrypted by scrambling. Then, the encrypted image was arranged in ascending order by column, and the sorting index was recorded. Finally, the secret information is spread-coded by using the embedding sequence of code division multiple access. Then the secret information can be embedded into the carrier image. And the carrier image was arranged by sorting index. The orthogonal sequences can guarantee the multi-level embedding. The results show that the proposed method can significantly increase the embedded capacity of reversible data hiding in encrypted domain, and eliminate the impact of image texture complexity on embedding capacity.