面向云计算安全应用的密文图像可逆信息隐藏算法

Reversible data-hiding algorithm in encrypted image for security application in cloud computing

针对目前密文图像可逆信息隐藏算法容量较小的缺点,通过引入云计算服务,基于矩阵的奇异值分解,提出了一种面向云计算安全应用的密文图像可逆信息隐藏算法。该算法利用云端强大的计算和存储能力,对密文图像的某些比特平面(LSB-planes)进行奇异值分解,并存储产生的恢复字典,然后将信息直接嵌入奇异值矩阵中。实验结果表明,该算法在保证图像隐私安全和图像失真度很低的前提下,在嵌入容量上有明显提高,提取信息后图像能够完全恢复,并且信息提取与图像恢复可分离。与其他算法相比,该算法具有更高的嵌入容量。

Aiming at the low capacity of reversible data-hiding algorithm in encrypted images, by introducing the cloud computing service, and based on the singular value decomposition of matrix, this paper proposed a reversible data-hiding algorithm in encrypted image for security application in cloud computing. This algorithm utilized the powerful computing and storage of cloud to complete the singular value decomposition of some selected planes of the cipher image, stored the recovery dictionary generated, and directly embedded the information into the singular value matrix. Experimental results show that under the precondition of ensured image privacy security and higher image fidelity, the embedding capacity is significantly improved, images can be fully recovered after information extraction, aud information extraction and image restoration are separable. Compared with other algorithms, it has higher embedding capacity.