具有鲁棒性与数据嵌入能力的JPEG压缩图像加密算法

Robust JPEG compression image encryption algorithm with information embedding feature

针对JPEG图像加密算法引起的比特流大小增加与鲁棒性较差的问题,提出了一种具有鲁棒性与数据嵌入能力的JPEG图像格式兼容的加密算法。利用AC系数抓取纹理信息并生成部分区域,基于该区域将DC系数编码,使用八个不同的顺序扫描AC系数,选择其中比特流大小最小的顺序,并提取每块的AC系数,操作AC系数来增加置换的范围。算法的主要过程均具有可逆性,可成功提取嵌入信息并且完美地重建原图像。基于真实JPEG照片的实验结果表明,本算法对素描攻击具有鲁棒性,可抑制比特流大小增加且具有数据嵌入的能力。

Aimed at the problem that the improvement of the bit stream size and robust feature which cased by JPEG image encryption algorithm, this paper proposed a robust JPEG compression image encryption algorithm with information embedding feature.Firstly, it used AC coefficients to capture texture information and generated regions, and coded the DC coefficients based on the regions. Then, it used 8 different orders to scan AC coefficients, and selected the smallest bit stream size. It extracted the AC coefficients of each block, and operated it to enlarge the scope of permutation. The main part of the proposed algorithmwas reversible, and the embedded information could be extracted and reconstructed the origin image perfectly. Experiment results with real JPEG images show that the proposed algorithm is robust against the sketch attack, and has the ability of suppression of bit stream size increment and data embedding.