适用于多区域篡改的JPEG图像认证算法

利用纠错编码的陪集分解原理,给出了一种从长度为2m-1的二进制信息序列中提取m比特摘要的方法,证明了JPEG压缩引起图像块均值失真的一个上界,并据此提出一种新的图像预处理方法。在此基础上,设计了一种新的基于数字签名的近似图像认证算法。在JPEG质量因子大于等于25的情况下,该算法可以区分篡改和正常压缩失真；在多区域篡改的情况下,该算法可以实现篡改检测和准确定位,且具有较高的篡改检测概率和较低的虚警概率。理论分析和仿真实验均证明了该算法的正确性和有效性。

New JPEG image authentication algorithm applied to multi-region tampering

A new method of distilling m bits abstract from the binary information sequence with the length of 2m-1 was proposed based on the coset decomposing theory of correct error coding.An important conclusion was proved that distortion of image block mean caused by JPEG lossy compression has a maximal value;a new image pre-processing method based on the conclusion was introduced and analyzed.Based on those,a new image authentication algorithm based on digital signature was proposed.It can distinguish between JPEG...