抗拼贴攻击的二值图像认证算法

为提高算法抵抗拼贴攻击的能力，本文结合块相关思想提出一种二值图像认证算法.该算法首先将每个图像块中的像素点分为“可翻转”和“不可翻转”两类，将“不可翻转”像素点 Hash 生成水印信息，用其替代相应映射块的“可翻转”像素点实现水印嵌入.通过比较图像块重构水印及提取水印的一致性判断该图像块的真实性，并结合各图像块邻域篡改特征进一步提高篡改检测性能.实验结果表明，该算法不仅提高了在替换、添加、删除攻击下的篡改检测性能，而且能够有效抵抗拼贴攻击.

Binary Image Authentication Watermarking Scheme Against Collage Attack

To improve the ability against collage attack, a watermarking scheme for binary image authentication is proposed by introducing dependence of blocks in this paper. In the proposed algorithm, all pixels in each block are divided into the flipped pixels and the unflipped ones. The watermark information of each block is generated by hashing the unflipped pixels of it, and embedded in the flipped pixels of the corresponding mapping block. The authenticity of each block is detected by comparing the consistency between the reconstructed watermark and the extracted one. The neighborhood tampering feature is used to improve the tamper detection performance. Experimental results show that the proposed algorithm can not only improve the performance of tamper detection in the general tampering such as replace, add, delete, etc., but also effectively resist collage attack.