基于差分网格的抗RSD攻击盲指纹方案

Blind fingerprint scheme against RSD attacks based on differential grid

为了提高数字指纹的抗综合攻击能力,构造了抗旋转、缩放、扭曲攻击(简记为RSD攻击)的数字指纹嵌入和提取策略。设计了数字指纹的空域—DCT域联合嵌入方案,给出了差分特征点的构造方法,以及基于差分特征点网格的数字指纹嵌入与提取算法,设计了高精度攻击参数辨识算法。实验结果表明,所提方案攻击参数辨识精度达到亚像素级,能抵抗缩放系数大于0.5的缩放攻击,45°角以内的任意旋转攻击,以及25°角以内的任意扭曲攻击;且指纹提取效果并不因旋转角度的增大而降低,也不因扭曲角度的增大而有明显降低。该方案提高了数字指纹的鲁棒性,使数字指纹系统在能抵抗去除攻击,剪切、平移、粘贴攻击(简称CTP攻击)的同时具备抵抗RSD攻击的能力。

The construction of digital fingerprint embedding and acquisition scheme for anti-rotation, anti-scaling and anti-distortion attack can improve the anti-attack capability of the digital fingerprint. The designed spatial-DCT （ Discrete Cosine Transform） domain combinational embedding scheme of digital fingerprint provided the construction of differential characteristic point, on which the digital fingerprint embedding and acquisition algorithm was proposed. And an attack parameter recognition algorithm with high accuracy was presented. The simulation results show that the accuracy of attack recognition algorithm can be the order of sub-pixel and can resist the scaling attack with parameter larger than 0.5, any rotation attack with angle less than 45° and any distortion attack with angle less than 25°. In addition, the effect of the proposed scheme would not decrease with the increase of the rotation and distortion angle. The proposed scheme improves the robustness of the digital fingerprint and enables the digital fingerprint system to resist the removal and CTP （ cutting, trimming, pasting） attack as well as RSD （rotation, scaling, distoration） attack.