基于脆弱数字水印的人脸图像的安全性

针对人脸识别系统中人脸图像数据可能受到攻击，导致人脸图像被恶意添加、替换、篡改等安全隐患，采用脆弱数字水印方法，解决上述人脸识别系统中人脸图像数据安全问题．用人脸原始图像的小波低频系数的高7位生成低频压缩图像，作为水印．通过混沌置乱加密，将水印直接嵌入到原始人脸图像的最低有效位平面，区分人脸图像篡改并定位检测．实验结果表明，采用脆弱数字水印的人脸图像对恶意添加、替换、篡改都有很高的敏感度．嵌入脆弱数字水印对人脸图形的特征提取的识别率以及识别速度的影响都很小．

Safety of Facial Images Based on Fragile Digital Watermarking

Fragile digital watermarking for facial image authentication was applied to oppose various attacks to facial images,such as tamper,substitution and addition and to improve the security of facial images.The water mark is obtained by converting the 7 most significant bits(MSB) of the low-frequency wavelet coefficients of the original image into a binary sequence.The water mark is scrambled by a chaotic key,and embedded into the least significant bits(LSB) of the original facial image to detect tamper and the tampered zone.Experimental results show that the facial image with fragile digital watermarks formed by the proposed method is highly sensitivity to tamper,substitution and addition.The embedded fragile digital watermarks have a little negative effect on feature extraction,detection rate and detection speed during face recognition.