基于JPEG压缩不变量和半脆弱水印的图像认证

Image Authentication Scheme Based on JPEG Invariant and Semi-fragile Watermarking

为了检测和定位对图像的恶意窜改,同时验证图像的所有权,提出了一种基于JPEG压缩不变量和半脆弱水印的JPEG压缩域认证水印算法.该算法利用了JPEG压缩前后DCT系数的不变性嵌人和图像内容有关的水印.该认证算法建立在密码学方法的基础上,因此它是单向的、不可逆的.

The authors propose an authentication scheme for JPEG images based on digital signature and semi-fragile watermarking to detect and locate the malicious manipulations made to an image and verify the ownership of the image. The algorithm uses the invariant of DCT coefficients before and after JPEG compression to embed the watermark related with the image in content. Since the authentication scheme is based on the security of the cryptographic hash function and public key algorithm, it is monodirectional and irreversible. The theoretical analysis and experimental results show that the proposed scheme has the desired property and good performance for image authentication.