A Robust-Fragile Watermarking Scheme for Image Authentication

In 2003, Lu et al. developed a novel fragile watermarking scheme for image authentication to against the quantization attack. Unfortunately, their scheme is not secure enough. In 2006, Liao et al. proposed two types of attack on Lu et al.\´s scheme. They pointed out that Lu et al.\´s scheme is still impractical. To achieve both the copyright protection and tamper detection of stego-image, a robust-fragile watermarking algorithm is proposed in this paper. Our proposed scheme is not only to against the quantization attack ("modification attack" and "counterfeit attack" ), but also to achieve both the copyright protection and tamper detection of stegoimage. From experimental result, we can show that the performance of our proposed scheme is better than Lu et al.\´s method.