Attack on "Watermarking Method Based on Significant Difference of Wavelet Coefficient Quantization"

This letter describes an attack on the recently proposed "Watermarking Method Based on Significant Difference of Wavelet Coefficient Quantization" by Lin et al. While the method is shown to be robust against many signal processing operations, security of the watermarking scheme under intentional attack exploiting knowledge of the implementation has been neglected. We demonstrate a straightforward attack which retains the fidelity of the image. The method is therefore not suitable for copyright protection applications. Further, we propose a countermeasure which mitigates the shortcoming.