A New Watermarking Attack Using Long-Range Correlation Image Restoration

In this paper, we propose a new method for damaging and destroying robust invisible watermarks using an image restoration technique which is called long-range correlation. The restoration technique is based on the concept of the general long-range correlation within natural images. First we add some random noise to the watermarked image, and then by using the restoration technique we restore the destroyed pixels. Restored image has high correlation with the watermarked image but due to some modifications that the restoration process made in the watermarked image, the hidden watermark is destroyed. We have tested the proposed method to attack two recent and robust watermarking methods and the results sound impressive. PSNR of the watermarked image after applying the proposed attack is more than 45 dB and the NC for the extracted watermark is lower than 0.4, so it is not detectable. Moreover, the proposed method does not consider any knowledge about the underlying watermarking algorithm.