A Hybrid-Watermarking Scheme In Wavelet Domain For Asymmetric And Symmetric Watermark Extraction

With the development of network technology, the digital products transmitted though the internet is easier to be modified or copied by attackers without authorization by the actual owner. The digital watermarking technology was presented to resolve this problem several years ago. Asymmetric digital watermarking technology is one of the investigation hotspots in the digital watermarking field.Firstly, this paper analyzes the relationship between the digital watermarking technology and the traditional encrypting technology, and then summarizes the advantages of the digital watermarking technology and the encrypting technology which can be used in our hybrid-watermarking scheme. Secondly, a hybrid-watermarking scheme is proposed that enables both asymmetric and symmetric watermark extraction by embedding public and private watermarks. Using the asymmetric extraction, anyone with the public-watermark key can extract the public watermark to verify some information. If the public watermark is destroyed by some attack, the symmetric watermark extraction allows the actual seller to extract the hidden private watermark to prove his ownership claim. Finally, it makes full use of the Hash function, error correcting code, HVS in the algorithm to strengthen the robust of the watermarking. It also uses the digital time stamp service to resist the IBM attack and expands to multicolor image area.Watermarking serial is implanted into the original image and detected by using the special tools, such as Stirmark and Matlab. We present experimental results to show the effectiveness of our proposed scheme.We can conclude that this hybrid-watermarking scheme can achieve our design goal because of the research and experiments' results as former concerned.