Using the Wavelet as the Private Key for Encrypting the Watermark |
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| Authors: | YANG Xiaofan WU Zhongfu LIAO XiaofengCollege of Computer Science Chongqing University Chongqing PR China |
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| Institution: | YANG Xiaofan,WU Zhongfu,LIAO XiaofengCollege of Computer Science,Chongqing University,Chongqing 400044,P.R. China |
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| Abstract: | Watermarking is an effective approach to the copyright protection of digital media such as audio, image, and video. By inspiration from cryptography and considering the immensity of the set of all possible wavelets, it is presented that in wavelet domain watermarking, the associated wavelet can be considered as the private key for encrypting the watermark so as to enhance the security of the embedded mark. This idea is partly supported by the fact that from computational complexity viewpoint, it is very time-consuming to search over the immense set of all candidate wavelets for the right one if no a priori knowledge is known about it. To verify our proposal, the standard image "Lena" is first watermarked in a specific wavelet domain, the watermark recovery experiments are then conducted in the wavelet domain for a set of wavelets with the one used for mark embedded in it,separately. It follows from the experimental results that the mark can be recovered only in the right wavelet domain, which justifies the suggestion. |
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| Keywords: | Digital watermark Watermarking Cryptography Private key cryptographic system Wavelet Daubechies wavelet |
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