Copyright protection using digital watermarking

The digital techniques have greatly smooth data representation and data storage. However, the content of the data without distortion is easy to edit and copy in digital media, and this situation has resulted in a series of security problems over the widespread of using the network. For example, users can easily access, edit, or distribute data in digital media. Therefore, how to guarantee copyright protection and the integrity of the content of digital media has become an emergent issue. Digital watermarking has been proposed as a solution to the problem of resolving copyright ownership of multimedia data (image, audio, and video). In this thesis, we have proposed a copyright protection using private watermarking algorithm. The algorithm is based on multi techniques of frequency domain such as: Two Dimensional Discrete Cosine Transform and Multi-Level Two Dimensional Discrete Wavelet Transform. The proposed algorithm is built by using the secret key which is coded in the embedding side by using the secure hash algorithm (SHA-1) to increase the security of the proposed study. In this thesis, we used some fidelity criteria (such as: the peak signal to noise ratio, the normalized cross correlation and the normalized hamming distance) for measuring the performance on some different standard gray scale images. The robustness of the proposed algorithm was tested on different types of noises.