Krunal N. Patel - Robust and Secured Digital Audio Watermarking: Using a DWT-SVD-DSSS Hybrid Approach

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Today, the use of digital data like image, audio, and video is tremendously increasing due to the advancement in technology and the Internet revolution. With these advancements, attaining ones ownership and copyrights for this digital data is the biggest challenge. Digital watermarking is one of the technique to attain ones ownership and copyrights securely. It is the technique in which the owners copyright information can be embedded into the original media in the form of an image, audio, text, or video. There are two main factors we need to observe for digital audio watermarking to maintain the robustness as well as imperceptibility against piracy, malicious attacks, and various transformation operations. Though there are many challenges to achieve these results, there are two approaches presented for audio watermarking that are used to improve the robustness, and imperceptibility of the embedded information with security. To provide the security, DSSS Encryption and Decryption algorithm is used which is based on synchronized secret key concept along with DWT, DFT and SVD transformation methods. DWT (Discreet Wavelet Transformation) is used up to the fourth level to get the lowest frequency sub-band and after that DFT is applied to get the lowest frequency from the sub-band found by DWT in which the modifications are done, and then SVD (Singular Value Decomposition) is applied to it, so that the original audio file does not have any impact of the watermark bits to get the better robustness and imperceptibility.

First and foremost, praises and thanks to the God, the Almighty, for His showers of blessings throughout my research work to complete the research successfully.

I forward my sincere thanks to Prof. Saurabh A. Shah and Prof. Dipti B. Shah for their valuable help during the work of this book. Their suggestions were always there whenever I needed them. As a research supervisor, they spared their valuable time for the in-depth discussion on this research work. Also, I would forward my hearty thanks to the Department of Computer Science and Engineering and the department head Dr. Chirag D. Patel for providing us the computer laboratory access during our needs.

I am extremely grateful to my parents for their love, prayers, caring, and sacrifices for educating and preparing me for my future. Also, I express my thanks to my sister and brother for their support and valuable prayers.

Hearty thanks to department administrators of C U SHAH University, for their kind cooperation and providing us with necessary software whenever we asked for it.

Finally, I would like to thank all the people who were helpful to me, whether directly or indirectly for the completion of this research work.

Patel Krunalkumar N.