Improved Techniques of Robust and Secure Watermarking for Digital Documents

Abstract

With the remarkable progress of information and communication technology (ICT), a lot of digital information is quickly and easily being created, distributed and transmitted over the public networks. However, security and privacy of digital data has been potential issue due to attempts of different attacks, when they are transmitted over the network. Digital watermarking is the most popular technique used to provide protection of digital data from unauthorized users. Present work focuses on security of digital documents to prove authenticity of transmitted documents. The entire research study has been organized in six chapters. newlineInitial contribution of chapter 1 start with overview of digital watermarking and review of various robust and secure state-of-the-arts approaches implemented for potential applications. In addition, potential characteristics of digital watermarking, important applications, spatial and transform domain techniques and major performance parameters are discussed. An improved wavelet-based image watermarking using SPIHT is presented in Chapter 2. Main focus of this chapter is to improve robustness and acceptable imperceptibility. Chapter 3 discusses multiple images watermarking using SPIHT in NSCT domain. Aim of this chapter is to achieve high capacity, improve robustness and imperceptibility at same time. Encryption based multiple watermarking in NSCT domain for securing digital documents in wavelet domain is developed in Chapter 4. Main focus of this chapter is to enhance security of digital documents. In Chapter 5, we presents the hybrid transforms and error correcting code based improved robust watermarking approach at low distortion. Finally, summary of the entire work along with findings and scope of further work is given in Chapter 6. newline newline