ABSTRACT

The attack is performed on Code Division Multiple Access (CDMA) spread spectrum watermarking scheme; Least Significant Bit (LSB) substitution algorithm and Singular Value Decomposition based watermarking algorithm. The watermarking techniques can be classified into: spatial and transform domain schemes. The watermarked image is called as cover image. The primary requirement of any digital watermarking schemes is robustness to the signal processing and intentional attacks. Digital Watermarking is an excellent tool at the disposal of the owners of the digital content to protect their Intellectual Property Rights. The attack performed on different watermarking schemes takes the advantage of the fact that there are no standardized watermarking algorithms with legal authorities and registered watermarks. The correlation values obtained are 0.971, 0.975, 0.977 for LSB substitution, CDMA spread spectrum and SVD watermarking respectively. The attack was also successfully implemented in spatial domain with correlation values 0.939, 0.971, 0.941.