1. Secure spread spectrum watermarking for multimedia
2. Spread spectrum watermarking: malicious attacks and counterattacks;Hartung F.;Electron. Imaging,1999
3. 2007 Proc. Int. Conf. on Computational Intelligence and Multimedia Applications Sivakasi Tamil Nadu India V. Senthil R. Bhaskaran Wavelet based digital image watermarking with robustness against geometric attacks 89 93
4. Digital image watermarking, its formal model, fundamental properties and possible attacks;Nyeem H.;EURASIP J. Adv. Signal Process.,2014