Guide - P. Sripriya, T. Ezhil Sindhu,. “Secure Data Hiding in Multi-Level Using Digital Invisible Ink Based on Spread Spectrum Watermarking”. International Journal of Engineering and Computer Science 3, no. 08 (August 28, 2014). Accessed November 23, 2024. http://ijecs.in/index.php/ijecs/article/view/1266.