1. Visual cryptography;Naor,1995
2. Encryption of pictures and shapes by Random Grids;Kafri;Optics, Letters,1987
3. Hybridization of DCT based Steganography and Random Grids”;Sandeep;International Journal of Network Security & Its Applications,2013
4. Recursive Hiding Of Secrets In Visual Cryptography”;Meenakshi,2002
5. Multiple-image encryption by rotating random grids”;Chen,2008