1. Visual cryptography;Naor,1994
2. Halftone visual cryptography for color images;Pahuja,2017
3. An asymmetric watermarking scheme based on visual cryptography;Hou,2000
4. A digital image copyright protection scheme based on visual cryptography;Hwang;Tamkang J Sci Eng,2000
5. Hassan Mahmoud A, Khalili Mohammed A. Self watermarking based on visual cryptography. In: Proceedings of world academy of science, engineering and technology, vol. 8; 2005. p. 159–62.