Sharma, P., P. Bhatpahri, R. K. . Patnaik, and R. Shrivastava. “Visual Encryption Using Multilevel Scrambling Followed by Affine Encryption Technique”. Asian Journal of Computer Science and Technology, vol. 7, no. 1, Feb. 2018, pp. 40-45, doi:10.51983/ajcst-2018.7.1.1832.