Nihayah, Ulin, Any Muanalifah, and Aini Fitriyah. “Algorithm Hill Cipher for Securing Arabic Text Documents”. Journal of Natural Sciences and Mathematics Research 3, no. 2 (December 31, 2017): 247–251. Accessed June 7, 2025. https://journal.walisongo.ac.id/index.php/JNSMR/article/view/10950.