Kumar, Ashutosh, and Maina Changeriwal. “Graphical Password Authentication Using PassPoint and PTC Scheme”. JOURNAL OF OPERATING SYSTEMS DEVELOPMENT & TRENDS 9, no. 3 (March 7, 2023): 1–7. Accessed April 16, 2026. https://stmcomputers.stmjournals.com/index.php/JoOSDT/article/view/438.