Sayyad Liyakat, Kazi Kutubuddin. “Implementation of E-Mail Security With Three Layers of Authentication”. JOURNAL OF OPERATING SYSTEMS DEVELOPMENT & TRENDS 9, no. 2 (December 29, 2022): 29–35. Accessed May 5, 2024. https://stmcomputers.stmjournals.com/index.php/JoOSDT/article/view/400.