Jackulin.C, R.Shalini, K.Kiruthika, D.Jennifer K.Sangeetha. “A Secure Pin Authentication Method Against Shoulder Surfing Attacks”. International Journal of Engineering and Computer Science 5, no. 10 (January 3, 2018). Accessed November 22, 2024. http://ijecs.in/index.php/ijecs/article/view/2730.