Rao Kadham, Nithin, and Sreenivasa Ravi.K. “A Lightweight One Time Password (OTP) Based Smart Learning in Internet of Things”. International Journal of Engineering and Technology 7, no. 2.7 (March 18, 2018): 480–483. Accessed May 29, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/10867.