A. S. Abukeshipa and T. S. Barhoom, “Implementation and Comparison of OTP Techniques (TOTP, HOTP, CROTP) to Prevent Replay Attack in RADIUS Protocol”, م.ك.ف.ت.ا.د, vol. 1, no. 1, pp. 1–15, Dec. 2014, doi: 10.47641/JRS.2014-1-1.09.