Zafar, M. F., F. Naheed, Z. Ahmad, and M. M. Anwar. “NETWORK SECURITY: A SURVEY OF MODERN APPROACHES”. The Nucleus, vol. 45, no. 1-2, July 2020, pp. 11-31, http://www.thenucleuspak.org.pk/index.php/Nucleus/article/view/994.