Pratama, Rianda. “A Strategy to Securing Network Access With L2TP over IP Security Pre-Shared Key And Port Knocking”. JUPITER: Jurnal Penelitian Ilmu dan Teknologi Komputer 14, no. 2-b (February 16, 2023): 306–316. Accessed November 13, 2024. https://jurnal.polsri.ac.id/index.php/jupiter/article/view/5096.