ADHISASTRA, I Ketut Prawira et al. Implementasi Port Knocking Dalam Mengamankan Jaringan VPN Pada Sistem E-learning. JELIKU (Jurnal Elektronik Ilmu Komputer Udayana), [S.l.], v. 11, n. 1, p. 55-62, july 2022. ISSN 2654-5101. Available at: <https://ojs.unud.ac.id/index.php/jlk/article/view/86883>. Date accessed: 28 apr. 2024. doi: https://doi.org/10.24843/JLK.2022.v11.i01.p06.