Sudiarto Raharjo, Willy, Ignatia Dhian E.K. Ratri, and Henry Susilo. “IMPLEMENTASI TWO FACTOR AUTHENTICATION DAN PROTOKOL ZERO KNOWLEDGE PROOF PADA SISTEM LOGIN”. Jurnal Teknik Informatika dan Sistem Informasi 3, no. 1 (April 8, 2017). Accessed May 1, 2024. https://journal.maranatha.edu/index.php/jutisi/article/view/659.