Mahmudah, Muhlisatul, Tri Novita Irawati, and Friska B. Nur Aini. “Polyalphabetic Cipher Cryptosystem Application in Making Anti-Hacker Passwords Learning Management Systems in Junior High Schools”. Alifmatika: Jurnal Pendidikan dan Pembelajaran Matematika 6, no. 1 (June 30, 2024): 90-103. Accessed July 16, 2024. https://journal.ibrahimy.ac.id/index.php/Alifmatika/article/view/4696.