Hafiz Nanda Ginting, Subhan, Muhammad Rhifky Wayahdi, and Surya Guntur. “Playfair Cipher Algorithm in Learning Media”. Jurnal Minfo Polgan 11, no. 1 (March 5, 2022): 9-14. Accessed August 14, 2024. https://jurnal.polgan.ac.id/index.php/jmp/article/view/11560.