HIDAYAT, M. M.; NUGROHO, W.; ARIYUS, D. Implementation Of Message Security In Pictures Using Playfair Chiper Algorithm: Implementation Of Message Security In Pictures Using Playfair Chiper Algorithm. Jurnal Mantik, [S. l.], v. 3, n. 4, p. 420-427, 2020. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/585. Acesso em: 13 jun. 2026.