AZIZAH, L. N. . How Can Playfair Cipher Secure Data?. Proceeding International Conference on Science and Engineering, [S. l.], v. 3, p. 273–277, 2020. DOI: 10.14421/icse.v3.512. Disponível em: https://www.sunankalijaga.org/prosiding/index.php/icse/article/view/512. Acesso em: 30 jul. 2026.