Secured Personal Notes Application using PlayFair Cipher 8 x 8 Matrix. International Journal of Computer and Information Technology(2279-0764), [S. l.], v. 13, n. 1, 2024. DOI: 10.24203/37nevj90. Disponível em: https://ijcit.com/index.php/ijcit/article/view/248. Acesso em: 25 jun. 2025.