Eweoya, I., Daramola, O. and Omoregbe, N. (2013) “Improving Security Using Refined 16 X 16 Playfair Cipher for Enhanced Advanced Encryption Standard (AES)”, Covenant Journal of Informatics and Communication Technology, 2(1). Available at: https://journals.covenantuniversity.edu.ng/index.php/cjict/article/view/77 (Accessed: 3 May 2024).