Eweoya, I., Daramola, O., & 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). Retrieved from https://journals.covenantuniversity.edu.ng/index.php/cjict/article/view/77