Chinonso, O., O. Omoruyi, K. Okokpujie, and S. John. “Development of an Encrypting System for an Image Viewer Based on Hill Cipher Algorithm”. COVENANT JOURNAL OF ENGINEERING TECHNOLOGY, vol. 1, no. 2, Dec. 2017, https://journals.covenantuniversity.edu.ng/index.php/cjet/article/view/707.