SAFAA YOUNUS ALSAFFAWI, ZEYAD. “Image Steganography by Using Exploiting Modification Direction and Knight Tour Algorithm”. Journal of Al-Qadisiyah for Computer Science and Mathematics, vol. 8, no. 1, Aug. 2017, pp. 1-11, https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/57.