Jassim, J. and Muhsen, H.J. (2017) “One Algorithm to Cipher Messages in Columnar and Fixed Period-d Transposition Cipher”, Ibn AL-Haitham Journal For Pure and Applied Sciences, 22(2). Available at: https://jih.uobaghdad.edu.iq/index.php/j/article/view/1231 (Accessed: 14 March 2025).