Obaid, P.D.T.A.S., Khami, A.P.D.M.J. and Shehab, D.L.G. (2018) “A classical approach for hiding encryption key in the same encrypted text document”, Journal of Kufa for Mathematics and Computer, 5(1), pp. 25–38. doi:10.31642/JoKMC/2018/050104.