aldeen Abad Khalid R, Ala’a Hussain A. MULTI-LEVEL STEGANOGRAPHY SYSTEM USING WAVELET TRANSFORM. J. eng. sustain. dev. 2018;22(3):50-61. Accessed July 5, 2025. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/373