Visual Cryptography Technique Based on FFT. - Ali Makki Sagheer; Salah Sleibi Al-Rawi; Laith Hamid Abed (DeSE, 2011)

Visual Secret Sharing Without Pixel Expansion. - Ali Makki Sagheer; Laith Hamid Abed (Int. J. Digit. Crime Forensics, 2015)