A Master thesis titled  (Optical Security Using Double Random Phase Encryption Based on Linear Canonical Transform with Sparse Representation Technique) was defended at College of Science, Department of Physics on )April 30, 2023), for the postgraduate Candidate  (Israa Mohammed Qasim). The aim of the thesis is to propose a novel method for optical image encryption and authentication to overcome the weakness of the existing cryptosystems.A Master thesis titled  (Optical Security Using Double Random Phase Encryption Based on Linear Canonical Transform with Sparse Representation Technique) was defended at College of Science, Department of Physics on )April 30, 2023), for the postgraduate Candidate  (Israa Mohammed Qasim). The aim of the thesis is to propose a novel method for optical image encryption and authentication to overcome the weakness of the existing cryptosystems.