OICC Press Journal of Theoretical and Applied Physics 2251-7235 19 1 2025 02 10 Secure optical image encryption and authentication based on phase information and Collins diffraction transform 1 10 10.57647/j.jtap.2025.1901.08 EN ISRAA MOHAMMED QASIM General Directorate of Education in Basrah, Ministry of Education, Iraq https://orcid.org/0000-0003-3580-7608 EMAD ABDULZAHRA MOHAMMED Department of Physics, College of Science, University of Basrah, Iraq https://orcid.org/0000-0003-3552-2549 Journal Article 2025 02 10 In this work, an optical asymmetric scheme for image encryption and authentication is proposed. Our proposal uses an information authentication process for phase encrypted data in the Collins diffraction domain. A partial phase component of the optical image encrypted is used in the decryption stage to validate the grayscale encrypted data. Meanwhile, the use of phase component will be facilitating the design and implementation of optical encryption schemes. The limited phase data makes the scheme more secure owing to difficult reorganization of the confidential information. In addition to security increases, a reduction of encrypted data is achieved by selecting some parts of the phase component of the encrypted data for the decryption process. Therefore, this development strategy efficiently facilitates optical information transfer and storage. Numerical simulations verify the resistance of the system against noise, cropping attacks, and potential attacks.