title: Optical image encryption based on diffractive imaging.
abstract: In this Letter, we propose a method for optical image encryption based on diffractive imaging. An optical multiple random phase mask encoding system is applied, and one of the phase-only masks is selected and laterally translated along a preset direction during the encryption process. For image decryption, a phase retrieval algorithm is proposed to extract a high-quality plaintext. The feasibility and effectiveness of the proposed method are demonstrated by numerical results. The proposed method can provide a new strategy instead of conventional interference methods, and it may open up a new research perspective for optical image encryption.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576. elechenw@nus.edu.sg
authors.forename: Wen
authors.initials: W
authors.lastname: Chen
authors.forename: Xudong
authors.initials: X
authors.lastname: Chen
authors.forename: Colin J R
authors.initials: CJ
authors.lastname: Sheppard
mesh_terms: D000465:Algorithms; D016494:Computer Security; D005240:Feasibility Studies; D055095:Optics and Photonics / Q000295:instrumentation / Q000379:methods* / Q000592:standards