Optical color image encryption based on an asymmetric cryptosystem in the Fresnel domain |
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| Authors: | Wen Chen Xudong Chen |
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| Affiliation: | 1. Intelligent Data Analytics Research Program Dept. Aselsan Research Center, Ankara, Turkey;2. Department of Electrical Engineering, Stanford University, CA, USA;3. Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey;4. National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey;1. Université de Lorraine, CNRS, CRAN, Nancy 54000, France;2. Université de Lorraine, Laboratoire Conception Optimisation et Modélisation des Systèmes, Metz 57070, France;3. Department of Automation Measurement and Control, Harbin Institute of Technology, Harbin 150001, China;4. Université de Toulouse, CNRS, LAAS, Toulouse 31400, France |
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| Abstract: | In recent years, optical color image encryption has attracted much attention in the information security field. Some approaches, such as digital holography, have been proposed to encrypt color images, but the previously proposed methods are developed based on optical symmetric cryptographic strategies. In this paper, we apply an optical asymmetric cryptosystem for the color image encryption instead of conventional symmetric cryptosystems. A phase-truncated strategy is applied in the Fresnel domain, and multiple-wavelength and indexed image methods are further employed. The security of optical asymmetric cryptosystem is also analyzed during the decryption. Numerical results are presented to demonstrate the feasibility and effectiveness of the proposed optical asymmetric cryptosystem for color image encryption. |
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