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Optical multi-image encryption based on frequency shift
Authors:Zhengjun Liu  Yan Zhang  Haifa Zhao  Shutian Liu
Institution:a Department of Physics, Harbin Institute of Technology, Harbin 150001, China
b Department of Physics, Capital Normal University, Xisanhuan Beilu 105 Beijing 100037, China
c Department of Automation Measurement and Control Engineering, Harbin Institute of Technology, Harbin 150001, China
d Department of Physics, COMSATS Institute of Information Technology, Lahore 54000, Pakistan
Abstract:We present a novel multi-image encryption and decryption algorithm based on Fourier transform and fractional Fourier transforms. Lower frequency parts of the original images are selected, frequency shifted and encrypted by using double phase encoding in fractional Fourier domains. Multiple images are encrypted together into a single one. A simple optical setup is given to implement the proposed algorithm. This scheme has features of enhancement in decryption accuracy and high optical efficiency. Numerical results have been given to verify the validity and efficiency of the proposed scheme.
Keywords:Image encryption  Cryptography  Optical transform
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