19 March 2003 Image encryption and the fractional Fourier transform
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A number of methods have been recently proposed in the literature for the encryption of 2-D information using optical systems based on the Fractional Fourier Transform. In this paper a brief review of the methods proposed to date is presented. A new technique based on a random shifting algorithm is proposed. The new method is compared numerically to the existing methods. A measure of the strength/robustness of the level of encryption of the various techniques is proposed and a comparison is carried out between the methods. Optical implementations are discussed as are robustness of the systems with respect to misalignment and random noise.
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Bryan M. Hennelly, Bryan M. Hennelly, John T. Sheridan, John T. Sheridan, } "Image encryption and the fractional Fourier transform", Proc. SPIE 4877, Opto-Ireland 2002: Optical Metrology, Imaging, and Machine Vision, (19 March 2003); doi: 10.1117/12.463691; https://doi.org/10.1117/12.463691

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