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a1 shows the optical setup of the double-random phase encoding encryption system where Fc x yT and Qc x yT denote the input image and the encrypted image respectively． P 1 0 x yT and P 2 0 x yT are the phase-only masks with phases randomly distributed in a range of 0 2π and f is the focal length of the Fourier transform lenses． The encrypted image can be expressed ass Qc x yT = FT FT Fc x yT × P 1 0 x yT × P 2 0 x yT c 11
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Optical techniques have shown great potential in information security.This paper reviews the most recent technological and application advances of optical encryption of 2-D and 3-D objects.The main optical encryption techniques and encryption algorithms are summarized and illustrated in detail.Challenges and developments,which are the subject of th...
