1 October 2004 Random phase and jigsaw encryption in the Fresnel domain
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Optical Engineering, 43(10), (2004). doi:10.1117/1.1790502
A number of methods have been recently proposed in the literature for the encryption of 2-D information using optical systems based on linear transforms, i.e., the Fourier (FT), the fractional Fourier (FRT), the Fresnel (FST), and the linear canonical transform (LCT). We propose and examine two encryption schemes using the Fresnel transform (FST) based on the use of random phase screens and random jigsaw transforms (JT). The strength and robustness of the level of encryption of the various techniques are examined with respect to blind decryption. These systems are compared with similar FRT- and LCT-based methods. Optical implementations are also discussed and sampling conditions are investigated in the context of the space-bandwidth product.
Bryan M. Hennelly, John T. Sheridan, "Random phase and jigsaw encryption in the Fresnel domain," Optical Engineering 43(10), (1 October 2004). http://dx.doi.org/10.1117/1.1790502

Image encryption

Transform theory

Spatial light modulators

Imaging systems


Fourier transforms

Direct methods

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