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Optical Engineering

Random phase and jigsaw encryption in the Fresnel domain
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Paper Abstract

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.

Paper Details

Date Published: 1 October 2004
PDF: 11 pages
Opt. Eng. 43(10) doi: 10.1117/1.1790502
Published in: Optical Engineering Volume 43, Issue 10
Show Author Affiliations
Bryan M. Hennelly, National Univ. Of Ireland/Dublin (Ireland)
John T. Sheridan, National Univ. of Ireland/Dublin (Ireland)


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