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Optical Engineering

Design and implementation of an optical joint transform encryption system using complex-encoded key mask
Author(s): Chiung-Liang Chen; Li-Chien Lin; Chau-Jern Cheng
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Paper Abstract

We investigate the practical design of a complex-encoded key mask for optical encryption and decryption based on joint transform correlation architecture. The mask is created by using two coupled liquid-crystal spatial light modulators, one operating in amplitude mode and the other in phase mode. We develop a modified iterative Fourier transformation algorithm to design an optimal complex key mask, which is applied and mapped to the complex modulation of the liquid-crystal devices for optical implementation. The limitations of the devices on the system design are investigated and analyzed. The width constraints of the key mask are also derived, based on the joint transform correlation architecture for optical realization. Experimental results show the decryption performance and the shift-invariance of the complex key mask.

Paper Details

Date Published: 1 June 2008
PDF: 8 pages
Opt. Eng. 47(6) 068201 doi: 10.1117/1.2943269
Published in: Optical Engineering Volume 47, Issue 6
Show Author Affiliations
Chiung-Liang Chen, Feng Chia Univ. (Taiwan)
Li-Chien Lin, Feng Chia Univ. (Taiwan)
Chau-Jern Cheng, National Taiwan Normal Univ. (Taiwan)


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