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Proceedings Paper

Encrypted Fourier holographic data storage with variable data reference wave for optical information security
Author(s): M. K. Sheeja; P. T. Ajith Kumar; Achuthsankar S. Nair
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Paper Abstract

In this work two liquid crystal spatial light modulators (LCSLMs) were applied to encode a reference beam and holographic storage of a set of encrypted data pages that formed the object beam. The SLMs were developed by converting two 84×48 pixels mobile phone displays and were set in transmissive mode. Fourier holograms were recorded in a red sensitive photopolymer emulsion (SM635C of POLYGRAMA, Brazil), coated on a glass substrate. While replay the reconstructed data page, recorded against a specific reference beam was captured by using a CCD camera and processed in a personal computer for decryption. The encoded reference beam forms a unique key to the individual hologram recorded through shift multiplexing. Diffraction efficiency of holograms was calculated and was found to be about 45%. The system offers a very cost effective solution for secure data storage and retrieval and can be used for storing valuable software, security documents etc.

Paper Details

Date Published: 9 January 2008
PDF: 4 pages
Proc. SPIE 6832, Holography and Diffractive Optics III, 68321C (9 January 2008);
Show Author Affiliations
M. K. Sheeja, Ctr. for Development of Imaging Technology (India)
P. T. Ajith Kumar, Ctr. for Development of Imaging Technology (India)
Achuthsankar S. Nair, Univ. of Kerala (India)

Published in SPIE Proceedings Vol. 6832:
Holography and Diffractive Optics III
Yunlong Sheng; Dahsiung Hsu; Chongxiu Yu, Editor(s)

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