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Optical Engineering

Optical encryption using a localized fractional Fourier transform
Author(s): Naveen Kumar Nishchal; G. Unnikrishnan; Joby Joseph; Kehar Singh
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Paper Abstract

We propose a new method to encrypt and decrypt a two-dimensional amplitude image, which uses a jigsaw transform and a localized fractional Fourier transform. The jigsaw transform is applied to the original image to be encrypted, and the image is then divided into independent nonoverlapping segments. Each image segment is encrypted using different fractional parameters and two statistically independent random phase codes. The random phase codes, along with the set of fractional orders and jigsaw transform index, form the key to the encrypted data. Results of computer simulation are presented to verify the proposed idea and analyze the performance of the method. We also propose an optical implementation, which may find application for encrypting data stored in holographic memory.

Paper Details

Date Published: 1 December 2003
PDF: 6 pages
Opt. Eng. 42(12) doi: 10.1117/1.1624850
Published in: Optical Engineering Volume 42, Issue 12
Show Author Affiliations
Naveen Kumar Nishchal, Indian Institute of Technology/Delhi (India)
G. Unnikrishnan, Indian Institute of Technology Delhi (India)
Joby Joseph, Indian Institute of Technology (India)
Kehar Singh, Indian Institute of Technology (India)


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