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Optical Engineering

Choice of optical system is critical for the security of double random phase encryption systems
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Paper Abstract

The linear canonical transform (LCT) is used in modeling a coherent light-field propagation through first-order optical systems. Recently, a generic optical system, known as the quadratic phase encoding system (QPES), for encrypting a two-dimensional image has been reported. In such systems, two random phase keys and the individual LCT parameters ( α , β , γ ) serve as secret keys of the cryptosystem. It is important that such encryption systems also satisfy some dynamic security properties. We, therefore, examine such systems using two cryptographic evaluation methods, the avalanche effect and bit independence criterion, which indicate the degree of security of the cryptographic algorithms using QPES. We compared our simulation results with the conventional Fourier and the Fresnel transform-based double random phase encryption (DRPE) systems. The results show that the LCT-based DRPE has an excellent avalanche and bit independence characteristics compared to the conventional Fourier and Fresnel-based encryption systems.

Paper Details

Date Published: 14 June 2017
PDF: 7 pages
Opt. Eng. 56(6) 063103 doi: 10.1117/1.OE.56.6.063103
Published in: Optical Engineering Volume 56, Issue 6
Show Author Affiliations
Inbarasan Muniraj, Univ. College Dublin (Ireland)
Changliang Guo, Univ. College Dublin (Ireland)
Ra’ed Malallah, Univ. College Dublin (Ireland)
Univ. of Basrah (Iraq)
Derek Cassidy, Univ. College Dublin (Ireland)
Liang Zhao, Univ. College Dublin (Ireland)
James P. Ryle, Univ. College Dublin (Ireland)
John J. Healy, Univ. College Dublin (Ireland)
John T. Sheridan, Univ. College Dublin (Ireland)


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