17 November 2017 Asymmetric optical image encryption using Kolmogorov phase screens and equal modulus decomposition
Author Affiliations +
Abstract
An asymmetric technique for optical image encryption is proposed using Kolmogorov phase screens (KPSs) and equal modulus decomposition (EMD). The KPSs are generated using the power spectral density of Kolmogorov turbulence. The input image is first randomized and then Fresnel propagated with distance d . Further, the output in the Fresnel domain is modulated with a random phase mask, and the gyrator transform (GT) of the modulated image is obtained with an angle α . The EMD is operated on the GT spectrum to get the complex images, Z 1 and Z 2 . Among these, Z 2 is reserved as a private key for decryption and Z 1 is propagated through a medium consisting of four KPSs, located at specified distances, to get the final encrypted image. The proposed technique provides a large set of security keys and is robust against various potential attacks. Numerical simulation results validate the effectiveness and security of the proposed technique.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Ravi Kumar, Ravi Kumar, Basanta Bhaduri, Basanta Bhaduri, Chenggen Quan, Chenggen Quan, } "Asymmetric optical image encryption using Kolmogorov phase screens and equal modulus decomposition," Optical Engineering 56(11), 113109 (17 November 2017). https://doi.org/10.1117/1.OE.56.11.113109 . Submission: Received: 16 September 2017; Accepted: 3 November 2017
Received: 16 September 2017; Accepted: 3 November 2017; Published: 17 November 2017
JOURNAL ARTICLE
9 PAGES


SHARE
Back to Top