Asymmetric optical image encryption using Kolmogorov phase screens and equal modulus decomposition

Ravi Kumar; Basanta Bhaduri; Chenggen Quan

doi:10.1117/1.OE.56.11.113109

17 November 2017 Asymmetric optical image encryption using Kolmogorov phase screens and equal modulus decomposition

Ravi Kumar, Basanta Bhaduri, Chenggen Quan

Author Affiliations +

Optical Engineering, Vol. 56, Issue 11, 113109 (November 2017). https://doi.org/10.1117/1.OE.56.11.113109

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, Z1 and Z2. Among these, Z2 is reserved as a private key for decryption and Z1 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.

Citation Download Citation

Ravi Kumar, Basanta Bhaduri, and 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

Received: 16 September 2017; Accepted: 3 November 2017; Published: 17 November 2017

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