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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
R. Kumar, B. Bhaduri, and N. K. Nishchal 
Corresponding Authors:
N. K. Nishchal 
DOI #:
10.1088/2040-8986/aa9943 
Title:
Nonlinear QR code based optical image encryption using spiral phase transform, equal modulus decomposition and singular value decomposition 
Journal:
Journal of Optics  
Year:
2018 
Volume:
20 
Page:
015701 
Keywords:
optical image encryption, singular value decomposition 
Abstract:
In this study, we propose a quick response (QR) code based nonlinear optical image encryption technique using spiral phase transform (SPT), equal modulus decomposition (EMD) and singular value decomposition (SVD). First, the primary image is converted into a QR code and then multiplied with a spiral phase mask (SPM). Next, the product is spiral phase transformed with particular spiral phase function, and further, the EMD is performed on the output of SPT, which results into two complex images, Z 1 and Z 2. Among these, Z 1 is further Fresnel propagated with distance d, and Z 2 is reserved as a decryption key. Afterwards, SVD is performed on Fresnel propagated output to get three decomposed matrices i.e. one diagonal matrix and two unitary matrices. The two unitary matrices are modulated with two different SPMs and then, the inverse SVD is performed using the diagonal matrix and modulated unitary matrices to get the final encrypted image. Numerical simulation results confirm the validity and effectiveness of the proposed technique. The proposed technique is robust against noise attack, specific attack, and brutal force attack. Simulation results are presented in support of the proposed idea. 
Entered by:
Venkata Dantham on 2020-08-03 
 
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