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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
A. Kumar, A. Fatima, and N. K. Nishchal 
Corresponding Authors:
N. K. Nishchal 
DOI #:
https://doi.org/10.1016/j.optcom.2018.07.027 
Title:
An optical Hash function construction based on equal modulus decomposition for authentication verification 
Journal:
Optics Communications  
Year:
2018 
Volume:
428 
Page:
07-14 
Keywords:
Hash function, Image encryption, Fractional Fourier transform, Joint transform correlator 
Abstract:
This paper proposes a Hash based authentication scheme that employs equal modulus decomposition (EMD) and fractional joint transform correlator. An 8-bit grey scale image is separated into its constituent bit plane matrices. Each bit plane matrix is subjected to EMD encryption procedure employing numerically generated random phase mask (RPM) and amplitude mask (AM). The EMD encryption results into two complex functions, which are used for the generation of phase mask and amplitude mask for the next bit plane matrix. A two round EMD procedure is carried out to obtain an 8-bit intensity matrix which is Fourier transformed and its central frequency components are extracted to obtain a 256-bit Hash value. Numerical simulations have been carried out to validate the effectiveness and performance of the proposed scheme. 
Entered by:
Venkata Dantham on 2020-08-03 
 
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