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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
A. Fatima and N. K. Nishchal 
Corresponding Authors:
N. K. Nishchal 
DOI #:
https://doi.org/10.1016/j.optcom.2018.02.030 
Title:
Optical image security using Stokes polarimetry of spatially variant polarized beam 
Journal:
Optics Communications 
Year:
2018 
Volume:
417 
Page:
30-36 
Keywords:
Optical security and encryption, Phase retrieval, Polarization, Fourier optics and signal processing 
Abstract:
We propose a novel security scheme that uses vector beam characterized by the spatially variant polarization distribution. A vector beam is so generated that its helical components carry tailored phases corresponding to the image/images that is/are to be encrypted. The tailoring of phase has been done by employing the modified Gerchberg–Saxton algorithm for phase retrieval. Stokes parameters for the final vector beam is evaluated and is used to construct the ciphertext and one of the keys. The advantage of the proposed scheme is that it generates real ciphertext and keys which are easier to transmit and store than complex quantities. Moreover, the known plaintext attack is not applicable to this system. As a proof-of-concept, simulation results have been presented for securing single and double gray-scale images. 
Entered by:
Venkata Dantham on 2020-08-03 
 
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