Open AccessNovel asymmetric cryptosystem based on distorted wavefront beam illumination and double-random phase encoding
Author(s) -
Honghao Yu,
Jun Chang,
Xin Liu,
Chan-Shuo Wu,
Yifan He,
Yongjian Zhang
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.008860
Subject(s) - wavefront , optics , cryptosystem , zemax , zernike polynomials , computer science , deformable mirror , adaptive optics , distortion (music) , physics , wavefront sensor , phase retrieval , fourier transform , cryptography , algorithm , telecommunications , software , amplifier , bandwidth (computing) , quantum mechanics , programming language
Herein, we propose a new security enhancing method that employs wavefront aberrations as optical keys to improve the resistance capabilities of conventional double-random phase encoding (DRPE) optical cryptosystems. This study has two main innovations. First, we exploit a special beam-expander afocal-reflecting to produce different types of aberrations, and the wavefront distortion can be altered by changing the shape of the afocal-reflecting system using a deformable mirror. Then, we reconstruct the wavefront aberrations via the surface fitting of Zernike polynomials and use the reconstructed aberrations as novel asymmetric vector keys. The ideal wavefront and the distorted wavefront obtained by wavefront sensing can be regarded as a pair of private and public keys. The wavelength and focal length of the Fourier lens can be used as additional keys to increase the number of degrees of freedom. This novel cryptosystem can enhance the resistance to various attacks aimed at DRPE systems. Finally, we conduct ZEMAX and MATLAB simulations to demonstrate the superiority of this method.