Open AccessMultiple-image optical encryption based on phase retrieval algorithm and fractional Talbot effect
Author(s) -
Jingjing Wu,
Jicheng Wang,
Yanguang Nie,
Liang Hu
Publication year - 2019
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.27.035096
Subject(s) - talbot effect , ciphertext , algorithm , encryption , phase retrieval , computer science , optics , cryptosystem , multiplexing , mathematics , physics , cryptography , diffraction , telecommunications , fourier transform , mathematical analysis , operating system
A new multiple-image optical encryption scheme based on phase retrieval algorithm and fractional Talbot effect is proposed. In encryption process, by using Fresnel domain phase retrieval algorithm, each image is encoded into a pure phase distribution with different spatial constraints. The spatial constraints are chosen as complementary square aperture array. A Talbot illuminator is designed according to the fractional Talbot effect, which is treated as a decoder to obtain the designed square aperture array. Then all obtained phase distributions are combined into the final ciphertext image. In decryption process, the images can be decoded from the ciphertext by using the Talbot illuminator and keys. Benefit from the use of fractional Talbot effect, the demultiplexing setup of the cryptosystem is very simple and straightforward, with no need of lens. The simulation results prove that the multiplexing capability is considerably enhanced. At the same time, the security analysis proves that the system can resist various attacks.