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[Editors Pick] Current Optics and Photonics Vol. 5 no. 2 (2021 April)

사무국 hit 411 date 2021-04-30

Optical Encryption Scheme for Cipher Feedback Block Mode Using Two-step Phase-shifting Interferometry

Seok Hee Jeon 1 and Sang Keun Gil 2 *

1 Department of Electronic Engineering, Incheon National University, Incheon 22012, Korea
2 Department of Electronic Engineering, The University of Suwon, Hwaseong, Suwon 18323, Korea

 

Current Optics and Photonics Vol. 5 no. 2, pp. 155-163

DOI: https://doi.org/10.3807/COPP.2021.5.2.155

 

 

Abstract

We propose a novel optical encryption scheme for cipher-feedback-block (CFB) mode, capable of encrypting two-dimensional (2D) page data with the use of two-step phase-shifting digital interferometry utilizing orthogonal polarization, in which the CFB algorithm is modified into an optical method to enhance security. The encryption is performed in the Fourier domain to record interferograms on charge-coupled devices (CCD)s with 256 quantized gray levels. A page of plaintext is encrypted into digital interferograms of ciphertexts, which are transmitted over a digital information network and then can be decrypted by digital computation according to the given CFB algorithm. The encryption key used in the decryption procedure and the plaintext are reconstructed by dual phase-shifting interferometry, providing high security in the cryptosystem. Also, each plaintext is sequentially encrypted using different encryption keys. The random-phase mask attached to the plaintext provides resistance against possible attacks. The feasibility and reliability of the proposed CFB method are verified and analyzed with numerical simulations.