Abstract

Quick response (QR) code has been employed as a data carrier for optical cryptosystems in many recent research works, and the error-correction coding mechanism allows the decrypted result to be noise free. However, in this paper, we point out for the first time that the Reed-Solomon coding algorithm in QR code is not a very suitable option for the nonlocally distributed speckle noise in optical cryptosystems from an information coding perspective. The average channel capacity is proposed to measure the data storage capacity and noise-resistant capability of different encoding schemes. We design an alternative 2D barcode scheme based on Bose–Chaudhuri–Hocquenghem (BCH) coding, which demonstrates substantially better average channel capacity than QR code in numerical simulated optical cryptosystems.

© 2017 Optical Society of America

Optical encryption and QR codes: Secure and noise-free information retrieval

John Fredy Barrera, Alejandro Mira, and Roberto Torroba
Opt. Express 21(5) 5373-5378 (2013)

Four-dimensional key design in amplitude, phase, polarization and distance for optical encryption based on polarization digital holography and QR code

Chao Lin, Xueju Shen, and Baochen Li
Opt. Express 22(17) 20727-20739 (2014)

Experimental scrambling and noise reduction applied to the optical encryption of QR codes

John Fredy Barrera, Alejandro Vélez, and Roberto Torroba
Opt. Express 22(17) 20268-20277 (2014)

Optical asymmetric cryptosystem for multi-image in cyan–magenta–yellow–black color space

Yuxin Shen, Chen Tang, Lixiang Zhou, and Zhenkun Lei
Appl. Opt. 59(7) 1854-1863 (2020)

Lensless optical encryption with speckle-noise suppression and QR codes

P. A. Cheremkhin, N. N. Evtikhiev, V. V. Krasnov, V. G. Rodin, I. P. Ryabcev, A. V. Shifrina, and R. S. Starikov
Appl. Opt. 60(24) 7336-7345 (2021)