Abstract

We propose for the first time, to the best of our knowledge, the use of optimized random phases (ORAPs) in a double random phase encryption scheme (DRPE). In DRPE schemes the convolution between two random phase functions encrypts the information to be secured. However, in actual encryption applications, this convolution of random phases also results in unwanted effects like speckle noise. In this Letter we show that under certain conditions this noise can be drastically reduced. These conditions can be easily achieved by using ORAPs. These ORAPs, besides containing information about the parameters of the optical system and maintaining all the security properties of a random phase function, ensure that the encrypted data is a phase-only function. This leads to a great increase in system performance, with decryption quality similar to the reconstruction of a phase-only hologram generated with the Gerchberg–Saxton algorithm. We show both numerical and experimental results confirming the validity of our proposal.

© 2018 Optical Society of America

Optimized random phase only holograms

Alejandro Velez Zea, John Fredy Barrera Ramirez, and Roberto Torroba
Opt. Lett. 43(4) 731-734 (2018)

Experimental optical encryption of grayscale information

Alejandro Velez Zea, John Fredy Barrera, and Roberto Torroba
Appl. Opt. 56(21) 5883-5889 (2017)

Multi-depth three-dimensional image encryption based on the phase retrieval algorithm in the Fresnel and fractional Fourier transform domains

Mei-Lan Piao, Zi-Xiong Liu, Yan-Ling Piao, Hui-Ying Wu, Zhao Yu, and Nam Kim
Appl. Opt. 57(26) 7609-7617 (2018)

Information encryption in phase space

Jun Liu, Xiaobin Xu, Quanying Wu, John T. Sheridan, and Guohai Situ
Opt. Lett. 40(6) 859-862 (2015)

Holographic and speckle encryption using deep learning

Xiaogang Wang, Wenqi Wang, Haoyu Wei, Bijun Xu, and Chaoqing Dai
Opt. Lett. 46(23) 5794-5797 (2021)