High-security learning-based optical encryption assisted by disordered metasurface

Zhipeng Yu, Huanhao Li, Wannian Zhao, Po-Sheng Huang, Yu-Tsung Lin, Jing Yao, Wenzhao Li, Qi Zhao, Pin Chieh Wu, Bo Li, Patrice Genevet (), Qinghua Song () and Puxiang Lai ()
Additional contact information
Zhipeng Yu: Hong Kong Polytechnic University
Huanhao Li: Hong Kong Polytechnic University
Wannian Zhao: Tsinghua University
Po-Sheng Huang: National Cheng Kung University
Yu-Tsung Lin: National Cheng Kung University
Jing Yao: Hong Kong Polytechnic University
Wenzhao Li: Hong Kong Polytechnic University
Qi Zhao: Hong Kong Polytechnic University
Pin Chieh Wu: National Cheng Kung University
Bo Li: Tsinghua University
Patrice Genevet: Colorado School of Mines
Qinghua Song: Tsinghua University
Puxiang Lai: Hong Kong Polytechnic University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Artificial intelligence has gained significant attention for exploiting optical scattering for optical encryption. Conventional scattering media are inevitably influenced by instability or perturbations, and hence unsuitable for long-term scenarios. Additionally, the plaintext can be easily compromised due to the single channel within the medium and one-to-one mapping between input and output. To mitigate these issues, a stable spin-multiplexing disordered metasurface (DM) with numerous polarized transmission channels serves as the scattering medium, and a double-secure procedure with superposition of plaintext and security key achieves two-to-one mapping between input and output. In attack analysis, when the ciphertext, security key, and incident polarization are all correct, the plaintext can be decrypted. This system demonstrates excellent decryption efficiency over extended periods in noisy environments. The DM, functioning as an ultra-stable and active speckle generator, coupled with the double-secure approach, creates a highly secure speckle-based cryptosystem with immense potentials for practical applications.

Date: 2024
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DOI: 10.1038/s41467-024-46946-w

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