any tools could make optical encryptions without transforming the signal to electrical to encrypt it.
Check this article:
Optical cryptography with biometrics for multi-depth objects
By :Aimin Yan, Yang Wei,
Optical Encryption
https://www.crowncastle.com/infrastructure-solutions/optical-encryption
Optical Encryption Techniques: An Overview
By: M.A. Mohamed , A.S. Samarah , M.I. Fath Allah
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