We introduce an information hiding-decoding system, which employs a passive diffractive processor as the front-end and an electronic decoder as the back-end, offering a fast, energy-efficient, and scalable solution for protecting visual information. This diffractive processor all-optically transforms arbitrary input messages into deceptive output patterns, decipherable only through a jointly-trained electronic decoder neural network. This method can successfully hide infinitely many input messages into ordinary-looking patterns at its output field-of-view, which can be subsequently decoded by an electronic network. We experimentally validated the feasibility of our information-hiding camera by 3D-printing a physical diffractive system and testing it under terahertz illumination.
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