Acoustic encryption device and method based on cascade holographic technology

Abstract

The invention discloses an acoustic encryption device and method based on a cascade holographic technology, and relates to the technical field of information encryption. An acoustic encryption device based on a cascade holographic technology comprises a sound field generation module, a cascade acoustical holography encryption module and a cascade acoustical holography decryption module. The encryption method applied to the encryption device comprises the following steps of: bearing self verification information and phase distribution of a plurality of acoustic holograms of which encrypted information is physically separated by using a cascade acoustic hologram design method of a physical driving neural network; an acoustical hologram device encoding phase distribution of an acoustical hologram; the acoustical holographic devices are placed at corresponding physical space positions, incident sound waves are modulated by one or two acoustical holographic devices, different sound fields can be independently reconstructed to serve as verification information of each acoustical holographic device, and sound fields different from independent modulation can be cooperatively reconstructed to serve as encryption information. The method is large in information capacity and high in safety, and has unique application prospects in the fields of electromagnetic shielding, underwater communication and the like.

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