Digital image encryption transmission system

The invention relates to a digital image encryption transmission system. An encryption part comprises an image receiving template, a storage queue, an image compression module, an image encryption module, a monitoring module, a light beam forming micro-optical element and a diffraction grating module. The diffraction grating module comprises a movable beam and a fixed beam; the decryption module comprises a complex conjugate diffraction grating template, a COMS camera, an image decryption module and an image reconstruction module. The complex conjugate diffraction grating module also comprises a movable beam and a fixed beam, and is designed in a way that according to the voltage applied to the diffraction grating module, the movable beam generates displacement to cause phase transformation, and the transformed phase and the phase generated in the diffraction grating module are in a complex conjugate relationship, so that the scrambled image signal is decrypted. According to the system, encryption and scrambl