Multi-image encryption method based on authentication phase and structured light illumination phase recovery

The invention discloses a multi-image encryption method based on authentication phase and structured light illumination phase recovery, which comprises an encryption step of encrypting each plaintext image into two pure phase masks by using a phase recovery algorithm under structured light illumination with the help of authentication phase, a final multi-image encryption ciphertext is generated by combining a phase mask multiplexing technology; in the decryption step, the decryption authentication phase can be used as a decryption phase key to decrypt the ciphertext only after passing authentication, and then a decryption image can be generated under the combined action of other decryption phase keys and the digital key. The decryption step can be completed by using a diffraction imaging device composed of a laser light source, a polarization modulator, a microscope objective, a pinhole, a collimating lens, a reflector, a phase modulator, a beam splitter prism and an image sensor. The method provided by the i