Holographic display multi-image encryption method based on random light intensity modulation

The invention discloses a holographic display multi-image encryption method based on random light intensity modulation, and the method comprises the steps: S1, generating N normal Gaussian random distribution matrixes as a secret key 1, extracting M random modulation matrixes conforming to image features from the N normal Gaussian random distribution matrixes according to the features of a to-be-encrypted image, and carrying out the iteration of the M random modulation matrixes and M target images through a Gerchberg-Saxton (G-S) iteration algorithm, the method comprises the following steps of: compressing and encrypting a holographic encrypted image together, and taking a Fresnel diffraction distance selected according to image characteristics and crosstalk noise as much as possible as a key 2 to finish first encryption, n; s2, carrying out calculation correlation imaging encryption on the holographic encryption graph through a secret key 1; s3, receiving the ciphertext for multiple times through a bucket de