Multi-image holographic encryption based on phase recovery algorithm and ghost imaging

There is a method that presents for securing much information at the same time, which need not be restricted to a single image data. Based on ghost imaging, this paper proposes a new encryption algorithm: multi-image holographic encryption based on phase recovery algorithm and ghost imaging (PRA-GI). In the encryption process, first, multiple images are combined into one phase hologram image by phase holographic recovery algorithm. Second, the combined image is encrypted by ghost imaging to obtain ciphertext. During the decryption, each receiver can get the same phase hologram image reconstructed by the public key. Finally, each receiver uses the unique assisted private key to get corresponding information. By numerical simulation, it is found that this algorithm can effectively improve the encryption capacity. Experimental results and objective indicators verify the feasibility of this algorithm. At the same time, PRA-GI is suitable for enterprises and governments. For example, the leader license different assisted private keys and the primary public key to different employees according to different permissions. This algorithm implements double encryption, which ensures the security of information and solves crosstalk problems among images.