The image encryption system based on optical orbital angular momentum holography and nonlinear authentication

Abstract This paper proposes an optical encryption system that integrates optical orbital angular momentum (OAM) holography with nonlinear authentication techniques. The scheme employs OAM beams with different topological charges to illuminate the segmented patterns, subsequently forming optical OAM multiplexed holograms. These multiplexed holograms are then decomposed into a series of matrices and combined with corresponding random matrix ciphertexts. Finally, the ciphertext serves as an illumination pattern to perform ghost imaging on the authentication images, yielding the authentication key. During decryption, the system requires pre-authentication, and only upon successful authentication can the decryption key be authorized for retrieval. This method effectively enhances the security of information transmission and demonstrates the system’s effectiveness through computer simulation experiments.