Secret image sharing based on multiphase retrieval algorithm

This paper proposes a multiphase retrieval algorithm and then presents a secret image sharing scheme. The proposed algorithm can divide a secret image into multiple phase-only encodings (shadows) and then overcome the shadow expansion problem. When the shadows are arranged in a certain order, the light intensity detector can directly acquire the secret image using parallel light, and the recovery process is simple and easy to operate. Furthermore, Fresnel transform parameters are used for authentication, which can avoid deceit. The differences in the initial random phase encodings make the same secret image produce different shadows, which can effectively resist statistical analysis attacks. Finally, theoretical analysis and a simulation are used to verify the validity and feasibility of the proposed scheme.