An optical encryption of three-dimensional (3D) object with digital holography was implemented.\nIn the process of encryption, two holograms involved recording key information and 3D object\nwere obtained. In the process of decryption, the 3D object was reconstructed from the two holograms\nby extracting the object and key information, followed by multiplication of the two holograms\nand inverse Fresnel transform numerically. The robustness of the method was also tested\nfor different occlusions attacks and Gaussian noises. The results showed that the method was able\nto encrypt and decrypt the 3D object while being robust under different occlusions attacks and\nGaussian noises.
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