Visual Cryptography Using Binary Amplitude-Only Holograms

Visual cryptography (VC) is developed to be a promising approach encoding secret information using pixel expansion rules. The useful can directly rendered based on human vision without the usage of decryption algorithms. However, many VC schemes cannot withstand occlusion attacks. In this paper, new scheme proposed binary amplitude-only holograms (AOHs) generated by modified Gerchberg-Saxton algorithm (MGSA). During encryption, image divided into group unrecognizable and mutually-unrelated shares, then shares are further converted AOHs MGSA. extraction, logically superimposed form stacked hologram, extracted from hologram. Different conventional schemes, converts AOHs. Due redundancy AOHs, method numerically experimentally verified feasible effective, possesses high robustness against