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Simulation study demonstrates multiple-image encryption into a single ciphertext using spiral phase mask rotations, indicating robust resistance against occlusion and differential attacks.
A method of multiple-image encryption via spiral phase mask rotations based on the joint transform correlator encryption system was proposed. Multiple images can be encrypted into one ciphertext through this approach. When decrypted the ciphertext, we have no need to produce too many key masks, only need rotate the key mask to the angle corresponding to the plaintext. The system also has good resistance to occlusion attack and differential attack. Computer simulations initially verified the correctness of this method, and the experimental results also confirmed its validity further.
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Chen et al. (2018) studied this question.
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