Abstract
An asymmetric multi-image cryptosystem is proposed by using the cylindrical diffraction and the phase truncation, which can avoid the vulnerability of the linear cryptosystems, simultaneously encrypt multiple images and decrypt images individually. In the proposed cryptosystem, four original images are modulated by four different random phases, respectively, and then their results are combined into one image by using convolution. The combined image is encoded into a real-value ciphertext by phase truncation after cylindrical diffraction, while the phase parts are saved as asymmetric decryption keys. Due to applications of the asymmetric cylindrical diffraction and the nonlinear operation of phase truncation, the cryptosystem can resist numerous types of attacks. The two main features of the proposed cryptosystem are to encrypt multi-image without time increasing linearly and individually decrypt multi-image with highly flexible. The security and flexibility of the proposed cryptosystem are demonstrated by numerical simulation results.
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