Double color image encryption scheme based on off-axis holography and maximum length cellular automata

A double color image encryption scheme based on off-axis holography and maximum length cellular automata (MLCA) is proposed. The original image is separated into three channels: red, green, and blue, and each channel is independently encrypted by using MLCA mask to make the intensity values change in the spatial domain. Then the reference waves with different incident angles are introduced into the off-axis Fourier transform hologram to accomplish double color image encryption. The system parameters of the off-axis Fourier transform in each channel are also keys in image encryption and decryption. When we want to decrypt one of the original images, the reference wave with certain incident angle and corresponding MLCA mask are used. Some numerical simulations have demonstrated to show the effectiveness of the proposed scheme, and we present the results of our preliminary experiments.