Abstract
In this paper, we propose an optical asymmetric single-channel cryptosystem based on QZ synthesis (QZS) for color images. In our cryptosystem, a QZS method for synthesizing color image into the grayscale image is proposed for the first time, thus realizing single-channel encryption. Then the synthesized image is modulated with the random phase masks, and transformed in the Gyrator domain to obtain the cipher image. With the QZS, our cryptosystem can achieve asymmetric and single-channel encryption. Compared with the existing phase truncated-based cryptosystems, our cryptosystem can improve security against the special attack. Numerical simulation results demonstrate the feasibility and robustness of our cryptosystem for encrypting one or even multiple color images.
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