Asymmetric Optical Cryptosystem in the Fractional Fourier Domain Using Photon Counting Imaging

Abstract

By extending the space of the keys, the double random phase encryption approach based on the Fractional Fourier domain improves optical security systems. A novel method for optical security is proposed in this paper. The method is based on combining photon counting (PC) imaging with double random phase encryption (DRPE) in the Fractional Fourier (FrFT) domain. Photon counting is used to generate sparse data from the encrypted amplitude function. Not only does integration improve the security system's resistance to intruder attacks, but it also minimizes information data for better meeting storage and transmission needs. The optical Asymmetric cryptosystem has been offered since the proposed method's encryption step differs from the decryption stage due to the use of photon counting imaging. Only the encrypted image's sparse data will be maintained during the decryption procedure. Wherever the generated image is unrecognizable and is not a replica of the original image As a result, to validate the sparse information, a non-linear optical correlation approach is demonstrated. The discrimination ratio measure is evaluated for different values of the number of photons (Np) and the nonlinear parameter to test the system's verification procedure (k). The simulation results show that the proposed solution is effective and practicable, and that it can increase the level of protection for optical security systems.