Abstract
We present an improved cryptographic system that utilizes optical vortex to implement double image encryption. Each of the grayscale images has been encrypted individually using DRPE. Phase mask incorporating optical vortexes (OV) and RPMs has been handed down in Fourier, space spectrum. Multiply the image to be encrypted by OV, and then perform direct and reverse LCT conversion on the resulting LCT to create the encrypted image. The resemblance can be recovered from the encrypted image by using the correct LCT and OV parameters. Digitalization has been performed using MATLAB (R2020a). In addition to the RPM, OV, and conversion sequence associated with LCT, are additional keys that cause difficulties for unauthorized users. The proposed scheme, therefore, is more secure than conventional technology. In addition, the RMSE between the restored image and the authentic image corroborates the efficacy of the strategy. Results of the numerical analysis demonstrate the effectiveness and safety of the system.