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During recent decades, double random phase encoding grasped more attention for researchers. To achieve nonlinearity, it had been done with random S-Box. We exhibit this involvement that DRPE system is much vulnerable in the above methodology. Concatenating anything with DRPE needs an imaginary value, wherein s-box unsuccessful in it. Used S-box has been reformed into various sizes. Due to this scenario, S-box values are replicating. So, complex S-box has been employed and proposed size of the s-box is similar to an input image. Numerical simulations have been performed out to validate the practicability and trustworthiness of traditional DRPE system with complex S-box.