An asymmetric approach is utilized to encrypt an RGB image using double random phase encoding (DRPE) in the Fourier transform (FT). The RGB image input is primarily divided in three passages: “red, green, blue”. To obtain the complex intermediate image, each passage of an input image is transformed in a phase image with coupling amplitude masking before being Fourier transformed. The amplitude portion is then merged with a random phase mask (RPM), which acts as the first private key. FT is based on the amplitude of every “red, green, and blue” passage to provide the matching encrypted image, with the phase part serving as an additional secret key. The compiled encrypted image from all three images yields the final encrypted colored image. Decryption is the polar opposite of encryption. In the decryption phase, the security of the cryptosystem is examined. During the decryption, the security of the optical asymmetric cryptosystem is also examined. The suggested cryptosystem formed an optical asymmetric method applied to encrypt the RGB image.
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