Securing color information using Arnold transform in gyrator transform domain

In this paper, we propose a new method for securing color information based on Arnold transform in gyrator transform domain. A color image is first separated into red, green and blue component images, and each of these component images is then independently encrypted into first random phase mask placed at input image plane, and employed first Arnold transform and gyrator transform. The second random phase mask is placed at gyrator transform plane, and employed second Arnold transform and gyrator transform. The system parameters of Arnold transform and gyrator transform in each channel serve as additional keys in color image encryption and decryption, and hence enhances the security of the system. Numerical simulations are presented to confirm the security, validity and possibility of the proposed idea.

► Manuscript proposes a novel color image encryption/decryption method based on Arnold transform in gyrator transform domain.
► Periods of transform & iterative nos. of ART, rotation angles of GT in channel are main encryption keys & enlarge key space.
► The optical implementation of color image encryption technique has also been proposed.
► Numerical simulations are performed to confirm proposed algorithm.
► The performance, security and robustness have been analyzed to demonstrate the feasibility of proposed scheme.