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    This study introduces a secure phase image encryption method using structured phase masks and gyrator transform. The technique enhances security and robustness against attacks, enabling effective optical implementation.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Image Processing

    Background:

    • Phase image encryption is crucial for secure data transmission.
    • Existing methods face challenges in security and optical implementation.
    • Gyrator Transform (GT) offers a promising domain for optical encryption.

    Purpose of the Study:

    • To propose a novel fully phase image encryption method.
    • To enhance security using structured phase masks (SPMs) based on devil's vortex Fresnel lenses (DVFLs).
    • To demonstrate optical implementation feasibility and robustness.

    Main Methods:

    • Double random-structured phase mask encoding in the gyrator transform domain.
    • Utilizing DVFL-based SPMs to increase key space and overcome axis alignment issues.
    • Image recovery using correct encryption parameters and conjugate random phase masks.

    Main Results:

    • The proposed scheme achieves high security through increased key space.
    • Successful image recovery demonstrated with low mean squared error.
    • The method shows robustness against occlusion and Gaussian noise attacks.

    Conclusions:

    • The DVFL-based SPM encryption in GT domain is a secure and effective method for fully phase images.
    • The scheme is suitable for optical implementation and resilient to common attacks.
    • This approach offers enhanced security and practical advantages for optical information security.