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    This study presents a novel optical method for simultaneously encrypting and hiding images using a modified Mach-Zehnder interferometer. The technique embeds an encrypted object image within a host image, rendering it imperceptible to unauthorized viewers.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Image Processing

    Background:

    • Optical image encryption and hiding are crucial for secure data transmission.
    • Existing methods often require complex setups or computational processing.
    • A need exists for high-speed, purely optical solutions for combined encryption and hiding.

    Purpose of the Study:

    • To propose and validate a novel method for simultaneous optical image encryption and hiding.
    • To implement this method using a modified Mach-Zehnder interferometer in the Fresnel domain.
    • To demonstrate the imperceptibility of encrypted information and the method's robustness.

    Main Methods:

    • Encoding an original object image into an encrypted image.
    • Embedding the encrypted image into a host image using a modified Mach-Zehnder interferometer.
    • Utilizing interference patterns resembling Fresnel diffraction for hiding the encrypted data.

    Main Results:

    • Successful simultaneous optical image encryption and hiding achieved.
    • Encrypted images were rendered imperceptible within host images.
    • Numerical simulations and experiments confirmed the method's validity and robustness against attacks.

    Conclusions:

    • The proposed optical method offers a high-speed, secure solution for image encryption and hiding.
    • The modified Mach-Zehnder interferometer architecture effectively conceals information in the Fresnel domain.
    • This technique provides a robust and practical approach for optical information security.