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    This study introduces a dual image encryption-decryption method combining Fourier single-pixel imaging (FSI) and the Moiré effect. This novel approach enhances security for image transmission and storage.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Digital Imaging

    Background:

    • Fourier single-pixel imaging (FSI) offers capabilities beyond image transmission, including encryption and decryption.
    • Existing encryption methods using the Moiré effect or FSI individually have limitations.

    Purpose of the Study:

    • To propose and validate a dual image encryption-decryption strategy integrating FSI with the Moiré effect.
    • To enhance image security by layering encryption techniques.

    Main Methods:

    • An image is first encrypted using the Moiré effect as a watermark.
    • Phase-shifting coefficients of the watermark embed it into structured illumination for secondary encryption.
    • Fourier single-pixel imaging (FSI) performs initial decryption using the structured light.
    • Additive Moiré effect achieves final, secondary decryption.

    Main Results:

    • Numerical simulations and optical experiments confirm the feasibility of the proposed dual encryption-decryption strategy.
    • The combined approach successfully encrypts and decrypts images through two distinct stages.
    • The method demonstrates effectiveness in scenarios where single encryption methods are insufficient.

    Conclusions:

    • The proposed dual image encryption-decryption method leverages the synergistic advantages of FSI and Moiré effect.
    • This technique provides a robust solution for secure image handling, overcoming limitations of standalone methods.
    • The strategy presents a promising advancement in optical information security.