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Integrating Fresnel diffraction, multi-phase retrieval, and hyperchaos mapping for color image encryption.

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    This study introduces a novel color image encryption technique using Fresnel diffraction and hyperchaotic mapping. The method ensures secure, high-fidelity image decryption and offers robust protection against various attacks.

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    Area of Science:

    • Cryptography
    • Image Processing
    • Applied Physics

    Background:

    • Digital image security is crucial.
    • Existing encryption methods face challenges in complexity and security.
    • Need for robust and efficient color image encryption.

    Purpose of the Study:

    • To propose a novel two-stage color image encryption method.
    • To enhance security using Fresnel diffraction, multi-phase retrieval, and hyperchaotic mapping.
    • To achieve high fidelity in decrypted images and resistance to attacks.

    Main Methods:

    • Color image converted to amplitude-type computer-generated hologram (CGH).
    • Gerchberg-Saxton (GS) algorithm used for multi-phase retrieval and encryption.
    • Lorenz hyperchaotic system generates sequences for scrambling/diffusion.

    Main Results:

    • Decrypted color images show high consistency with original plaintext images.
    • The encryption key space is approximately 10^301, offering vast security.
    • The method demonstrates statistical independence of ciphertext pixels.

    Conclusions:

    • The proposed method provides a secure and effective approach for color image encryption.
    • It exhibits strong resistance against chosen-plaintext and chosen-ciphertext attacks.
    • The technique offers a large key space and high-quality decryption.