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Asymmetric double-image encryption via wavelength multiplexing.

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    This study introduces a new method for encrypting two images using wavelength multiplexing and equal modulus decomposition (EMD). This approach enhances security and allows for high-quality decryption of both images.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Image Processing

    Background:

    • Traditional image encryption methods face challenges in security and efficiency.
    • Equal Modulus Decomposition (EMD) offers advantages but can be vulnerable to attacks.
    • Wavelength multiplexing has not been previously utilized for dual-image encryption.

    Purpose of the Study:

    • To develop a novel asymmetric double-image encryption technique.
    • To enhance the security and robustness of image cryptosystems.
    • To achieve high-quality encryption and decryption of two images simultaneously.

    Main Methods:

    • A novel iterative phase retrieval algorithm is developed for encoding two images into a single complex-valued function using wavelength multiplexing.
    • The complex-valued function is then encoded using Equal Modulus Decomposition (EMD).
    • The cryptosystem is designed to reduce public keys, improving resistance to Amplitude-Phase Retrieval Algorithm (APRA) attacks.

    Main Results:

    • The proposed method successfully encrypts two images into one complex-valued function.
    • Decryption yields two high-quality images using their respective wavelengths.
    • The system demonstrates enhanced resistance to APRA attacks due to reduced public keys.

    Conclusions:

    • This is the first reported method to achieve high-quality two-image encryption and decryption using wavelength multiplexing.
    • The proposed asymmetric encryption technique is effective and robust, as confirmed by numerical simulations.
    • The integration of wavelength multiplexing and EMD offers a promising direction for secure image encryption.