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    This study introduces a new asymmetric double-image encryption method using chaotic random phase encoding (CRPE). This technique offers convenient key management and secure, robust image encryption through Fresnel transforms.

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    Area of Science:

    • Information Security
    • Applied Optics
    • Cryptography

    Background:

    • Digital image encryption is crucial for secure data transmission.
    • Traditional methods often face challenges with key management and security vulnerabilities.

    Purpose of the Study:

    • To propose an asymmetric double-image encryption scheme using chaotic random phase encoding (CRPE).
    • To enhance security and simplify key management in image encryption.

    Main Methods:

    • Two grayscale images are Fresnel transformed and combined.
    • Phase-amplitude truncation is used to separate components.
    • Chaotic random phase encoding (CRPE) encrypts the amplitude component in the Fresnel domain.

    Main Results:

    • The proposed scheme successfully encrypts two images into a noise-like pattern.
    • Key management is simplified using chaotic map parameters and Fresnel transform parameters.
    • Numerical simulations confirm the scheme's feasibility, security, and robustness.

    Conclusions:

    • The CRPE-based asymmetric encryption scheme provides a secure and efficient method for double-image encryption.
    • The integration of chaotic maps and Fresnel transforms offers a novel approach to key management and encryption.