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Asymmetric multiple-image encryption system based on a chirp z-transform.

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    This study introduces an asymmetric multi-image encryption system using chirp z-transform (CZT) for secure data transmission. The hybrid optical setup efficiently encrypts and decrypts multiple images without cross-talk, enhancing data security.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Digital Image Processing

    Background:

    • Traditional encryption methods face challenges in securely transmitting multiple images simultaneously.
    • Existing optical encryption systems often lack asymmetry and dynamic data handling capabilities.
    • The chirp z-transform (CZT) offers potential for advanced signal processing and multiplexing.

    Purpose of the Study:

    • To develop and demonstrate an asymmetric multi-image encryption system.
    • To integrate a double-random-phase encryption scheme with CZT-based multiplexing.
    • To achieve secure, efficient, and crosstalk-free retrieval of multiple encrypted images.

    Main Methods:

    • A hybrid optical architecture combining a 4f configuration with double-random-phase encryption.
    • Implementation of a chirp z-transform (CZT) based multiplexing procedure for data encoding.
    • Design of a compact decryption stage for data retrieval.
    • Verification using virtual optical system simulations.

    Main Results:

    • Successful encodement and transmission of multiple images within a single multiplexed element.
    • Demonstration of a compact decryption stage with no cross-talk noise.
    • Validation of the system's asymmetric nature, enhancing resistance to cryptanalysis.
    • Expansion of static encoding setups to a dynamic range using CZT multiplexing.

    Conclusions:

    • The proposed asymmetric multi-image encryption system offers a versatile solution for handling large volumes of encrypted data securely and efficiently.
    • CZT-based multiplexing significantly enhances the functionality and dynamic range of optical encryption systems.
    • The system's asymmetric design provides robust security against cryptanalysis attacks.