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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Acoustics

    Background:

    • Optical voice encryption previously utilized digital holography (DH) with double random phase encoding (DRPE) in the Fourier domain.
    • Existing methods offer a foundation but may have limitations in security scope.

    Purpose of the Study:

    • To propose and analyze optical voice encryption in extended domains beyond the Fourier transform.
    • To investigate the security implications and recording conditions for enhanced voice data protection.

    Main Methods:

    • Implementation of DRPE in fractional Fourier, Fresnel, and gyrator transforms for voice encryption.
    • Utilizing an off-axis DH optical setup to record time-series holograms of sound wave propagation.
    • Numerical reconstruction and decryption procedures to verify data retrieval.

    Main Results:

    • Successful encryption and decryption of experimentally recorded human voice in various optical domains.
    • Demonstration of enhanced security through the use of mixed space-frequency domains.
    • Analysis of recording parameters and security aspects relevant to optical voice encryption.

    Conclusions:

    • Extending optical voice encryption to new domains significantly enhances security.
    • The proposed methods provide a robust framework for secure voice communication.
    • Further analysis of recording conditions and security aspects is crucial for practical implementation.