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    Area of Science:

    • Optics
    • Digital Systems
    • Cryptography

    Background:

    • Traditional optical cryptosystems often require complex setups.
    • Existing methods may involve reference beams or phase-shifting techniques, increasing system complexity.

    Purpose of the Study:

    • To propose a simplified opto-digital cryptosystem.
    • To develop a system using joint transform correlator architecture without a reference beam or phase-shifting.

    Main Methods:

    • Utilizing a joint transform correlator architecture.
    • Employing only two intensity recordings: key Fourier transform and joint power spectrum.
    • Implementing a modified Gerchberg-Saxton algorithm for phase recovery.

    Main Results:

    • Successful demonstration of an opto-digital cryptosystem.
    • Encryption key phase recovered using modified Gerchberg-Saxton algorithm.
    • Validation through computer simulations and experimental results.

    Conclusions:

    • The proposed system offers a simplified and effective approach to optical data encryption.
    • The method eliminates the need for a reference beam and phase-shifting, reducing hardware requirements.
    • The system's feasibility is confirmed by both simulation and experimental validation.