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    Area of Science:

    • Optics and Photonics
    • Cryptography
    • Information Security

    Background:

    • Optical cryptographic techniques are vital for secure data transmission.
    • Traditional Exclusive-OR (XOR) based optical image encryption suffers from quality degradation due to laser speckles and noise.
    • Existing methods often lack robustness and practicality for real-world implementation.

    Purpose of the Study:

    • To develop a robust and high-quality optical image encryption system.
    • To mitigate the issues of laser speckles and noise in optical XOR encryption.
    • To propose a cost-effective and practical solution for optical cryptography.

    Main Methods:

    • Implementation of an image encryption scheme using Exclusive-OR (XOR) operation.
    • Utilizing light-emitting diodes (LEDs) and quick response (QR) codes as key components.
    • Comparative analysis of encryption performance using green LEDs, white LEDs, and laser sources.

    Main Results:

    • The proposed LED and QR code-based XOR encryption significantly reduces image quality degradation caused by speckles and noise.
    • Demonstrated successful decryption with improved quality compared to traditional laser-based methods.
    • The system shows comparable or superior performance with LEDs versus laser sources in terms of noise and speckle reduction.

    Conclusions:

    • The novel optical cryptosystem offers a simple, compact, and cost-effective solution for secure image encryption.
    • LEDs provide a viable and advantageous alternative to lasers for optical XOR encryption, enhancing decryption quality.
    • The method addresses key limitations of existing optical cryptographic techniques, paving the way for practical applications.