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Lensless optical encryption with speckle-noise suppression and QR codes.

P A Cheremkhin, N N Evtikhiev, V V Krasnov

    Applied Optics
    |October 6, 2021
    PubMed
    Summary

    This study introduces a novel lensless optical encryption method using a special diffraction optical element (DOE) and spatially incoherent light. This technique overcomes speckle noise and enhances security for encrypted QR codes.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Digital Image Processing

    Background:

    • Contemporary optical encryption methods often use coherent light, leading to speckle noise that degrades performance.
    • Existing spatially incoherent encryption techniques face challenges with reduced encryption strength due to undiffracted light.
    • Information encoded in formats like QR codes is susceptible to these limitations.

    Purpose of the Study:

    • To develop a novel lensless optical encryption scheme that mitigates speckle noise and enhances encryption strength.
    • To address the limitations of existing coherent and incoherent optical encryption methods.
    • To demonstrate a secure and robust method for encrypting and decrypting information, such as QR codes.

    Main Methods:

    • A new lensless encryption scheme was designed and experimentally implemented.
    • Two liquid crystal spatial light modulators (SLMs) were utilized for encoding and encryption.
    • A specially designed encoding diffraction optical element (DOE) was employed with spherically diverging illumination, eliminating the need for a converging lens.

    Main Results:

    • The proposed scheme successfully encrypted QR codes using spatially incoherent light.
    • Experimental results demonstrated successful information retrieval from the decrypted images.
    • Analysis confirmed high key sensitivity and a large key space, indicating resistance to brute-force attacks.

    Conclusions:

    • The developed lensless optical encryption scheme effectively overcomes the drawbacks of traditional methods.
    • The technique offers a robust solution for secure optical encryption, particularly for data like QR codes.
    • The demonstrated security parameters suggest suitability for practical applications requiring high-level data protection.