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Enhanced secrecy in optical communication using speckle from multiple scattering layers.

Alfredo Rates, Joris Vrehen, Bert Mulder

    Optics Express
    |July 21, 2023
    PubMed
    Summary

    This study enhances optical communication security by using scattering layers to hide sender and receiver. Analysis confirmed no correlation between intermediate speckle patterns and the message, preventing man-in-the-middle attacks.

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    Area of Science:

    • Optics
    • Information Security
    • Optical Wireless Communication

    Background:

    • Optical communication systems face security challenges, particularly in preventing unauthorized interception.
    • Existing methods may not sufficiently obscure the communication channel, leaving it vulnerable to attacks.
    • The use of scattering media offers a novel approach to enhance physical layer security.

    Purpose of the Study:

    • To investigate the secrecy of an optical communication system employing two scattering layers.
    • To determine if intermediate speckle patterns correlate with the transmitted message, which could be exploited in an attack.
    • To assess the feasibility of a person-in-the-middle attack in this system.

    Main Methods:

    • Modulating binary messages as spatially shaped wavefronts transmitted through scattering layers.
    • Collecting 50,000 intermediate speckle patterns generated between the scattering layers.
    • Analyzing speckle pattern correlations using the Kolmogorov-Smirnov (K-S) test and K-Means/Hierarchical clustering algorithms.

    Main Results:

    • No statistically significant correlation was found between the intermediate speckle patterns and the transmitted message.
    • The high number of transmission modes in scattering layers allows for numerous uncorrelated wavefronts to transmit the same message, enhancing security.
    • The findings indicate that the system is resistant to eavesdropping attempts based on intermediate speckle analysis.

    Conclusions:

    • The proposed optical communication system with scattering layers offers enhanced physical layer security.
    • The absence of correlation between speckle patterns and the message prevents person-in-the-middle attacks.
    • This technique is compatible with existing digital encryption and applicable to optical wireless communication.