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Light-injection attack against practical continuous-variable measurement-device-independent quantum key distribution

Yiliang Wang, Yi Zheng, Chenlei Fang

    Optics Express
    |November 22, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Light-injection attacks threaten continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) by causing overestimation of secret key rates. This research details these attacks and proposes countermeasures to secure CV-MDI QKD systems.

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    Area of Science:

    • Quantum Information Science
    • Cybersecurity
    • Applied Physics

    Background:

    • Continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) offers robust defense against detection-side attacks.
    • The source side remains vulnerable to sophisticated quantum hacking techniques.
    • Understanding and mitigating source-side attacks is crucial for practical CV-MDI QKD security.

    Purpose of the Study:

    • To investigate the practical security vulnerabilities of CV-MDI QKD systems subjected to light-injection attacks.
    • To analyze the impact of specific light-injection attacks, namely induced-photorefractive and strong-power injection attacks.
    • To evaluate the effectiveness of proposed countermeasures against these security threats.

    Main Methods:

    • Description and analysis of two distinct light-injection attacks: induced-photorefractive and strong-power injection attacks.
    • Examination of three attack scenarios targeting one or both parties in a CV-MDI QKD system.
    • Parameter estimation analysis to determine the effect of attacks on secret key rates.

    Main Results:

    • Light-injection attacks lead to an overestimation of the secret key rate in CV-MDI QKD systems.
    • These attacks create security loopholes, enabling eavesdroppers (Eve) to potentially acquire secret key information.
    • The analyzed light-injection attacks are more detrimental than laser-damage attacks, utilizing lower injected light power.

    Conclusions:

    • Light-injection attacks pose a significant practical threat to the security of CV-MDI QKD systems.
    • Enhancing system security can be achieved through material modification (doping lithium niobate) or protective devices (isolators, filters).
    • Detection methods using intensity monitors or photodetectors can help identify light-injection attacks.