Robust continuous-variable quantum key distribution against practical attacks

Huang, Peng; Huang, Jianheng; Wang, Tao; Li, Huasheng; Huang, Duan; Zeng, Guihua

doi:10.1103/physreva.95.052302

Cited by 27 publications

(8 citation statements)

References 29 publications

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“…However, the transfer of LO will open some loopholes for eavesdroppers. The loopholes can be exploited to conduct some attacks such as wavelength attacks, saturation attacks, and LO fluctuation attack [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

Zou

Mao

et al. 2020

Applied Sciences

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Establishing high-rate secure communications is a potential application of continuous-variable quantum key distribution (CVQKD) but still challenging for the long-distance transmission technology compatible with modern optical communication systems. Here, we propose a photon subtraction-induced plug-and-play scheme for enhancing CVQKD with discrete-modulation (DM), avoiding the traditional loopholes opened by the transmission of local oscillator. A photon subtraction operation is involved in the plug-and-play scheme for detection while resisting the extra untrusted source noise of the DM-CVQKD system. We analyze the relationship between secret key rate, channel losses, and untrusted source noise. The simulation result shows that the photon-subtracted scheme enhances the performance in terms of the maximal transmission distance and make up for the deficiency of the original system effectively. Furthermore, we demonstrate the influence of finite-size effect on the secret key rate which is close to the practical implementation.

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Section: Introductionmentioning

confidence: 99%

Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

Zou

Mao

et al. 2020

Applied Sciences

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“…The practical security analysis of CV-QKD has also begun to gain attention in recent years. Intercept-resent attack [16,17], calibration attack [18,19], local oscillator intensity attack [20], saturation attack [21], and wavelength attack [22,23] are more attractive. The quantum channel is a portal that eavesdroppers can use (see in Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Practical Security Bounds against Trojan Horse Attacks in Continuous-Variable Quantum Key Distribution

2020

Self Cite

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As the existence of non-zero reflection coefficients in the real component of continuous-variable quantum key distribution (CV-QKD) systems, Eve can probe the system by sending the bright light pulses into Alice’s set-up. With the analysis of back-reflections, Eve only takes a few back-reflected photons to intercept information and obtain the raw key bit. In this paper, the attack problems are converted into the information leakage problems. First, we analyzed the Trojan horse attacks with different wavelengths and confirmed its side effects, such as crosstalk and anti-Stokes Raman scattering, by a numerical simulation. Then, based on the wavelength-dependent property of beam splitter, we presented a practical way to estimate the deviation of shot noise and therefore correct the excess noise by inserting different wavelength pulses under joint attacks. Finally, we specified the security bounds of the system through quantifying the excess noise bounds caused by the Trojan horse attacks and provided a theoretical reference for the secret key transmission of system. As a consequence, the transmission errors within the security bounds can be negligible and the legitimate users will not perceive the presence of Eve.

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“…The LO transmitted in the insecure quantum channel is most likely to be controlled and manipulated by eavesdroppers who may cause practical attacks on GMCS-CVQKD system, such as the LO fluctuation attack [7], the wavelength attack [8] and the saturation attack [9]. Although some solutions have been proposed to enhance the security of practical systems [10] [11] [12] [13], it is difficult to protect practical systems against all the potential loopholes caused by the LO transmission have been discovered.…”

Section: Introductionmentioning

confidence: 99%

Practical Security of the Continuous-Variable Quantum Key Distribution with Locally-Generated Local Oscillators

Huang¹,

Zhu²,

Tang³

et al. 2019

JAMP

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Continuous-variable quantum key distribution (CVQKD) with the local local oscillator (LLO) is confronted with new security problems due to the reference pulses transmitted together with quantum signals over the insecure quantum channel. In this paper, we propose a method of phase attack on reference pulses of the LLO-CVQKD with time-multiplexing. Under this phase attack, the phase drifts of reference pulses are manipulated by eavesdroppers, and then the phase compensation error is increased. Consequently, the secret key rate is reduced due to the imperfect phase compensation for quantum signals. Based on the noise model of imperfect phase compensation, the practical security of LLO-CVQKD under phase attack is analyzed. The simulation results show that the practical security is reduced due to the phase attack, yet it is still tight when system parameters are estimated by training signals.

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Robust continuous-variable quantum key distribution against practical attacks

Cited by 27 publications

References 29 publications

Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

Practical Security Bounds against Trojan Horse Attacks in Continuous-Variable Quantum Key Distribution

Practical Security of the Continuous-Variable Quantum Key Distribution with Locally-Generated Local Oscillators

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