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

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

Content Provider	MDPI
Author	Pan, Yaxi Zhang, Ling Huang, Duan
Copyright Year	2020
Description	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.
Starting Page	7788
e-ISSN	20763417
DOI	10.3390/app10217788
Journal	Applied Sciences
Issue Number	21
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2020-11-03
Access Restriction	Open
Subject Keyword	Applied Sciences Quantum Science and Technology Cv-qkd Trojan Horse Attacks Security Bounds
Content Type	Text
Resource Type	Article

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