Journal Article10.1103/physreva.109.022424
Practical security of continuous-variable quantum key distribution with an optical amplifier
Yi Zheng,Yiliang Wang,Chenlei Fang,Haobin Shi,Wei Pan +4 more
- 20 Feb 2024
4
TL;DR: This study investigates the practical security of continuous-variable quantum key distribution with an optical amplifier, finding that a reverse external magnetic field can compromise security, leading to overestimated secret key rates and potential intercept-resend attacks.
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Abstract: In a practical continuous-variable quantum key distribution (CVQKD) system, the optical amplifier can be used to improve the performance of the system by compensating for the imperfections of the detectors. However, the eavesdropper Eve can actively utilize a reverse external magnetic field to deteriorate the performance of the optical amplifier, which may affect the practical security of the system. In this paper, we investigate the practical security of a CVQKD system with an optical amplifier under the effect of the reverse external magnetic field. Based on the investigation of the parameter estimation under the above influence, we find that the evaluation of the secret key rate may be overestimated, which will open a security loophole for Eve to successfully launch an intercept-resend attack in the practical CVQKD system with an optical amplifier. In order to close this security loophole, we can monitor the reverse external magnetic field or change the type of the optical isolator to make the secret key rate of the system evaluated exactly.
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Citations
Light-injection attack against practical continuous-variable measurement-device-independent quantum key distribution systems
Yiliang Wang,Yi Zheng,Chenlei Fang,Haobin Shi,Wei Pan +4 more
TL;DR: This study investigates the practical security of continuous-variable measurement-device-independent quantum key distribution systems against light-injection attacks, revealing a security loophole that allows Eve to obtain secret key information, and proposes countermeasures to enhance system security.
1
Mitigation of channel tampering attacks in continuous-variable quantum key distribution
Sebastian P. Kish,Chandra Thapa,Mikhael Sayat,H. Suzuki,Josef Pieprzyk,Seyit Camtepe +5 more
TL;DR: The CA attack manipulates the communication channel through amplification and can significantly impact the secret key rate. A detection and mitigation strategy based on machine learning is proposed to counter this threat. The strategy exhibits high accuracy in distinguishing and categorizing various attacks, including CA and DoS attacks. It improves the attacked secret key rate for CA attacks and, in some cases, for hybrid CA-DoS attacks.
Composable security analysis of linear optics cloning machine improved discretized polar modulation continuous-variable quantum key distribution
Ying He,Tianyi Wang,Yingying Li +2 more
TL;DR: This paper presents a composable security analysis of linear optics cloning machine (LOCM) improved discretized polar modulation continuous-variable quantum key distribution (CVQKD), demonstrating improved secret key rate and resistance to excess noise with optimal parameter tuning.
Composable security analysis of linear optics cloning machine enhanced discretized polar modulation continuous-variable quantum key distribution
Ying He,Wang Tianyi,Yingying Li +2 more
TL;DR: This paper presents a composable security analysis of linear optics cloning machine enhanced discretized polar modulation continuous-variable quantum key distribution, demonstrating improved secret key rate and resistance to excess noise with optimal parameter tuning.
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