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Quantum Cryptography Security

Risk analysis of Trojan-horse attacks on practical quantum key distribution systems

arXiv

Authors: Nitin Jain, Birgit Stiller, Imran Khan, Vadim Makarov, Christoph Marquardt, Gerd Leuchs

Year

2014

Paper ID

48261

Status

Preprint

Abstract Read

~2 min

Abstract Words

115

Citations

N/A

Abstract

An eavesdropper Eve may probe a quantum key distribution (QKD) system by sending a bright pulse from the quantum channel into the system and analyzing the back-reflected pulses. Such Trojan-horse attacks can breach the security of the QKD system if appropriate safeguards are not installed or if they can be fooled by Eve. We present a risk analysis of such attacks based on extensive spectral measurements, such as transmittance, reflectivity, and detection sensitivity of some critical components used in typical QKD systems. Our results indicate the existence of wavelength regimes where the attacker gains considerable advantage as compared to launching an attack at 1550 nm. We also propose countermeasures to reduce the risk of such attacks.

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An eavesdropper Eve may probe a quantum key distribution (QKD) system by sending a bright pulse from the quantum channel into the system and analyzing the back-reflected pulses.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1408.0492 [2] arXiv https://arxiv.org/abs/1408.0492 [3] Publisher https://arxiv.org/abs/1408.0492

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