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29 March 2024
 
  » arxiv » 1110.4574

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Attacking practical quantum key distribution system with wavelength dependent beam splitter and multi-wavelength sources
Hong-Wei Li ; Shuang Wang ; Jing-Zheng Huang ; Wei Chen ; Zhen-Qiang Yin ; Fang-Yi Li ; Zheng Zhou ; Dong Liu ; Yang Zhang ; Guang-Can Guo ; Wan-Su Bao ; Zheng-Fu Han ;
Date 20 Oct 2011
AbstractUnconditional security of quantum key distribution protocol can be guaranteed by the basic property of quantum mechanics. Unfortunately, the practical quantum key distribution system always have some imperfections, and the practical system may be attacked if the imperfection can be controlled by the eavesdropper Eve. Applying the fatal security loophole introduced by the imperfect beam splitter’s wavelength dependent optical property, we propose wavelength-dependent attacking model, which can be applied to almost all practical quantum key distribution systems with the passive state modulation and photon state detection after the practical beam splitter. Utilizing our attacking model, we experimentally demonstrate the attacking system based on practical polarization encoding quantum key distribution system with almost 100% success probability. Our result demonstrate that all practical devices require tightened security inspection for avoiding side channel attacks in practical quantum key distribution experimental realizations.
Source arXiv, 1110.4574
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