# Experimental demonstration of time-shift attack against practical quantum key distribution systems

@article{Zhao2007ExperimentalDO,
title={Experimental demonstration of time-shift attack against practical quantum key distribution systems},
author={Yi Zhao and Chi-Hang Fred Fung and Bing Qi and Christine Chen and Hoi-Kwong Lo},
journal={Physical Review A},
year={2007}
}
• Yi Zhao, +2 authors H. Lo
• Published 24 April 2007
• Physics, Computer Science
• Physical Review A
Quantum-key-distribution (QKD) systems can send quantum signals over more than $100\phantom{\rule{0.3em}{0ex}}\mathrm{km}$ standard optical fiber and are widely believed to be secure. Here, we show experimentally a technologically feasible attack\char22{}namely, the time-shift attack\char22{}against a commercial QKD system. Our result shows that, contrary to popular belief, an eavesdropper, Eve, has a non-negligible probability $(\ensuremath{\sim}4%)$ to break the security of the system. Eve's…
354 Citations

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## References

SHOWING 1-10 OF 14 REFERENCES
"J."
however (for it was the literal soul of the life of the Redeemer, John xv. io), is the peculiar token of fellowship with the Redeemer. That love to God (what is meant here is not God’s love to men)
European Physical Journal D 41
• 599
• 2007
European Physical Journal D 41
• 599
• 2007
Nature 447
• 372
• 2007
Conf
• Ser. 36, 98
• 2006
Phys
• Rev. A 74, 022313
• 2006
Phys
• Rev. Lett. 95, 010503
• 2005
Phys
• Rev. Lett. 91, 057901 (2003); H.-K. Lo, X. Ma, and K. Chen, Phys. Rev. Lett. 94, 230504 (2005); X.-B. Wang, Phys. Rev. Lett. 94, 230503 (2005); X. Ma, et al., Phys. Rev. A 72, 012326 (2005); X.-B. Wang, Phys. Rev. A 72, 012322
• 2005
Quant
• Info. Compu. 5, 413
• 2005
in Theory of Cryptography: Second Theory of Cryptography Conference
• TCC 2005, Lecture Notes in Computer Science, edited by J. Kilian
• 2005