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Security proof of counterfactual quantum cryptography against general intercept-resend attacks and its vulnerability |
| Zhang Sheng(张盛)†, Wang Jian(王剑), and Tang Chao-Jing(唐朝京) |
| School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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Abstract Counterfactual quantum cryptography, recently proposed by Noh, is featured with no transmission of signal particles. This exhibits evident security advantages, such as its immunity to the well-known photon-number-splitting attack. In this paper, the theoretical security of counterfactual quantum cryptography protocol against the general intercept-resend attacks is proved by bounding the information of an eavesdropper Eve more tightly than in Yin's proposal [Phys. Rev. A 82 042335 (2010)]. It is also shown that practical counterfactual quantum cryptography implementations may be vulnerable when equipped with imperfect apparatuses, by proving that a negative key rate can be achieved when Eve launches a time-shift attack based on imperfect detector efficiency.
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Received: 23 October 2011
Revised: 04 January 2012
Accepted manuscript online:
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PACS:
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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42.50.Ex
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(Optical implementations of quantum information processing and transfer)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No 60872052). |
Corresponding Authors:
Zhang Sheng
E-mail: shengzhcn@gmail.com
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Cite this article:
Zhang Sheng(张盛), Wang Jian(王剑), and Tang Chao-Jing(唐朝京) Security proof of counterfactual quantum cryptography against general intercept-resend attacks and its vulnerability 2012 Chin. Phys. B 21 060303
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