中国物理B ›› 2012, Vol. 21 ›› Issue (6): 60303-060303.doi: 10.1088/1674-1056/21/6/060303
张盛, 王剑, 唐朝京
Zhang Sheng(张盛)†, Wang Jian(王剑), and Tang Chao-Jing(唐朝京)
摘要: 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.
中图分类号: (Quantum cryptography and communication security)