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International Journal of Theoretical Physics

A Modified Quantum Key Distribution Without Public Announcement Bases Against Photon-Number-Splitting Attack

Song Lin, Xiao-Fen Liu

Published Mar 26, 2012• 12 citations
Publisher
DOI
10.1007/s10773-012-1131-9

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First, we calculate eavesdropper's optimal information on raw bits in Bennett-Brassard 1984 quantum key distribution (BB84 QKD) scheme and six-states one in coherent attacks, using the method by Lo and Chau [Science {\\bf 283}, 2050 (1999)]. Next, we show that eavesdropper's optimal information in multiple-basis scheme is the same as that of six-states one. Then, we consider QKD without public announcement of bases [Phys. Lett. A {\\bf244}(1998), 489]: we find that eavesdropper's optimal information in it is the same as that of a corresponding QKD with public announcement of bases. This fact suggests that QKD without public announcement of bases is as secure as BB84 scheme even in coherent attacks.