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Eavesdropper's Optimal Information in Variations of Bennett-Brassard 1984 Quantum Key Distribution in the Coherent Attacks
Hwang, W Y, Ahn, D, Hwang, S W
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Abstract
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.