Revisiting the security of quantum dialogue and bidirectional quantum secure direct communication

Details Revisiting the security of quantum dialogue and bidirectional quantum secure direct communication Revisiting the security of quantum dialogue and bidirectional quantum secure direct communication

2008-01-16

arxiv.org/abs/0801.2420v2

Science in China Series G: Physics, Mechanics & Astronomy, Vol.51, No.5, pp.559-566, 2008

Physics

Quantum Physics

An authors' note was added. That is, when this study was completed, we found that the insecurity of quantum dialogue was indep

Scientific paper

10.1007/s11433-008-0065-y

From the perspective of information theory and cryptography, we analyze the security of two quantum dialogue protocols and a bidirectional quantum secure direct communication (QSDC) protocol, and point out that the transmitted information would be partly leaked out in them. That is, any eavesdropper can elicit some information about the secrets from the public annunciations of the legal users. This phenomenon should have been strictly forbidden in a quantum secure communication. In fact, this problem exists in quite a few recent proposals and, therefore, it deserves more research attention in the following related study.

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