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Cryptanalysis of an Improved Flexible Ping-Pong Protocol in Perfect and Imperfect Quantum Channels |
| ZHANG Bin-Bin1, WANG Da-Qing1, HUANG Shan-Shan2, LIU Yu2 |
| 1College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 4300742Department of Electronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074 |
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ZHANG Bin-Bin, WANG Da-Qing, HUANG Shan-Shan et al 2009 Chin. Phys. Lett. 26 100305 |
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Abstract We recently proposed a flexible quantum secure direct communication protocol [Chin. Phys. Lett. 23(2006)3152]. By analyzing its security in the perfect channel from the aspect of quantum information theory, we find that an eavesdropper is capable of stealing all the information without being detected. Two typical attacks are presented to illustrate this point. A solution to this loophole is also suggested and we show its powerfulness against the most general individual attack in the ideal case. We also discuss the security in the imperfect case when there is noise and loss.
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| Keywords:
03.67.Hk
03.65.Ud
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Received: 24 February 2009
Published: 27 September 2009
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| PACS: |
03.67.Hk
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(Quantum communication)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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