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Revisiting Quantum Secure Direct Communication with W State |
| LIU Jun1;LIU Yi-Min2,3;CAO Hai-Jing4;SHI Shou-Hua1;ZHANG Zhan-Jun1,3 |
| 1Key Laboratory of Optoelectronic Information Acquisition and Manipulation of Ministry of Education of China,School of Physics and Material Science, Anhui University, Hefei 230039
2Department of Physics, Shaoguan University, Shaoguan 512005
3The State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
4Department of Physics, Dalian University of Technology, Dalian 116024 |
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| Cite this article: |
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LIU Jun, LIU Yi-Min, CAO Hai-Jing et al 2006 Chin. Phys. Lett. 23 2652-2655 |
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Abstract The quantum secure direct communication protocol recently proposed by Cao and Song [Chin. Phys. Lett. 23(2006)290] (i.e., the C-S QSDC protocol) is revisited. A security leak is pointed out. Taking advantage of this leak, an eavesdropper may adopt the intercept--measure--resend strategy to attack the quantum channel such that in the C-S QSDC protocol the secret message can be completely eavesdropped. To fix the leak, the original version of the C-S QSDC protocol is revised. As a consequence, the security is improved and assured at least in the case of an ideal quantum channel.
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| Keywords:
03.67.Dd
03.65.Ta
89.70.+c
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Published: 01 October 2006
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| PACS: |
03.67.Dd
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(Quantum cryptography and communication security)
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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89.70.+c
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