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Cryptanalysis and improvement of a quantum secret sharing scheme based on $\chi$-type entangled states |
| Zhu Zhen-Chao(朱珍超)a)b), Zhang Yu-Qing(张玉清)b)†, and Fu An-Min(付安民)b) |
| a Information Security Research Center, Southeast University, Nanjing 210096, China; b National Computer Network Intrusion Protection Center, Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract In the paper [2010 Chin. Phys. B 19 050306], Yang et al. put forward a novel three-party quantum secret sharing protocol of secure direct communication based on $\chi$-type entangled states, they claimed that the scheme is secure. However, in this paper, we study the security of the protocol and find that it is insecure. Applying intercept and resend attack, the agent Bob can obtain Alice's secret without the help from the other agent Charlie. In the end, we give our effective modification for its improvement.
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Received: 13 May 2011
Revised: 07 July 2011
Accepted manuscript online:
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PACS:
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03.67.Dd
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(Quantum cryptography and communication security)
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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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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60970140). |
Cite this article:
Zhu Zhen-Chao(朱珍超), Zhang Yu-Qing(张玉清), and Fu An-Min(付安民) Cryptanalysis and improvement of a quantum secret sharing scheme based on $\chi$-type entangled states 2012 Chin. Phys. B 21 010307
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