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Chin. Phys. B, 2009, Vol. 18(4): 1333-1337    DOI: 10.1088/1674-1056/18/4/007
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Participant attack on quantum secret sharing based on entanglement swapping

Song Ting-Ting(宋婷婷)a)b)†, Zhang Jie(张劼)c), Gao Fei(高飞)a), Wen Qiao-Yan(温巧燕)a), and Zhu Fu-Chen(朱甫臣)d)
a State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China; b State Key Laboratory of Integrated Services Network, Xidian University, Xi'an 710071, China; c School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China; d National Laboratory for Modern Communications, P.O. Box 810, Chengdu 610041, China
Abstract  The security of quantum secret sharing based on entanglement swapping is revisited and a participant attack is presented. In this attack two dishonest agents together can illegally recover the secret quantum state without the help of any other controller, and it will not be detected by any other users. Furthermore, by modifying the distribution process of particles and adding a detection step after each distribution process, we propose an improved protocol which can resist this kind of attack.
Keywords:  quantum secret sharing      entanglement swapping      the Bell measurement      two-particle entangled state  
Received:  08 July 2008      Revised:  05 August 2008      Accepted manuscript online: 
PACS:  03.65.Ud (Entanglement and quantum nonlocality)  
  03.67.Dd (Quantum cryptography and communication security)  
  03.67.Hk (Quantum communication)  
Fund: Project supported by the National High Technology Research and Development Program of China (Grant No 2006AA01Z419), the Major Research Plan of the National Natural Science Foundation of China (Grant Nos 90604023, 60873191 and 60821001), the National Labo

Cite this article: 

Song Ting-Ting(宋婷婷), Zhang Jie(张劼), Gao Fei(高飞), Wen Qiao-Yan(温巧燕), and Zhu Fu-Chen(朱甫臣) Participant attack on quantum secret sharing based on entanglement swapping 2009 Chin. Phys. B 18 1333

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