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arXiv:quant-ph/0612066

Improving the security of multiparty quantum secret sharing based on entanglement swapping against participant attack

Song Lin, Fei Gao, Fen-Zhuo Guo, Qiaoyan Wen, Fu-Chen Zhu

Published Dec 9, 2006• 0 citations
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Abstract

In a recent paper [Z. J. Zhang and Z. X. Man, Phys. Rev. A 72, 022303(2005)], a multiparty quantum secret sharing protocol based on entanglement swapping was presented. However, as we show, this protocol is insecure in the sense that an unauthorized agent group can recover the secret from the dealer. Hence, we propose an improved version of this protocol which can stand against this kind of attack.

DOI
10.48550/arxiv.quant-ph/0612066

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In a recent paper [Z. J. Zhang and Z. X. Man, Phys. Rev. A 72, 022303(2005)], a multiparty quantum secret sharing protocol based on entanglement swapping was presented. However, as we show, this protocol is insecure in the sense that an unauthorized agent group can recover the secret from the dealer. Hence, we propose an improved version of this protocol which can stand against this kind of attack.
Based on the multiparty quantum secret sharing protocol [Z. J. Zhang and Z. X. Man, Phys. Rev. A 72, 022303 (2005)] , we proposed two schemes to enhance the transmission efficiency of whole protocol. In our improved version of the Zhang-Man protocol which the dealer can transmit double amount of secret messages at a time securely instead of doing the Zhang-Man protocol twice. Besides, we save a lot of cost of whole quantum secret sharing system. When the amount of secret messages is large and the number of agents is more, the performance of our schemes is much better than the ZhangMan protocol.
Extending the eavesdropping strategy devised by Zhang, Li, and Guo [Zhang, Li, and Guo, Phys. Rev. A 63, 036301 (2001)], we show that the multiparty quantum communication protocol based on entanglement swapping, which was proposed by Cabello (e-print quant-ph∕0009025), is not secure. We modify the protocol so that entanglement swapping can secure multiparty quantum communication, such as multiparty quantum key distribution and quantum secret sharing of classical information, and show that the modified protocol is secure against the Zhang-Li-Guo strategy for eavesdropping as well as the basic intercept-resend attack.