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

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

Published 2006-12-09Version 1

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.