We come up with a special attack strategy to the multiparty quantum secret sharing protocol (Z.J. Zhang, Y. Li, Z.X. Man, Phys. Rev. A 71 (2005) 044301). Using fake signal and Bell measurement, the agent Bob who generates the initial signals can elicit Alice's secret message. With little modification, our strategy also works for an improved version of this protocol. At last, a further improvement of the multiparty quantum secret sharing protocol is proposed.
Physics Letters A – Elsevier
Published: Sep 4, 2006
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