Improved Three-Party Quantum Secret Sharing Based on Bell States

Hwang et al. (Phys. Scr. 83:045004, 2011) proposed a high efficient multiparty quantum secret sharing by using Greenberger-Horne-Zeilinger (GHZ) states. But Liu et al. (Phys. Scr. 84:045015, 2011) analyzed the security of Hwang et al.’s protocol and found that it was insecure for Charlie who might obtain half of information about the dealer’s secret directly. They put forward an improved protocol by adding operation on photons in sequence S3. However, we point out Liu et al.’s protocol is not secure too if a dishonest participant Charlie carries out intercept-resend attack. And a further improved quantum secret sharing protocol is proposed based on Bell states in this paper. Our newly proposed protocol can stand against participant attack, provide a higher efficiency in transmission and reduce the complexity of implementation.

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