  This study proposes a multiparty mediated quantum secret sharing (MQSS)
protocol that allows n restricted quantum users to share a secret via the
assistance of a dishonest third-party (TP) with full quantum capabilities.
Under the premise that a restricted quantum user can only perform the Hadamard
transformation and the Z-basis measurement, the proposed MQSS protocol has
addressed two common challenges in the existing semi-quantum secret sharing
protocols: (1) the dealer must have full quantum capability, and (2) the
classical users must equip with the wavelength quantum filter and the photon
number splitters (PNS) to detect the Trojan horse attacks. The security
analysis has also delivered proof to show that the proposed MQSS protocol can
avoid the collective attack, the collusion attack, and the Trojan horse
attacks. In addition, the proposed MQSS protocol is more efficient than the
existing SQSS protocols due to the restricted quantum users can only equip with
two quantum operations, and the qubits are transmitted within a shorter
distance.
