https://doi.org/10.1140/epjqt/s40507-024-00235-z
Research
Cryptanalysis and improvement of efficient multiparty quantum secret sharing based on a novel structure and single qubits
1
Department of Electrical Engineering, Tongling University, 244061, Tongling, China
2
AnHui Engineering Research Center of Intelligent Manufacturing of Copper-Based Materials, Tongling University, 244061, Tongling, China
3
Anhui Joint Key Laboratory of Critical Technologies for High-End Copper-Based New Materials, Tongling University, 244061, Tongling, China
Received:
10
December
2023
Accepted:
14
March
2024
Published online:
25
March
2024
In the paper (EPJ Quant. Technol. 10:29, 2023), Kuo et al. proposed a multiparty quantum secret sharing protocol based on a novel structure and single qubits. Owing to the absence of an entanglement state, the proposed protocol is more practical than other quantum secret sharing protocols which use entanglement properties. Therefore, we study the security of the proposed protocol and find there exists a security loophole in the n-party (
) secret sharing case in it, that is, two dishonest agents can collude to obtain (part of) Alice’s secret without the help of the other agents. In order to overcome the security loophole, we give an improved protocol and make a security analysis for it. By calculating, the qubit efficiency of the three-party case in it is equal to 
, which is higher than that in Hillery et al.’s protocol (Phys. Rev. A 59:1829, 1999).
Key words: Security loophole / Quantum secret sharing / Single qubits / Rearranging orders
© The Author(s) 2024
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