Cryptanalysis of efficient multiparty quantum secret sharing based on a novel structure and single qubits

Abstract

Quantum secret sharing is a basic quantum cryptographic primitive, which has a lot of applications in information security and privacy preservation. An efficient multiparty quantum secret sharing protocol [EPJ Quantum Technology 2023 10: 29] based on a novel structure and single qubits was reported recently. In this paper, we give a cryptanalysis of this protocol and show that it cannot satisfy the security requirement for secret sharing because an unauthorized set of agents can gain access to some information on the dealer's secret by a special collusion attack. Furthermore, we put forward an effective way to deal with the security problem.