An efficient semi-quantum secret sharing protocol of specific bits

Quantum secret sharing (QSS) allows a trusted party to distribute the secret keys to a group of participates, who can only access the secret cooperatively. The semi-quantum secret sharing (SQSS) takes fewer quantum resources and has higher efficiency than the QSS protocol. However, in the existing SQSS protocols, the shared secrets are generated according to the random operations of Bob and Charlie, which are inefficient and uncertain. An efficient semi-quantum secret sharing protocol based on Bell states was proposed, where Alice can share the specific secrets with Bob and Charlie, by encoding her secrets on the two different Bell states. Then, the security analysis shows that this scheme is secure against intercept-resend attack, entangle-measure attack and Trojan horse attack. Compared with similar studies, the proposed scheme is more flexible and practical, and the qubit efficiency is increased by about 100%.