High‑efficient Quantum Co-signature Scheme

Efficiency and security have always been the basic criteria for designing quantum signature schemes. Some existing quantum signature schemes use a large number of quantum entangled states, which not only increases the cost, but also affects the efficiency. A high-efficient quantum co-signature scheme is designed using only the two-particle quantum state and the Bell state, in which the quantum source are reduced and the efficiency is improved. The performance of the proposed scheme is evaluated from the aspects of security and efficiency, and the analysis shows that the new scheme is secure and efficient. Furthermore, the proposed novel high-efficient quantum co-signature scheme can be implemented by existing physical techniques.