LAUSR

A new three-party quantum key agreement protocol based on seven-qubit states is proposed. In this protocol, each participant adopts different encryption methods to transmit a secret key of the same length. Subsequently, the participants utilize joint measurement to gain the ultimate shared secret key. No participant can determine the ultimate shared key by himself/herself. In addition, the proposed three-party quantum key agreement protocol could resist several well-known attacks. Compared with typical quantum key agreement protocols, our proposed three-party quantum key agreement protocol is more efficient.