摘要： 提出一种新的带认证的三方量子安全直接通信协议。该方案利用共享的三粒子部分纠缠态和CNOT门来编码和译码，两方可同时向第三方传递秘密消息，共享的部分纠缠态可重复使用。在理想信道下，协议对于非相干攻击是安全的。该方案通过认证可以验证客户端身份的合法性，部分纠缠态在实际中容易制备和保存，能够实现两方同时跟第三方直接通信。

关键词: 密码学, 量子密码学, 量子安全直接通信, 部分纠缠态

Abstract: This paper proposes a new three-party quantum secure direct communication protocol with authentication. The scheme uses three-particle partially entangled states and CNOT gate to encode and decode. Two users can simultaneously transmit secret message to the third party, and partially entangled states shared can be used repeatedly. In ideal channel, the protocol is secure against incoherent attack. The advantage of the scheme is that through authentication, one can confirm the client’s legitimate identity, partially entangled states are easy to prepare and store in practice, and two users can simultaneously communicate with the third party.

Key words: cryptography, quantum cryptography, quantum secure direct communication, partially entangler state

中图分类号: 

• TN918.1