Due to the influence of external environment and internal factors, the security of quantum dialogue is facing huge challenges. In order to improve the security of quantum dialogue, we proposed the feasible and efficient quantum dialogue protocol with hyperentangled states in discrete-time quantum walk. In the proposed protocol, the trusted third party and both communicating parties entangle themselves via GHZ states and distribute their secret keys. The communicating party(Alice) prepares and signs her message and obtains an entangled quantum set of message and signature. And the other communicating party(Bob) verifies Alice’s signature with the the trusted third party’s help. Then, Alice and Bob perform a discrete-time quantum walk in the network until they meet at a node. Meanwhile, Alice and Bob have a quantum dialogue at the node where they meet. We provide detailed security analysis of the proposed protocol. Security analysis of the proposed protocol against both inside and outside attacks proves that attackers cannot extract any secret information.

中文翻译：

---

基于超纠缠态的离散时间量子行走中的量子对话协议

由于受外部环境和内部因素的影响，量子对话的安全性面临巨大挑战。为了提高量子对话的安全性，我们提出了一种在离散时间量子行走中具有超纠缠态的可行且高效的量子对话协议。在提议的协议中，可信第三方和通信双方通过 GHZ 状态纠缠自己并分发他们的秘密密钥。通信方（Alice）准备并签署她的消息，并获得纠缠的消息和签名量子集。而另一个通信方（Bob）在受信任的第三方的帮助下验证 Alice 的签名。然后，Alice 和 Bob 在网络中执行离散时间量子游走，直到他们在一个节点相遇。同时，Alice 和 Bob 在他们相遇的节点进行了一次量子对话。我们提供了所提议协议的详细安全分析。针对内部和外部攻击的提议协议的安全性分析证明攻击者无法提取任何秘密信息。