Multi-party quantum dialogue protocol based on multi-particle GHZ states

In this paper, we present an innovative quantum dialogue protocol for multiple users to get private information from each other without leaking any information. In our protocol, a semi-honest third party (TP) is introduced to assist multiple participants for exchanging their private information. Specifically, exploiting multi-particle entangled GHZ states as the information carriers, we investigate how to implement the multi-party quantum dialogue protocol and perform the equivalence comparison. We also analyze the security of our protocol. Compared with previous quantum dialogue protocols, our protocol is more flexible and more efficient.