Multiparty Simultaneous Quantum Secure Direct Communication Based on GHZ States and Mutual Authentication

In the modern communication, multiparty communication plays a important role, and becomes more and more popular in the e-business and e-government society. In this paper, an efficient multiparty simultaneous quantum secure direct communication protocol is proposed by using GHZ states and dense coding, which is composed of two phases: the quantum state distribution process and the direct communication process. In order to prevent against the impersonators, a mutual identity authentication method is involved in both of the two processes. Analysis shows that it is secure against the eavesdropper's attacks, the impersonator's attacks, and some special Trent's attacks (including the attack by using different initial states). Moreover. Comparing with the other analogous protocols, the authentication method is more simple and feasible, and the present protocol is more efficient.