Research On Quantum Dialogue Protocol Based On Identity Authentication

Quantum dialogue enabled both communication parties to exchange information simultaneously and directly.By introducing the concept of semi-quantum,some users of quantum dialogue do not need to have expensive quantum equipment,which greatly enhances the practicality of quantum dialogue in quantum communication.At present,most quantum dialogue protocols are proposed under the assumption that all users are legitimate.In reality,this is not always the case.Therefore,it is necessary to authenticate the identity legitimacy of all users in protocol.In this thesis,the problems related to quantum dialogue protocols and semi-quantum dialogue protocols are studied by adding identity authentication,and the main contents are described as follows.1.A quantum dialogue protocol with identity authentication.First,the quantum circuit diagram is given to prepare the four-particle entangled state,and the entangled state is investigated in terms of the nonlocal correlation properties.Then,a quantum dialogue protocol is constructed by introducing identity authentication.In this protocol,the combination of identity authentication and the channel security detection reduces the consumption of quantum resources to a certain extent.Meanwhile,a random number and a one-way hash function are added to increase the security of the protocol.In the end,our protocol has a significant improvement in efficiency by comparison.2.A four-party authenticated semi-quantum dialogue protocol based on the Brown states.First,by introducing the semi-quantum concept and identity authentication techniques,we construct a semi-quantum dialogue protocol using the Brown states as the channel.Then,it is extended to -party using the generalized Brown states.Through security and efficiency analysis,it is confirmed that this protocol is without information leakage,can effectively resist various external attacks,and has relatively high quantum communication efficiency.