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A basic assumption that the attacker can not obtain information of quantum channel and classical channel simultaneously exists in quantum key distribution protocols.To overcome this hypothesis, a scheme using characteristics of quantum entanglements of authentication and key distribution is proposed based on GHZ state.The scheme has realized authentication of the three communicating parties with the help of the three particle correlation of GHZ and came up with the key distribution for communication and authentication by the use of the quantum teleportation after the quantum communication channel is established.So the identity can not be forged and the communication is secure.Finally we have proved the security of the protocol combined with some common attacks. 