A privacy information transmission method, which is performed by a network device, the method comprising: generating authentication information in response to receiving an identity registration request message sent by a terminal device via a base station, the identity registration request message carrying a globally unique temporary identity, GUTI, of the terminal device, and encrypting the authentication information with a first private key to generate encrypted authentication information; sending a first identity identification request message carrying the encrypted authentication information to the terminal device; receiving an identity identification response message returned by the terminal device in response to the authentication information being determined as valid by the terminal device, and acquiring privacy information from the identity identification response message; wherein the authentication information comprises a timestamp, and the authentication information being determined as valid comprises: the timestamp being determined as consistent with the current time; and determining by the network device that the identity of the terminal device is authentic if privacy data is correct; wherein subsequent to the sending of a first identity identification request message to the terminal device, the method further comprises: receiving an identity identification acknowledgment message returned by the terminal device, and acquiring a second public key from the identity identification acknowledgment message; generating a temporary key, encrypting the temporary key with the second public key to generate an encrypted temporary key, generating a second identity identification request message carrying the encrypted temporary key, and sending the second identity identification request message to the terminal device; the acquiring of privacy information from the identity identification response message comprises: acquiring encrypted privacy data carried in the identity identification response message, wherein the privacy information comprises the encrypted privacy data; and subsequent to the acquiring of privacy information from the identity identification response message, the method further comprises: decrypting the encrypted privacy data with the temporary key to generate the privacy data. generating authentication information in response to receiving an identity registration request message sent by a terminal device via a base station, the identity registration request message carrying a globally unique temporary identity, GUTI, of the terminal device, and encrypting the authentication information with a first private key to generate encrypted authentication information; sending a first identity identification request message carrying the encrypted authentication information to the terminal device; receiving an identity identification response message returned by the terminal device in response to the authentication information being determined as valid by the terminal device, and acquiring privacy information from the identity identification response message; wherein the authentication information comprises a timestamp, and the authentication information being determined as valid comprises: the timestamp being determined as consistent with the current time; and determining by the network device that the identity of the terminal device is authentic if privacy data is correct; wherein subsequent to the sending of a first identity identification request message to the terminal device, the method further comprises: receiving an identity identification acknowledgment message returned by the terminal device, and acquiring a second public key from the identity identification acknowledgment message; generating a temporary key, encrypting the temporary key with the second public key to generate an encrypted temporary key, generating a second identity identification request message carrying the encrypted temporary key, and sending the second identity identification request message to the terminal device; the acquiring of privacy information from the identity identification response message comprises: acquiring encrypted privacy data carried in the identity identification response message, wherein the privacy information comprises the encrypted privacy data; and subsequent to the acquiring of privacy information from the identity identification response message, the method further comprises: decrypting the encrypted privacy data with the temporary key to generate the privacy data.