Authenticator and communication method therefor

A method for making communication with an authenticator, wherein the method comprises the following Steps:

• S1) powering up, by an authenticator, to enter a connecting mode;
• S2) scanning, by the authenticator, broadcast data, obtaining a first client identification in the broadcast data, obtaining a first key stored in the authenticator, verifying the first client identification according to the first key, if verifying is successful, executing Step S3;
• if verifying is failed, rescanning the broadcast data;
• S3) generating, by the authenticator, a second authenticator identification according to the first key, obtaining a second key corresponding to the first key, generating a second session key according to the second key, notifying that verifying the first client identification is successful, and stopping scanning and broadcasting the broadcast data comprising the second authenticator identification;
• S4) receiving, by the authenticator, a request for building a Bluetooth connection sent from the client, building the Bluetooth connection with the client, waiting for receiving a handshake command sent from the client, and when the handshake command is received, executing Step 105;
• S5) obtaining, by the authenticator, client data and a client data digest value in the handshake command, obtaining a second handshake key by performing computation via the second session key, verifying the client data according to the second handshake key, the client data and the client data digest value, if verifying is successful, performing computation on authenticator data via the second handshake key to obtain an authenticator data digest value, and sending a handshake response comprising the authenticator data and the authenticator data digest value to the client, then executing Step S6;
• S6) waiting for, by the authenticator, receiving an operating command sent from the client, and when the operating command is received, executing Step S7;
• and
• S7) obtaining, by the authenticator, cipher data in the operating command, performing computation via the second session key to obtain a second encrypting key, decrypting the cipher data via the second encrypting key to obtain operating data, performing corresponding computation according to the operating data to obtain operating result data, performing computation on the operating result data via the second encrypting key to obtain operating response data, and sending an operating response comprising the operating response data to the client.