US Patent 10979409 Bluetooth device and working method thereof

The present disclosure provides a Bluetooth device and a working method thereof, which relates to application in information security field. The Bluetooth device includes a Bluetooth connecting module, a pairing module and a data communicating module. The working method includes a Bluetooth connecting process, a pairing process and a data communicating process, where the pairing process includes that the device computes an encryption key according to a preset authentication code, a first random number obtained from an initiator, a second random number generated by the device, encrypt the link encryption data containing a link encryption key by using the encryption key to obtain a link encryption request and sends the link encryption request to the imitator, and the initiator obtains the link encryption key from the link encryption request. The disclosure is compatible to the present Bluetooth protocol and enhances security in the Bluetooth device pairing process as well.