How secure is Bluetooth?

Bluetooth has several security measures in which it uses several layers of data encryption and user authentication measures. Bluetooth devices use a combination of the Personal Identification Number (PIN) and a Bluetooth address to identify other Bluetooth devices. Data encryption (i.e., 128-bit or 56-bit) can be also used to enhance Bluetooth security. The transmission scheme provides another level of security in itself, in which Bluetooth radios use a fast frequency-hopping spread spectrum (FHSS) technique, allowing only synchronized receivers to access the transmitted data.


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