6. Bluetooth Security
6.3 Pairing and Authentication Procedures
LMP-Pairing is a procedure that authenticates two devices, based on a PIN, and subsequently creates a common link key that is used as the basis for a trusted relationship or a secure connection. This procedure consists of the steps (Figure 5): creation of an initialization key (based on a random number and PIN (PNBB here)), LMP-authentication based on the initialization key and creation of the common link key.
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Figure 5: LMP-pairing flow-chart. |
LMP-authentication (Figure 6) is a procedure for verifying the identity of a remote device. The procedure is based on a challenge-response mechanism using a random number, a secret key and the BD_ADDR of the non-initiating device. The secret key can be a previously exchanged link key or an initialization key created based on a PIN as used in pairing procedure.
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Figure 6: LMP-authenticate procedure. |
