3+1Buttons 95440-F2000 Smart Car Key for 2016-2018 Hyundai Elantra

Tips

L2CAP connection-oriented channel:

L2CAP performs a simple encapsulation of LL. LL is only related to the data itself. L2CAP needs to distinguish between time-encrypted channels and ordinary channels, and at the same time manage the connection gap.

Finally, the BLE device pairing process is as follows:

1. Actively initiate pairing: the device sends a BLE pairing request to the vehicle. The vehicle sends a BLE pairing response to the device;

2. Public key exchange: The device sends the BLE pairing public key to the vehicle. The vehicle sends the BLE pairing public key to the device. Devices and vehicles generate DHKey;

3. Generate LTK (Long Term Connection Security Key): Both the device and the vehicle verify that the confirmation values received as part of the OOB pairing preparation procedure match. Equipment and vehicles generate 1 random number (Na and Nb). The device sends (Na) to the vehicle, and the vehicle sends (Nb) to the device;

4. LTK calculation: Once the DHKey on the device and vehicle is generated, the device and vehicle will calculate their LTK;

5. DHKey check: The device sends the check value (Ea) to the vehicle, and the vehicle sends the check value (Eb) to the device. Both the device and the vehicle need to verify these values;

6. Key distribution;

7. Enable device and vehicle encryption: Devices and vehicles will add each other to their private geocoding lists.