Experimental NFC Pairing Example Question

RE: Experimental NFC Pairing Example Question

hkartadi — Mon, 03 Apr 2017 07:41:09 GMT

thank you for the explanation, will explore again..

RE: Experimental NFC Pairing Example Question

Michal — Mon, 03 Apr 2017 06:57:12 GMT

Hi,

first of all, pairing procedure triggered from NFC doesn't necessarily have to use the OOB pairing method. It is always up to the phone (or generally BLE Central device) whether or not to use the security data available in the NFC.

So basically in your case, the phone performs the pairing, but it uses the Just Works method. It takes BLE device address, flags and BLE Role fields from the NFC tag and sends a Pairing Request with OOB flag cleared that's why it results with Security Mode 1, Level 2

Starting from Android 7.1, the system uses the security information from the NFC tag to perform authenticated pairing (Out-of-Band pairing method). The security data can be:

Security Manager TK value (for Legacy Pairing, BT Core < 4.2)
Secure Connections Random and Confirmation values (for Secure Connections pairing, BT Core >= 4.2)

Note that in case of Legacy Pairing, both devices must set the OOB flag (in Pairing Request and Response) to perform the OOB pairing. For LE Secure Connections to perform OOB pairing it is enough that at least one device sets the OOB flag (Pairing Request and/or Pairing Response).

An example that uses Numeric Comparison is: examples\ble_central_and_peripheral\experimental\ble_app_multirole_lesc

RE: Experimental NFC Pairing Example Question

hkartadi — Fri, 31 Mar 2017 06:31:12 GMT

Basically I am quite confused, my phone is just fine, it can do the OOB pairing based on the NFC example. However it is always show up as Security mode 1 level 2 which means it is "an unauthenticated pairing with encryption". I thought anything that uses OOB is always "an authenticated pairing" which brings it to level 4?

RE: Experimental NFC Pairing Example Question

Sigurd — Thu, 30 Mar 2017 10:32:39 GMT

Hi,

What phone are you using? Note that OOB support was first added in Android 7(Nougat). See this blog post for more information.