Project #032: OOB Pairing

Project #032: OOB Pairing | Cypress Semiconductor

Project #032: OOB Pairing

April 03, 2015

By Pushek Madaan

When thinking of controlling critical devices such as security locks etc. via Bluetooth Low Energy, a user always comes to the delima, "Is Bluetooth Low Energy the correct protocol for me?", what if somebody sniffs the packet transferred over Bluetooth Low Energy and gets an access to all the information.

To address such concerns, Bluetooth Low Energy protocol provides various levels of security features such a MITM protection, etc. With MITM, there is still 1 in a million chance that a hacker may get access to all the informaiton. To address such concerns, Bluetooth Low Energy protocl provides a feature called Out-of-Band (OOB) Pairing. In this mode of pairing, instead of sharing the secret keys over the 2.4 GHz band used by the Bluetooth Low Energy protocol, it makes use of other mediums such as the Near Field Communication (NFC). Once, the secret keys are exchanged it then encrypts the channel to ensure the highest level of security.

Today's example of 100 Projects series, demonstrates the OOB pairing between two PSoC 4 BLE devices using the NFC communication. In this example for demonstrating the OOB pairing, a simple static handover technique is used. In this technique, the connection information including the security key is statically stored in an NFC tag. This demo intends to show how to use OOB APIs in PSoC4 BLE. Therefore, an end-application should implement as per the guidelines from the Bluetooth spec.

You can download this PSoC Creator project along with the custom app and a detailed project documentation, here from GitHub: https://github.com/cypresssemiconductorco/PSoC-4-BLE/tree/master/100_Projects_in_100_Days/Day032_OOB_Pairing

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The only available bonding (pairing) method in Core Bluetooth is passkey entry. The Apple Watch uses an OOB technique involving an image captured by the phone's camera with a fallback to passkey, but this is not available to other apps. If your device has a display and can generate a random passkey. Cristiano Ronaldo House

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