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The BLE-Stack OAD Profile does not implement or perform any security or authentication mechanisms as part of the firmware update process. System developers should take measures to adequately authenticate peer devices and only accept and/or apply firmware images transferred from trusted sources via the OAD Profile. TI recommends applications use Bluetooth LE Secure Connections (LESC) with Man-in-the-Middle (MITM) protection with peer devices when performing wireless firmware updates, although the use of the LESC feature does not itself guarantee image authenticity.
When using the Secure OAD feature along with recommended parameters, firmware images are authenticated on the device using ECDSA signature validation algorithms to ensure image authenticity prior to updating the running firmware image. Just as with the OAD Profile, TI recommends applications use Bluetooth LE Secure Connections with Man-in-the-Middle (MITM) protection with peer devices when performing wireless firmware updates.
