Secure Bootloader

The Secure Bootloader example uses the Bootloader and DFU modules to implement a bootloader with secure Device Firmware Update (DFU) functionality.

The example bootloader accepts images that contain a new bootloader, SoftDevice, application, or any combination of these. To protect the target device against malicious attackers trying to impersonate the rightful sender of the firmware update, the init packet of the firmware package must be signed.

Secure bootloader is supported with various DFU transports:

• BLE Secure DFU Bootloader
• Secure DFU Bootloader over Serial Link (UART/USB)