Firmware update in a resource constrained environment

Abstract: An embedded system’s software is often the backbone for a successful prod- uct. To make the system stand out from the other competitors on the mar- ket, your system must be adaptive and ready for quick updates. However, one may never truly know where your system is going to be used and how difficult it can be to access and update it. Here we show a solution that securely updates a system based upon a lower layer Bluetooth connection. We found a way to update a system that has constrained memory resources using RSA keys for verifying the validity of the firmware. Furthermore, we found that our solution did not meet the memory restrictions but there are ways to improve the solution so that these restrictions are met. The findings of this report can be a used as a reference for further de- velopment of wireless firmware updates using digital signatures in resource constrained environments.