![]() ![]() Then, it will only save the code into memory if the signature check succeeded. The victim will receive data through a serial connection, decrypt the command, and confirm that the included signature is correct. This tutorial will work with a simple AES-256 bootloader. Users will not know the secret key or the signature tied to the firmware, so they won't be able to "fake" their own. Then, the bootloader can decrypt the incoming firmware and confirm that the incoming firmware is correctly signed. The company can add their own secret signature to the firmware code and encrypt it with a secret key. One way of stopping this is to add encryption. For example, this might be for protection reasons - hackers might be able to access parts of the device that weren't meant to be accessed. A company may want to stop their customers from writing their own firmware and uploading it onto the micro. There is one big security issue to worry about with bootloaders. Once the full firmware has been received, the micro can happily run its updated code. The bootloader receives information from a communication line (a USB port, serial port, ethernet port, WiFi connection, etc.) and stores this data into program memory. ![]() This is especially useful for devices with complex code that may need to be patched or otherwise updated in the future - a bootloader makes it possible for the user to upload a patched version of the firmware onto the micro. In the world of microcontrollers, a bootloader is a special piece of firmware that is made to let the user upload new programs into memory. 11 Appendix D: AES-256 13th Round Key Script.10 Appendix C: AES-256 14th Round Key Script.6.2.1 Resynchronizing Traces (XMEGA only).4.2.4 Communicating from CW-Capture Software.4.2.2 Communicating from CW-Capture Software.4.2 Programming the STM32F3 (CW303 Arm) Target.4.1.4 Communicating from CW-Capture Software.4.1.2 Communicating from CW-Capture Software.2.2 Building for CWLite with Arm Target.2.1 Building for CWLite with XMEGA Target. ![]()
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