Secure USB Flasher for STM32

Secure USB Flasher for STM32, Germany

A module for reflashing a device via USB with encryption and authentication, developed from September 2019 to March 2020 for STM32. Programmed in C language using FreeRtos

Goals

The primary objective was to create a robust and secure module enabling USB-based reprogramming of STM32 devices. The system aimed to ensure the integrity and confidentiality of firmware updates by employing AES encryption. Additionally, RSA keys were implemented for user authentication, contributing to enhanced security during the reflashing process.

Develop a secure method for device firmware updates.
Implement USB-based reflashing for user convenience.
Ensure the confidentiality of transmitted firmware through AES encryption.
Establish user authentication using RSA keys.
Enhance overall device security during the reprogramming process.

Solutions

STM32 Platform Integration

Developing the module on the STM32 platform for compatibility and efficiency

FreeRtos Operating System

Implementing FreeRtos for real-time task execution during the reprogramming process

USB Reflashing

Enabling firmware updates through a user-friendly USB interface

AES Encryption

Transmitting firmware updates in an encrypted form to maintain confidentiality

RSA Key Authentication

Prior user authentication using RSA keys to ensure secure device access

DMA for Efficient Data Transfer

Implementing Direct Memory Access for streamlined data transfer

Project Results

A secure method of firmware upgrade via USB for STM32 is created. AES encryption and RSA authentication ensure privacy and security

Secure Firmware Updates

Achieved a secure method for updating device firmware through USB

User-Friendly Reflashing

Convenient USB interface for user-initiated device reprogramming

AES-Encrypted Transmission

Confidentiality of transmitted firmware updates ensured through AES encryption

RSA Key Authentication Success

Established a secure authentication process using RSA keys

Efficient Data Transfer

Utilized DMA for optimized and efficient data transfer during reprogramming

Enhanced Device Security

Improved overall device security during the reprogramming process

Successful STM32 Integration

Module seamlessly integrated with the STM32 platform

FreeRtos Task Execution

Real-time task execution provided reliability during firmware updates

Compliance with Security Standards

Met industry standards for secure device reprogramming

User-Verified Encryption

Users can verify the encryption authenticity through the implemented RSA key authentication

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