Implementation and Security Assessment of a Wireless Sensor Network

Bluetooth Mesh may be a future alternative to Wi-Fi and Zigbee mesh networks in the Internet of Things market. It is based on Bluetooth Low Energy and extends it with additional security features. However, Bluetooth Low Energy has shown some vulnerabilities in the past. The goal of this work is to evaluate the security of Bluetooth Mesh networks. This thesis aims to identify weaknesses in the Bluetooth Mesh specification by analyzing the protocol and separating it from Bluetooth Low Energy. This work also includes a description on how to implement a mesh network with Zephyr OS and the Meshctl tool of the Linux Bluetooth stack as well as a setup for a Bluetooth sniffer. As hardware components we used several Nordic Development Boards and a Raspberry Pi 3. The result of this work is the proposal of theoretical attack vectors. These can be used for future attack implementations.