The Universal Radio Hacker (URH) is a tool for analyzing unknown wireless protocols. With the rise of Internet of Things (IoT) such protocols often appear in the wild. Many IoT devices operate on frequencies like 433.92 MHz or 868.3 MHz and use proprietary protocols for communication. Reverse-engineering such protocols can be fascinating (»What does my fridge talk about?«) and reveal serious security leaks, e.g. when bypassing smart alarm systems and door locks.