IoT Penetration Testing Cookbook

Working with GNU Radio

Now, in the previous cases, it was all about just looking at the frequency and analyzing it, however, not too deeply. What if we have an IoT device which is transmitting raw radio traffic and we want to understand what is going on behind-the-scenes and find out what data is it actually transmitting.

To do this, we will use a utility called GNU Radio-companion, which allows us to build radio blocks in order to process various radio signals. In this utility, you can select an input source (such as RTL-SDR source, Osmocom source, HackRF source, and signal generators) and apply radio blocks on it, and finally store the output in a raw wav file or plot it in a graph.

For this exercise, we are looking at a weather station ...