The author shares their journey of successfully reverse engineering and replaying a car’s key fob signal using an RTL-SDR dongle. They explain the basics of radio frequency, modulation, and bandwidth, emphasizing the importance of the hardware and software tools used for analysis. By using the Universal Radio Hacker software, the author decodes and analyzes the signal, identifying the rolling code system used for keyless entry systems. They uncover the structure of the signal, identifying the command, counter, and checksum within the packets. The author’s detailed analysis showcases their successful reverse engineering of a car key fob signal.
https://0x44.cc/radio/2024/03/13/reversing-a-car-key-fob-signal.html