Capture the Signal (CTS) is a challenge-based CTF that focuses exclusively on the reverse engineering of radio signals. This activity is also known as “blind signal analysis” as the specifications of the signal are unknown to an attacker. This contest is organized by Trend Micro’s researchers for researchers, hackers, and practitioners in the field!
Contestants should use their RF-hacking kung-fu and tools like GNURadio, GQRX, URH, Python, C, anything, to examine a series of increasingly complex radio signals to extract key information leading them to the next signal.
The game runs virtual. The radio signals will be distributed over IP. The use of IP eliminates the complexity of deploying actual radios and transmitting RF over the air.
GNURadio, for example, supports the tunneling of signals natively (ZeroMQ), so the entry barrier is fairly low and the players could focus on the real challenge. For the same reason, we may provide VMs to support the GNURadio toolchain, as setting it up can be a time consuming process and is not relevant to the core of the challenge. Of course, participants are welcome in using their own setup.
The more challenges you solve, the more points you gain. Points for challenges are statically assigned and are proportional to the difficulty of the challenge. The first participants to solve a challenge will receive a higher number of points.
At the end of the competition, the team with highest total points will be named the winner. In the case of two different teams having the same points, whichever team was quickest to reach this high score will be declared the champion.
We try hard to keep the competition as free and exciting as possible; however we do require teams to adhere to a few simple rules: