34C3: Using Your Car As Video Game Controller

Despite the presence of human drivers, modern cars are controlled by computers. In his talk at the Chaos Communication Congress [Guillaume Heilles] and [P1kachu] demonstrate the potential of taking control of a car’s computer. This of course leads to the natural conclusion of emulate an Xbox controller and using the car to play computer games.

His research was limited by the fact that the only cars they had access to were the daily drivers of different members of [P1kachu]’s family, which meant that all tinkering had to be strictly non-destructive. Despite this, they achieved impressive results and deliver a great introduction into reverse engineering.

[P1kachu] used a RasPi and an OBD-II adapter to access the car’s CAN bus and begins the presentation with a quick overview of the protocol. He then briefly touches on security measures that he ran into, which are optional and their implementation varies widely between manufacturers. His first attempt to access the CAN bus was successfully blocked by a challenge-response algorithm doing its work. His mother’s convertible however provided no such obstacles and gaining access allowed him to map the position of the steering wheel and pedals to a game controller, using the car to play video games.

After this, [Guillaume] steps in and walks us through the teardown of a gadget that plugs into the OBD-II port and claims to do amazing things for your car’s mileage by reprogramming the ECU. The device was not brand specific and after having seen the variations in the ways different manufacturers implement the protocol, [Guillaume] and [P1kachu] doubted that the gadget was capable of even holding the information required to modify every known implementation out there. Listening to the output of the device, along with a quick analysis of the circuit followed by decapping the single chip they found, showed that their doubt was justified. The lecture closes with an extended Q&A that adds more information on car hacking. Those that don’t have access to a car can instead tear down hot glue guns, doppler modules or antique calculators.

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