A luxury vehicle today contains multiple computers. During an hour's drive, it thus produces multiple gigabytes of data. Even less expensive vehicles are now brimming with information technology. The growing interconnection of the individual components opens dangerous security holes. One of these has now been closed by computer scientists at the Center for IT Security and Privacy (CISPA) and the German Research Center for Artificial Intelligence (DFKI) — with the help of software that manufacturers can retrofit into any car.