In view of the Paris Olympics, 300 people are working discreetly to prepare the computer networks which will allow the real-time broadcast of images and results of the events. This nerve center is the subject of all attention: cyberattacks disrupted the 2008 Olympic Games in Beijing, notably through Operation Shady Rat, which damaged government data, and those in Rio in 2016, where the group of Russian hackers "Fancy Bears" had accessed the files of the World Anti-Doping Agency and released the private health data of 29 athletes, including Serena Williams.