We took a hacker to a café and, in 20 minutes, he knew where everyone else was born, what schools they attended, and the last five things they googled.
By Maurits Martijn, from De Correspondent
In his backpack, Wouter Slotboom, 34, carries around a small black device, slightly larger than a pack of cigarettes, with an antenna on it. I meet Wouter by chance at a random cafe in the center of Amsterdam. It is a sunny day and almost all the tables are occupied. Some people talk, others are working on their laptops or playing with their smartphones.
Wouter removes his laptop from his backpack, puts the black device on the table, and hides it under a menu. A waitress passes by and we ask for two coffees and the password for the WiFi network. Meanwhile, Wouter switches on his laptop and device, launches some programs, and soon the screen starts to fill with green text lines. It gradually becomes clear that Wouter’s device is connecting to the laptops, smartphones, and tablets of cafe visitors.
On his screen, phrases like “iPhone Joris” and “Simone’s MacBook” start to appear. The device’s antenna is intercepting the signals that are being sent from the laptops, smartphones, and tablets around us.
More text starts to appear on the screen. We are able to see which WiFi networks the devices were previously connected to. Sometimes the names of the networks are composed of mostly numbers and random letters, making it hard to trace them to a definite location, but more often than not, these WiFi networks give away the place they belong to.
By Maurits Martijn, from De CorrespondentTranslated from Dutch by Jona MeijersIllustrations by Kristina Collantes In his backpack, Wouter Slotboom, 34, carries around a small black device, slightly…