Students at KTH have managed to hack drones, electric scooters and robot vacuum cleaners. In the clip above, KTH doctoral student Sotirios Katsikeas shows how to completely take over a robotic vacuum cleaner and use it to spy on people's homes.

- We can have live video on our mobile after we hack it, we can also record video so we can use it to spy on those in the room.

According to Pontus Johnson, professor at KTH, most digitized household items are far too complicated to be completely hack-proof. And many products are too poorly built to be protected from hacking at all.

"The best thing you can do is buy safe products, because if they are not well-built, then they are vulnerable," says Pontus Johnson.