The device you can see being used to kill an unsuspecting flying bot is a ‘cyber rifle’, built by the US Army Cyber Institute.
The name is a little misleading as it’s not really a rifle: it’s a Raspberry Pi and a Wi-Fi antenna cobbled together, which takes advantage of a known security flaw with Parrot quadrotors to ‘shoot’ them down. The rifle shape, according to an interview with Popular Mechanics, is “mostly for kicks”.
— Army Cyber Institute (@ArmyCyberInst) October 12, 2015
The familiar shape is meant to make it easier for military brass to understand the tactical application of cyber-weapons. It’s not some overly complicated computer; it’s as simple as 'Aim. Shoot. Crash.' The utility isn’t limited to drones, either: the ACI also showed it turning off lights and opening the doors of a cute little bunker. [Popular Mechanics]