KeySweeper sniffing the keystrokes

KeySweeper is a stealth Arduino-based device, cloned to a USB wall charger that wirelessly sniffs and decrypts, log and reports back over GSM all keystrokes from any Microsoft wireless keyboard within the vicinity. Its developer has released instructions on how to build it online. The device, called the KeySweeper, comes as a working USB wall charger. However, it secretly monitors any Microsoft wireless keyboards within range and “passively sniffs, decrypts, logs and reports back” everything...