Have you got your computer enclosed in a Faraday cage?
Researchers at Tel Aviv University and Israel's Technion research institute have developed a portable device, dubbed PITA, that can steal laptop encryption keys from 19 inches away.
The Portable Instrument for Trace Acquisition (PITA), built for less than $300, measures electromagnetic emissions from a PC using everyday electronics—a loop antenna, microSD card, Wi-Fi antenna, AA batteries, and a software defined radio (SDR) receiver.
An attack can be carried out using various setups. The gadget could connect via Wi-Fi for "real-time streaming of the digitized signal," or record signals onto an internal microSD card. "In both cases, signal analysis is done offline, on a workstation," researchers said.