A group of Dutch researchers at Vrije Universiteit in Amsterdam, led by PhD student Melanie Rieback, is building RFID Guardian, a personal RFID firewall to allow individuals to monitor and control access to RFID tags. When it’s finished, RFID Guardian is intended to be a portable, battery-operated device incorporating an RFID reader that will tell users when new RFID tags appear (for example, when you buy a tagged item), when they’re being read, and who owns them.