Radio-frequency identification tags label all kinds of inventoried goods and speed commuters through toll plazas. Now tiny RFID components are being developed with a rather different aim: thwarting counterfeiters
More than 22 million visitors attended the Expo 2005 World's Fair in Aichi, Japan. Not one got in with a bogus ticket. The passes were practically impossible to forge because each harbored a tiny RFID (radio-frequency identification) chip - just 0.4 millimeter (mm) on a side and 0.06 mm thick - that transmitted a unique identification number via radio waves to a scanner at the gates.