Another idea for using RFID, reported by BBC News:
A leading professor at the Massachusetts Institute of Technology has suggested using radio [RFID] tags in credit cards as a kind of virtual signature.Professor Ted Selker said the way someone moved their finger over the card would alter the radio transmission, producing a signal unique to that person....
"By watching a finger moving around an antenna, we can literally see that the finger changes the antenna's behaviour," he told BBC News Online.
"I could draw letters and it would tell just by where my finger is how that is affecting the radio signal, whether or not it was me."
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