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Is RFID talk valid?

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I noticed an ad on a site for blocking RFID radio waves to prevent identity theft. Normally I would have passed this off as tin foil stuff, but I remember a thread a while back covering the concept of an RFID card and how it could be abused.

But apparently not. What is the deal, any peeps know?
 
So RFID would have this problem:
It can be used to trigger a bomb when a certain number of return signals are detected... It's been proven by a few security firms, i believe.

I dont get why it HAS to be touchless, they could just make a 2D barcode to replace the old barcode standard. Big advantage: downwards compatible, just printed on paper o need to change older equipment to produce. Passport Canada is using just that for their online passport applications. As you fill in the form, it produces the 2d barcode, which you then print and bring with you at the passport office with pictures and other documents. Goes way faster this way.
 
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