RFID credit cards are designed for short-range operation (1 centimeter), and radio fields drop off with the square of the distance. Even as close as 1 meter you're talking about a field 10.000 times weaker. That also means a reader can protect the card being read by adding a low-power jamming signal at 10 centimeters from the reader. Even at low power, it would overpower the passive RFID card everywhere but in the proximity of the reader itself. And that's without a feedback circuit from the jammer to the reader. –
Can there be a small battery powered unit developed to place in a wallet or purse to jam the signal?
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