On Fri, Oct 7, 2022 at 3:34 PM Rich Pieri <[email protected]> wrote:
> In order > for a Faraday cage to work it needs to fully enclose the object. No > wallet that permits access to the contents will do this. In other > words, if the auto shop's RFID system really did read your AMEX card, > no Faraday wallet would have stopped it when you opened it to get your > Correct, if it's a steel wallet holding all the cards in a single cage. > One is to have Visa and AMEX issue you new cards that do not have RFID > chips in them. No RFID means they can't be read at any distance. > That's why he asked about SLEEVES, one per card. (Or at most 2, back to back, only take out one) Sleeves may not be a perfect cage, not having a TEMPEST grade closure, but even a poor Faraday cage may add just enough dB attenuation that the extreme range RFID/NearField/whatever doesn't pick up the card in the sleeve in the wallet. Another option besides asking AMEX for a non RFID/NC card is asking AMEX to decline RFID charges, IDK if that is possible but something to consider and if enough of us ask, maybe they'll let us put a 2 Latté limit on RFID purchases or something. -- Bill Ricker [email protected] https://www.linkedin.com/in/n1vux _______________________________________________ Discuss mailing list [email protected] http://lists.blu.org/mailman/listinfo/discuss
