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Very cunning; an electro-magnetic pulse generator. Zap! - fizzle.
On the other hand you might want to protect your RFID if, for example, you need one to get into, or move around inside your workplace. You might also want to protect your toll-road RFID tokeniser - you'll need one on your car dashboard to drive through the toll-booth (deducting the toll from your account) on a new highway in your region not so far in the future. Aucklanders are going to know all about this in a year or two...
and Wellington in a decade or two! All recently issued passports have them - that bears thinking about.
Technology exists to enable some criminal to 'swipe' your RFID work security access card while it's in your wallet in a pocket (or swinging nerdily from a rope on your belt), replicate it and then gain unauthorised access to your workplace with a clone of your card. You need to protect yourself from this theft of your identity (as far as the front door to your workplace is concerned). There's an article about this somewhere in the Internet... I haven't got the link; you can Google it.
The solution is fairly simple - wrap your card in a Faraday cage. Inside a Faraday cage your card will be protected from unwanted probes by hackers and criminals. (You might want to put your cell phone in one, too... Of course then it would never ring or receive an SMS item; TXT, PXT, VXT, TBV, etc. And there might be circumstances where you want that kind of protection... if you are a spook, for instance.) But I digress...
Protect the RFIDs in your wallet. How? Cut a piece of kitchen aluminium foil the size and shape of your open wallet. One thickness is all you need. Take all the notes out of the zippered pocket in the back and carefully insert the foil being careful to tuck it right into the corners, along the bottom and side edges, and under the zip flap at the top. Replace the notes, zip, and you are finished!
Test it. It works... to a remarkable extent. Alright, it's a leaky Faraday cage.
I have done this nifty security mod to my wallet. Now, I can't get the door to beep and release when I point my arse in the general direction as I used to be able to. Now I have to get my wallet out of my back pocket and hold it still and hard against the reader, or that failing, open it up and expose the card briefly enough to be legitimately probed. Brilliant!
It slows me down a bit, but I have the peace of mind that my card is secure from unwanted probing... and Zapping for that matter.