Instructables

RFID Secure Wallet

Picture of RFID Secure Wallet
TinFoilHatArea.jpg
RFID has been used in stores and cars as a identification system for years. They seem to make life in general more efficient.

With RFID tags in Credit Cards, Passports, and drivers licenses coming out I started to worry. Soon there will be RFID tags in money. I guess that would help solve some of the poverty problems. RFID tags are also not very secure. When the first RFID passports came out in the UK the encryption on the chips was broken in under 48 hours!

RFID blocking wallets are for sale for ~$20 (http://www.difrwear.com/products.shtml). However these are a little unstylish(yes I know its not a word) and pricey for me.

So here I will show you how to make a RFID shielded wallet that doubles as a waterproof, tear proof, cool looking ducktape wallet, without spending a fortune.

We will use Aluminum foil as a to block the radio waves that power the RFID, like a faraday cage.
 
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Step 2: Make the Base

-Make 2 sheets of ducktape that are 19.5cmx16cm, sticky side up, by overlapping the strips of ducktape as shown.
-Cut 2 pieces of 17.5cmx14cm aluminum foil. Place them on each sheet of ducktape.
-Put 3 strips of double sided tape on one of the sheets of aluminum foil/ducktape.
-Put the two sheets together like a sandwitch sticky side in.
-Trim it so it looks good.
Your done with the base!

Step 3: Make the Money Pocket

-Fold the base in half like a hot dog (see picture) leaving about a centimeter of no overlap at the top.
-Tape the sides

Your done with the money pocket. Now we will add the change holder and the ID.

Step 4: Change Holder

-Take 2 pieces of ducktape one slight bigger than the other and place them together, sticky side in. The smaller one should be equal in size to half the wallet lengthwise.
-Take this a place it on the left side of your wallet.

Now for the ID holder!
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ro li6 months ago

hopefully i am not displaying my ignorance of physics and manufacturing but is there any polarization effect if you rotate the pieces of foil - will this increase the efficacy or is this just a waste of foil?

bigbadsteve7 months ago
An OK idea for the seriously broke or cheap. However the downside of using any tape, inc. duct tape (not 'duck', mercy on our billed cousins!) for a permanent 'fix' is that after a while the glue comes off and leaves very hard to remove deposits on whatever it touches (inside your back pocket in this case). I know this from sad experience. Better off buying a purpose-made shielding wallet, card pouches, or in-wallet RFID jammer such as ArmourCard.
I recently did some research on this as my wife got skimmed, I found this cool product made in Australia called Armourcard, it jams RFID signals and fits in a wallet. Pretty cool we both have one now. http://www.armourcard.com.au/
bdl7 years ago
Could you also use the shiny metallic covers that come with some CDs? Are these RFID proof or just anti-magnetic proof-type thingy ??????
dogsrcool2me (author)  bdl7 years ago
could you explain these covers in more detail?
RFID = magnetism. light is magnetism, radio waves, microwaves, X-rays.... pretty much any "wave" is magnetism. so yes, tinfoil will stop any of those.
lets just say i have this super powerful light will it pull itself to my refrigerator?
probably not, its a frequency, not a steady stream like a fridge magnet is. anyhow, if you where to get that powerful of a light, you would burn stuff up with it.
No offense, but do you have any idea what your talking about?
somewhat. I'm not a pro. I'm speaking from my experience, and from what I've read about physics.
Which is all that guys with PhD's have done - read a lot, lots of experience (experiments) and then convinced other people with PhD's that they know it.

Question: Who had the first degree? Who gave it to him? What were THEIR qualifications? Did that mean that their graduate was more qualified than them? hmm, interesting....
The electric wave from the electromagnetic field would induce a current in a conductive material. This current would cause the conductive material to become magnetic by aligning the magnetic domains. However, fridge material is probably not conductive at the frequency of light. again "MAGNETISM IS NOT ELECTROMAGNETISM" Electromagnetism is were a changing magnetic wave that produces a electric field that then produces an magnetic field. A permanent magnet only produces an unchanging magnetic field.
true, but you can move a permanent magnet to produce a changing field. ever see those flashlights you shake to charge?
thats because the magnet disturbs the atomic particles in the wire causing electrons(or protons cant remember which) to flow in the wire generating electricity which then powers the light. Just read up on generators and how they work
Electrons. Protons have a positive charge.
And that's "subatomic" particles.
which are made up of quarks and gluons. :)
Correct.
not atoll im just a kid who likes explosives with a passion for science
your the same as me
lol thanks for clearing that up
Light is a particle, not a wave. how else would they make laser pointers or cut things with lasers?
Qoute"electromagnetism DOES NOT = MAGNITISM"end qoute.
dogsrcool2me (author)  glitcher6 years ago
light is both a particle and a wave It has aspects of both
god i cant wait until what is it physics? im just dying to understand all of it!!!! (really!)
dogsrcool2me (author)  conrad24686 years ago
see post above
No, RFID = electromagnetic waves light is electromagnetism, radio waves, microwaves, X-rays.... pretty much any "wave" is electromagnetism. so yes, tinfoil may spot alot of these, It depends on the electron configuration.

electromagnetism DOES NOT = MAGNITISM
Absolutely right!

Prove it to yourself - get a magnet and wrap it in aluminum foil. Try to pick up something with the magnet. Did it still work?

Aluminum foil will block RF, but not magnetism.
RFID = magnetism. light is magnetism, radio waves, microwaves, X-rays.... pretty much any "wave" is magnetism. so yes, tinfoil will stop any of those.
so i wrap up my mobile phone in tin foil it would block out all radio waves to and from it?
ummm could i just put a piece of tin foil instead of making one of these?
yes,
yes! thanks
iBurn6 years ago
couldn't you just line your wallet with a brass mesh? Or would that be too expensive?
It's called AlFoil. Cheap, suitable, able to shape into a helmet XD. Not sure about brass but aluminum foil is well known on instructables for blocking/boosting signals. Also, you can get Aluminium foil/tape which may be more convenient. Nice instructable *Votes*
Quotes self: *Votes* Not in a competition >_< soz to get ur hopes up.
...also very easy to form into a tinfoil hat!
Snappy833 years ago
Thanks for the info about RFID! Its awsome people like you that share good info that most people need to know about :) cheers!
andi4564 years ago
They already have RFIDs in money. Its those magnetic strips in them.
dombeef andi4563 years ago
That is not rfid
fox645 years ago
"Probably works" ... nice. Going to Defcon this year, gonna have to make these. Nice job BTW! I would have loved to see you put more work into the design of the wallet, like the all of the other duct tape wallets out there.
http://www.i-hacked.com/content/view/208/48/

newby, your too late. plus the guy on I-hacked left some tin foil showing which is a plus over this
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