RFID Secure Wallet




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.

Step 1: Materials

You will need:
-Aluminum Foil
-Double sided Scotch(or similar brand) tape
-Packaging tape(optional)

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!

Step 5: Make the ID Holder

-Fold a piece of packaging tape in half, sticky side in.
-Trim it so it fits on the left side of the wallet.
-Tape it in with small pieces of ducktape.

Step 6: Finishing

-Fold the wallet the way you would to put it in your pocket and place it under some books. Leave it there overnight.

All we have to do is test it!

Step 7: Testing

-Take your cellphone and place it in the wallet and call it while holding the top of the wallet closed.
If it doesn't ring the wallet probably works!




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    95 Discussions


    5 years ago on Introduction

    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.

    1 reply
    Conor Mbigbadsteve

    Reply 2 years ago

    I have made many of these wallets to sell and none have fallen apart even after years of use

    ro li

    5 years ago on Introduction

    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?

    1 reply
    Conor Mro li

    Reply 2 years ago

    No there is no efficient way to do it, as long as you manage to cover all the sides with the foil, it will be RFID proof.


    3 years ago

    First and foremost, does your credit card actually have an RFID
    transmitter? The vast majority does not. Have you ever been told you can
    hold up your credit card to a wireless payment terminal, and without
    inserting your card, pay for something? For most of my friends, and the
    world in general, the answer is no.

    So why u r weasting time for an aluminium foil,..

    1 reply

    Reply 2 years ago

    The cards that do not will expire. Then the replacements will have the chip.


    Reply 3 years ago

    8 years ago, you're no longer a kid and probably have a chemistry degree by now. Lol.


    Reply 3 years ago

    I still find it difficult to explain to people how magnets work. Im in my third year of electrical engineering courses.

    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.

    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


    4 years ago on Introduction

    Much better than DUCT tape and aluminum foil:

    HVAC Foil Tape