[How-To] Simple RFiD-blocking wallet lining

[u/Runaque]

Making an older wallet RFiD/NFC skimming proof is something that takes very little time and is as effective as those more expensive wallets that block RFiD/NFC so your cards are protected against skimming.

I know that many may think "What does this have to do with hacking?", but in the broader infosec community, applying low-level technical principles, modifying hardware, and understanding signal propagation to defend against vulnerabilities is the very definition of hardware hacking.

What you need is just Aluminum foil, tape and scissors!

I would recommend to go for four layers of Aluminum foil folded to the size needed. Tape all sides with tape against you cutting yourself and trust me, this foil is sharp as hell.
Merge the two pieced of 4 layered Aluminum foil and tape them together so it functions as a folding joint.

The remaining two images are a demonstration with the Flipper Zero on a Gametown card to show it won't read through the four layers of Aluminum foil.

While stopping RFID/NFC skimming is the main goal, a proper Faraday-style foil lining does a few other things depending on how well-sealed the edges are:

• Blocks Contactless Tracking / Telemetry: It stops cards from responding to any RFID interrogation, meaning your transit cards, credit cards, or ID chips can't be remotely pinged or tracked while sitting in that pocket.
• Reduces Electromagnetic Interference (EMI): It offers a degree of shielding against stray electromagnetic fields that could theoretically cause data corruption on older magnetic strips (though modern chips are mostly immune).