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Your bank card can be read through your wallet.

A card reader held close to your pocket can read a contactless credit or debit card. You don’t have to take it out.

Known as RFID skimming

It only has to be close. No tap, no touch.

Under ₹5,000, a tap needs no PIN. RBI rule, since 1 Jan 2021

A Faraday shield blocks the reader’s signal.

Quiet. Until you choose to tap.

How it works

  1. 01 The reader sends out a radio field.

  2. 02 Your card uses it to reply.

  3. 03 A Faraday shield blocks the field. No reply.

Inside the shield

How a Faraday shield stops a read.

Contactless bank cards · ISO/IEC 14443 · 13.56 MHz

FIG. 1Plan · the card
85.6 mm 54 mm CHIP · NO BATTERY ANTENNA COIL
A coil and a chip. No battery.
FIG. 2Section A–A · no shield
A FEW CM B-FIELD · 13.56 MHz CHIP WAKES, REPLIES READER COIL
The reader’s field loops through the coil and powers the chip.
FIG. 3Section B–B · shielded
EDDY CURRENTS OPPOSING FIELD CHIP STAYS OFF CONDUCTIVE LAYER
Eddy currents in the layer push back against the field (Lenz’s law). The chip never wakes.
FIG. 4Detail C · skin depth
0 δ 2δ 3δ 4δ 37% 14% 5% FIELD FIELD STRENGTH DEPTH INTO METAL →
At 13.56 MHz, δ is 17.7 µm in copper and 22.2 µm in aluminium. Thin works.
FIG. 5Detail D · coverage
FULL COVER GAP FIELD STOPPED FIELD LEAKS IN
Gaps let the field in. Slide the card fully in.

The shield, engineered.

Sealed conductive layer · 85.6 × 54 mm · works on 13.56 MHz

FIG. 6LINQS RFID Blocking Card 2
85.6 mm 54 mm 1 2 3
  1. PVC face
  2. Conductive shielding layer, sealed inside
  3. PVC back
FIG. 7LINQS RFID Blocking Sleeve
FITS 85.6 × 54 mm 1 2
  1. Faraday-cage design, wraps both faces
  2. Open end

Pick your shield.