What is a Faraday cage in security?
D3 · Architecture · CompTIA Security+ SY0-701A Faraday cage is a conductive enclosure that blocks electromagnetic fields (EMF) — preventing radio waves, cellular signals, Wi-Fi, Bluetooth, and other wireless communications from entering or leaving the enclosed space.
Security uses:
📱 Shielded rooms (SCIFs — Sensitive Compartmented Information Facilities) for classified work
🔒 Evidence bags for seized devices (prevents remote wipe commands)
💳 RFID-blocking wallets (prevent card skimming)
🏭 Protecting ICS/SCADA from electromagnetic attacks
Security uses:
📱 Shielded rooms (SCIFs — Sensitive Compartmented Information Facilities) for classified work
🔒 Evidence bags for seized devices (prevents remote wipe commands)
💳 RFID-blocking wallets (prevent card skimming)
🏭 Protecting ICS/SCADA from electromagnetic attacks
Faraday cages are used in digital forensics — placing a seized phone in a Faraday bag prevents the owner from remotely wiping it before evidence can be extracted. SCIFs use Faraday shielding to prevent RF eavesdropping (TEMPEST protection). RFID-blocking wallets use the same principle.