Let’s take look at a modern credit card and the nifty electronics it contains. Modern credit cards contains a micro-controller that is connected to the credit card chip contacts and on cards with wireless payment also to an antenna coil inside the card. On the surface the chip inside a card is a typical micro controller, but as one looks closer all sorts of security features become apparent.
Here are some videos on credit cards and other cards technology – both contact and contact-less cards. Learn how your contactless bank card works,
CONTACTLESS TRANSIT CARD TEARDOWN (single-use transit card which allowed the user to “tap in” to board a bus)
There are credit card stay safe devices marketed. Simplest are wallets that have metal in them that stops RFID signals and then there are different kind of RF signal blockers. Here are nowadays RFID Card Blocking device that you can put wallet to protect anyone nearby (with suitable hardware) to read your card so you don’t have to go out and buy a new RFID blocking wallet or purse. Just one RFID blocking card will protect two bank cards, on either side of it. The idea in them is to block unwanted RFID reader activity with RFID card blocker protection to prevent credit card fraud.
An active RFID jammer card works by detecting an incoming signal and then throwing up a scrambling signal like a porcupine. From my research there are differences how well jammers work – some work well and some not that well
Credit card size Anti RFID hacking RFID blocker protects the data on your debit cards and credit cards tap-and-go contactless payments cards from being stolen by digital pickpockets. Here is videos on testing RFID Card Blocking device for any wallet.
Want even more information what’s inside the ArmourCard active RFID jammer for NFC contactless credit cards? Does it work? Will it protect you from skimming?
So visit forum: https://www.eevblog.com/forum/blog/eevblog-890-armourcard-active-rfid-jamming-teardown/
Lithium Battery: http://www.gmbattery.com/dl/cp4/CP/CP142828.pdf