Security is paramount when it comes to bank cards.
One issue currently facing contactless cards is the relative ease with which thieves can copy data and make charges to tap and pay cards cards.
Contactless cards are read using electromagnetic fields and at present theives can use this fact to read them using portable scanners which can be picked up relatively cheaply.
A team at the University of Pittsburg has developed a way for contactless cards to be automatically turned off when not being held for a transaction.
This makes the cards unreadable by potential theives.