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What's the point? You then have to fanny around taking the card out of the wallet every time you want to use it, in which case you may as well just stick it in the slot
You have to do that anyway don't you? My credit card, debit card and oyster card are all contactless - if they're next to each other in a wallet the readers just give an error as they normally pick up multiple signals.
Apart from the lack of a time machine, I'm sure it's a simple task.
Pah, I was there for the launch of the first time machine in 2053. I cloned in onto my nuclear powered hoverboard in seconds and I'm back here in 2016 to launch a new standard that is going to be big I tell you - can't say much at the moment, but something to do with b/b sizes 😉
I'm not concerned about skimming with POS terminals, but I am concerned about fraudsters ripping and emulating other people's cards.
I did some research a few months ago in an attempt to emulate my work card using my phone. I found that was impossible, but stumbled across an app which allowed you to clone cards. You had to use two networked phones to get/send data from the two way system. It would look like you were paying with Apple pay but instead could be using someone's stored card data. IIRC you could also 'bridge' a card between two phones, so have one phone near a victims card, and use the other phone to pay using that card at a POS terminal.
Thankfully banks are good at spotting fraudulent transactions, and the amounts are relatively small.
I'm guessing you're referring to https://sourceforge.net/projects/nfcproxy/ - which I found when doing a bit of research last night. It appears totally feasible to use two phones as a proxy in the way they're suggesting, though I'm not sure whether recording and replaying the transactions (which is effectively how they're storing the card data) is a useful means of theft - anybody who knows more care to comment?