The other day I bought something in an Apple store. They used an iPhone with a special case that included a barcode scanner as cash register. When I gave the cashier my PIN-and-chip debit card, she inserted it in the card reader slot of the case. She then handed the phone over to me to approve the transaction. For a moment I was afraid I had to enter my PIN code on the iPhone screen (that would have been totally insecure). But she turned the phone upside down, which revealed a PIN pad and small LCD display on the back of the case. I was surprised, suspicious even, and wondered: was this really any more secure?

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