The ExpressPay from American Express has no pin. just wave it in front of reader and off you go.
And to correct you, it's probably challenge-response system just like they had on the previous blue (smartcard). Whilst the security of the transaction is quite high, depending on implementation, it could have vulnerability beyond theoretical security. that is why there is a lot of concerns because people could be attacking you without your realizing.
But like I said, this system requires no ID or no signature. it's not very comforting to know that if physically stolen, they won't hindered in using it.
The device is aimed at gamers and TV watchers, generating a 3D image with use of a pair of 0.7-inch OLED panels, which each display separate images, doing away with the ghost imagery that often comes along with 3D displays.
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Adrian,
The ExpressPay from American Express has no pin. just wave it in front of reader and off you go.
And to correct you, it's probably challenge-response system just like they had on the previous blue (smartcard). Whilst the security of the transaction is quite high, depending on implementation, it could have vulnerability beyond theoretical security. that is why there is a lot of concerns because people could be attacking you without your realizing.
But like I said, this system requires no ID or no signature. it's not very comforting to know that if physically stolen, they won't hindered in using it.
https://www124.americanexpress.com/cards/loyalty.do?page=blue.expresspay.learnmore
if you read the literature, you'll see that they market it as absolute no hassle payment. this means no hassle for pick pockets as well.