[derekp7]

I usually swipe my card while items are still being scanned. Most card readers allow this. Would this not be possible with a chip card reader? i.e., does it use a private key on the card to sign the whole transaction (including final dollar amount)?

[jacobr]

In Sweden, I 1) insert my card, 2) enter my pin, 3) pack bags while waiting for total, card left in card reader, 4) accept

[aianus]

I would assume it does. Here in Canada I have to approve the total before it asks for my PIN.

[willvarfar]

On the screen of a terminal that may be tampered or bogus, you mean?

[aianus]

No, on legitimate ones. You put the chip in the reader, it tells you the total amount, you hit OK, then it asks for your PIN, then the transaction goes through, then you take the card out of the reader. I don't think there's any way to pay before the reader knows the final amount.