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Internet security device

Once upon a time there was a credit card with a special security device for use on the internet (or telephone). [I think Martin gave it some publicity.] The idea was that, to spare the user the worry that their credit card account number might be reused, the number was auto changed each time it was used.
This seems a jolly good idea - is it?
I can't find any card which still offers it - does any?
I would like such a card.

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