[Cryptography] French credit card has time-varying PIN

[Rick Nakroshis]

On Mon, Oct 3, 2016 at 2:50 PM, Henry Baker <hbaker1 at pipeline.com> wrote:

>
> The three digits on the back of this card will change, every hour, for
> three years.
>
> And after they change, the previous three digits are essentially
> worthless, and that's a huge blow for criminals.
>


I was amused by these lines.  Changing a three digit code every hour
generates unique values for less than forty-two days, not three years.

To last for three years, they'll need to reuse each value on the order of
thirty-five times.  Nonetheless, it's a step in the right direction.


Rick
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