I love your example..

> But if you don't know where the data came from then it's not secure.
> Consider a "real-life" example. Robin Hood steals the Sheriff's ATM card,
> and the Sheriff stupidly enough has written the PIN onto the back of the
> card. Now Robin can go and withdraw all the money from the Sheriff's
> account because the ATM has no way of knowing that the card was stolen (it
> doesn't know where the source of the data came from), all it knows is that
> the data is valid (right card, right PIN).

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