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Two students find security bug that could let millions do laundry for free
(www.theverge.com)
This is a most excellent place for technology news and articles.
Oh yeah, that's true, so you wouldn't have destroyed the card, but it's not a useful hack if they've done even the most basic security measures.
That said, I would be fascinated to know what was on that card. I'd give it pretty good odds of having absolutely no security measures whatsoever.