anybody hear of a DC metro (smartrip) smartcard failure/exploit?
you have a smartcard that supposedly has $10-something left ... and the next time you go to the station ... the turnstyle says "not acceptable, see stationmaster". the stationmaster puts the card in a reader and the display comes up and says the card has negative $5 balance. in theory, the transactions with the smartcard are encrypted (and possibly the values stored in the chip are also encrypted). somehow the card has had a failure/exploit that made it look like the card has a negative $5 balance?
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