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I still wouldn't use a modified MTA card - cameras are pointed at every turnstile, and swipes could be logged with card id/money left on card. From a master log

• ashu 18y ago
  who said all this was done to actually use the hacked cards? :)
  • william42 18y ago
    Well if it wasn't then why would they be presenting it at DefCon?
• krschultz 18y ago
  There is no id on the cards, I pay for cash with mine every time, how are they going to know? I usually put $60-100 on mine each time, if I just kept refilling it at home how would they know? Sure they will notice a guy with a $50,000 card, but if you just update it to a modest amount every day they would never notice.
  • andreyf 18y ago
    In their slides, the first bits are an unique id (it's also printed on my MTA card (from NYC) under the date). This doesn't make you personally identifiable if you paid cash for the card, but it's an unique to the card, so discrepancies could be caught pretty easily.
    • eru 18y ago
      So how about choosing a new ID every time you update your card?