OK - so you get the encryption and you discover what on the card you obtained to "crack"? This card good for $10? I noticed the articles don't say you found a way to actually take blank cards and actually encode them with non-authentic fares so that you could sell the cards on the street.
As several reviewers have noted - you end up with the fare amount and some number that identifies the card purchaser ONLY if you have access to the database. Does the encryption grant that to you? I should think not.
Also - for the actual practice of skimming the cards - how close would you have to be to actually get a legitimate read on the card in the possession of the owner? I bet you couldn't. Bet that you actually had to have physical possession before you could do anything with it.
Congrats on your 15 minutes of fame. The scare-mongering is not professional research or any "breakthroughs" of note.