" Researchers from Radboud University in the Netherlands have successfully cracked the security of the Oyster card used for fare payments on buses and tubes in London."
more here :
http://uk.news.yahoo.com/vdunet/20080623/ttc-researchers-crack-oyster-card-securi-6315470.html


I never got an oyster card when I was over. I bought subway tickets or tube tickets and had a rail pass.
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