I was planning on getting an Oyster card to use while I am in London beginning of August. Apparently someone has cracked the oyster card security :roll:

" 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