The perfect clone: Researchers hack RFID smartcards

Professional safecrackers use a stethoscope to find the correct combination by listening to the clicks of the lock. Researchers have now demonstrated how to bypass the security mechanisms of a widely used contactless smartcard in a similar way. Employing so-called “Side-Channel Analysis” the researchers can break the cryptography of millions of cards that are used all around the world.

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Story added 9. March 2012, content source with full text you can find at link above.