![]() When you go through an Oyster turnstile and touch it to the reader, a digital conversation ensues which decrements the credit on your card. Each card stores digitally encrypted information about its unique number and the amount of credit it holds. The system uses an RFID (radio frequency identification) chip which activates when the card, and its chip, come close to a reader - in effect, the chip's aerial resonates to the frequency put out by the reader, and the two can swap data. Around 80% of all Underground and bus payments in London are now by Oyster card. Oyster is very important for TfL: more than 10m Oyster cards have been issued and 38m journeys are made each week using Oyster. "The most anyone could gain from a rogue card is one day's travel." ![]() "We run daily tests for cloned or fraudulent cards and any found would be stopped within 24 hours of being discovered," it said in a statement. Transport for London, however, is apparently unworried. ![]() "These are things that should not be possible, not even with a single card." He was unsure how easy criminals might find it to copy his work. ![]() How important is the flaw? "Very serious," says Jacobs. ![]()
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February 2023
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