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Re:Backdoor discovered in several brands of RFID cards [pdf] by minkles on Friday August 16, 2024 @05:30PM (#41270568)
Yeah TFL killed them off starting 2010 in London due to this. I'm surprised this is even a thing now.
Re:Backdoor discovered in several brands of RFID cards [pdf] by lxgr on Wednesday August 21, 2024 @05:48PM (#41314517)
Oyster has been using MIFARE DESfire, and stopped using MIFARE Classic, for over a decade now.

They're stopping it for completely unrelated reasons (primarily convenience – people don't like having to buy and top up a card – and not having to maintain a vending machine and top-up infrastructure).