How does TfL's Oyster card work? | Alphr
How does TfL's Oyster card work? | Alphr
Transport for London's travel card: "The new Oyster cards still have no battery or power source, so are only powered when they're near an RFID reader, but they contain their own operating system, have a file structure for storing files and data, and their processing functions allow them to perform encryption to the far more resilient AES 128-bit standard. Pretty clever stuff for something that looks like a credit card."
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