Inside the Tiny Chip That Powers Montreal Subway Tickets

owl writes:

http://www.righto.com/2024/06/montreal-mifare-ultralight-nfc.html

To use the Montreal subway (the Metro), you tap a paper ticket against the turnstile and it opens. The ticket works through a system called NFC, but what's happening internally? How does the ticket work without a battery? How does it communicate with the turnstile? And how can it be so cheap that you can throw the ticket away after one use? To answer these questions, I opened up a ticket and examined the tiny chip inside.

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