The tiny chip that powers Montreal subway tickets
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Re: The tiny chip that powers Montreal subway tickets
#2Author here for all your NFC chip questions :-)
Re: The tiny chip that powers Montreal subway tickets
#3This wasn’t super obvious to me until later in the article but this is about the single use tickets.
Neat stuff, though I can’t say I love the concept of e-waste NFC.
Re: The tiny chip that powers Montreal subway tickets
#4Author here for all your NFC chip questions :-)
How difficult is it to clone MIFARE Ultralight EV1 chips? You mention the UID is signed, can you simply copy this signature? Do you just need to buy one of the magical chips of the same design, that allow uid/serials to be written?
What is the actual mechanism behind the DESFire and other secure NFC chips that prevents cloning?
Re: The tiny chip that powers Montreal subway tickets
#5So how much more powerful is this chip than the ones NASA used in the the Apollo program?
Re: The tiny chip that powers Montreal subway tickets
#6Author here for all your NFC chip questions :-)
Is this the same system used by Boston MBTA? I was surprised to see single-use tap cards when I visited there for the first time yesterday. I wondered why the ticket isn't reloadable.
Re: The tiny chip that powers Montreal subway tickets
#7[flagged]
Re: The tiny chip that powers Montreal subway tickets
#8Author here for all your NFC chip questions :-)
Is this the same system used by Boston MBTA? I was surprised to see single-use tap cards when I visited there for the first time yesterday. I wondered why the ticket isn't reloadable.
Most people who live in Boston use the reloadable CharlieCard (https://www.mbta.com/fares/charliecard) - these report as Mifare Classic 1k, which is a similar chip
There are single-use fares as well, the "CharlieTicket" that you might've encountered.
More CharlieCard NFC info:
https://medium.com/@bobbyrsec/operation-charlie-hacking-the-...
https://media.defcon.org/DEF%20CON%2031/DEF%20CON%2031%20pre...
Re: The tiny chip that powers Montreal subway tickets
#9I would like a comprehensive analysis of FeliCa.
Re: The tiny chip that powers Montreal subway tickets
#10So how much more powerful is this chip than the ones NASA used in the the Apollo program?
I think this chip is implemented with a state machine rather than a processor, so it's meaningless to compare their processing power. The Apollo Guidance Computer had about 17,000 transistors, while I estimate that the NFC chip has about 45,000 transistors. So the NFC chip has more complexity, but the same order of magnitude.