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Program RFID cards as keyfob replacements

I was just wondering if anyone has experimented with programming RFID keycards as a keyfob replacement.
I'm sharing a Tesla with a couple of people and while the mobile app works great for unlocking etc ... I would love to figure out a way to use keycards just to unlock the doors.

So I guess my question is twofold:
- Is there a built RFID reader on the Tesla Model S
- Does anyone have any insights on how to come up with the right datastring to put on an RFID card that would send the correct OPEN command to the car ?

thanks

I was wondering something similar. It would be awesome if you could use the NFC in your phone for use with the car. Then I wouldn't even need to carry the key!

phat;
The thought gives me the "poaching" heebie-jeebies.

@phat78boy - I've been campaigning to include the fob functions in mobile app for six months. It's more more convenient, more secure (PIN protected), the battery won't need replacement unexpectedly (hey it's got a 60/85 kw-h battery!), and it's less likely to get lost or forgotten.

I know the mobile app currently used the phone's network connection, but others have mentioned that Bluetooth can handle all the necessary communication tasks, security and proximity issues. If for some chance I leave my phone unlocked in my car and it gets stolen, I go online and deactivate/wipe it and the car's dead. (TM might be able to do this with the fobs also)

Bring the fob along for valets, service appointments, etc. Other than that, it's a superfluous little gizmo. Those who don't want the smartphone route can still use their fob.

https://www.usenix.org/system/files/conference/usenixsecurity12/sec12-fi...

I got curious and started reading about hacking key fobs. I have no idea what Tesla is using but the above was an interesting read on the subject.


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