Past Tesletter articles
[Nerd post alert] Have you ever asked yourself how the NFC cards for the Model 3 actually work? This Reddit user has reversed-engineered his Tesla NFC card and discovered a bunch of information about it. First and most importantly, these cards are pretty secure; the other finding that I think is interesting is that the author believes he can use the Tesla key card to authenticate in other devices, like building access.
Read more: RedditFrom issue #84