[larusso]

> Also, opening car doors isn't as simple as repeating a signal you captured(in general)

There are a lot of reports (I’m from Germany) from car brands selling cars in 2022 which can be opened easily by repeating/relaying the keyfob signal. Newer systems which also check the signal delay mitigate this. [1] the German ADAC (German Automobile Club) did a test with 500 cars. I was happy to learn that my new car is save from the simple repeat attack. [1] https://www.adac.de/rund-ums-fahrzeug/ausstattung-technik-zu...

[H8crilA]

I am to lazy to dig it up and link the PDF, but there was a whitepaper about the Volkswagen keyfobs. In terms of modulation it's unsurprisingly simple, on-off keying, nothing wrong with that. In terms of data transmitted they have several encrypted protocols/versions, but they all suffer from the same implementation problem: there is only one encryption key used for the entire global fleet of cars. Imagine making something as brutally broken as that :D

[galangalalgol]

Older systems that don't let the car interrogate the fob mitigate it as well as long as you have mutiple encryption keys. Looking at you vw.