system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do remote car unlocks only unlock one car in the entire world?

Wouldn't there eventually be a remote that happens to unlock a random other car?  How can each remote specifically target a single car?  It seems like there would have to be some crossing of signals.
gpt
It is not the spectrum of the signal that opens the car.  It is presumably a large encrypted string that is exchanged with the computer in your car.  As long as you use a big enough string there is no reason to ever repeat.