I understand that the ability to unlock or lock a car is based on the frequency of the transmission from the key, but hypothetically wouldn’t some of these eventually overlap and lead to someone being able to unlock someone else’s car?
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Authentication is not just based on the fundamental frequency of the transmission from the key.
You can continually vary the phase (shift the waveform around, basically) of the transmission frequency to transmit digital data wirelessly. At that point, your key can talk to your car, in much the same way that your phone can talk to wireless earbuds, or how your computer can talk (wired or wirelessly) to the internet.
Once you’ve got a digital communication line up and running, you can then set up pretty much any sort of digital password mechanism that you like.
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