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And how that will protect you from repeater attack? I just steal your car while you are in mall with this just as easy, encryption or not. I don't care about the signal, just that I capture it, send it to my other device near your car and kaboom!, your car unlocked.

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The key fob would always return a response the exact same amount of time after receiving the challenge, so couldn't the car learn the distance by measuring the time of flight?

How does repeating work if both the car and key use a code that changes every time, like 2FA app.

TOTP relies on synchronized clocks, which is far, far too complicated to work here.

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