How do car keys open car doors?
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I assume you are asking about the remote locking feature, and not the actually key and keyhole, which works kinda like any other door key. When you push the button on your key, it transmits a code over a short range radio. A receiver in your car is listening out for this radio frequency, and if it gets the right code it tells the car to lock or unlock itself. Now, if your key and car used the same code every time, it wouldn’t be terribly hard for someone who knows a thing or two about radios and computers to intercept the transmission, copy the code, and then use it to break into your car when you leave. To combat this, the key and your car have a really long list of access codes. The key always sends the next code in the list, and every time your car sees a code it recognizes, it locks/unlocks, and then “crosses that code out,” so to speak. Now anyone who intercepted that code won’t be able to do anything with it.
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