I'm assuming automakers don't publish their specs for keyless entry for review? I'm sure they are relatively insecure, and they almost surely have backdoor code

I'm assuming automakers don't publish their specs for keyless entry for review? I'm sure they are relatively insecure, and they almost surely have backdoor codes known to thousands of individuals in each company and likely to several law enforcement agencies as well. Such info will inevitably be leaked. I'm honestly surprised we haven't already seen widespread hacking of keyless entry. Now that many cars do all their user authentication to wireless keyfobs, hotwiring's not even necessary if you can crack the protocol.