>Let the door controller start rate limiting (ignoring messages) after 10 bad attempts, and then only listen to one code per second. Congratulations. Everyone

>Let the door controller start rate limiting (ignoring messages) after 10 bad attempts, and then only listen to one code per second. Congratulations. Everyone is now potentially DDoS'ing everyone else's car, and all it takes is one a-hole with a gibberish screamer to lock everyone out of their cars within range. You have solved nothing, and in fact, made plain old keys the more attractive alternative. I swear, people want to throw cryptography, radios, and security buzzwords at everything, but completely forget that the easiest way into the car will be taken. The tumbler lock. Once in there, hoods can be popped. Replace brain box. Move right along.