I was looking into a remote start/fancy 2 way communication car alarm. I went over the options with the dealer that would install it. We talked about hood alarm, motion alarm, tilt alarm, shock alarm, etc. Basically different ways the alarm would monitor stuff to trigger it. Long story short I came to the realization that nothing could prevent someone with a tow truck from taking it away.
So, long story short I didnt get the alarm.
"However, the three men discovered that by tuning in to the wireless communication between the car and the transponder just twice, it was possible to narrow the number of potential combinations down to just 200,000.
Automated 'cracking' programmes could then try every one of those 200,000 codes in just half-an-hour."