Home Garage and Automobile security

 Recent events in Sun City. Thefts from cars in driveways.

 Having your garage door closed with the cars inside helps - to a degree.
Most garages have a garage door opener. Keypad near garage door entry, or use of a remote control door opener carried in a car.  Your keypad has a 4 digit code  so a number between 0 and 9999. or 10,000 or so combinations to have a thief or bugler or home invader attempt go gain entry.
Not so for most garage door remote control openers!  Most have a shift register in the receiver attached to the opener inside the garage. So instead of programming a open code, trying that code, waiting for the receiver on the in garage opener to reset, a device can arrange the possible codes in a single string of codes, send that string as a serial signal and cycle thru all 10,000 combinations in about 8 seconds.
 or
That thief can capture the signal, then replay it after you've closed the door and driven away. Newer garage door openers use one time codes and other mitigations to prevent this vulnerability.
OR
with the recent rash of someone rummaging thru unlocked cars in the neighborhood, they can easily capture the remote garage door opener's code and/or signal to be used later. Might thus suggest changing the code after an occurrence.

 For automobiles with key less entry and/or start the capture and replay of the unlock code was a thing. Recent automobiles have mitigated this. We Always use the button on the car door handle to lock our car so no signal is broadcast.

 However a video played at a recent cyber security SIG meeting shows a surveillance camera capturing two individuals approaching a new Mercedes in a driveway. One stands by the car, the other gets close the the house and walks the exterior with a radio scanner in his hand. That scanner has a transmitter to relay a signal to the other person near the car. After a few seconds the car flashes lights to indicate it has been unlocked. He gets access to the car, gets into the drivers seat. The other person starts to run to the getaway car, but is stopped when the car thief indicates the car won't start. The person scanning the house goes back to the house, scans again, the car now starts and both drive away with the stolen car. So a cough drop metal tin on the bedside table to hold your keys while sleeping might be a good idea.   Why does the car not stop when out of range of the key fob? Safety - what is you're driving when the key fob runs out of battery? Of falls off the roof of the car wher it was placed "just for a second".