Interesting content…see https://www.cbsnews.com/news/cars-hacked-stolen-keyless-vehi...
Probably a set of keys on a table just inside the door!
They need to add an accelerometer to these fobs. When no movement detector for x amount of time, fob goes into sleep mode, effectively turned off. No wake until it's moved again. Even a time interval as short as 60 seconds would be sufficient.
build a Faraday cage when you have your keys at home
Or just put in a metal box or case when not in use
That is what the article that I linked to says.
Experts say consumers don't have to install expensive after-market security systems to minimize the risk of being "carhacked." Other precautions can include storing keys in a metal container, signal-blocking pouch or "Faraday Box," to prevent relay attacks.
Something as simple as a decorative metal container may work. I use an old metal tea bag container. The way to test what you might have is to lock your car with the fob. Walk well away from the car, perhaps 50 feet, and place the fob into your container. Then approach the car with the closed container and attempt to open the door. It shouldn’t unlock.
What about just wrapping the fob in foil when at home?
This one from Amazon:
It clips to the key ring so it's always handy. It also keeps the keys from getting tangled up in my pocket.
It is all a matter of money and convenience. I would find the foil inconvenient. The decorative metal box I have, which the wife likes, is an old tea bag container. That works at home, but in a parking lot I have a Faraday pouch that gets left in the car. It isn't used every time, just in areas of high car theft in our area (shopping malls, movie theaters, etc). Police have reported that fobs are duplicated by gangs in parking lots, especially around the holidays.
If you chose to use foil, then test your method as I've outlined.
For giggles, I grabbed the nearest aluminum foil and wrapped the fob up on it. Even standing next to the car, it would not unlock. However, the attached house keys also had to be wrapped, else they act as a sort of antenna.
Our signal-emitting key fobs are hanging right inside our exterior door close to the car, so we do store the key fobs in these Todoxi Faraday pouches bdhsfz6 linked to to help prevent car theft. They work well. You don't even have to close the flap. If you don't want to take the pouch with you--it's a little bulky for a pocket--you can hang the pouch on a nail indoors and stick the fob in it with the flap open, and the signal is sufficiently blocked. I tested it by holding the open pouch with a fob right next to the car door, and the car does not respond as it would if I were holding the key fob outside the pouch.
Our key fob is in a cabinet in the room that is just on the other side of the garage wall. The cabinet is on the wall opposite of the garage wall I have tested it and neither our car nor truck will recognize the key fob there.
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