Why put car keys in aluminum foil?

How to Properly Use Aluminum Foil to Protect Your Car Keys

If you’re concerned about the security of your keyless entry system, here’s how to use aluminum foil to protect your car keys:

1. Wrap the Fob Completely: Take a sheet of aluminum foil and wrap your key fob entirely. Be sure that no part of the fob is exposed, as the signal could still potentially get through small gaps.
2. Double Layering for Extra Protection: For added security, you can use two layers of aluminum foil to ensure a more robust signal block. Simply fold or overlap the foil for a thicker shield.
3. Use a Container: Alternatively, you can place your key fob in a small metal container, like a tin or a purpose-built Faraday pouch. Many people prefer this method for convenience and to avoid wrapping the fob each time.
4. Test It: After wrapping your key fob, test it by standing near your car. Try locking or unlocking the doors with the fob. If the signal is blocked, your car should not respond to the key fob while it’s wrapped in foil.

Are There Other Solutions to Keyless Car Theft?

While aluminum foil is a cheap and simple solution to prevent relay attacks, there are other options to consider as well:

1. Faraday Pouch: These are small, often fabric-lined bags that are designed to block signals, similar to aluminum foil. They are more convenient and less messy than wrapping your keys in foil, and they offer the same level of protection.
2. Turn Off Key Fob Signal: Some modern vehicles allow you to turn off the key fob’s signal when not in use. Check your car’s manual or consult the manufacturer to see if this is an option for your vehicle.
3. Store Keys in a Safe Place: When not using your key fob, store it in a metal drawer, a microwave, or a similar container. These objects will block the key fob’s signal and prevent theft.
4. Use a Steering Wheel Lock: In addition to securing your key fob, you can also use a physical steering wheel lock as an added layer of protection. These visible deterrents can make it harder for thieves to steal your car.

Conclusion

Wrapping your car keys in aluminum foil might seem like a strange habit, but in reality, it’s a simple, effective, and affordable way to protect your vehicle from the rising threat of keyless car theft. By blocking the radio signals from your key fob, aluminum foil can prevent thieves from using relay attacks to gain access to your car. While this trick is an easy solution, it’s important to combine it with other security measures for maximum protection. So, the next time you’re looking for a way to safeguard your vehicle, grab some aluminum foil—your car will thank you!