It sounds like something your paranoid uncle might suggest over Thanksgiving dinner — “Wrap your car key in foil, it’ll keep the hackers out.” But as it turns out, Uncle Foil Hat might actually be onto something.
Thanks to a tip from a former FBI agent, more people are grabbing the Reynolds Wrap and doing just that. And no, it’s not because they’re trying to cook their keys. It’s a surprisingly simple and effective way to keep one of your most valuable investments — your car — safe from a growing modern threat.
Let’s face it: our vehicles are essential. They take us to work, haul our groceries, drive our kids to practices, and give us the freedom to move through life. It’s one of the biggest purchases most of us will ever make — and keeping it secure is just common sense.
Now, many of us remember “The Club” — that iconic red steering wheel lock from the ’90s. It didn’t make your car theft-proof, but it screamed, “This is going to be a hassle, move on.” Thieves, generally being lazy opportunists, often did just that.
But today’s carjackers don’t need crowbars and lock picks — they just need a signal booster.
That’s right: thanks to wireless key fobs and push-button start systems, cars are now vulnerable to something called relay attacks. These hacks allow thieves to amplify or clone your key fob’s signal, tricking your vehicle into unlocking itself — all while your fob sits innocently on your kitchen counter or in your purse. You may not even realize it happened until your car is long gone.
Enter aluminum foil.
Yes, really.
According to Consumer Affairs and cybersecurity experts, wrapping your key fob in a layer of foil creates a sort of homemade Faraday cage — blocking electromagnetic signals and keeping hackers from accessing your fob’s code.
Moshe Shlisel, CEO of GuardKnox Cyber Technologies and former Israeli Air Force officer, knows a thing or two about defense. His background includes working on military-grade cyber protections for fighter jets. How does he store his car key at home? In a metal can. Wrapped in aluminum foil. That’s it.
He explains that even when your car is parked and silent, it’s constantly listening for your fob’s signal. Hackers can use cheap, off-the-shelf devices to intercept or extend that signal. So keeping your fob in foil isn’t crazy — it’s smart.
Holly Hubert, a former FBI agent and CEO of cybersecurity firm GlobalSecurityIQ, agrees. She calls aluminum foil “the most inexpensive way” to prevent this form of electronic car theft. As she told WSB-TV, cyber threats evolve fast — but sometimes, old-school solutions still work.
Automakers are catching up, with some rolling out keyless fobs that go into sleep mode. But until those are standard, Shlisel and other experts suggest this simple tip: at home, keep your key in a foil-lined tin or can. On the go? Wrapping it in foil is a good stopgap.
So if you see someone wrapping their car key like a leftover sandwich, don’t laugh — they might just be the smartest one in the parking lot.