Two experts agree that foil works — here’s how to do it.
Marcus Hutchins is an ex-hacker turned security researcher who recently showed people how to spot hidden cameras in Airbnbs and hotels. Now Marcus is back making people lead safer lives once again. This time it’s about auto thieves.
In the viral video above, Marcus explains how people can steal wireless car keys, saying, “The way in which thieves steal these is the car and the key talk to each other, and they use a very, very short-range frequency so that they can only hear each other when they’re very close. So the car knows if it can hear the key, the key is very close to the car, and it will allow the door to unlock and the engine to start.”
“So let’s say the owner is asleep in the house. They create a walkie-talkie-like device, except instead of voices, it’s for the frequency that both the car and key talk on. And they put one side near the door where it can pick up the car key’s signal and the other side near the car where it can pick up the car’s signal. And then it will send these wirelessly between each side, and essentially the car and key can talk to each other over a longer range.”
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“This trips the car into thinking the key is nearer when actually it’s just this walkie-talkie-like device, and as long as the two sides can talk to each other, the car will think the key is inside and allow the engine to keep running. This will allow them to drive to a nearby garage and swap out the module with a new key and then sell the car.”
“The big box the guy in front is holding is a really powerful antenna, and that’s going to be able to pick up the key’s signal from outside the house,” he explains in his TikTok.
“The smaller device that the guy in the back has relays that signal to the car allowing him to unlock the door and start the engine. Now, this is actually a lot easier than stealing a regular car. They can basically just walk up with this device and then drive off with the car.”
In Marcus’s initial video, he says that tightly wrapping aluminum foil around your key fob may help stop the break-in because it prevents the key from communicating with the car.
BuzzFeed also spoke with Digital Health, Safety, and Wellness expert August Brice. She is the founder of Tech Wellness — a platform informed by experts in cybersecurity, public health, and screen addictions to provide solutions for living safer and healthier in our digital world.
August confirmed that thieves use wireless transmitter boxes to pick up radio frequency identification (RFID) signals from key fobs, just as Marcus described. “They are using wireless transmitter boxes that were first developed for law enforcement — ugh,” she said.
Thanit Weerawan / Getty Images
And she backed Marcus’s claim that foil can successfully block RFID signals. To further prove her point, August actually made a video showing that, as long as a key fob is wrapped properly with an ample amount of foil, it successfully obstructs the signal. “When it’s doubled or quadrupled up and sealed well, it does the job of blocking the RFID signals.”
August Brice / Tech Wellness
August also points out in the video above that faradays may be an option as well. For those who don’t know, faradays are specifically designed to block RFID signals. “Key fob faradays are lined with material which has a blend of metallic threads to block an array of wireless signals,” she said.
Hopefully this info can help you save yourself from a potential break-in. Be safe out there!
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