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Starting today you should start wrapping your key in aluminum foil.

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Starting Today, You Should Start Wrapping Your Key in Aluminum Foil – Here’s Why

It might sound strange at first, but wrapping your car key in aluminum foil is a simple hack that could help protect you from a growing threat in the digital age. With car theft methods becoming more high-tech than ever, this quick and inexpensive trick could be your first line of defense.

So what’s the deal with aluminum foil and your key? Let’s break it down.


🔐 The Problem: High-Tech Car Theft

Most modern vehicles come with keyless entry fobs. These devices allow you to unlock and start your car without ever taking the key out of your pocket or bag. While convenient, this technology also opens the door to a clever form of theft known as a relay attack.

Here’s how it works:

  • Thieves use a relay device to capture the signal from your key fob—even if it’s inside your house.
  • They transmit that signal to your car, tricking it into thinking the key is nearby.
  • In seconds, the thieves unlock the car, start the engine, and drive away—all without touching your key.

It’s fast, silent, and incredibly hard to detect until it’s too late.


🛡️ The Aluminum Foil Trick

Aluminum foil acts as a simple signal blocker, or what’s technically called a Faraday cage. Wrapping your key fob in aluminum foil can help prevent it from emitting a signal, making it harder (or impossible) for thieves to intercept.


✅ How to Do It:

  1. Tear off a small sheet of aluminum foil.
  2. Wrap your car key fob tightly in the foil, making sure it’s fully covered.
  3. Keep it wrapped anytime you’re not using the key—especially overnight or when at home.

You can also double up on protection by placing the foil-wrapped key in a drawer or metal container.

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