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Understanding Key Fob Security: Protecting Your Vehicle

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03.04.2025

You use your key fob every day—locking and unlocking your car, maybe even starting the engine from a distance—without giving it a second thought. But as technology in vehicles advances, so do the methods used to compromise it. Keyless entry has made life more convenient, but it’s also introduced a new set of risks. If you’ve ever wondered how secure your key fob really is, or how you can protect yourself against modern car theft, this guide is for you.

How Your Key Fob Works

Key fobs operate by sending a low-frequency radio signal to your car. When the car recognizes the encrypted signal, it unlocks or starts the engine. It’s fast, wireless, and requires no physical interaction with the car—just proximity.

Most modern fobs also use a rolling code system that changes the signal each time, making it harder for thieves to duplicate. This technology helps protect against basic forms of signal cloning, but “harder” doesn’t mean “impossible.” Criminals have found ways to bypass even these security measures.

What Is a Relay Attack?

One of the most common forms of key fob theft today is the relay attack. It relies on extending the communication range of your key fob without your knowledge.

Here’s how it works: thieves use two devices. One person stands near your home, capturing the signal from your key fob—even through walls or windows. The second person uses a relay device to transmit that signal to your car. The car thinks the key fob is close and unlocks the doors. In some cases, they can even start the engine and drive off without ever seeing the key.

All of this can happen in seconds. There’s no broken glass, no forced entry, and often no alarms triggered. By the time you realize something’s wrong, your vehicle might already be gone.

Signal Jamming and Other Threats

Relay attacks aren’t the only thing to worry about. Another tactic thieves use is signal jamming. This involves blocking the signal between your key fob and your car when you attempt to lock it.

You might press the button and hear nothing unusual—but your car never actually locks. You walk away, thinking everything’s secure, while the thief simply opens the door and gains access.

Then there’s code grabbing, which involves intercepting your key fob’s signal and replaying it later to unlock the vehicle. While more complex and less common, it’s another reminder that your key fob isn’t just a convenience—it’s a target.

How to Protect Your Key Fob

Fortunately, there are several effective ways to protect your key fob. Start by storing it away from exterior walls and windows. The closer your fob is to the outside of your home, the easier it is for thieves to pick up its signal.

For stronger protection, use a Faraday pouch or metal container. These signal-blocking enclosures prevent any radio frequency from escaping, effectively rendering your fob invisible to relay devices. They’re inexpensive, easy to use, and highly effective.

If your vehicle allows it, consider disabling the keyless entry feature when not in use—especially overnight or when your car is parked for long periods. You’ll usually find this option in your car’s settings or user manual.

Make a habit of confirming your vehicle locks before walking away. Look for flashing lights or listen for the beep. These small checks can alert you if a jamming attempt has occurred.

Be cautious with third-party or aftermarket fobs. Not all of them use reliable encryption or high-quality components. A poorly designed fob could introduce new vulnerabilities rather than protecting against them.

Stay One Step Ahead

Keyless technology is here to stay, offering undeniable convenience to drivers. But with that convenience comes a new wave of digital risks. Thieves don’t need to break windows anymore—they just need the right equipment and an unsecured signal.

You don’t need to be a tech expert to protect yourself. Just understanding how your key fob works—and taking a few simple precautions—can significantly reduce your risk. Treat your fob like the digital key it is. Keep it protected, and you’ll keep your car safer, too.

Because in today’s world, car security isn’t just about the locks—it’s about the signal.

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