Modern car keys constantly transmit signals, making them vulnerable to theft—even without physical access. Thieves can buy a matching key and replicate your vehicle’s access code using cheap, widely available devices.

To prevent this, cybersecurity experts recommend wrapping your keys in aluminum foil. It creates a shield that blocks electromagnetic waves, preventing unauthorized access. While not perfect, it’s a simple and inexpensive solution.

A more effective option is a Faraday bag, which you can buy online for a few dollars. These pouches offer better insulation and prevent signal transmission.

Moshe Shlisel, CEO of GuardKnox Cyber Technologies and former Israeli Air Force expert, explains the risk: “It’s like a song constantly playing between your car and the key. If someone knows the tune, they can open the lock.”

He warns that keyless car thefts are rising, with how-to guides readily available online. Automakers are working on stronger protections, but until then, precautions matter.