Modern vehicle theft is evolving, moving beyond traditional methods like hotwiring or breaking windows. Today, one significant threat comes from criminals exploiting the convenience of keyless entry and push-button start systems. These systems rely on your key fob constantly emitting a low-power wireless signal that the car recognizes when it’s nearby. While incredibly convenient, this technology can be intercepted.
Thieves employ sophisticated but readily available electronic devices to perform what’s known as a relay attack. This technique involves two main components. One device, essentially a signal amplifier or booster, is brought close to where your key fob is located – often inside your home, near the front door or a window. This amplifier picks up the faint signal from your key fob. The amplified signal is then transmitted wirelessly to a second device held by an accomplice standing near your vehicle. This second device acts as a relay, effectively mimicking the presence of the actual key fob right next to the car.
The car’s security system is tricked into believing the legitimate key fob is within range. This allows the thief to unlock the doors and, more critically, start the engine with the push-button start system, all without ever needing the physical key. The car can then be driven away, often within minutes, leaving no sign of forced entry. This vulnerability affects a wide range of modern vehicles equipped with this technology.
Protecting yourself involves understanding this invisible threat. Simple, effective countermeasures exist. Storing your key fob inside a metal container, like a metal box or even a microwave oven (when not in use!), can help block the signal. A more convenient and popular solution is using a Faraday pouch or box specifically designed to shield the key fob‘s wireless signal. Placing your keys inside one of these pouches when you are home prevents the signal from being amplified and relayed, rendering this type of theft impossible. Additionally, keeping keys as far away from exterior walls, doors, and windows as possible adds another layer of security. Awareness of this high-tech method is the first step in preventing your car from becoming the next target.
Source: https://www.helpnetsecurity.com/2025/06/19/keyless-car-theft-research/
