Key Fob Signals are essential for convenient car access, but they are also vulnerable to sophisticated attacks. Understanding how these attacks work is crucial for vehicle security. Two common methods are “rolljam” and relay attacks, both exploiting weaknesses in key fob signal technology.
A rolljam attack, also known as a jamming or replay attack, targets the key fob signal directly. The attacker uses a device to intercept and block the radio signal when you press the lock or unlock button. Thinking your key fob signal didn’t register, you press the button again, unknowingly providing the attacker with a second key fob signal code. The attacker then replays the first recorded key fob signal to operate your car, while retaining the second code for future unauthorized access.
In contrast, a relay attack, sometimes called a “man-in-the-middle” attack, involves two attackers working in tandem to exploit the key fob signal range. One attacker, positioned near your key fob, uses a device to capture and amplify the low-frequency broadcast signal. This amplified key fob signal is then relayed to a second attacker stationed near your vehicle. Your car, tricked into believing the key fob signal is legitimate and nearby, unlocks.
Protecting your key fob signal from these attacks requires proactive measures. A simple yet effective method to prevent relay attacks is storing your key fob in a Faraday cage pouch. This blocks the key fob signal from being transmitted or intercepted. For rolljam attacks, manually locking your car doors, especially in potentially risky environments, can bypass the key fob signal vulnerability. Physical deterrents like The Club offer an additional layer of security. While these aren’t perfect solutions, understanding and addressing key fob signal weaknesses is vital for safeguarding your vehicle against modern theft techniques.
