Jamming Remote Controls

The range of issues I get involved in always amazes me. I recently had a client ask me for solutions to garage door and gate remote jammers. Jammers are simple devices that transmit enough radio frequency noise to prevent a legitimate signal from activating the garage door or gate. These remote systems operate in the 300Mhz to 400Mhz range.

It seems an executive was car jacked when his gate remote didn’t work. He got out to unlock the gate manually and his car was stolen. The police speculated that the thief used a radio jammer to prevent the gate opening.

Research into solutions for this led me to jammers for car remotes. Most of these operate in the ranges of 433Mhz, 315Mhz, and 868Mhz.

No practical technical solution exists for this type of attack. My solution was to eliminate the gate and garage door remotes in favour of more advanced access control systems. The car remote is something else. Training people to stop using them is going to be a difficult task, but it may be necessary in some threat environments.

The car remote being jammed may expose the user to robbery, assassination, or abduction due to a delay while trying to open the car door. Worse, if the user doesn’t check if the door is locked after using the remote, then an explosive device could be planted in their vehicle and commanded to explode near a high-value target.

The best solution for this problem is a thorough understanding of the user’s threat environment.