Criminals can use this cheap device to unlock your car or garage

Hacker Samy Kamkar has produced a device – called the RollJam – which allows attackers to open your car or garage door.

The RollJam, which costs around $30 (under R400) to make, exploits a vulnerability in the car and garage remote control security systems.

Many car and garage remotes use rolling codes as an authentication method. These codes are essentially one-time codes which can only be used once. However, these codes do not expire.

RollJam exploits the fact that the codes do not expire. It has two radios: one to jam the airwaves and one to send the code to the car or garage door.

Since the signal is jammed, the first code sent by the owner does not work and is stored. The owner then presses their remote again.

The RollJam then intercepts the second code, and sends the first one to open the car or garage door.

The second code, which was never used, can now be stored and used at a later stage to open the door.

According to Kamkar, the RollJam will work on a wide range of cars, including Chrysler, Daewoo, Fiat, General Motors, Honda, Toyota, Volvo, Volkswagen, and Jaguar.

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Criminals can use this cheap device to unlock your car or garage