Shoot the radio waves from the smart key!

Prevents "fear relay attack" with familiar things!?

　"Relay attack" has been a hot topic these days.A new strategy such as volleyball? Hero's special move? No, this is a new car theft method.It's a car thief technique used by bad guys.

　The target of the relay attack is a car that uses a "key that can unlock the door or engine", which is called a smart key.Many Imadoki cars use smart keys.

　It is a mechanism that the key and the car can communicate with the radio waves and the engine can start with a button and unlock the door, but if the body (communication machine point) is not close enough, the engine is not close.It cannot be applied or unlocked.It depends on the model, but you may not be able to release the door lock unless the body and key distance is 1m or less, or you can not start the engine unless the key is in the car.

　However, in the case of a relay attack, it is possible to unlock the door or start the engine even if the car and the smart key are not close.For example, even if a smart key is placed at the entrance and a car is parked in the parking lot outside the house, the villain will unlock the door and steal the car.

　How are you doing? It seems that the front of the front door and the car in the parking lot are "special tools" and "are close to radio waves."As the smart keys and cars are close enough, they "deceive cars and smart keys."

　Of course, there is a possibility that a relay attack will be performed, besides the situation of smart keys at the entrance and cars in the outside parking lot.Smart keys near the window, cars outside, smart keys inside the campsite tent, cars in a parking lot a little away.If the culprit (or) approaches a smart key and car to some extent (within 1 m), the car may be stolen by a relay attack.

　It's dangerous !! What should I do?

　One of the measures that can be done right now is to block the radio waves emitted by the smart key.By communicating on a smart key and car on radio waves, it is possible to unlock or start the engine, but if the communication is cut off, it is impossible to unlock or start the engine.In other words, you can prevent relay attacks.The radio wave transmission and receiving part on the car side are embedded in multiple places, so it is difficult to block the radio waves, but the smart keys are small, so it seems easy to block radio waves.

　So, I tried to "cut off radio waves from smart keys" with that kind of hand.I tried it with something close to me and what I can get right away, so I would like to report on the method and results below ~ ♪

　The results described below are tried with my car and smart key.I think the result will change depending on the model, so just for your reference.If you actually use the following method as a relay attack measure, try it yourself and do it before execution.Even if the result is "I used the method introduced here, but I was stolen luxury cars in the relay attack!"