ASCII.jp car stolen!? The fifth choice of relay attack strategy

What is a Rui Rui attack?

"Relay attack" is the latest means to steal cars using the function of smart keys. Since May last year, Japan has also confirmed the victimization, and TV news has also reported it, so some readers may know.

The smart key is a convenient tool that does not need to take the key (transmitter) out of the pocket or bag, but can be unlocked by holding the door handle or starting the engine with a button. Even when your hands are blocked by luggage, you don't need to take out the key, so it is very popular in many cars now.

Automakers will not disclose the detailed structure of smart keys because of safety concerns. But, in fact, using a cryptographic technique called a scroll code, the response of the key and the car at a distance of about 70 centimeters is the principle. It is said that forgery is almost impossible.

However, the real key and the car's response are relayed by a special communicator, and the smart key is nearby, the same "relay attack" that gives the car the illusion.

The means and principles of Rui Rui's attack. The frequency of actual use varies according to domestic law.

The hacker countermeasure conference "The hack in the box" held in Amsterdam in recent years also announced that cars 300m away from smart keys had been stolen. It is said that the prototype, made by a research team of Beijing Security Company, cost only 22 US dollars. Ah!

Therefore, this is the countermeasure.

Countermeasures of Relay attack and Intelligent five options

In this article, as an experiment, after the countermeasure, open the key near the door to test. Please note that this is a test in the author's environment and does not prevent all theft.

The author's initial countermeasure is this. I used to put it in the iron box I bought when I wrote the EMP countermeasure article, but I can't. In YouTube and other places, highly airtight jars like tea canisters seem to be very effective, but the author's box can also be unlocked if it leaks radio waves from subtle cracks.

I tried to put it in a metal (iron) box. Even if the lid is closed, the radio waves will leak and can be unlocked.

As stated in foreign reports, security measures such as EMP and Wi-Fi may be different examples.

Among the latest cars, there is a model that can remove the smart key function from the car settings. In the author's car, there is no need to ask the dealer, it can be set to close, so it is very convenient. However, every time the engine starts, it is troublesome to put the smart key close to the car's start switch, which is a disadvantage.

Tightly wrapped in aluminum foil is an easy countermeasure.

There is no extra cost, and the immediate solution is to wrap the smart key tightly in aluminum foil. Because they don't cook, people who don't have aluminum foil at home are a different matter. ). The size of the smart key is almost the same, which is a simple method. The author is also surprised by the power of aluminum foil. The disadvantage of this countermeasure is that aluminum foil is not durable and not very fashionable. (laughter).

Smart keys sold by Toyota after December 2012 and by Subaru after 2016 may be equipped with power-saving mode (power-saving mode) function.

The author used this method a few days before the next "relay attack countermeasure case" arrived, but because the smart key button is very small, sometimes troublesome and disappointing, so it ranked second on the list.

To see if your smart key supports power-saving mode, press the unlock button twice while pressing the lock button, and the red LED flashes four times. To restore, press any of the smart keys to release.

I do not like the texture of plastic, pockets, bags may hurt the phone and other images, so generations of smart keys have been used in the box.

It can be seen that the inside of the special shell uses a cloth to block off the radio waves. The chain and pendant are added by the author.

It is also for this reason that the first place the author chooses is the countermeasure of using the key shell of blocking radio waves. However, since many protection boxes are made for the credit of mobile phones and IC chips, it can be difficult to choose the best size for your lifestyle and smart keys.

In the United States where the author is studying abroad, I frequently see and hear the alarm device of the sound and whistle and the heavy lock installed on the steering wheel. Although very wild, a little looking forward to, but may not be suitable for Japan's dense housing situation. The author personally believes that.

However, it is effective if the parking place is far from home, or if you stay in a nearby place with less accommodation.

Finally, theft and countermeasures is an ever-changing game of weasels. Please don't forget to add an insurance option against vehicle theft.

Graduated from Tokyo Electric University. The graduation thesis is artificial intelligence (expert system). One of the close-up interpretations of "Cross up the Magician" to a small audience. Starred in more than 100 TV shows and TVCM, including prime-time special programs. LVMH (Mohenesi Louis Vuitton) group, in addition to being appointed as the brand Ambasad, also shows magic to ambassadors and financial circles, including successive prime ministers. There are also many performances abroad, and Prince Charles of the United Kingdom is also a member-the golden star member of The Magic Circle London.

His works include "intellectual distance" (published by Kan), "moving Secret language" (Japan Industrial Press), "the brain for creating Art" (co-author, University of Tokyo Publishing Association), and "A Book for New employees" (co-authored, published by Nippon Jingtuan).