Car key remote control code scanner Car decoder Working principle Car key rolling code Structural analysis

 

The car key decoder is aptly called the universal treasure box by a considerable number of car owners. As long as the vehicle remote control signal password is received, the remote controller can be automatically programmed to generate a complete set of remote control signal passwords, which is equivalent to copying a decoder of the original remote control radio receiver and a notebook computer. When a vehicle owner uses a remote controller to open or close a door lock, a thief using a radio receiver intercepts an electronic signal sent from the remote controller, inputs the electronic signal into a notebook computer, analyzes and decodes the electronic signal by a specific computer software, and then The decoded electronic signal is copied. At the same time, the car thief took down the license plate and secretly followed the owner. After mastering the rules of the car parked by the car owner, he waited for an opportunity to use the duplicated electronic signals to open the car door lock to steal the car. Because this method is more complex, so the use of this method of thief thief specifically choose high-end car to start. As a car repair tool, the car decoder currently has no special regulations for the country. Relevant parties have suggested that the relevant departments should strengthen the management of the purchase and sale of car decoders to prevent this advanced car repair tool from being used by criminals. For example, on the sales channels, buyers are required to show their certificates and register with purchasers. Banned underground transactions.

When it comes to the principle of car decoder work, we must first explain the structure of car keys. In the past, the car key was only a piece of steel with a special tooth mark. As long as the tooth mark matched the special groove of the key hole, the ignition of the car could be started smoothly. The current car key has an electronic chip embedded in the plastic part of the tail. When the key is inserted into the ignition tank of the car, the transponder of the anti-theft system is activated. Both exchange signals via low-frequency coding. The electronic chip must answer the password requested by the anti-theft system and the vehicle can be started successfully.

The decoder can replace the electronic chip of the car key and "answer" the password of the "inquiry" of the car anti-theft system.

Then, how does the start code of the vehicle anti-theft system be cracked by the decoder? Mr. Pang, the technical director of a 4S shop, explained the reporter with an old Santana car. “This kind of car is a car one yard. Each car starts with a different code. The burglar does not need to know the code content. Just connect the car decoder to the anti-theft system and follow the code number and approximate rule. Try and try this code in a short time.

The new boot code is not fixed, it can also break it

Of course, with the renewal of car anti-theft technology, fewer and fewer cars now use "fixed yards."

Some new types of cars will generate a response process between the key chip and the anti-theft system after each use of the password. The formation and storage of new anti-theft codes will be much more difficult if the decoder wants to crack. There are also some high-end cars that simply eliminate the metal car key inserted into the structure of the ignition slot, and the electronic key of the car key is unlocked. The driver only needs to carry the car key with him and press the start button of the vehicle, and then the car's anti-theft system can search. To the presence of the car key chip, begin to answer the unlocking process.

Facing the new anti-theft technology, the difficulty of car theft becomes greater, but this does not mean that thieves will close their hands. According to the information on the Internet, there are a large number of online stores selling car decoders, and there are a wide variety of models available. Cheap decoders can be purchased for three or four hundred yuan, and expensive ones can have several thousand dollars. Smaller decoders and walkie-talkies are almost as big. A large car decoder looks like a laptop with a base. According to the seller, the decoder is actually a professional computer, cracking the anti-theft system is its mission.

Why "Automotive Doctor" Becomes a Steal

Here, perhaps some readers will be curious, who invented the car decoder? Since it is a crime tool for car theft, why not stop it?

The answer to this string of questions is very silent, because the car decoder is actually not the invention of a thief, but the wisdom of auto engineers. The car decoder, also known as the automobile fault diagnosis instrument, is a professional vehicle maintenance and inspection tool. It can generally be divided into two kinds, one is for the control of the door, mainly used for matching and test maintenance of the car remote control; the other is for the automotive engine or circuit failure.

Modern cars are equipped with "car computers". This part is called "ECU". The decoder can communicate with the car computer to exchange various information and obtain the important parameters of the computer work, so as to obtain the driving data record, key configuration and basic settings. Some targeted decoders can even diagnose problems with the vehicle like doctors and assist the repairer in clearing the fault.

Opening the vehicle's anti-theft system is just one of many features of the car decoder. Just like a scalpel, it was used to kill people. This is not to blame that the scalpel is too sharp and it is even more impossible to ban the manufacture of a scalpel.

Why vehicle anti-theft coding is more and more vulnerable

Car modification enthusiast Hua Xiaoyu said that vehicle anti-theft chips usually use RFID code to interact with anti-theft devices. The disadvantage of this coding is that only 40-bit encryption is used. 40-bit encryption used to take tens of days to crack, but now it only takes a few hours. Today's 256-bit encryption is considered a fairly complex and secure encryption algorithm and is now almost unbreakable. But perhaps in the near future, with the advancement of computer technology, the time for cracking will be greatly shortened.

He believes that cracking code depends mainly on computer technology, and the computer field has a famous "Moore's Law" - the number of transistors that can be accommodated in integrated circuits, will double about every 18 months, the performance will also be doubled . This law reveals the speed of progress in information technology. With the advancement of computer technology, it will not be possible. It may take several years for the unbreakable encryption code to become vulnerable.

Then, with stealing technology and anti-theft technology, who is more likely to win the final victory? Hua Xiaoyun believes that there can be no final winner because the two sides are like viruses and antibiotics, but only the party with faster progress can achieve a brief smooth transition.