Evolution of car alarm coding

Car alarm signal coding The car alarm market is currently full. The boxes are full of attractive features, and if you turn to the Internet-it will confuse you even more, because marketing propaganda and unfair competition can confuse anyone.

Car alarm is a special device that is designed to notify the owner of unauthorized actions in relation to his car.

The world of alarms has many faces, the differences between individual models are distinguished by a variety of parameters, including the range, feedback and GSM GPS module, advanced signal coding, as well as other useful functions.

Types of encodings

The weakest part of the car alarm is the radio signal transmitted from the key fob to the main unit. The more advanced the coding technology of this signal, the more the attackers are trying to improve the grabbers to disarm the car.

Security systems manufacturers are developing new ways to encode the radio signal to improve their products. Let's follow the evolution of signal coding in car alarms.

At the very beginning of its history, the encoding was very simple. Then the hijackers armed themselves with scanners. This device goes through the code until the car is unlocked. In response, the developers of alarm created a protection against scanning, which blocked the search of codes.

The attackers are once again developing a device for hacking car alarms. This time it is a grabber-a transceiver that remembers one of the codes reproduced by the owner of the car when it is armed. Then this code was recreated again, thereby removing the system from the alarm.

Dynamic Code

To deal with grabbers, alarm manufacturers began to use a dynamic code, that is, each time the key fob sends a new code to the main unit. The selection method does not find such a code for several years.

Advanced grabber works on a different principle. He sends interference when the car is armed by its owner. As a result, the attacker records several suitable codes that have not yet been used. It remains only to reproduce one of them. This situation arose in part from the fact that the arming and removal from the alarm system was carried out with one button, that is, in fact, one type of signal was used. A partial solution to the problem was the use of different buttons to turn on and off the car alarm. Thus, the attackers can not break the alarm, unless of course you start pressing all the buttons in a row, in case of unsuccessful arming the first time.

Security systems manufacturers are constantly improving their radio signal coding systems. Recently, the dynamic code KeeLog and KeeLog + is popular. Advanced manufacturers work independently with companies involved in e-cryptography. As a result of cooperation, original dynamic codes are developed.

For example, the manufacturer of car alarm Sheriff and Challenger use the dynamic code of the new generation-CFM and CFM II. The code change occurs by algorithms that are kept in strict secrecy. In the process of programming the keyfob of the alarm, each instance is assigned not only a unique bit number, but also an individual code change law. This information is recorded in the alarm memory once and does not appear on the radio. In addition, the code has static and dynamic parts. The static part varies from batch to batch, besides it is known only to one person. This is all to increase the secrecy of radio transmission, while breaking the code is almost impossible.

Hijacking technologies also do not stand still, so the developers of car alarm systems are constantly improving their product.

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