The inventor is David T. moment. The unusual idea was the following – the brake pedal after ignition immediately blocked, and to disable car alarm systems as required to keep the ignition key in the on position for 10 seconds. In the first half of the 80 radio channel unilateral signaling experienced the peak of its popularity. Since 1980 operation includes radio-controlled or "contactless" devices that can remotely disable the car alarm and unlock the car door. In this work based on the signaling technology rfid (Radio-Frequency Identification), rfid.
rfid – label is located in the key fob, containing a special series of code unique to each car, and could be more than 1 million possible combinations. These were the first steps of encryption rds. The code is a recurring 40-bit sequence. Pressing the button is disarmed, keyring sent radio 40-bit code, along with a team of automatic opening doors. If sent identification code passed, the car door unlocked.
In the future, this technology is widely used in contactless immobilizer. In the future expansion of functionality alarm systems provided by the inclusion in the protective range of different sensors. The situation changed dramatically after the two-level shock sensor, which can be set up "the force of impact on preventive and primary levels. In the next decade, many automotive giants (General Motors, DaimlerChrysler, Ford, etc.) included in the original equipment of their cars different staff security systems. Standard established immobilizers were installed on some European cars since the mid 80's. With the increase in the fleet around the world and the persistent rise in crime, increased the number of selling car alarms.