| Car alarm | |
| The car alarm is an electronic device installed in a vehicle designed to protect it from a theft. The system consists generally of a main unit, the transceiver (antenna), key rings, shock sensor, the service button and indicator in the form of an LED. Car alarm systems come with the feedback that is stick-pager inform about the state of the car. Car alarm systems are not 100% guarantee against theft, but significantly reduce the attractiveness of small hijackers. Some models of car alarms can be connected GSM/GPRS module, with the ability to control the functions of signaling from a cell phone by sending SMS. Conversational code is a special way of security alarm systems. It uses to identify the key fob is widely known in cryptography authentication technology through an insecure channel. Receiving the signal, the system makes sure that it sent from its fob and it occurs not once, but in the dialogue. In response to the first signal system sends a query on a charm in the form of a random number, which is handled by a special algorithm charm and sent back. Alarm system process parcel on the same algorithm by comparing the answer with data. If they match, the command runs, but on the key fob sends a confirmation. Conversational code provides additional protection against electronic attacks. There are also alarms with auto. Some models provided auto run on the fact of temperature drop hood space to a certain level and with a certain interval of time. The function of anti distraction allows setting the car the alarm system without the participation of the owner of the car. If when removing the machine from protection by means of radio and opened the door for a specified time, alarm system automatically determines that the removal of security was false and produces lock the car. Car security system is able to operate successfully after a power cut, which greatly complicates the task of car thieves. However, experts in the field of protection believe that the best option is to install two locking systems - active and passive. The practice of simultaneous operation of electronic anti-theft systems shows that neutralize one lock, the thieves usually do not have time for neutralization of the second lock. | |
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