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The electric immobiliser/alarm system was invented by St. George Evans and Edward Birkenbuel and patented in 1919. [2] They developed a 3x3 grid of double-contact switches on a panel mounted inside the car so when the ignition switch was activated, current from the battery (or magneto) went to the spark plugs allowing the engine to start, or immobilizing the vehicle and sounding the horn. [3]
SecuriLock, also known as Passive Anti-Theft System (PATS), is an immobilizer technology that Ford began using select Ford as well as Lincoln, and Mercury models. Each key have a radio frequency transponder embedded in the plastic head with a unique electronic identification code.
In the case of vehicle theft, the best deterrent to theft is in the installation of an approved vehicle anti-theft passive immobilizer. Many vehicles have factory-installed anti-theft units, which provide protection through the ignition system. Under the hood there is a computer that controls the operation of the engine.
Car alarms should not be confused with immobilizers; although the purpose of both may be to deter car theft, they operate in a dissimilar fashion.An immobilizer generally will not offer any audible or visual theft deterrence, nor require any more input from the driver than from the driver of a non-immobilizer car.
A video was posted on TikTok on July 12, 2022, where the author uses a USB connector on a naked key slot and successfully starts a car. [11] This vulnerability exists on a type of ignition switch used in many Kia/Hyundai cars sold until 2021, which are not equipped with an immobilizer system. [12] The video was taken down on July 25. [11]
The first KeylessGo ECU of the Mercedes-Benz S-Class. The smart key allows the driver to keep the key fob pocketed when unlocking, locking and starting the vehicle. The key is identified via one of several antennas in the car's bodywork and an ISM band radio pulse generator in the key housing.
An attacker may be able to learn the code word that opened the door just now, but the receiver will not accept that code word for the foreseeable future. A rolling code system uses cryptographic methods that allow the remote control and the receiver to share codewords but make it difficult for an attacker to break the cryptography.
The system also allows a user to leave the ignition key in the vehicle, for later retrieval — including by another user sharing a unique entry code. Two hikers, for example, can leave the keys in the glove box, lock the door, and either hiker can return later to access the vehicle via their own code.