Some thieves force the window of the car to have a good opening. The car door is later unlocked and locked. They then pop the hood, disconnect the battery and look for the ignition cable. If still, the method does not work, thieves have ample time to manipulate car alarm.
How do you steal a car in less than 15 seconds? To steal a keyless car, all it takes is the know-how on Basic Encryption 101. In the Johns Hopkins/RSA study, the authors simulated the car's ignition system using a laptop. They made several scans in less than 1 second without the victim knowing. They use the laptop to try various combinations until the right combinations were yielded. Finally, they gained entrance to the car and started it.
Nonetheless, they have to really serve their purpose. These days, OEM and aftermarket immobilizers are now integrated in Chrysler, Hyundai, Nissan, Mitsubishi and Ford accessories. Other cars with this safety feature are Dodge Neon, Lincoln Continental and Town Car, Plymouth Breeze, Toyota Landcruiser and 4Runner, Ford Windstar, Crown Victoria, and Contour, and the Mercury Marquis. Jeep Cherokee accessories and Nissan Pathfinder accessories also integrate sophisticated immobilizer systems.
The latter also contains unalterable identification code. It works by employing radio frequency and signal powers.