Many cars no longer require a physical key and instead rely on a wireless key fob to both unlock doors and start the engine. While this may be more convenient and rather cool, it is not as secure as having a physical key with an embedded chip. This is on full display at 1Addicts.com, a site dedicated to the BMW 1 Series. A user posted security camera footage of thieves breaking into his car, cloning the wireless fob, and driving off in only three minutes.
1Addicts.com also has video showing how quick and easy it is to clone a keyfob. It"s an interesting look into how easy the attack actually is. This attack can also presumably be used on other vehicle makes and models, although BMW seems to have the biggest problem at this time and it may be due to the “blind spot” in the sensor.
Source: 1Addicts Forum