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If you own a new car, there's a good chance that it features some form of keyless security. Whether it helps unlock your car or lets you start it with the push of a button, it makes driving all that bit easier. That's unless it's the reason your car gets stolen. Police forces all over the UK are reporting a rise in keyless car thefts, but a new report released by the Metropolitan Police today suggests that it now accounts for over a quarter of all vehicle thefts across London
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Denninger writes ...

the simplest way to steal a car with so-called "advanced keys", that is those that you don't have to press a button on a fob to unlock the doors and which has keyless start, is as trivial a paired set of radios and a confederate that gets close enough to you (5' or so) to be able to excite your key in your pocket while his "buddy" stands outside your car's door and pulls the handle. The car thinks the key is next to it and the key thinks the car is next to it; they transmit their coded handshake and voila!

Next said thief sits in the car and hits START. Same thing -- the key talks to the car, the car starts. So long as you don't turn it off you can drive it.

The ugly part of this is that the frequencies aren't secret -- nor can they be, since the fobs and the cars are both intentional transmitters and thus have to operate on specific authorized frequencies. The coding can be secret but that doesn't matter since you don't need to break the code -- just make the key think it's next to the car and vice-versa.
 
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