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Remote keyless entry (RKE) systems often urge their users to forget about their keys. In these systems, a key fob can remain in the driver鈥檚 pocket and unlock the car without the owner doing anything but pulling on the handle.

鈥淟ose your keys for good!鈥� Innovative Ignition Systems writes in their description of their PKE-100-V1 Universal Proximity Sensing Keyless Entry听system. But a new study by three researchers at the University of Birmingham and one at Kasper & Oswald GmbH, Germany, has found that the danger of keyless cars is not losing your keys, but losing your car.

鈥淭he results of this paper show that major manufacturers have used insecure schemes over more than 20 years,鈥� the paper concludes. Unlike previous research that has found simple solutions to hacking methods, there is no easy solution to this technique. 鈥淟ock it or lose it? Remove it!鈥� the researchers recommend. Has the best solution to car entry become the old-fashioned key?

The study, titled 鈥淟ock It and Still Lose It 鈥� On the (In)Security of Automotive Remote Keyless Entry Systems,鈥� tests two different remote keyless entry schemes: those used by Volkswagen (VW) vehicles between 1995 and today, and those used by a variety of other manufacturers. They find both systems can be hacked inexpensively and easily.

To enter a car without the key, hackers use signals from cheap and simple radios that are able to eavesdrop and record the codes used by keyless entry systems and then clone them.

Eavesdropping is easy because the Volkswagen Group only used a few cryptographic global master keys for the RKE systems, they write.

"With the knowledge of these keys, an adversary only has to eavesdrop a signal from a target remote control. Afterwards, he can decrypt this signal, obtain the current [identifier of the remote control] and counter value, and create a clone of the original remote control to lock or unlock any door of the target vehicle an arbitrary number of times," the researchers write.

As Wired's Andy Greenberg reports, however, the attack isn't a total cinch.

听Methods for hacking RKE systems have been found in the past. A few years ago, security researchers found that RKE vehicles could be hacked using power amplification.

鈥淚t鈥檚 a bit like a loudspeaker, so when you say hello over it, people who are 100 meters away can hear the word, 鈥榟ello,鈥� 鈥� Boris Danev told The New York Times. 鈥淵ou can buy these devices anywhere for under $100.鈥� Using this method, thieves have been able to enter cars when car fobs have been as far as a football field away, for example in the house when the car is in the driveway.

A car owner was able to simply solve this problem, though, by wrapping the fob in aluminum foil or putting it in the freezer, The New York Times reported.

Researchers say confirming this new scalable method may help explain unexplained thefts from locked vehicles from the last few years.

鈥淎s of today, even experts in car theft cases expressed the opinion that the alarm and electronic door locking systems of a car cannot be easily circumvented,鈥� the researchers write. 鈥淔rom now on, they have to consider that special universal remote controls to bypass the security mechanisms might be used by criminals.鈥� 听

Along with allowing drivers to forget their keys, RKEs make thefts practically invisible.

Instead of returning to the key, researchers recommend that manufacturers solve the security issues. 鈥淔or a 鈥榞ood鈥� RKE system, both secure cryptographic algorithms 鈥� and secure key distribution are necessary,鈥� they recommend.