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Re:Tesla Plans to Open Car Doors to All Hackers This Summer by Syrup-tan on Tuesday April 28, 2015 @04:07PM (#9454808)
Adding on the idea of a specific frequency; what if the car also sends a few ``honeypot'' signals at different frequencies, near the real frequency.

If the attack tries to amplify a given range, the honey pot signals will also be amplified, and the car can refuse to be opened.

Re:Tesla Plans to Open Car Doors to All Hackers This Summer by TheLoneWolfling on Tuesday April 28, 2015 @05:05PM (#9455147)
You're assuming omnidirectional amplification. It's easy enough to amplify without leaking more signal back to the source than, say, a metal-faced wall would.