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A NY Times columnist had his car stolen by kids who were possibly using a repeater to rebroadcast his key fob:
Keyless entry systems typically only communicate with their remote fobs over the distance of a few feet, but he thinks that the gadget is capable of extending this range, fooling the car into thinking that the remote is within range even though it was actually in Bilton's House, about 50 feet away. He arrived at this theory after he consulted with Boris Danev, a Swiss-based security expert:
"It's a bit like a loudspeaker, so when you say hello over it, people who are 100 meters away can hear the word, 'hello,'" Mr. Danev said. "You can buy these devices anywhere for under $100." He said some of the lower-range devices cost as little as $17 and can be bought online on sites like eBay, Amazon and Craigslist.
Sounds creative and easy. Maybe those clubs aren't so silly after all.
(Score: 2, Disagree) by frojack on Friday April 17 2015, @08:24PM
Pretty much the same as my Chrysler. (And not at all clear as to the inner workings).
But it STILL can't be as simple as amplifying the fob signal, otherwise my fob would open every Chrysler.
What I suspect:
1) Fob batteries would not last long enough if they were constantly transmitting. Constant receiving takes very little power.
2) The car probably sends out a weak "Hello Fob" signal that the fob listens for. This would not need to be unique, but could have an authentication code attached).
3) Fob sends out a weak transmission of its returning digital key.
4) Car matches key, and unlocks doors.
So possible outcomes:
a) If the returning key can be computed from the Hello Fob call, someone needs to find that engineer and bitch slap him mercilessly. (I don't discount this by the way). And your break in box could simply compute the proper response in real time, and transmit it.
b) if the fob simply returns a unique key that the the car listens for, you would have to lurk near the car to capture these, and play them back later.
c) If there are a small set of these semi-unique keys your break-in-box would transmit them all in response to any car's Hello Fob signal.
No, you are mistaken. I've always had this sig.
(Score: 2) by FatPhil on Saturday April 18 2015, @10:58AM
You just said the equivalent of: "But it STILL can't be as simple as copying the key, otherwise my key would open every lock."
How can you not understand the concept of the (electronic) key and the (electronic) lock being paired?
Great minds discuss ideas; average minds discuss events; small minds discuss people; the smallest discuss themselves
(Score: 2) by FatPhil on Saturday April 18 2015, @11:12AM
Why did you say:
> But it STILL can't be as simple as amplifying the fob signal, otherwise my fob would open every Chrysler.
rather than:
But it STILL can't be as simple as amplifying the fob signal, otherwise my fob would open every car.
?
Now think about your answer.
She never posts, so you'll never get the chance to mod her +1 Insightful. I will happily take them by proxy :-)
(don't bother, always capped, even after the flamebait storm I got myself in last weekend.)
Great minds discuss ideas; average minds discuss events; small minds discuss people; the smallest discuss themselves
(Score: 0) by Anonymous Coward on Monday April 20 2015, @11:58PM
uhh, how many g/f's do you have? You later said she, so I'm guessing just one?