[] Richard wrote:
The Palm can -- with the correct software -- act as a
learning remote. You take your Chrysler IR door "key",
point it at the Palm when it's in "learn" mode, and
press the button. The same thing could be done w/ a
$10 remote you buy at Walgreens. Or if you have
a metal key and I can take it over to Home Depot
for a few minutes, I can get a copy of that.
[] On the cheaper RKE devices this is true because they don't
re-encrypt the entry key everytime you get into your car.
However, if your remote keyless entry device is based on a Microchip
KeyLoq device, the two do a cooperative change to rekey themselves
so the next time you unlock your car, you are using a new code to get in.
They use code hopping to keep changing the ID code that is used to
unlock the device. (http://www.microchip.com;
http://www.microchip.com/10/Lit/Security/index.htm)
The rekey code is 32 bits (I think) so you can do the math on the number
of codes required to get in. Also there is more to the protocol than just
sending the code to the receiver. (the code hopping is more sophisticated
than just transmitting the new code to the receiver)
John
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