>
>
>  It seems to me the only way the key fob is going to be able to be
> copied is if someone presses one of the
>  buttons to transmit the signal.  If it is just sitting on a table or
> hanging on a wall hook, how would
>  someone outside the home (or bldg.) cause the key fob to transmit?




This is a misunderstanding. I cannot claim to know the underlying
technology, but
many new car keyfobs today are "proximity devices". Fob in pocket, press
button
on dash to start car. Definitely do not have to press any buttons on the
fob.

I've not read Russell's linked article, but I did recently read an article
claiming
thieves were using SDR as a repeater to significantly boost the range of
what the
car considers "proximity". The claim was with your keys on a hook by your
front
door, they could use a repeater outside and drive the car away.

The really fun trick here is they make no effort to capture or crack any
codes,
just boost a signal.


-Denny
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.