Adam wrote:

> "Yaddha" > wrote in message
> ...
>>
>> I just checked my locks, but nothing was wrong. No damage and I could
>> lock and unlock the doors without any problems. Could it be possible
>> that someone has a universal remote or copied my signal or something?
>
> Very unlikely. Those signals work on a rotating frequency based on an
> individual algorithm for your car.

Erm, do you mean model or spefcific vehicle. I feel either is unlikley
since I very much doubt that Alfa produce their own anti-theft systems, and
to produce a new algorithm for each model seems a bit pointless. OTOH you
will probably find that the 'key' is a unique, randomly generated (large)
mumber, unique to a specific vehicle.

>I would say it is far more likely that
> the thief was either extremely careful or you might have simply left the
> doors open.

Agreed.
> In theory
it may be possible to clone a signal, but the chances of doing
> so would be quite remote. You would have to either know a lot about the
> certain algorithms used for your model of car, and have followed you
> around long enough to guess which algorithm fits your key/car, and then
> have monitored the last signal to be sent to the car, and then programmed
> your learning remote to send the next signal.

Yep, or one of a small subset of signals (see below)

> And besides, if they had done that, it would have thrown out the
> relationship between genuine remote/car and the remote would no longer
> function for you.

Not true (at lease AFAIK) the receiver will accept one a of set of signals,
not just a single one. Otherwise, if you pressed your remote just once,
out of range of the car, you'd be out of synch and not be able to open it.

> Of course, it is possible your car (or Alfas in Europe in general) are
> fitted with less complicated remote systems, but even the type I have
> described above (the rolling code) has been pretty standard for the last
> 5-8 years at least.

Indeed. That's when I learned about them. I could, of course, be talking
utter crap......
> - Adam Ghijben
>
> 1969 1750 GTV Series 1 - Red

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