[Discuss-gnuradio] Car alarms and garage door openers

[Matt Ettus]

After the Wired article today, I've received a couple of email from 
people who are concerned that the USRP could be used to clone their 
keyfob transmitters for car alarms and garage doors.  I'm not concerned, 
since there are already many ways to do this (just check the back of 
pupular science magazine).  However, I am curious about it.  I know that 
we can capture and play back any rf signal.  The question is whether 
that replayed signal would result in the door being unlocked.  I was 
under the impression that most of those systems allow an unlock code to 
only be used once, but does anyone out there know for sure?

Matt