[paduc]

Can't you use this to capture car-key signals and replicate them later? Sounds like the perfect tool for that.

[cweaver]

I'm pretty sure car keys use a rolling code to avoid this type of attack.

[ortusdux]

Here is a spec sheet from '96:

http://www.ti.com/lit/ds/slws011d/slws011d.pdf

Back then they used a 40 bit rolling code.

Found here: http://auto.howstuffworks.com/remote-entry2.htm

[serf]

If only we had a time machine, we could open garage doors EVERYWHERE!