secure garage door opener?
January 15, 2009 9:54 AM   Subscribe

Can you recommend a secure remote controlled garage door opener?

I'd like to get an automatic garage door opener. Funnily enough, I don't want anyone else to be able to open it.

The makers all claim theirs are secure, but are any of them actually public about what they're doing to make them secure so that one can be assured that their security doesn't depend on obscurity?

(Please save me from contriving my own wifi-based remote.)
posted by Zed to Home & Garden (3 answers total)
Overhead Door is secure.
posted by Zambrano at 10:17 AM on January 15, 2009

Wikipedia actually has a fairly good summary of the rotating-code garage door opener. Once the remote and the opener are sync'd, they communicate a hash of the next code to each other. You can get a good idea of which ones are most secure by Googling the annoyance people have trying to program their "universal" openers (either built into their cars, or standalone) to open their garage doors.

Locks only keep honest people out.
posted by ikkyu2 at 10:37 AM on January 15, 2009

There's a basic introduction to these systems here. According to Wikipedia, KeeLoq is a popular system that was recently found to have a problem with it.

That said, when I look at this paper describing an attack, it relies on gathering a large number of ciphertexts, which is practical if your garage door opener is fully automatic, but if you have to press a button to open/close the door gathering the 2^16 ciphertexts required for the attack would be less easy. That paper also has a nice overview of the state of the art in attacking KeeLoq.

If I was a burglar I'd break a window rather than cryptoanalysing your garage door opener
posted by Mike1024 at 10:42 AM on January 15, 2009 [1 favorite]

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