I guess what I’m asking is if garage remotes are secure.
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There are small devices called grabbers that do this and they are effective at bypassing rolling codes in garage doors and cars ect. I have never seen one but they do come up in conversation a far bit
Most have rolling codes so that won’t work.
What they could do is wait until you hit close then run underneath the door and over the sensor. If you don’t typically pay attention to your door closing, this could allow someone entry.
It’s pretty cheap to get a garage door sensor to alert your phone that the garage door is open.
If it’s not encrypted it’s possible to replicate. I’ve heard of signal grabbers since the 90s. So yes it is possible. Camera systems don’t cost 5000$ anymore so that would be a good route if you are worried.
I get alerted anywhere in the world if a squirrel farts on my property.
It depends.
If you have a modern rolling code garage door opener, that’s more secure than the old kind where you set the little switches inside. The fixed code kind were highly susceptible to this attack, and gadgets were sold for precisely this attack.
That said, if you have a well-funded adversary with months of time to spend recording your remote and using lots of resources, then nothing you could afford would be secure.
Older garage door openers, which are still in common use, use a fixed code. These are very easy to capture and replay, because they don’t change. Worse than that, there are only a relatively small number of combinations, and it’s easy to just play through all of the combinations in just a few minutes without needing to capture anything.
Modern garage door openers are a little smarter. Instead of using a fixed code, they use a code that changes every time you push the button (“rolling codes”). Even if you capture many codes, you can’t easily predict what the next code is. But if you are able to interfere with the garage door’s ability to hear the code, you can capture and replay the unheard code and the garage door will accept it.
This is challenging to do in practice, since if you’re capturing and jamming someone pushing their button, they’re expecting their door to open, so you have to potentially capture more than one code as they sit there frustrated, and replay the first code in order to get the door to open so that they won’t be suspicious. This will leave you with one of the later codes that you can replay later.
Yes, they can. But that doesn’t mean your garage will open.
Since decades rolling codes are used, which change all the time.
Depending on the exact system, certain vulnerabilities exist, but it is not as simple as replaying the same signal.
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