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Reverse engineering a car key fob signal

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Re: Reverse engineering a car key fob signal

#81

Post by buescher »

bigiain wrote: post #71
tzs wrote: post #52

Earlier quoted context omitted.

Let's start with fixed code systems. In those the remote sends the same signal every time. There will usually be some way to customize this signal, such as a set of DIP switches in the remote and in the head unit so that you can set your system to a different fixed signal than you neighbor's fixed signal. A learning remote for such a system could work by simply replaying whatever it heard when it recorded during lear…

Samy Kumar did a project about 10 years back, where he worked out how to brute force a 12 bit garage door code in under 10 seconds, using a childs toy: http://samy.pl/opensesame/ My garage door opener uses a 12 but dip switch config (and my last place used an 8 dip switch config, and I'm pretty sure still does). Re reading that OpenSesame post was fun. It reminded me of a few names I need to go find out what they're…

OpenSesame is really cool. It depends on the receiver using a shift register and the protocol not having stop bits (or equivalent), otherwise running a DeBruijn sequence that contains all the possible codes won't work.

Re: Reverse engineering a car key fob signal

#82

Post by hnick »

oarsinsync wrote: post #76
hnick wrote: post #72

Earlier quoted context omitted.

Ultimately, if it were a severe problem, wouldn't insurance premiums reflect this?

They do. Try to get a Range Rover insured in the UK. You’ll struggle.

Interesting, I searched and that seems accurate, it doesn't seem to be the case here in AU though from what I've seen.

Re: Reverse engineering a car key fob signal

#83

Post by Grimblewald »

0x457 wrote: post #53
gigel82 wrote: post #42

I wish car manufacturers would start making tiny (maybe RFID) remotes I could stick in my (minimalist) wallet. Alternatively, looking forward to a tiny Flipper-like (credit-card sized) that can achieve the same result. Seriously, the car fob is the largest thing in my pocket after the phone (thickness-wise at least).

I think what you wish is your phone to be your car key.

the show it's always sunny in philadelphia has a good episode covering this idea, the episode is 'dennis takes a mental health day'

Re: Reverse engineering a car key fob signal

#84

Post by pests »

0x457 wrote: post #65
imp0cat wrote: post #62

Earlier quoted context omitted.

And you can already have that!

Yes. However, I'm only aware of a Tesla that actually turns your phone/watch into an actual proximity key fob. Not to be confused with what others do: - open an app - login again because devs can't figure out persistence between updates - wait for thing to connect and load slow af UI - click on unlock button in the app - wait - wait - wait - wait - give up - do not renew service after 1 year trial expired because it…

Tesla also has the key card, which you could just put in your wallet.

Re: Reverse engineering a car key fob signal

#85

Post by oarsinsync »

hnick wrote: post #82
oarsinsync wrote: post #76

Earlier quoted context omitted.

They do. Try to get a Range Rover insured in the UK. You’ll struggle.

Interesting, I searched and that seems accurate, it doesn't seem to be the case here in AU though from what I've seen.

These keyless systems enable these cars to be broken into really easily. I’ve had friends see thieves operate in pairs, one by the front door, one by the car, and effectively use repeaters between the house and the car to unlock his Range Rover, and then drive away with it, in under a minute (as captured by his home security system).

The question then becomes more of a value proposition / opportunity cost. If you can steal any keyless car trivially, why wouldn’t you target the vehicles that can net you the greatest return?

Why steal a Prius when you can steal a Evoque?

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