Penetration Testing mailing list archives
RE: RF code scanners
From: "Ng, Kenneth (US)" <kenng () kpmg com>
Date: Wed, 23 Jun 2004 15:06:26 -0400
Depends on how cheaply the unit was designed. I remember putting in back to back diodes on the front gates to protect against stuff like static discharge. If this was done, you would have to generate a HELL of a lot of EMF to blow these out. Time to bring out the van-de-graf generator :-). But in this era of cheaper cheaper cheaper, I bet these aren't there anymore. What will probably happen is you'll DOS the box. The AGC on the front end will try to cut the signal back as far as it can, probably not enough, the decoders won't see a clear signal/sequence, so will probably fail to engage. But I wouldn't be surprised if you burned out a front end. -----Original Message----- From: Mister Coffee [mailto:live4java () stormcenter net] Sent: Wednesday, June 23, 2004 2:03 PM To: Ng, Kenneth (US) Cc: 'Mister Coffee'; Richard Rager; Amit Deshmukh; pen-test () securityfocus com Subject: Re: RF code scanners On Wed, Jun 23, 2004 at 08:58:38AM -0500, Ng, Kenneth (US) wrote:
Safe is tricky. Electronic door locks are supposed to fail open in case
of
fire or power failure.
That depends on the specific type of lock. Yes, many of them do fail-unlocked in case of power failure. But many of them, particularly in Exterior Facing situations will fail locked, but have a physical "safety bar" release on the inside. That solves the safety needs. Garage doors, gates, etc, are a different animal. Most electric garage doors I've encountered (and gates) can't be opened during a powerfailure without either physically forcing the device, or entering the garage and pulling a manual release lever. My curiosity here isn't how they'll behave in the case of power outage, but what happens when you overload the receiver's front end with 100+ * normal signal. Do they blow chunks and open? Simply reset and go silent for a while? Or make a premature trip to Silicon Heaven. Cheers, L4J
-----Original Message----- From: Mister Coffee [mailto:live4java () stormcenter net] Sent: Friday, June 18, 2004 12:38 PM To: Richard Rager Cc: Amit Deshmukh; pen-test () securityfocus com Subject: Re: RF code scanners On Thu, Jun 17, 2004 at 05:19:09PM -0600, Richard Rager wrote:On Thu, 17 Jun 2004, Mister Coffee wrote:That depends on what you're trying to do. Side note:http://www.radioreference.com/modules.php?name=News&file=article&sid=467Openers are decidedly susceptible to jamming...All FCC class C devices are susceptible to jamming. Look at wireless
alarm systems.I wonder how many of these devices are designed to "Fail Open" when their receivers are overwhelmed. I don't imagine it would take much power to completely overload the front end of most garage door openers and the
like.
The "safe" way would be to "fail closed" of course, but we all know how security conscious most of the manufacturers out there are. Cheers, L4J
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Current thread:
- RF code scanners Amit Deshmukh (Jun 16)
- Re: RF code scanners Mister Coffee (Jun 17)
- Re: RF code scanners Richard Rager (Jun 17)
- Re: RF code scanners Mister Coffee (Jun 22)
- Re: RF code scanners Richard Rager (Jun 17)
- Re: RF code scanners Richard Rager (Jun 17)
- <Possible follow-ups>
- Re: RF code scanners Maarten Van Horenbeeck (Jun 21)
- RE: RF code scanners Ng, Kenneth (US) (Jun 23)
- Re: RF code scanners Mister Coffee (Jun 24)
- RE: RF code scanners Ng, Kenneth (US) (Jun 23)
- Re: RF code scanners Mister Coffee (Jun 27)
- Re: RF code scanners Mister Coffee (Jun 17)