Re: RF code scanners

From: Mister Coffee (live4java_at_stormcenter.net)
Date: 06/23/04

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    Date: Wed, 23 Jun 2004 11:02:47 -0700
To: "Ng, Kenneth (US)" <kenng@kpmg.com>

    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=467
    > > > Openers 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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