Re: Re: Serious flaws in bluetooth security lead to disclosure of personal data

["Kurt Seifried" <listuser () seifried org>]

> Kurt Seifried wrote:
> > Actually there are three classes of bluetooth:
> >
> >  Class 3 with with 0 dBm (1 mW), 100M or so range (usually as a seperate
> > dongle, not many devices have this capability built in as it eats
batteries,
> > however several "base station" products do it).
> >
> > Class 2 with 4 dBm (2.5 mW), 10M or so range (the "usuall" one)
> >
> > Class 1 with 20 dBm (100 mW) 10cm range (i.e. physically next to
something).
> >
> [...]
>
> Ummm, why does the range go down as the power goes up?  Should there be
> "-" signs in front of those dBm values?  Or are they listed in the wrong
> order?  100 mW should get you a lot farther than 10 cm if you have any
> antenna at all.

Ooops. Got it backwards. Well.. One of the three is right =).

P.S. I'm getting dozens of bounces for each message, Len, you may want to
send out a vacation troller and unsubscribe the various lists/dead accounts
on this list.


Kurt Seifried, kurt () seifried org
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http://seifried.org/security/
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