Re: Emulating a wireless access point

[Michael Boman <michael () ayeka dyndns org>]

On Tue, Aug 14, 2001 at 03:46:38PM -0700, Meredith S wrote:
>       Actually, it probably has to do w/ the frequency / harmonic resonance of
> the phone interfearing w/the AP ... not the proximity. Even if the phone
> operates on a different frequency, it can interfere w/ the AP via harmonic
> resonance.
>       Harmonic Resonance occurs when one of the frequencies is a multiple of the
> other. Say your AP operates at 2 hz ( for simplicity sake) and your phone
> operates at 4 hz, then every other cycle of the phones frequency will be in
> phase w/ the access points.
>
> ASCII Diagra:
> |                  x -- sine peak                 As you can see, the sine
> waves are prefectly
> |      |   |   |   |                Phone         in-phase at 2 and 4 w/
> respect to the phone.
> |     | | | | | | | |
> |        |   |   |   |
> |_________________________________ T = 1 sec
> |
> |                    x -- sine peak
> |          |       |
> |     ....| |.....| |.               Access Point
> |             | |
> |              |
> __________________________________ T = 1 sec
>
>       Are there any Ham operators out there that can confirm or deny this?
>
>  -- Meredith Shaebanyan

I am no Ham operator, but I read about this in school (studied
electrioncs, HiFi system and so on). IIRC this is correct, a higher/lower
frequency resonates every 1/2 of the currently frequency at half
the effect.


So lets say we are at 8 Hz originally, you will have your first
set of "ghosts" at 4 rep. 12 Hz at half the original effect.  Second
round of "ghosts" is at 2 and 14 Hz at a 1/4 of the original effect
and so on...

Again, it was over 5 years ago I studied or worked with this stuff.

/Mike

[rest of message truncated to save bandwith]
 
-- 
There is no such thing as a system that is secure out of the box.
Tim [Timothy M. Mullen, CIO of AnchorIS.Com] claimed earlier this
morning that he had found one at Val-Mart the other day that was
secure out of the box, but as it turns out that was a Nintendo.

-- Jesper M Johansson, Ph.D. Assistant Professor of Information
   Systems at Boston University - during a SANS audio broadcast

----------------------------------------------------------------------------
This list is provided by the SecurityFocus Security Intelligence Alert (SIA)
Service. For more information on SecurityFocus' SIA service which
automatically alerts you to the latest security vulnerabilities please see:
https://alerts.securityfocus.com/