[OT][joke?] Re: detecting physical eavesdropping

From: RainbowHat (nHiATlE@blSackholeP.mAit.edMu.invalid)
Date: 01/26/02 

From: RainbowHat <nHiATlE@blSackholeP.mAit.edMu.invalid>
Date: Sat, 26 Jan 2002 18:47:05 +0000 (UTC)

Sorry, I think this is on topic for security but off topic for
os.linux. Maybe *.phreak.* or something.

< Jonathan Kline
<>
>Possible Options: FIBER. At least run fiber between all closets, this will
>somewhat limit the ability to sniff, as it's significantly harder to sniff
>fiber. <>

Yes, very hard (double meaning, hardware and working hard) but
mission can possible. I think optical half mirror coupler can do.
Maybe there are ?dB loss. If cut the fiber, it need to polish
the surface.

optical fiber
               / half mirror (transparent ?%)
              /
main <-------/<--------* light
node /|
           / |
             V
             sniff node

If metal twisted cable:
* Compare signal levels before and after wire-taped.
  I'm not sure how many signal levels drop using magnetic
  mutual coil.
* Compare cable impedance before and after.
* Compare error frequency in NIC firmware level.
* Observe reflect pulse off line.
* Observe reflect pulse on line.
  NIC with DSP(Digital Signal Processor). I think it's
  expensive.

 send pulse normal reflect pulse
 +-+ |
 | | v
 | |-> +-+ +-+
 | | <-| | <-| |
-+ +------+ +--------+ +----
           ^
           |
          wire-taped reflect pulse 

-- 
Best Regards,
RainbowHat. I support FULL DISCLOSURE.
I use the terms "prober", "attacker" and "intruder". Because 
a hacker said I'm just developing Linux|*BSD 20 hours per day. 
A hacker in the Hollywood movie said I'm just acting the 
scenario! A cracker said I'm researching de-cryptography. 
A script kiddies said i h4v3 n07 5ki11. i w4n4633 4 31337.
----+----1----+----2----+----3----+----4----+----5----+----6----+----7

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