Yes fiber is tappable, and it's nothing new. I was trained to do that
in 1984 in a class given by a contractor/other gvt. guys. The easiest
way to do this is simply by plugging into a F.O. hub with available ports.
The other way is to polish some of the cladding off, and epoxy this to the
side of another polished fiber. It takes practice, just like polishing ends.
Your receiver has to be very sensitive (high Rset). Look for a point-to-point
fiber with few connectors and no passive stars which will cause attenuation,
and most likely the flux budget of the fiber link will be be able to afford a
little loss. This works well with 62.5/125 multimode fiber, but not with
singlemode. BTW if attenuation-monitored link is only between an active hub
(star) and the CPU, another port on that star will not affect the Db loss of
that link.
The science of spying is much more advanced than people think. Probably
today the 'pros' are using 'squid' devices to clamp on a fiber. Squid devices
are very sensitive to energy, and are used in Satellite, Plane, ship, sub,
and handheld devices. They are used in devices to watch people inside
buildings(from the outside and high above), and examine crowds to view body
energy which backlights any weapons concealed. Think of it as night vision
and x-ray vision combined.
Ain't this a little extreme of a concern for firewalls? Maybe we should stop
this thread (now that I had a chance to share my gossip). ;)
Bill Stout
_______________________________________________________________________________
Senior Systems Admin NT/Solaris/WWW/Firewalls/Routers/Mainframe_UNIX
Hitachi Data Systems 408-970-4822 --- Disclaimer: I speak only for myself
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