Great Circle Associates Firewalls
(October 1996)

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Subject: Re: Can fibre-optic be tapped???
From: Todd Graham Lewis <lists @ reflections . mindspring . com>
Date: Thu, 31 Oct 1996 22:04:36 -0500 (EST)
To: Eric Vanuska <vanuskae @ halsp . hitachi . com>
Cc: firewalls @ GreatCircle . COM
In-reply-to: <32794096 . 18C @ halsp . hitachi . com>

On Thu, 31 Oct 1996, Eric Vanuska wrote:

> The person tapping the line can easily cut through
> too much material and easily damage the fiber,
> causing a complete outage.  And even if done 
> correctly, there will be increased signal loss.
> This signal loss may be high enough to halt the link,
> but that will depend on alot of variables.

It would almost definitely cause enough attenuation to change the profile 
on the link.

Incidentally, this is how Georgia Tech finally solved the problem of
people stealing letters off of the "Tech" sign on the main building; they
wrapped them end to end in fiber, and any change in the signal through the
fiber brings security running. 

Whereas this used to be a regular event, not one of the four letters has
been stolen since. 

Todd Graham Lewis             Linux!                 Core Engineering
Mindspring Enterprises  tlewis @
 mindspring .
 com   (800) 719 4664, x2804

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