mery <[EMAIL PROTECTED]>
CC: <[EMAIL PROTECTED]>
Subject: Re: Using time-domain reflectometry to detect tamper attempts on
telecom cables
Date: Sat, 8 Mar 2003 07:39:36 +0100 (CET)
>But getting the bits from under the ocean somewhere back to
> Fort Meade without being detected mus
> But getting the bits from under the ocean somewhere back to
> Fort Meade without being detected must be more interesting.
Can't they hire their own fiber in the cable, splice it, and feed the
preprocessed data in there?
> It probably is true that the right wavelength laser will
> penatrat
At 12:49 PM 3/7/03 -0600, Harmon Seaver wrote:
> I'm sure I read about a way to do fiber, or that someone had
developed a
>device, that only involved removing a bit of the covering, not cutting
into the
>fiber at all.
Evanescent waves.
A *lot* easier to 0wn the landing points, and technicians w
On Fri, Mar 07, 2003 at 02:38:56PM -0500, Tyler Durden wrote:
>
> Undersea, I've heard that NSA uses splices, and that NSA has its own sub
> for that purpose. (And the company I used to work for did some work on
> undersea NSA optical projects, so I tend to believe the rumors I heard
> there.)
I'm sure I read about a way to do fiber, or that someone had developed
a
device, that only involved removing a bit of the covering, not cutting into
the
fiber at all.
Yes, there is such a device, and I've used one. The only problem with them
is that the amount of attenuation that results fro
On Fri, Mar 07, 2003 at 11:33:32AM -0500, Sunder wrote:
>
> Not sure what the NSA would do to tap fibers, certainly tempest wouldn't
> work - except if there are repeaters nearby - or if they actually cut into
> the fibre to splice it.
I'm sure I read about a way to do fiber, or that someone h
Time to time, usually when it appears on Cryptome, I skim through the
revisions of Wassenaar agreement lists of controlled technologies. It's a
neat way to keep myself up to date with what technologies are available on
the market and the approximate degree of security they offer.
One of the contro
Well, I can only speak about OTDRs.
Maybe it could be possible to build a dedicated TDR system intended to be
connected to installed cablings, periodically test the cables by sending
pulses along them and watch what returns, compare the result with
long-term average, and report differences.
This
