This looks interesting, but
only for a point to point connection. Which means that with my fiber to
the home, I cannot send new extra sneaky messages to my neighbors.
Especially since I am on switched ethernet over fiber and I probably
can't afford the hardware.
I took a quick look through the document, and I am sure I missed most
of it, but off hand I don't see how you get past any network device or
repeater (assuming that the repeater is not repeating noise).
A
method for secure communications over a public fiber-optical network
Abstract
We develop a spread-spectrum based approach to secure communications
over existing fiber-optical networks. Secure transmission for a
dedicated user is achieved by overlaying a covert channel onto a host
channel in the existing active fiber link. The covert channel is
optically encoded and temporally spread, and has average power below
the noise floor in the fiber, making it hidden for a direct detection
thus allowing for cryptographic and steganographic security
capabilities. The presence for the host channel in the network provides
an ad hoc security expansion and increases the difficulty for an
eavesdropper to intercept and decode the secure signal.
Thursday, October 12, 2006
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