Method and apparatus for securing fiber in an optical network

Details Method and apparatus for securing fiber in an optical network Method and apparatus for securing fiber in an optical network

2004-07-15

2009-02-17

Pascal, Leslie (Department: 2613)

Optical communications

Eavesdropping

C398S033000

Reexamination Certificate

active

07493040

ABSTRACT:
A method and apparatus for securing an optical communication link includes the step of identifying a profile of the link by measuring, at the transmitter, optical back-reflections from optical pulses forwarded to a receiver. The profile is stored at the transmitter. Periodically during operation, such as during key exchange, more optical pulses are forwarded to the receiver, and the back reflections are collected as periodic profiles. The periodic profiles are compared against the stored profiles. Eavesdroppers, such as those who cut the fiber, tap the fiber, or implement a man in the middle attack, may be easily identified because the losses caused by their interference with the fiber will be evident in the periodic profiles.

REFERENCES:
patent: 5453865 (1995-09-01), Faulkner et al.
patent: 6519026 (2003-02-01), Holland
patent: 2004/0047629 (2004-03-01), Evangelides et al.
patent: 402264527 (1990-10-01), None
Mullins, Making Unbreakable Code, IEEE Spectrum, May 2002, pp. 40-45.

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