No Security Here (Score 2, Informative)

to intercept the signal, you simply tap the fiber and split a small portion of the beam into your copy of their device.

their "descrambling" method doesn't sound hard - you take the light you receive and send half through a delay loop equal to one circuit through the originating ring laser. then you compare the two signals to obtain the data.

the only eavesdropper this will thrwart is the guy who uses only intensity (and not polarization) measurements. communication using "Polaritons" has been around for a while.

the easy way is to put your light through an birefringent crystal and modulate the input voltage - this produces a change in the polarization you can read out with a simple polarizer. the problem is, when you try to change the phase on a photon fast (like for data transfer), you screw up the frequency. and by screwing up the frequency you reduce the gain of your doped fiber amplifiers and you crowd signal space for other colors (although not much, admittedly).

conclusion: this is useless for sending obscure data. hiding your data in noise is useless if everyone knows how to remove the noise.

muerte