Secret key exchange in ultra-long lasers by radio-frequency spectrum coding

Tonello, Alessandro, Barthélémy, Alain, Krupa, Katarzyna, Kermène, Vincent, Desfarges-Berthelemot, Agnès, Shalaby, Badr Mohamed, Boscolo, Sonia, Turitsyn, Sergei K. and Ania-Castañón, Juan Diego (2015). Secret key exchange in ultra-long lasers by radio-frequency spectrum coding. Light, 4 (2),

Abstract

We propose a new approach to the generation of an alphabet for secret key exchange relying on small variations in the cavity length of an ultra-long fiber laser. This new concept is supported by experimental results showing how the radio-frequency spectrum of the laser can be exploited as a carrier to exchange information. The test bench for our proof of principle is a 50 km-long fiber laser linking two users, Alice and Bob, where each user can randomly add an extra 1 km-long segment of fiber. The choice of laser length is driven by two independent random binary values, which makes such length become itself a random variable. The security of key exchange is ensured whenever the two independent random choices lead to the same laser length and, hence, to the same free spectral range.

Publication DOI: https://doi.org/10.1038/lsa.2015.49
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Institute of Photonics
Engineering & Applied Sciences > Systems analytics research institute (SARI)
Additional Information: This work is licensed under a Creative Commons Attribution 3.0 Unported License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/. Funding: French National Research Agency (grants LABEX SIGMALIM and ANR 08-JCJC-0122 PARADHOQS); European Research Council (project ULTRALASER); Leverhulme Trust (grant RPG-278); Spanish MICINN project TEC2011-27314 (RAMAS); and XLIM Institute (grant VIP2013).
Uncontrolled Keywords: fiber lasers,fiber optics communications,optical security,encryption
Full Text Link: http://www.nature.com/lsa/journal/v4/n4/full/lsa201549a.html
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Published Date: 2015-04-24
Authors: Tonello, Alessandro
Barthélémy, Alain
Krupa, Katarzyna
Kermène, Vincent
Desfarges-Berthelemot, Agnès
Shalaby, Badr Mohamed
Boscolo, Sonia ( 0000-0001-5388-2893)
Turitsyn, Sergei K. ( 0000-0003-0101-3834)
Ania-Castañón, Juan Diego

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