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

Alessandro Tonello, Alain Barthélémy, Katarzyna Krupa, Vincent Kermène, Agnès Desfarges-Berthelemot, Badr Mohamed Shalaby, Sonia Boscolo, Sergei K. Turitsyn, Juan Diego Ania-Castañón

Research output: Contribution to journalArticle

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.
Original languageEnglish
Article numbere276
Number of pages5
JournalLight
Volume4
Issue number2
Early online date27 Jan 2015
DOIs
Publication statusPublished - 24 Apr 2015

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radio frequencies
coding
Fiber lasers
fiber lasers
Lasers
alphabets
lasers
random variables
Random variables
seats
cavities
fibers
Fibers

Bibliographical note

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).

Keywords

  • fiber lasers
  • fiber optics communications
  • optical security
  • encryption

Cite this

Tonello, A., Barthélémy, A., Krupa, K., Kermène, V., Desfarges-Berthelemot, A., Shalaby, B. M., ... Ania-Castañón, J. D. (2015). Secret key exchange in ultra-long lasers by radio-frequency spectrum coding. Light, 4(2), [e276]. https://doi.org/10.1038/lsa.2015.49
Tonello, Alessandro ; Barthélémy, Alain ; Krupa, Katarzyna ; Kermène, Vincent ; Desfarges-Berthelemot, Agnès ; Shalaby, Badr Mohamed ; Boscolo, Sonia ; Turitsyn, Sergei K. ; Ania-Castañón, Juan Diego. / Secret key exchange in ultra-long lasers by radio-frequency spectrum coding. In: Light. 2015 ; Vol. 4, No. 2.
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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.",
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Tonello, A, Barthélémy, A, Krupa, K, Kermène, V, Desfarges-Berthelemot, A, Shalaby, BM, Boscolo, S, Turitsyn, SK & Ania-Castañón, JD 2015, 'Secret key exchange in ultra-long lasers by radio-frequency spectrum coding', Light, vol. 4, no. 2, e276. https://doi.org/10.1038/lsa.2015.49

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.; Ania-Castañón, Juan Diego.

In: Light, Vol. 4, No. 2, e276, 24.04.2015.

Research output: Contribution to journalArticle

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AU - Barthélémy, Alain

AU - Krupa, Katarzyna

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AU - Desfarges-Berthelemot, Agnès

AU - Shalaby, Badr Mohamed

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AU - Turitsyn, Sergei K.

AU - Ania-Castañón, Juan Diego

N1 - 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).

PY - 2015/4/24

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N2 - 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.

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Tonello A, Barthélémy A, Krupa K, Kermène V, Desfarges-Berthelemot A, Shalaby BM et al. Secret key exchange in ultra-long lasers by radio-frequency spectrum coding. Light. 2015 Apr 24;4(2). e276. https://doi.org/10.1038/lsa.2015.49