Secret key exchange in ultralong lasers by radiofrequency 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

doi:10.1038/lsa.2015.49

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Secret key exchange in ultralong lasers by radiofrequency spectrum coding

Original Articles

- Secret key exchange in ultralong lasers by radiofrequency spectrum coding
- Light: Science & Applications Vol. 4, Issue 2, (2015)
- Affiliations：
  
  1.Université de Limoges, XLIM, UMR CNRS 7252, 123 Avenue A. Thomas, Limoges 87060, France
  2.Physics Department, Faculty of Science, Tanta University, Tanta, Egypt
  3.Aston Institute of Photonic Technologies, Aston University, Birmingham B4 7ET, UK
  4.Instituto de Óptica, CSIC, C/Serrano 121, Madrid 28006, Spain
- Author bio：
  
  Dr S Boscolo, Aston Institute of Photonic Technologies, Aston University, Birmingham B4 7ET, UK Email: s.a.boscolo@aston.ac.uk
- Funds：
- DOI：10.1038/lsa.2015.49
  CLC：
- Published：2015-06，
  
  Published Online：27 January 2015，
  
  Received：10 October 2014，
  
  Revised：21 January 2015，
  
  Accepted：26 January 2015
- Accepted：
Scan QR Code
Tonello, A. et al. Secret key exchange in ultralong lasers by radiofrequency spectrum coding. Light: Science & Applications, 4, e276 (2015).
DOI：

Tonello, A. et al. Secret key exchange in ultralong lasers by radiofrequency spectrum coding. Light: Science & Applications, 4, e276 (2015). DOI： 10.1038/lsa.2015.49.

摘要

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 ultralong fiber laser. This new concept is supported by experimental results showing how the radiofrequency 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.

关键词

Keywords

fiber lasersfiber optics communicationsoptical security and encryption

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