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Article Dans Une Revue Light: Science and Applications Année : 2015

Secret key exchange in ultralong lasers by radiofrequency spectrum coding

Alessandro Tonello
Alain Barthélémy
Katarzyna Krupa
  • Fonction : Auteur
  • PersonId : 920962
Vincent Kermène
Agnès Desfarges-Berthelemot
Badr Mohamed Ibrahim Shalaby
  • Fonction : Auteur
  • PersonId : 920967
Juan Diego Ania-Castañón
  • Fonction : Auteur

Résumé

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.
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hal-01216421 , version 1 (11-04-2024)

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Alessandro Tonello, Alain Barthélémy, Katarzyna Krupa, Vincent Kermène, Agnès Desfarges-Berthelemot, et al.. Secret key exchange in ultralong lasers by radiofrequency spectrum coding. Light: Science and Applications, 2015, 4 (4), pp.e276. ⟨10.1038/lsa.2015.49⟩. ⟨hal-01216421⟩
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