Unconditionally secure digital signatures implemented in an eight-user quantum network

  title={Unconditionally secure digital signatures implemented in an eight-user quantum network},
  author={Yoann Pelet and Ittoop Vergheese Puthoor and Natarajan Venkatachalam and S{\"o}ren Wengerowsky and Martin Lon{\vc}ari{\'c} and Sebastian Philipp Neumann and Bo Liu and Željko Samec and Mario Stip{\vc}evi{\'c} and Rupert Ursin and Erika Andersson and John G. Rarity and Djeylan Aktas and Siddarth Koduru Joshi},
  journal={New Journal of Physics},
The ability to know and verifiably demonstrate the origins of messages can often be as important as encrypting the message itself. Here we present an experimental demonstration of an unconditionally secure digital signature (USS) protocol implemented for the first time, to the best of our knowledge, on a fully connected quantum network without trusted nodes. We choose a USS protocol which is secure against forging, repudiation and messages are transferrable. We show the feasibility of… 
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