Device-independent security of quantum cryptography against collective attacks.

  title={Device-independent security of quantum cryptography against collective attacks.},
  author={Antonio Ac{\'i}n and Nicolas Brunner and Nicolas Gisin and Serge Massar and Stefano Pironio and Valerio Scarani},
  journal={Physical review letters},
  volume={98 23},
We present the optimal collective attack on a quantum key distribution protocol in the "device-independent" security scenario, where no assumptions are made about the way the quantum key distribution devices work or on what quantum system they operate. Our main result is a tight bound on the Holevo information between one of the authorized parties and the eavesdropper, as a function of the amount of violation of a Bell-type inequality. 

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Quantum Inform

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