A Novel Protocol-Authentication Algorithm Ruling Out a Man-in-the-Middle   Attack in Quantum Cryptography
  In this work we review the security vulnerability of Quantum Cryptography with respect to "man-in-the-middle attacks" and the standard authentication methods applied to counteract these attacks. We further propose a modified authentication algorithm which features higher efficiency with respect to consumption of mutual secret bits. 
M. Peev, M. N\"olle, O. Maurhardt, T. Lor\"unser, M. Suda, A. Poppe,   R. Ursin, A. Fedrizzi and A. Zeilinger