Cryptanalysis of a Practical Quantum Key Distribution with  Polarization-Entangled Photons (pp181-186)
         Thomas Beth, Jorn Muller-Quade, and Rainer Steinwandt
          doi: https://doi.org/10.26421/QIC5.3-1
Abstracts: Recently, a quantum key exchange protocol has been described\cite{PFLM04}, which served as basis for securing an actual bank transaction by means of quantum cryptography \cite{ZVS04}. The authentication scheme used to this aim has been proposed by Peev et al. \cite{PML04}. Here we show, that this authentication is insecure in the sense that an attacker can provoke a situation where initiator and responder of a key exchange end up with different keys. Moreover, it may happen that an attacker can decrypt a part of the plaintext protected with the derived encryption key.
Key words: Quantum key exchanges, authentication, cryptanalysis