Eavesdropping on Blind Quantum Key Distribution through a Labeling   Attack
  I present an eavesdropping on the protocol proposed by W.-H. Kye, et al. [Phys. Rev. Lett. 95, 040501 (2005)]. I show how an undetectable Eve can steal the whole information by labeling and then measuring the photons prepared by the user Alice. 
Marco Lucamarini