2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/105380I 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.Comments and/or opinions are welcome and encouragedQuantum Physicstext