Participant Attack on Three-party Quantum key Agreement with Two-photon Entanglement

In a recent study (Yin et al. Int. J. Theor. Phys. 52, 3915-3921, 2013), Yin et al. proposed a three-party quantum key agreement protocol based on two-qubit entangled states, they claimed that the protocol could resist against the insider attack and each party in the protocol has an equal contribution to the establishment of the final shared secret key. However, in this study, we will show that the protocol is not secure, two dishonest participants can conclude to determine the shared key alone. To avoid this flaw, a further improved protocol is proposed.

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