W-state-based Semi-quantum Private Comparison

Semi-quantum private comparison, which authorizes two classical participants to compare the equality of their private information with the cooperation of a semi-honest third party without unveiling privacy. The W-state is more robust against the loss of any single qubit than the GHZ state. In this paper, an efficient and secure semi-quantum private comparison protocol based on W-state is proposed for the first time. The qubit efficiency comparison shows the proposed protocol is more efficient than the similar literature. Moreover, the security of the devised protocol concerning various kinds of outside attack and inside attack is discussed. The security analysis demonstrates that outside eavesdropper, inside dishonest participant and semi-honest third party cannot obtain any private information.