Abstract
In this paper, a quantum private comparison (QPC) protocol based on five-particle cluster state is proposed. In our protocol, two parties can compare the equality of their secrets with the help of a semi-honest third party (TP), who is allowed to misbehave on his own but will not conspire with either of the two parties. Our protocol utilizes the single-particle measurement and Bell measurement. It is easy to implement for current technologies. The security of our protocol with respect to both outsider attack and participant attack is also discussed. Any information about the private information, and the comparison result will not be leaked out, even the third party cannot know these information.
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