Quantum private comparison of equality protocol without a third party

Authors:
Jason Lin;Chun-Wei Yang;Tzonelih Hwang
Affiliations:
Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan City, Taiwan, ROC 70101;Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan City, Taiwan, ROC 70101;Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan City, Taiwan, ROC 70101
Venue:
Quantum Information Processing
Year:
2014

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Abstract

This paper presents a novel quantum private comparison protocol that uses Einstein---Podolsky---Rosen pairs. The proposed protocol allows two parties to secretly compare their information without exposing their actual contents. The technique of entanglement swapping enables the comparison to be achieved without the help of a third party. Moreover, because the proposed protocol employs one-step transmission and decoy photons, it is secure against the various quantum attacks in existence thus far.