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Quantum Information Processing

New quantum private comparison protocol using EPR pairs

Hsin-Yi Tseng, Jason Lin, Tzonelih Hwang

Published Jun 4, 2011• 225 citations
Publisher
DOI
10.1007/s11128-011-0251-0

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In this paper, we carry out an in-depth analysis of the quantum private comparison (QPC) protocol with the semi-honest third party (TP). The security of QPC protocol using the EPR pairs is re-examined. Unfortunately, we find that TP can use the fake EPR pairs to steal all the secret information. Furthermore, we give two simple and feasible solutions to improve the original QPC protocol. It is shown that the improved protocol is secure, which can resist various kinds of attacks from both the outside eavesdroppers and the inside participants, even the semi-honest TP.
We propose a Quantum private query (QPQ) protocol based on device-independent Quantum key distribution (QKD) by using Einstein-Podolsky-Rosen (EPR) pairs. We analyze coherent attacks by a third party in a weaker constraints (non-signaling condition) compared with the formalism of quantum physics. We deduce the relationship between the raw key bits of Alice and the third party's attack factor. Compared with existing QPQ protocols, our protocol is secure even when the source and measuring equipment used to distribute oblivious secret key can not be trusted. Quantum register is not needed in our protocol.