A Protocol for the Quantum Private Comparison of Equality with χ-Type State

Author: Liu Wen   Wang Yong-Bin   Jiang Zheng-Tao   Cao Yi-Zhen  

Publisher: Springer Publishing Company

ISSN: 0020-7748

Source: International Journal of Theoretical Physics, Vol.51, Iss.1, 2012-01, pp. : 69-77

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Abstract

We present a new quantum protocol for comparing the equal information with the help of a semi-honest third party (TP). Different from previous protocols, we utilize the four-particle χ-type states as the information carriers. Various kinds of outside attacks and participant attacks are discussed in detail. One party cannot learn the other’s private information. The TP cannot learn any information about the private information, even about the comparison result or the length of secret inputs.