A multi-party semi-quantum unidirectional private comparison protocol based on quantum private query

Most existing research on quantum privacy comparison protocols focuses on two-party privacy comparison. However, when multiple parties hold the same private information and want to compare it with another party, it is necessary to repeatedly execute the protocol between each participant and the data provider being compared. The bidirectional characteristics of the existing protocol make it difficult to meet the unidirectional comparison needs in specific scenarios. To address the above problems, this study proposes a multi-party semi-quantum unidirectional private comparison protocol based on quantum private query. It is based on Bell states and does not require TP, and the users who know the comparison results have complete quantum capabilities, which reduces the difficulty of protocol implementation. In addition, the security analysis shows that the protocol can effectively prevent data leakage associated with sensitive information and ensure privacy.