A secure quantum multi-party ranking protocol based on continuous variables

Abstract

A secure quantum multi-party ranking protocol based on continuous variables is proposed. We first propose a secure quantum three-party ranking protocol based the continuous-variable GHZ state, and then extend the protocol to a secure quantum multi-party ranking protocol. The trusted center (TC) can compute the order of the secret input while not knowing the secret input and order of the parties, and each party only knows the order of his own input but doesn’t know the other parties’ inputs and orders. Finally, the security analysis results show that it satisfies the basis security requirement of a quantum secure ranking protocol, such as correctness, anonymity, untraceability and security, where the security requirement of anonymity, untraceability and security are analyzed from two aspects: the outsider attack and the participants attack.