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In this paper, we propose a novel semiquantum private comparison (SQPC)protocol based on Bell states, which enables one quantum user and one classicaluser to compare the equality of their private inputs with the help of asemi-honest quantum third party (TP). TP is assumed to be semi-honest in thesense that she may take all possible attacks to steal users' private inputsexcept conspiring with anyone. The security analysis validates that ourprotocol can resist not only the attacks from internal participants but alsothe attacks from an external eavesdropper. Besides, our protocol only asks TPto perform Bell basis measurements but doesn't need quantum entanglementswapping; and it releases the classical user from conducting quantummeasurements and having a quantum memory. Moreover, our protocol can takeadvantage over previous SQPC protocols based on Bell states in qubitefficiency. Finally, our protocol can be generalized into its counterpart ofthe collective-dephasing noise quantum channel.

Semiquantum private comparison based on Bell states without quantum measurements from the classical user