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Recently, a quantum multi-party summation protocol based on the quantumFourier transform has been proposed [Quantum Inf Process 17: 129, 2018]. Theprotocol claims to be secure against both outside and participant attacks.However, a closer look reveals that the player in charge of generating therequired multi-partite entangled states can launch two kinds of attacks tolearn about other parties' private integer strings without being caught. Inthis paper, we present these attacks, and propose countermeasures to make theprotocol secure again. The improved protocol not only can resist these attacksbut also remove the need for the quantum Fourier transform and encoding quantumoperations by participants.

Improvements on "Secure multi-party quantum summation based on quantum Fourier transform"