The YY2018 quantum summation protocol lets the state-preparing party P1 steal other parties' secret integers, and the proposed countermeasure adds entanglement checks; one of the two attacks is new, but the security analysis has gaps.
F.: Quantum-classical complexity-security tra deoff in secure multiparty com- putations
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Improvements on "Secure multi-party quantum summation based on quantum Fourier transform"
The YY2018 quantum summation protocol lets the state-preparing party P1 steal other parties' secret integers, and the proposed countermeasure adds entanglement checks; one of the two attacks is new, but the security analysis has gaps.