摘要：This paper deals with the problem in which users require to compute a set which only have elementsof which frequency is greater than or equal to a threshold value while keeping their private multisetsfrom other users secret. To this end, we use as a main cryptographic tool, commutative encryption toaddress the privacy issue in this problem. Commutative encryption allows to protect the elements of setsfrom being revealed to others while preserving its computational efficiency. Further, we apply the Bloomfilter to improve the transmission amount between users during execution of the protocol.
