Privacy-protected method, device and system for determining common data

• Main Authors: DU JIAN, LU YUFEI, ZHANG LEI, CUI JINMING, DUAN PU
• Format: Patent
• Language: Chinese; English
• Published: 10.06.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; DATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FORADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORYOR FORECASTING PURPOSES; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE,COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTINGPURPOSES, NOT OTHERWISE PROVIDED FOR

The embodiment of the invention provides a method, a device and a system for determining common data and protecting privacy. And the first party encrypts the first data set held by the first party by using the first key, and sends the obtained single encrypted full data set to the second party. And the second party encrypts the single-encrypted full data set again by using the second key to obtain a double-encrypted full data set, performs down-sampling and single encryption based on the second key on the basis of the second data set of the second party to obtain a single-encrypted sampling data set, and sends the single-encrypted sampling data set to the first party. The first party encrypts the single-encrypted sampling data set by using the first key to obtain a double-encrypted sampling data set, and determines an intersection of the double-encrypted full data set and the double-encrypted sampling data set; in addition, a complementary set except the intersection in the double-encrypted sampling data set