Bandwidth controlled multi-party joint data processing methods and apparatuses

Abstract

Bandwidth-controlled, private, multi-party joint data processing is described. When performing an niteration of joint data processing on service data, multiple participants separately determine a same nidentifier at the current iteration and includes sub-identifiers separately corresponding to service data of the multiple participants. The multiple participants are enabled to separately determine their respective random arrays in a predetermined trusted interaction manner and based on the nidentifier and initial seeds of the multiple participants. When a first sub-identifier exists in a correspondence between sub-identifiers and confidential data, the multiple participants separately obtain first confidential data corresponding to the first sub-identifier and perform the current iteration of joint data processing with another participant using secure multi-party computation (MPC) based on exchange of other confidential data and respective first confidential data. The first confidential data is obtained by fusing first service data and a corresponding first random number.