SECURE SURVIVAL TIME DATA PROCESSING SYSTEM, SECURE SURVIVAL TIME DATA PROCESSING DEVICE, SECURE SURVIVAL TIME DATA PROCESSING METHOD, AND PROGRAM

摘要

The present invention provides a technology for computing the number of survivals and the number of deaths while concealing survival time data. This secure survival time data processing system comprises: a group data position computation means that computes, from shares [[g]] of columns g of values of groups of survival time data included in a survival time data set D, a share [[g^A]] of a column g^A and a share [[g^B]] of a column g^B represented by a predetermined expression; a number-of-group data computation means that computes, from shares [[t]] of columns t of values of times of the survival time data included in the survival time data set D, the share [[g^A]], and the share [[g^B]], a share [[s^A]] and a share [[s^B]] by [[s^A]] = GroupSum([[g^A]], [[t]]), and [[s^A]] = GroupSum([[g^B]], [[t]]); and a number-of-survivals computation means that computes, from the share [[s^A]] and the share [[s^B]], a share [[n^A]] and a share [[n^B]].