SHARED INFORMATION MANAGEMENT SYSTEM, SHARED INFORMATION MANAGEMENT METHOD AND SHARED INFORMATION MANAGEMENT PROGRAM

摘要

PROBLEM TO BE SOLVED: To accurately verify validity of shared information that is arranged in a sharing manner.;SOLUTION: A shared information management system comprises: multiple shared information retention units 3 for calculating aggregated signature information B by aggregating signature information, and for, when aggregated signature information A that is preliminarily transmitted from a sharing unit is equal to the aggregated signature information B, determining shared information, which is transmitted from the sharing unit, as information to be retained; and a shared information unit 2 for acquiring each shared information to be retained from each of the different shared information retention units, and for, when the shared information number is equal to or more than a certain number, if a preset verification formula including the signature information has a bilinear property, restoring secret information based on the shared information acquired from each of the shared information retention units.;COPYRIGHT: (C)2013,JPO&INPIT