Set operation method for protecting privacy

摘要

PURPOSE: A group calculation method for protecting privacy is provided to protect the privacy of each participation module by preventing elements from being exposed from other participation modules. CONSTITUTION: Shuffled tuples are acquired by enabling each participation module to group preserving protocols(S11). The participation modules eliminates plain text including zero value from the acquired tuples(S12). The participation modules determine a union of the tuples. The participation modules transmit the determined union to other participation modules(S13). The participation module decodes elements which belong to the participation module from the elements of the group(S17).