Program, classification method and system

• Main Authors: SAKUMA JUN, URAMOTO NAOHIKO
• Format: Patent
• Language: English
• Published: 12.10.2010
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; PHYSICS; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

A system and method classifies multiple pieces of private data owned by multiple entities according to data type. Each of the entities has an encryption key. A representative entity is selected that is representative of the entities owning data of the type. Data of each of the representative entity and a target entity is encrypted and the encrypted data is exchanged between the entities. Each piece of the encrypted data that the target entity has obtained is re-encrypted by using its own encryption key to obtain data 1, and the encrypted data that the representative entity has obtained is re-encrypted by using its own encryption key to obtain data 2. If data 1 of the representative entity matches data 2, it is determined that the representative entity and the target entity have data of an identical type.