INFORMATION PROCESSING DEVICE, METHOD, PROGRAM, AND INTEGRATED CIRCUIT

摘要

The aim is to provide high-speed data synchronization. To achieve the aim, in data synchronization using a plurality of key databases with respect to same data pieces, a key for one key database, which has been determined in advance, is used for updating the data piece managed under the other key database. This reduces the number of key decryption operations. A key management software 116, which manages a key database A120 and a key database B121 each having a tree structure, determines whether to perform data synchronization when requested by an upper-level application to perform data encryption, and performs synchronization of encrypted data by using a key of the other database which has been determined in advance. This reduces the number of times the encrypted key is loaded onto a cryptographic processing unit 114, and realizes high-speed cryptographic processing on data.