DATA STORAGE DEVICE, MANAGEMENT SERVER, INTEGRATED CIRCUIT, DATA UPDATE SYSTEM, ELECTRIC HOUSEHOLD APPLIANCE, DATA UPDATE METHOD, ENCRYPTION METHOD, AND ENCRYPTION/DECRYPTION KEY GENERATION METHOD

摘要

PPROBLEM TO BE SOLVED: To safely and effectively update software of electric household appliances. PSOLUTION: In the electric household appliance 100 in which currently used data is to be updated to new data, a receiving unit 140 receives encrypted new data and a serial number of data to be updated. A key generating unit 112 generates a key by executing a predetermined irreversible calculation on the unique information correlated to the currently used data by a number of times based on the serial number of the data to be updated. An update unit 113 decrypts the new data by using the key. PCOPYRIGHT: (C)2008,JPO&INPIT