| 摘要 |
A CPU and an enciphering circuit are provided in a memory card with a construction of a memory stick. Data which is inputted and outputted is enciphered and stored in a flash memory. A command system for accessing the memory stick has a public command system and a non-public command system for management. In file data which is stored in the flash memory, an access restriction, copy guard information, and encipherment and a personal identification number at the time of access can be selectively set for every file data. In those file data, a data file including hidden file data manages processes. An access right is set into the file data and accesses for reading and writing the file data are restricted in accordance with the access right. Since the data is enciphered and stored in the flash memory, the security of the data to be stored is enhanced.
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