| 摘要 |
A memory card receives an encrypted application program from a host apparatus. The memory card includes an Integrated Circuit (IC) card unit having a tamper resistant function, and a flash memory unit. The IC card unit also includes a tamper resistant storage unit, a program acquisition unit that acquires the encrypted application program from the host apparatus, a storage control unit which stores the acquired encrypted application program in the tamper resistant storage unit or the flash memory unit, and a move control unit. The memory control unit, when the application program stored in the tamper resistant storage unit is to be executed and the size of the application program to be executed in the decrypted form exceeds the size of free space of the tamper resistant storage unit, moves an arbitrary encrypted application program stored in the tamper resistant storage unit to the flash memory unit.
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