IC CARD AND METHOD OF USING IC CARD

摘要

After the initialization, a cipher key writing control unit (48) permits a cipher key memory unit (36) to write a cipher key only once. Similarly, after the initialization, a specific data writing control unit (42) permits a data memory unit (34) to write specific data only once. Thus, the cipher key and the specific data can be written by a person other than the IC card manufacturer after the IC card is manufactured, so that the flexibility in the use of the IC card can be ensured. Further, since it is prohibited to rewrite the written data, false usage of the card can be avoided. Moreover, the IC card manufacturer can initialize the data memory unit (34) and the cipher key memory unit (36) by a data initialization unit (44) and a cipher key initialization unit (46). Therefore, the IC card can be re-used, and the cost of the IC card can be lowered.