Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Hiromi Ebara

Futoshi Nakabe

Shinji Kawano

Tadakatsu Masaki

Hideo Oozeki

A semiconductor memory card that has a sufficient storage capacity when an EC application writes data to a storage is provided. A usage area for the EC application in an EEPROMin a TRMis expanded. The expansion is such that a partition generated in a flash memoryoutside the TRMis assigned to the EC application while a partition table is allocated in the internal EEPROM. Because the partition table is in the TRM, only a CPUin the TRMis able to access the generated partition table. Secrecy of stored contents increases because the access to the expanded area is limited to the CPUin the TRM

Semiconductor memory card, and program for controlling the same

A semiconductor memory card that has a sufficient storage capacity when an EC application writes data to a storage is provided. A usage area for the EC application in an EPPROMin a TRMis expanded. The expansion is such that a partition generated in a flash memoryoutside the TRMis assigned to the EC application while a partition table is allocated in the internal EEPROM. Because the partition table is in the TRM, only a CPUin the TRMis able to access the generated partition table. Secrecy of stored contents increases because the access to the expanded area is limited to the CPUin the TRM

The memory card with a simple configuration is provided with more reliable security. When the memory card receives the access request to the memory from the external connecting device, the access unit accesses the memory based on the access request. At this time, the switch composing the memory card indicates the propriety of the access right to the memory, and the access limitation unit limits that the access unit accesses the memory.

Memory card

This invention provides a reader/writer, ID method and program comprising a response-detection unit of detecting normal responses and collisions from IC cards in response to a request; and a response-invalidation unit of sending a response-invalidation command, which is a command not to respond to requests in the future, to IC cards that sent normal responses when the response-detection unit received normal responses from IC cards even though collisions were detected.

IC card reader/writer, identification method and program

The contactless IC card, the responding method, and the program that control the collision of response to the minimum, wherein the response judgment unit judges whether there is an initial response of the other contactless IC card at a specific time, and the response slot changing unit change the specific time based on the judgment result of the response judgment unit.

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Hiroshima, Japan

Hiromi Ebara