Matsushita Electric Industrial Co., Ltd.

Hideo Oozeki

Futoshi Nakabe

Shinji Kawano

Tadakatsu Masaki

Hiromi Ebara

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

Hideo Oozeki