Yasuo Iijima

Mutual authentication system and method which checks the authenticity of a device before transmitting authentication data to the device

Portable electronic device with garbage collection function

Portable electronic device supporting multi-protocols

Portable electronic device with plural memory areas

Data transmission system using electronic apparatus having a plurality of transmission protocols

System for mutually certifying an IC card and an IC card terminal

Mutual authentication system

Data writing system for EEPROM

Portable electronic apparatus having key data for limiting memory access

METHOD AND SYSTEM FOR ALLOCATING FILE AREA IN MEMORY AREA OF IC CARD