PORTABLE BODY USED IN TWO WAY, COMMUNICATION SYSTEM, COMMUNICATION METHOD, TERMINAL, COMPUTER-READABLE RECORDED MEDIUM ON WHICH PROGRAM IS RECORDED

摘要

An integrated device of an IC card (1) has a nonvolatile memory (12) accessed by electric power of when a portable body is placed in a radio wave zone of the radio wave radiated from a terminal and eletric power is fed from the antenna of the terminal, a cryptography circuit (10) for carrying out two-way authentication in cooperation with a first terminal, a nonvolatile memory (13) accessed by electric power of only when a portable body is placed near to the antenna of the terminal and larger electric power is fed from the antenna of the portable body, and a cryptography circuit (11) for carrying out two-way authentication in cooperation with the first terminal. Personal information required to be of strict secrecy is stored in the nonvolatile memory (13), and the two-way authentication necessary when the nonvolatile memory (13) is accessed is carried out by means of the cryptography circuit (11), thereby the protection of personal information is perfect.