An IC card 1 (portable card) having an integrated device. The IC card
1
includes a nonvolatile memory 12 and an encryption circuit 10.
The nonvolatile memory 12 is accessed after the IC card 1 is placed
in a radio wave zone to receive a power supply from a terminal apparatus through
a radio wave. The encryption circuit 10 coordinates with a first terminal
apparatus to perform a mutual authentication. The integrated device includes a
nonvolatile memory 13 and an encryption circuit 11. The nonvolatile
memory 13 is accessed after the IC card 1 is placed at a location
close to an antenna in the first terminal apparatus and only after the IC card
1 receives a higher-level power supply from the antenna. The encryption
circuit 11 coordinates with the terminal apparatus to perform a mutual authentication.
Personal information that requires high security is stored in the nonvolatile memory
13 and the encryption circuit 11 performs a mutual authentication
whenever the nonvolatile memory 13 is accessed. This provides a high-level
security of the personal information.
