To prevent illegal use by a third person other than a regular user.
A human body information recognition integrated circuit 1a has a recognition circuit 11a authenticating a user by using human body information when the user requests service supply and a ciphering circuit 12a ciphering data obtained by adding an authentication result to a random number transmitted from the service supply device 2a. The service supply device 2a has a random number generation circuit 22a generating the random number when service supply is requested, a decoding circuit 21a decoding received ciphering data and a result deciding circuit 23a permitting service supply to the user only when the authentication result in decoding data shows OK of authentication, and the random number in decoding data is matched with the random number generated in the random number generation circuit 22a.
SHIGEMATSU TOMOSHI
HATANO TAKAHIRO
