Patent ID: 8037315

Claim:
An IC card, comprising: a fingerprint sensor; a display device for displaying an encrypted image that is readable by an external device; a control unit controlling the fingerprint sensor and the display device, the control unit performing a first authentication based on a fingerprint of a user scanned by the fingerprint sensor, displaying the encrypted image on the display device, after the first authentication, the encrypted image being used for a second authentication performed by the external device, the second authentication including the external device reading the encrypted image after the first authentication is made, the external device decrypting the encrypted image read by the external device, and the external device authenticating the user based on the decrypting of the encrypted image, the control unit erasing the encrypted image displayed by the display device after a transaction is carried out between the IC card and the external device based on the second authentication, and the control unit displaying a default image on the display device after the transaction is carried out; and a memory that stores the encrypted image and the default image.