IC card and method for controlling IC card

An integrated circuit card comprising:

• an acquirer configured to acquire biometric information of at least one user to be authenticated;
• an integrated circuit module including a communicator configured to communicate with a terminal device, a storage storing a plurality of pieces of biometric authentication information for the at least one user, and a processor configured to collate the biometric information acquired by the acquirer with each of the plurality of pieces of biometric authentication information stored in the storage in a case that the communicator receives a command from the terminal device, identify one of the plurality of pieces of biometric authentication information whose matching score with acquired biometric information is greater than or equal to a second threshold value which is less than a first threshold value as a collation matching score, and update the identified one of the plurality of pieces of biometric authentication information stored in the storage with a corresponding acquired biometric information in accordance with the condition that it is found to be successful in the collation when the communicator receives a second command and collates the biometric authentication information stored in the storage with the biometric information acquired by the acquirer;
• and
• a card base material in which the acquirer and the integrated circuit module are embedded.

An integrated circuit card comprising:

• an acquirer configured to acquire biometric information of a user;
• an integrated circuit module including a communicator configured to communicate with a terminal device, a storage storing a plurality of pieces of biometric authentication information, and a processor configured to collate the biometric information acquired by the acquirer with each of the plurality of pieces of biometric authentication information stored in the storage in a case that the communicator receives a command from the terminal device and update some of the plurality of pieces of biometric authentication information stored in the storage to information on the basis of the biometric information acquired by the acquirer in accordance with collation results for the biometric authentication information;
• and
• a card base material in which the acquirer and the integrated circuit module are embedded,
• wherein
• hardware configured to perform a collation process among processes to be performed by the processor is provided outside the integrated circuit module,
• the acquirer, the integrated circuit module, and the hardware are embedded in the card base material,
• the integrated circuit module is configured to encrypt first information with a public key and transmit the encrypted first information to the hardware,
• the hardware is configured to encrypt second information with the public key and transmit the encrypted second information to the integrated circuit module,
• the integrated circuit module is configured to decode the second encrypted information using the public key, and
• the hardware is configured to decode the first encrypted information using the public key.