Information processing system and information processing method

1. An information processing system, comprising:

an image capturing device; and

a display device that displays an image captured by the image capturing device; wherein the image capturing device includes:

a biometric information acquisition part that acquires biometric information,

an authenticating part that verifies whether the biometric information acquired by the biometric information acquisition part matches registered biometric information registered in advance,

an image capturing part that permits capturing of an image on a condition that authentication by the authenticating part is successful,

an encryptor that encrypts image data captured by the image capturing part to generate encrypted data, and

a data output part that outputs the encrypted data to the display device via a connecting terminal connected to the display device, and

the display device includes:

an acquisition part that acquires the encrypted data via a terminal connected to the image capturing device,

a decryptor that decrypts the encrypted data acquired by the acquisition part,

a display that displays the image data decrypted and acquired by the decryptor,

a hash value generator that generates a hash value of the acquired encrypted data if the encrypted data acquired by the acquisition part differs from any piece of the encrypted data received in the past, and

a hash value managing part that registers the hash value in a database on a network via a communication network.

2. The information processing system according to claim 1 , wherein

the data output part of the image capturing device outputs the encrypted data to the display device on a condition that the authentication in the authenticating part of the image capturing device is successful.

3. The information processing system according to claim 1 , wherein

the image capturing device further includes at least one of a nib and a seal.

4. The information processing system according to claim 1 , wherein

the image capturing device further includes an image capturing device storage that stores a first cryptographic key used by the encryptor to encrypt the image data, and

the display device further includes a display device storage that stores a second cryptographic key for the decryptor to decrypt the data encrypted by the first cryptographic key.

5. The information processing system according to claim 1 , wherein

the display device further includes a display device image capturing part that captures an image for displaying on the display, and

the display displays the image data decrypted by the decryptor and image data newly captured by the display device image capturing part in a comparable manner.

6. The information processing system according to claim 1 , wherein

the image capturing device further includes a time acquisition part that acquires a time when the image capturing part captures an image, and

the encryptor associates the encrypted image data with information indicating a capturing time of the image data to generate the encrypted data.

7. The information processing system according to claim 1 , wherein

the hash value managing part cuts off communication with the communication network in response to completion of registration of the hash value in the database.

8. An information processing method performed in an information processing system including an image capturing device and a display device, the method comprising:

acquiring, by the image capturing device, biometric information;

verifying, by the image capturing device, whether the acquired biometric information matches registered biometric information registered in advance;

permitting, by the image capturing device, capture an image on a condition that the authentication is successful;

encrypting, by the image capturing device, captured image data to generate encrypted data;

outputting, by the image capturing device, the encrypted data to the display device via a connecting terminal connected to the display device;

acquiring, by the display device, the encrypted data through a terminal connected to the image capturing device;

decrypting, by the display device, the acquired encrypted data;

displaying, by the display device, the decrypted and acquired image data on a display included in the display device;

generating, by the display device, a hash value of the acquired encrypted data if the acquired encrypted data differs from any piece of the encrypted data received in the past; and

registering, by the display device, the hash value in a database on a network via a communication network.