Patent ID: 8611538

Claim:
An information processing apparatus comprising: a storage section configured to store a key used for encrypting or decrypting data; a reception section configured to receive a key transmission request including a key-dividing number via a wireless signal from an operation terminal; a key transmission request acquisition section configured to acquire the key transmission request from the wireless signal received by the reception section; a security level determination section configured to determine a security level at a time of transmitting the key to the operation terminal, as a transmission security level; a transmission power determination section configured to determine a transmission power in accordance with the transmission security level determined by the security level determination section and the key-dividing number included in the key transmission request acquired by the key transmission request acquisition section; a key acquisition section configured to acquire each key fragment by dividing the key stored in the storage section into the key-dividing number; and a transmission section configured to transmit the each key fragment acquired by the key acquisition section using the transmission power determined by the transmission power determination section, via a wireless signal to the operation terminal; wherein: the transmission power determination section is configured to register, in the storage section, the key-dividing number included in the key transmission request acquired by the key transmission request acquisition section and the determined transmission power, as a previous key-dividing number and a previous transmission power, respectively; in a case where the processing execution section is unsuccessful in decrypting the encrypted processing request, the transmission power determination section is configured to acquire once again the key-dividing number included in the key transmission request acquired by the key transmission request acquisition section; the transmission power determination section is configured to calculate a difference value between the acquired key-dividing number and the previous key-dividing number registered in the storage section; and in a case where the calculated difference value is equal to or less than a predetermined value, the transmission power determination section is configured to determine the transmission power as a value larger than the previous transmission power registered in the storage section.