| 摘要 |
After a selection key bundle is determined by a selection key bundle determining process, the following first authentication key authenticating process is executed. An authentication processing part selects a selection encryption key from selection key bundle following a predetermined association based on a received random-number data. On the other hand, another authentication processing part selects an encryption key from the selection key bundle as a selection encryption key, following the association based on the received random-number data, encrypts the random-number data using the selection encryption key so as to acquire encrypted random-number data and transmits to the former authentication processing part. The former authentication processing part decrypts the encrypted random-number data using the selection encryption key so as to acquire decrypted random-number data and then determines whether that authentication is acceptable based on a comparison between the transmission time original random-number data and decrypted random-number data.
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