| 摘要 |
A content transmission apparatus including: an authenticator configured (i) to perform authentication, (ii) to share an authentication key, (iii) to request transmission range acknowledgement and authentication information, (iv) to receive a response, and (v) to share an exchange key; an encryptor to encrypt based on the exchange key; and a timer measuring a time interval between transmission of said request for transmission range acknowledgement and reception of a response; wherein, said authenticator measures said time interval using said timer, and if a time measurement value exceeds a predetermined value, said authenticator does not share said exchange key; and wherein, said response of said request for transmission range acknowledgement includes a data generated based on said authentication information and said authentication key, and if said data is incorrect, said authenticator does not share said exchange key.
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