CONTENT TRANSMISSION APPARATUS, CONTENT RECEPTION APPARATUS AND CONTENT TRANSMISSION METHOD

• US 20110314282A1
• Filed: 08/29/2011
• Published: 12/22/2011
• Est. Priority Date: 01/16/2004
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi Consumer Electronics Company Limited (Hitachi, Ltd.)
• Inventors: OKAMOTO, Hiroo, TANAKA, Mayuko, KUDO, Yoshimichi
• Granted Patent: US 8,468,350 B2
• Time in Patent Office: Days
• US Class Current: 713/168
• CPC Class Codes: H04L 2209/603 Digital right managament [DRM]
• CPC Class Codes: H04L 9/0841 involving Diffie-Hellman or related key agreement protocols
• CPC Class Codes: H04L 9/3273 for mutual authentication network architectures or network communication protocols for achieving mutual authentication in a packet data network H04L63/0869

Abstract

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.

Claims

1. A content transmission apparatus comprising:

an authenticator configured (i) to perform an authentication for a content reception apparatus,(ii) to share an authentication key with said content reception apparatus, (iii) to send a request for transmission range acknowledgement and authentication information to said content reception apparatus, (iv) to receive a response transmitted from said content reception apparatus responding to said request for transmission range acknowledgement, and (v) to share an exchange key with said content reception apparatus;

an encryptor configured to encrypt a content to be transmitted to said content reception apparatus based on said exchange key; and

a timer used for measuring a time interval between transmission of said request for transmission range acknowledgement to said content reception apparatus and reception of said response transmitted from said content reception apparatus responding to the transmission of said request for transmission range acknowledgement;

wherein, said authenticator measures said time interval between said transmission of said request and said reception of said response using said timer, and if a measurement value of said time interval exceeds a predetermined value, said authenticator does not share said exchange key with said content reception apparatus; and

wherein, said response of said request for transmission range acknowledgement from said content reception apparatus 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 with said content reception apparatus.

2. A content reception apparatus comprising:

an authenticator configured (i) to perform an authentication for said content transmission apparatus, (ii) to share an authentication key with said content transmission apparatus, (iii) to receive a request for transmission range acknowledgement and authentication information from said content transmission apparatus, (iv) to generate data based on said authentication information and said authentication key transmitted from said content transmission apparatus, (v) to send a response to said request for transmission range acknowledgement including said data to said content transmission apparatus, and (vi) to share an exchange key with said content transmission apparatus; and

a decryptor configured to generate a key based on said exchange key produced by said authenticator as a result of execution of an authentication process in said authenticator, and to decrypt a content transmitted by said content transmission apparatus by using said key;

wherein, said authenticator

     1) receives said request for said transmission range acknowledgement and said authentication information transmitted from said content transmission apparatus and

     2) sends said response for said transmission range acknowledgement including said data generated based on said authentication information and said authentication key to said content transmission apparatus within a predetermined time that is after receiving said request for said transmission range acknowledgement, and

if said authenticator cannot send said response to said content transmission apparatus within said predetermined time, said authenticator does not share said exchange key with said content transmission apparatus; and

wherein, if said data which is generated based on said authentication information and said authentication key and which is included in said response to said request for transmission range acknowledgement from said content transmission apparatus is incorrect, said authenticator does not hare said exchange key with said content transmission apparatus.

3. A content transmission apparatus comprising:

an authenticator configured (i) to perform an authentication for a content reception apparatus, (ii) to share an authentication key with said content reception apparatus, (iii) to send a request for transmission range acknowledgement and authentication information to said content reception apparatus, (iv) to receive a response transmitted from said content reception apparatus responding to said request for transmission range acknowledgement, and (v) to share said exchange key with said content reception apparatus; and

a timer used for measuring a time interval between transmission of said request for transmission range acknowledgement to said content reception apparatus and reception of said response transmitted from said content reception apparatus responding to the transmission of said request for transmission range acknowledgement;

wherein, said authenticator measures said time interval between said transmission of request and said reception of said response using said timer, and if a measurement value of said time interval exceeds a predetermined value, said authenticator does not share said exchange key with said content reception apparatus so that a range of the distribution of said content is limited within a house; and

wherein, said response of said request for transmission range acknowledgement from said content reception apparatus 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 with said content reception apparatus.

4. A content reception apparatus comprising:

an authenticator configured (i) to perform an authentication for said content transmission apparatus, (ii) to share an authentication key with said content transmission apparatus,(iii) to receive a request for transmission range acknowledgement and authentication information from said content transmission apparatus,(iv) to generate data based on said authentication information and said authentication key transmitted from said content transmission apparatus,(v) to send a response of said request for transmission range acknowledgement including said data to said content transmission apparatus, and (vi) to share an exchange key with said content transmission apparatus;

wherein, said authenticator receives said request for said transmission range acknowledgement, and if said authentication cannot send a response to said request for said transmission range acknowledgement to said content transmission apparatus within a predetermined time after receiving said request, said authenticator does not share said exchange key with said content transmission apparatus; and

wherein, said response includes data generated based on said authentication information and said authentication key, and if said data is incorrect, said authenticator does not hare said exchange key with said content transmission apparatus.