INFORMATION PROCESSING APPARATUS AND METHOD

• US 20100313026A1
• Filed: 07/23/2010
• Published: 12/09/2010
• Est. Priority Date: 07/06/2000
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakano, Takehiko
• Granted Patent: US 8,595,500 B2
• Time in Patent Office: Days
• US Class Current: 713/171
• CPC Class Codes: H04H 20/76 Wired systems
• CPC Class Codes: H04H 60/23 using cryptography, e.g. encryption, authentication, key distribution
• CPC Class Codes: H04H 60/80 characterised by transmission among terminal devices
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 9/0822 using key encryption key
• CPC Class Codes: H04L 9/0825 using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates
• CPC Class Codes: H04L 9/32 including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
• CPC Class Codes: H04L 9/3252 using DSA or related signature schemes, e.g. elliptic based signatures, ElGamal or Schnorr schemes
• CPC Class Codes: H04L 9/3263 involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements network architectures or network communication protocols for supporting authentication of entities using certificates in a packet data network H04L63/0823
• CPC Class Codes: H04L 9/3271 using challenge-response

Abstract

In order to limit use of content, when a source receives a request for transmitting content from a sink, the source performs an authentication process. When the authentication is successful, the source transmits to the sink key information necessary for decrypting the encryption applied to the content. The sink can receive the content by receiving the key information and by decrypting the encryption applied to the content by using the key information.

Claims

1. An information processing apparatus, comprising:

a random value transmitting unit that transmits a random value to another information processing apparatus that receives encrypted content;

a signature judging unit that judges whether a signature is valid, the signature being generated by the another information processing apparatus based on the random value and then transmitted from the another information processing apparatus;

a key transmitting unit that transmits key information used for decrypting the encrypted content to the another processing apparatus in response to the signature being valid;

a determining unit that determines an additional value used to update a count of information processing apparatuses that receive the key information based on whether identification information of the another information processing apparatus is registered in a registration list that includes respective identification information of each one of the information processing apparatuses that receive the key information; and

an updating unit that updates the count by adding to it the additional value.

2. An information processing apparatus according to claim 1, wherein the random value is generated using a pseudo-random number generation process.

3. An information processing apparatus according to claim 1, further comprising:

a receiving unit that receives from the another information processing apparatus a digital certificate associated with the another information processing apparatus, and

a control unit that determines whether the digital certificate received from the another information processing apparatus is valid,

wherein the random value transmitting unit transmits the random value to the another information processing apparatus in response to the digital certificate being determined to be valid.

4. An information processing apparatus according to claim 3, wherein the digital certificate includes the identification information of the another information processing apparatus and further key information associated with the another information processing apparatus.

5. An information processing apparatus according to claim 1, wherein the signature is generated by the another information processing apparatus using further key information associated with the another information processing apparatus.

6. An information processing apparatus according to claim 5, wherein the further key information associated with the another information processing apparatus is a private key.

7. An information processing apparatus according to claim 1, wherein the signature judging unit judges whether the signature is valid using further key information associated with the another information processing apparatus.

8. An information processing apparatus according to claim 7, wherein the further key information associated with the another information processing apparatus is a public key.

9. An information processing apparatus according to claim 1, wherein the random value transmitting unit transmits the random value to the another information processing apparatus in response to the count being less than a predefined maximum value.

10. An information processing apparatus according to claim 1, wherein in response to the determining unit determining that the identification information of the another information processing apparatus is not registered in the registration list, the determining unit determines the additional value and the updating unit updates the count by adding to it the additional value, and in response to the determining unit determining that the identification information of the another information processing apparatus is registered in the registration list, the determining unit does not determine the additional value and the updating unit does not update the count.

11. An information processing method carried out by an information processing apparatus, the method comprising:

transmitting a random value to another information processing apparatus that receives encrypted content;

judging whether a signature is valid, the signature being generated by the another information processing apparatus based on the random value and then transmitted from the another information processing apparatus;

transmitting key information used for decrypting the encrypted content to the second processing apparatus in response to the signature being valid;

determining an additional value used to update a count of information processing apparatuses that receive the key information based on whether the identification information of the another information processing apparatus is registered in a registration list that includes respective identification information of each one of the information processing apparatuses that receive the key information; and

updating the count by adding to it the additional value.

12. A computer-readable medium having recorded thereon computer program instructions for an information processing apparatus to execute an information processing method, the method comprising:

transmitting a random value to another information processing apparatus that receives encrypted content;

judging whether a signature is valid, the signature being generated by the another information processing apparatus based on the random value and then transmitted from the another information processing apparatus;

transmitting key information used for decrypting the encrypted content to the second processing apparatus in response to the signature being valid;

determining an additional value used to update a count of information processing apparatuses that receive the key information based on whether the identification information of the another information processing apparatus is registered in a registration list that includes respective identification information of each one of the information processing apparatuses that receive the key information; and

updating the count by adding to it the additional value.