Information processing apparatus and method

• US 9,112,678 B2
• Filed: 02/19/2013
• Issued: 08/18/2015
• Est. Priority Date: 07/06/2000
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakano, Takehiko
• Primary Examiner(s): Nalven, Andrew
• Assistant Examiner(s): DO, KHANG D
• Application Number:
  US13/770,002
• Publication Number:
  US 20130166912A1
• Time in Patent Office: 910 Days
• Field of Search: 713/168, 380/29, 726 2- 21
• US Class Current: 1/1
• 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:

circuitry configured to

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

judge whether information is valid, the information being generated at the another information processing apparatus based on the random value and then transmitted from the another information processing apparatus;

transmit key information used for decrypting the encrypted content to the another information processing apparatus in response to the information being valid;

determine 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;

update the count by adding the additional value to the count; and

increase a predefined maximum value of the count during an authentication process when (i) the count is equal to or larger than the predefined maximum value and (ii) the information processing apparatus is arranged as a bridge processing apparatus.

2. The information processing apparatus according to claim 1, further comprising:

a random number generator;

wherein the circuitry transmit the random value generated at the random number generator to the another information processing apparatus.

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

4. The information processing apparatus according to claim 1, in which the circuitry is further configured to receive from the another information processing apparatus a digital certificate associated with the another information processing apparatus, and determine whether the digital certificate received from the another information processing apparatus is valid,

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

5. The information processing apparatus according to claim 4, 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.

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

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

8. The information processing apparatus according to claim 1, wherein the circuitry judges whether the information is valid using further key information associated with the another information processing apparatus.

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

10. The information processing apparatus according to claim 1, wherein the circuitry transmits the random value to the another information processing apparatus in response to the count being less than the predefined maximum value.

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

12. The information processing apparatus according to claim 1, in which the circuitry includes a control section that controls the random value transmitting, the judging, the key information transmitting, and the determining.

13. The information processing apparatus according to claim 1, in which the circuitry includes a communication interface (I/F) from which the random value and the key information are transmitted to the another information processing apparatus, and the information generated by the another information processing apparatus is received via the communication interface.

14. The information processing apparatus according to claim 1, in which the circuitry plays back content recorded on a medium.

15. The information processing apparatus according to claim 1, in which the circuitry encrypts at least one of played back content or received content.

16. The information processing apparatus according to claim 1, in which the circuitry stores at least one of played back content or received content.

17. An information processing apparatus comprising:

circuitry configured to

receive a random value transmitted by another information processing apparatus;

generate information based on the received random value;

transmit the information to the another information processing apparatus; and

receive key information transmitted by the another processing apparatus in response to the another information processing apparatus judging that the information is valid, the key information being used for decrypting encrypted content;

wherein the circuitry receives the random value from the another information processing apparatus in response to the another information processing apparatus determining that a count of information processing apparatuses that receive the key information is less than a predefined maximum value, and

in which the predefined maximum value of the count is increased during an authentication process when (i) the count is equal to or larger than the predefined maximum value and (ii) the information processing apparatus is arranged as a bridge processing apparatus.

18. The information processing apparatus according to claim 17, in which the circuitry is further configured to transmit a digital certificate associated with the information processing apparatus to the another information processing apparatus, and receive the random value from the another information processing apparatus in response to the another information processing apparatus determining that the digital certificate is valid.

19. The information processing apparatus according to claim 18, wherein the digital certificate includes the identification information of the information processing apparatus and further key information associated with the information processing apparatus.

20. The information processing apparatus according to claim 17, wherein the circuitry generates the information using further key information associated with the information processing apparatus.

21. The information processing apparatus according to claim 20, wherein the further key information associated with the information processing apparatus is a private key.

22. The information processing apparatus according to claim 17, wherein the circuitry receives the key information in response to the another information processing apparatus judging that the information is valid using further key information associated with the information processing apparatus.

23. The information processing apparatus according to claim 22, wherein the further key information associated with the information processing apparatus is a public key.

24. The information processing apparatus according to claim 17, in which the circuitry includes a control section that controls the random value receiving, the information transmitting, and the key information receiving.

25. The information processing apparatus according to claim 17, in which the circuitry includes a communication interface (I/F) whereat the random value is received from the another information processing apparatus, and the key information transmitted by the another information processing apparatus is received via the communication interface.

26. The information processing apparatus according to claim 17, in which the circuitry decrypts the encrypted content using the received key information.

27. The information processing apparatus according to claim 17, in which the circuitry stores at least one of the encrypted content or the decrypted content.