Key management system and method for the same

• US 20060188099A1
• Filed: 02/06/2006
• Published: 08/24/2006
• Est. Priority Date: 02/21/2005
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kondo, Atsushi, Kimura, Ichiro
• Application Number:
  US11/347,226
• Publication Number:
  US 20060188099A1
• Time in Patent Office: Days
• US Class Current: 380/277
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G11B 20/00246 wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder

Abstract

An inexpensive and secure key management system provides a digital content copy protection system and a method for the same. The key management system is constituted by a master data memory configured to be stored with a device key, a secret data management block configured to convert the device key to a plain text key, a write-in and encryption process block including an encrypting function block for encrypting the plain text key, a nonvolatile memory configured in a first chip and stored with an encryption key encrypted by the write-in and encryption process block, and a signal processing LSI configured in a second chip and including a decrypting function block for decrypting the encryption key.

Claims

1. A key management system, comprising:

a master data memory configured to be stored with a device key;

a secret data management block configured to convert the device key to a plain text key;

a write-in and encryption process block configured to include an encryption function block and to encrypt the plain text key;

a nonvolatile memory configured in a first chip and stored with an encryption key encrypted by the write-in and encryption process block; and

a signal processing LSI configured in a second chip and including a decrypting function block for decrypting the encryption key.

2. The key management system of claim 1 further comprising:

a board on which the nonvolatile memory and the signal processing LSI are mounted.

3. The key management system of claim 1, wherein

the nonvolatile memory is an EEPROM.

4. The key management system of claim 1, wherein

the decrypting function block decrypts the encryption key by decrypting the encryption key.

5. The key management system of claim 1, wherein

the device key is pre-encrypted and the signal processing LSI decrypts the encrypted device key.

6. The key management system of claim 1, wherein

the device key is pre-PGP encrypted and the signal processing LSI decrypts the PGP-encrypted device key.

7. The key management system of claim 1, further comprising:

a multi-encryption/decryption process of repeating an encryption process and a decryption process for the device key by the signal processing LSI.

8. A key management system, comprising:

a master data memory configured to be stored with a device key;

a secret data management block configured to convert the device key to a plain text key;

a write-in and encryption process block configured to include an encryption function block and to encrypt the plain text key;

a recording medium configured to be stored with an encryption key encrypted by the write-in and encryption process block; and

a signal processing LSI including a decrypting function block for decrypting the encryption key.

9. The key management system of claim 8 further comprising:

a write-in process block configured to read out the encryption key stored in the recording medium and conduct a write-in process; and

a nonvolatile memory configured to be stored with the encryption key, which has been written in by the write-in process block.

10. The key management system of claim 9 further comprising:

a board on which the nonvolatile memory and the signal processing LSI are mounted.

11. The key management system of claim 9, wherein

the nonvolatile memory is an EEPROM.

12. The key management system of claim 9, wherein

the decrypting function block decrypts the encryption key by carrying out a decryption process for the encryption key.

13. The key management system of claim 9, wherein

the device key is pre-encrypted and the signal processing LSI decrypts the encrypted device key.

14. The key management system of claim 9, wherein

the device key is pre-PGP encrypted and the signal processing LSI decrypts the PGP-encrypted device key.

15. The key management system of claim 9, further comprising:

a multi-encryption/decryption process of repeating an encryption process and a decryption process for the device key by the signal processing LSI.

16. A key management method, comprising:

receiving a device key stored in a master data memory;

converting the device key to a plain text key by a secret data management block;

encrypting the plain text key by a write-in and encryption process block including an encryption function block;

recording an encryption key encrypted by the write-in and encryption process block in a nonvolatile memory configured in a first chip; and

fabricating a signal processing LSI configured in a second chip and including a decrypting function block for decrypting the encryption key.

17. The key management method of claim 16 further comprising:

mounting the nonvolatile memory and the signal processing LSI on a single board.

18. A key management method, comprising:

receiving a device key stored in a master data memory;

converting the device key to a plain text key by a secret data management block;

encrypting the plain text key by a write-in and encryption process block including an encryption function block;

storing, in a recording medium, an encryption key encrypted by the write-in and encryption process block; and

fabricating a signal processing LSI including a decrypting function block for decrypting the encryption key.

19. The key management method of claim 18 further comprising:

reading out the encryption key from the recording medium and conducting a write in process by the write-in process block; and

writing the encryption key in the nonvolatile memory, which has been written in by the write-in process block.

20. The key management method of claim 18, wherein

the decrypting function block decrypts the encryption key by carrying out a decryption process for the encryption key.