Key management system and method for the same
AssigneeKabushiki Kaisha Toshiba
InventorsAtsushi Kondo, Ichiro Kimura
Life of this patent
Estimating the term…
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.
Claims20
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.
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.
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.
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.
Dependencies are inferred from the claim text.