The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 2006
Filed:
Jan. 31, 2002
Mikio Hashimoto, Kanagawa, JP;
Kenji Shirakawa, Kanagawa, JP;
Keiichi Teramoto, Tokyo, JP;
Kensaku Fujimoto, Kanagawa, JP;
Satoshi Ozaki, Kanagawa, JP;
Mikio Hashimoto, Kanagawa, JP;
Kenji Shirakawa, Kanagawa, JP;
Keiichi Teramoto, Tokyo, JP;
Kensaku Fujimoto, Kanagawa, JP;
Satoshi Ozaki, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In a microprocessor that internally has a microprocessor specific secret key, a key management unit is provided to carry out a key registration for reading out from an external memory a distribution key that is obtained in advance by encrypting the instruction key by using a public key corresponding to the secret key, decrypting the distribution key by using the secret key to obtain the instruction key, and registering the instruction key in correspondence to a specific program identifier for identifying the program into a key table, and to notify a completion of the key registration to the processor core asynchronously by interruption when the key registration is completed.