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:
Apr. 01, 2008
Filed:
Mar. 04, 2005
Mikio Hashimoto, Chiba, JP;
Keiichi Teramoto, Tokyo, JP;
Takeshi Saito, Tokyo, JP;
Kenji Shirakawa, Kanagawa, JP;
Kensaku Fujimoto, Kanagawa, JP;
Mikio Hashimoto, Chiba, JP;
Keiichi Teramoto, Tokyo, JP;
Takeshi Saito, Tokyo, JP;
Kenji Shirakawa, Kanagawa, JP;
Kensaku Fujimoto, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki-shi, JP;
Abstract
Under a multi-task environment, a tamper resistant microprocessor saves a context information for one program whose execution is to be interrupted, where the context information contains information indicating an execution state of that one program and the execution code encryption key of that one program. An execution of that one program can be restarted by recovering the execution state of that one program from the saved context information. The context information can be encrypted by using the public key of the microprocessor, and then decrypted by using the secret key of the microprocessor.