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:
May. 15, 2007
Filed:
Mar. 20, 2003
Mikio Hashimoto, Kanagawa, JP;
Kensaku Yamaguchi, Kanagawa, JP;
Kenji Shirakawa, Kanagawa, JP;
Kensaku Fujimoto, Kanagawa, JP;
Mikio Hashimoto, Kanagawa, JP;
Kensaku Yamaguchi, Kanagawa, JP;
Kenji Shirakawa, Kanagawa, JP;
Kensaku Fujimoto, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In an inner memory type tamper resistant microprocessor, a requested secret protection attribute requested for each access target memory page by a task is set and stored exclusively from other tasks, at a time of reading a program into memory pages and executing the program as the task, and a memory secret protection attribute is set and stored for each access target memory page by the task, at a time of executing the task. Then, an access to each access target memory page is refused when the requested secret protection attribute for each access target memory page and the memory secret protection attribute for each access target memory page do not coincide.