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. 21, 2009
Filed:
Jan. 27, 2004
Hidenori Nanki, Osaka, JP;
Shiro Yoshioka, Hyogo, JP;
Kenichi Kawaguchi, Hyogo, JP;
Toshiya Kai, Osaka, JP;
Shinichiro Fukai, Osaka, JP;
Hidenori Nanki, Osaka, JP;
Shiro Yoshioka, Hyogo, JP;
Kenichi Kawaguchi, Hyogo, JP;
Toshiya Kai, Osaka, JP;
Shinichiro Fukai, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An information processing apparatus comprising a secure information unit that is set to the state not requiring security in the case where the data is transferred from a user memory space to a general purpose register, and that is set to the state requiring security in the case where the data is transferred from a secure memory space to the general purpose register. An encryption key in the secure memory space is prevented from being stolen by prohibiting the data transfer to the user memory space from the general purpose register with the value of the secure information unit set to the state requiring security.