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:
Jun. 23, 2009
Filed:
Jul. 15, 2004
Zhengrong Liu, Foster City, CA (US);
Harold Aaron Ludtke, San Jose, CA (US);
Ikuo Shinozaki, Saitama, JP;
Zhengrong Liu, Foster City, CA (US);
Harold Aaron Ludtke, San Jose, CA (US);
Ikuo Shinozaki, Saitama, JP;
Sony Corporation, Tokyo, JP;
Sony Electronics, Inc., Parkrigde, NJ (US);
Abstract
A system to manage and control usage rights for cryptographic keys. A kernel process is provided with secure and exclusive authorization to access certain keys in a key hierarchy. Special authorization is required for other processes or users to access keys used by the kernel. A persistent storage area is used to hold a Kernel Authorization Data field for the root key and/or other keys used by the kernel or other specialized processes. The authorization data, and the keys it protects, can be used to protect other portions of, or the entire, key structure. The persistent storage area is reserved in a TPM or similar security hardware.