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. 29, 2007
Filed:
Apr. 05, 2001
Tomoyuki Asano, Kanagawa, JP;
Yoshitomo Osawa, Kanagawa, JP;
Ryuji Ishiguro, Tokyo, JP;
Atsushi Mitsuzawa, Tokyo, JP;
Tateo Oishi, Saitama, JP;
Tomoyuki Asano, Kanagawa, JP;
Yoshitomo Osawa, Kanagawa, JP;
Ryuji Ishiguro, Tokyo, JP;
Atsushi Mitsuzawa, Tokyo, JP;
Tateo Oishi, Saitama, JP;
Sony Corporation, , JP;
Abstract
In a tree-structural key distribution system, renewed data of a master key and medium key are sent along with a key renewal block (KRB). KRB is such that each of devices included as leaves of a tree structure has a leaf key and restricted node key. A specific KRB can be generated for a group identified by a specific node and distributed to the group to restrict a device for which the key can be renewed. Any device not belonging to the group cannot decrypt the key, whereby the security of key distribution can be assured. Especially in a system using a generation-managed master key, a master key renewed with KRB can be distributed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile