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:
Aug. 09, 2011
Filed:
Jun. 26, 2008
Taichi Sato, Kyoto, JP;
Kaoru Yokota, Hyogo, JP;
Natsume Matsuzaki, Osaka, JP;
Yuichi Futa, Osaka, JP;
Tetsuya Inoue, Kyoto, JP;
Masao Nonaka, Osaka, JP;
Taichi Sato, Kyoto, JP;
Kaoru Yokota, Hyogo, JP;
Natsume Matsuzaki, Osaka, JP;
Yuichi Futa, Osaka, JP;
Tetsuya Inoue, Kyoto, JP;
Masao Nonaka, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Provided is a group subordinate terminal in a key updating system that includes a server and a group of terminals including: a group managing terminal; and group subordinate terminals including the group subordinate terminal, the group subordinate terminal comprising: a group withdrawal request processing unit which transmits a group withdrawal request to the group managing terminal in response to an instruction to update its apparatus-unique key, the group withdrawal request requesting for withdrawal of the group subordinate terminal from the group; an update apparatus-unique key requesting unit which requests for another apparatus-unique key by transmitting to the server a group withdrawal certificate indicating that the withdrawal of the group subordinate terminal from the group of terminals is completed through invalidation of its group key; and an update processing unit which updates the apparatus-unique key held in an apparatus-unique key holding unit to the another apparatus-unique key obtained from the server.