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:
Jul. 22, 2003
Applicants:
Naoya Takao, Kobe, JP;
Keiji Sugiyama, Jyoyo, JP;
Toshiya Mori, Settu, JP;
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 1/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
A manager or an issuer issues a participation certificate, for an ordinary user who will newly join a group formed on a network made up of specified users, on which the manager or issuer creates a digital signature by the use of a private key of the group. Members belonging to the group authenticate one another as belonging to the same group and as authorized members of the group, on the basis of their respective participation certificates.