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. 05, 2008
Filed:
Jun. 14, 2006
Takahiro Fujishiro, Yokohama, JP;
Satoru Tezuka, Yokohama, JP;
Yoko Kumagai, Kawasaki, JP;
Tomoharu Morio, Sakura, JP;
Yutaka Miyazaki, Sakura, JP;
Takahiro Fujishiro, Yokohama, JP;
Satoru Tezuka, Yokohama, JP;
Yoko Kumagai, Kawasaki, JP;
Tomoharu Morio, Sakura, JP;
Yutaka Miyazaki, Sakura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A time period which is expended since a request for the authentication of the validity of a public key certificate till the authentication of the validity, is shortened. A certificate validity authentication center VC periodically searches for and verifies paths which extend from a bridge certification authority CAto individual terminal admitting certification authorities CA, and it registers the paths whose verifications have held good, in a path database in association with the respective terminal admitting certification authorities CA. Besides, in a case where the request for the authentication of the validity of a certificate has been made by an end entity EE, whether or not a path associated with the terminal admitting certification authority CA which admits the end entity, and a path associated with the terminal admitting certification authority CA which has issued the certificate being a subject for the request are registered in the path database is checked, and the subject certificate is judged valid only when both the paths are registered.