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. 20, 2013
Filed:
Jun. 19, 2009
Yoko Kumagai, Tokyo, JP;
Takahiro Fujishiro, Yokohama, JP;
Tadashi Kaji, Fujisawa, JP;
Shingo Hane, Yokohama, JP;
Hitoshi Shimonosono, Funabashi, JP;
Yoko Kumagai, Tokyo, JP;
Takahiro Fujishiro, Yokohama, JP;
Tadashi Kaji, Fujisawa, JP;
Shingo Hane, Yokohama, JP;
Hitoshi Shimonosono, Funabashi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand. Besides, in a case where a request for authenticating the validity of a certificate has been received from an end entity, the validation authority judges the validity of the public key certificate by checking in which of the valid-path database and the invalid-path database a path corresponding to the request is registered. On the other hand, in a case where the path corresponding to the validity authentication request is not registered in either of the databases, the validity of the public key certificate is authenticated by performing path search and validation anew.