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:
Dec. 20, 2011
Filed:
Dec. 27, 2005
Osamu Takata, Tokyo, JP;
Takahiro Fujishiro, Yokohama, JP;
Tadashi Kaji, Yokohama, JP;
Kazuyoshi Hoshino, Komae, JP;
Osamu Takata, Tokyo, JP;
Takahiro Fujishiro, Yokohama, JP;
Tadashi Kaji, Yokohama, JP;
Kazuyoshi Hoshino, Komae, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
When a cryptographic communicating partof the communication support serverexchanges information with the information processing unitsif the term of validity of a first key stored in a cryptographic key storing partand corresponding to the identification information of the information processing unitdoes not expire, the cryptographic communicating partperforms the cryptographic communication with the information processing unitusing the first key, without performing a process of authenticating the information processing units. When the term of validity of the first key expires or the first key corresponding to the identification information of the information processing unitsis not stored, the key sharing partshares the first key with the information processing unitsand the cryptographic communicating partperforms the cryptographic communication with the information processing unitsusing a newly shared first key.