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. 03, 2013
Filed:
Mar. 31, 2006
Shinji Itoh, Yokohama, JP;
Yoshinori Honda, Kawasaki, JP;
Hiroyasu Nunokami, Tokyo, JP;
Keiji Sakamoto, Chiba, JP;
Shinji Itoh, Yokohama, JP;
Yoshinori Honda, Kawasaki, JP;
Hiroyasu Nunokami, Tokyo, JP;
Keiji Sakamoto, Chiba, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A signature log storing apparatus includes a signature log list and a certificate list, and registers, in the signature log list, a part of signature information in generated hysteresis signature as a signature record and a part of a user certificate in the certificate list. The signature log storing apparatus further includes a trust point list and validates a signature records registered in the signature log list and registers identification information for identifying a latest signature record out of the validate signature record, evidence information for validating validity of the user certificate for a validated signature record, and a hash value of information derived by connecting the evidence information and the hash value as needed or before the user certificate expires.