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:
Nov. 11, 2014
Filed:
Nov. 25, 2009
Hiroshi Suu, Chigasaki, JP;
Akira Miura, Sagamihara, JP;
Akihiro Kasahara, Chiba, JP;
Shinichi Matsukawa, Tokyo, JP;
Hiroshi Suu, Chigasaki, JP;
Akira Miura, Sagamihara, JP;
Akihiro Kasahara, Chiba, JP;
Shinichi Matsukawa, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
To reduce a load on a user terminal imposed when verifying signature data and at the same time reduce a load on a server, a signature key matrix KM includes a plurality of signature keys Ki-j arranged in a matrix structure of m rows and n columns, and is stored in a signature key matrix database. A correspondence relationship between a signature key set CK which is an aggregate of any signature keys selected from the n columns respectively and a user terminalis stored in a correspondence relationship information database. A signature data generating unitgenerates signature data having a matrix structure by encrypting a content digest D generated based on content data C by n number of signature keys included in the signature key matrix KM.