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. 02, 2016
Filed:
Mar. 01, 2013
Katsuyuki Takashima, Chiyoda-ku, JP;
Tatsuaki Okamoto, Musashino, JP;
Katsuyuki Takashima, Chiyoda-ku, JP;
Tatsuaki Okamoto, Musashino, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
The present invention aims to allow for addition of an attribute category without reissuing a public parameter. A cryptographic systemuses an indexing technique in dual system encryption in dual pairing vector spaces. Specifically, for a transmission-side vector tfor index j, the cryptographic systemsets information J assigned to the index j in advance as a coefficient of a predetermined basis vector. For a reception-side vector for index j' corresponding to the index j, the cryptographic systemsets information J′ having an inner-product of 0 with the information J as a coefficient of a basis vector corresponding to the predetermined basis vector.