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:
Jan. 20, 2015
Filed:
Dec. 06, 2011
Applicants:
Katsuyuki Takashima, Tokyo, JP;
Tatsuaki Okamoto, Tokyo, JP;
Inventors:
Katsuyuki Takashima, Tokyo, JP;
Tatsuaki Okamoto, Tokyo, JP;
Assignees:
Mitsubishi Electric Corporation, Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 21/00 (2013.01); H04L 9/08 (2006.01); H04L 9/30 (2006.01); H04L 9/00 (2006.01);
U.S. Cl.
CPC ...
H04L 9/08 (2013.01); H04L 9/3073 (2013.01); H04L 9/007 (2013.01); H04L 9/008 (2013.01);
Abstract
The object is to provide a secure functional encryption scheme having many cryptographic functions. An access structure is constituted by applying the inner-product of attribute vectors to a span program. The access structure has a degree of freedom in design of the span program and design of the attribute vectors, thus having a large degree of freedom in design of access control. A functional encryption process is implemented by imparting the access structure to each of a ciphertext and a decryption key.