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. 13, 2012
Filed:
Sep. 16, 2009
Applicants:
Koichiro Akiyama, Tokyo, JP;
Yasuhiro Goto, Hakodate, JP;
Inventors:
Koichiro Akiyama, Tokyo, JP;
Yasuhiro Goto, Hakodate, JP;
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04L 29/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A decryption apparatus includes a section assignment unit which assigns a section D to a plurality of encrypted texts F(x,y,t) (i=1, . . . , k), a one-variable polynomial arithmetic unit which subtracts L pairs of polynomials h(t) and h(t) after the assignment, and a greatest common divisor arithmetic unit which obtains the greatest common divisor φ(t) of L polynomials g(t)(=h(t)−h(t)) (j=1, . . . , L) as a result of the subtraction.