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. 14, 2014
Filed:
Sep. 08, 2011
Masanobu Koike, Tama, JP;
Masanobu Koike, Tama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In an embodiment, regarding an addition of a kb-bit number A and a b-bit random number r, element data of a pre-calculated table C' is set based on a sum A+rof a value Aof upper b/2 bits of a number A, which is lower b bits of the number A, and a value rof upper b/2 bits of the random number r and the sum A+rof a value Aof lower b/2 bits of the number Aand a value rof lower b/2 bits of the random number r in such a way that presence/absence of carrying-over of A+r is indicated. Accordingly, the size of the pre-calculated table needed to be reduced for obtaining an addition result of upper (k−1)b bits by mutually adding the kb-bit number A and the b-bit number r.