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:
Jun. 04, 2013
Filed:
Feb. 25, 2010
Young-sik Kim, Hwaseong-si, KR;
Mi-jung Noh, Yongin-si, KR;
Kyoung-moon Ahn, Seoul, KR;
Sun-soo Shin, Seoul, KR;
Young-sik Kim, Hwaseong-si, KR;
Mi-jung Noh, Yongin-si, KR;
Kyoung-moon Ahn, Seoul, KR;
Sun-soo Shin, Seoul, KR;
Abstract
Provided are a modular multiplier apparatus in which a value of a long path carry (LPC) is predicted to reduce a critical path of an arithmetic operation of Montgomery modular multiplication, and a method of reducing the critical path of the arithmetic operation. The modular multiplier apparatus for obtaining a quotient and a result of an arithmetic operation of modular multiplication by using a modulus and two arbitrary constants includes: a reduction unit for obtaining a short path carry (SPC) included when a result of a modular arithmetic operation is obtained at a current stage, by using a medium calculation result; a carry predictor for predicting a long path carry (LPC) included when the result of the modular arithmetic operation is obtained at the current stage, by using the medium calculation result; and an accumulator for accumulating the result of the modular arithmetic operation by using the SPC and the LPC, wherein the medium calculation result is obtained by adding a result of a modular arithmetic operation obtained at a previous stage and a partial product of the two constants obtained at the current stage.