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:
Dec. 01, 2009
Filed:
Oct. 02, 2002
Chin-long Chen, Fishkill, NY (US);
Chin-Long Chen, Fishkill, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Modular reduction and modular multiplication for large numbers are required operations in public key cryptography. Moreover, efficient execution of these two operations is important to achieve high performance levels in cryptographic engines and processes. The present invention uses multiplication and addition instead of using division and subtraction to perform modular arithmetic. The present invention also achieves some of its advantages through processing which begins with the high order bits coupled with judicious observations pertaining to circumstances under which carry output signals from addition operations are generated. These carry output signals are used to provide corrections which thus enable the use of the higher order bits and the efficiencies that such use engenders. Additionally, unlike other methods, the present invention avoids the baggage of preprocessing and post processing operations.