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. 30, 2001
Filed:
Jul. 22, 1998
Robert I. Foster, Mesa, AZ (US);
John Michael Buss, Tempe, AZ (US);
Rodney C. Tesch, Phoenix, AZ (US);
James Douglas Dworkin, Chandler, AZ (US);
Michael J. Torla, Chandler, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A co-processor (,) executes a mathematical algorithm that computes modular exponentiation equations for encrypting or decrypting data. A pipelined multiplier (,) receives sixteen bit data values stored in an A/B RAM (,) and generates a partial product. The generated partial product is summed in a summer (,) with a previous partial product stored in a product RAM (,). A modulo reducer (,) causes a binary data value N to be aligned and added to the summed value when a particular data bit location of the summed value has a logic one value. An N RAM (,) stores the data value N that is added in a modulo reducer (,) to the summed value. The co-processor (,) computes the Foster-Montgomery Reduction Algorithm and reduces the value of (A*B mod N) without having to first compute the value of &mgr; as is required in the Montgomery Reduction Algorithm.