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:
Sep. 25, 2001
Filed:
Jul. 26, 1999
Thomas S. Messerges, Schaumburg, IL (US);
Ezzat A. Dabbish, Cary, IL (US);
Larry Puhl, West Dundee, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An apparatus and method for preventing information leakage attacks on a microelectronic assembly is described for performing a cryptographic algorithm by transforming a first function, used by the cryptographic algorithm, into a second function. The method includes receiving (,) a masked input data having n number of bits that is masked with an input mask, wherein n is a first predetermined integer. The method also includes processing (,) the masked input data using a second function based on a predetermined masking scheme, and producing (,) a masked output data having m number of bits that is masked with an output mask, wherein m is a second predetermined integer.