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. 30, 2008
Filed:
Jan. 20, 2000
Jean-sebastien Coron, Paris, FR;
Nathalie Feyt, Marseilles, FR;
Olivier Benoit, Aubagne, FR;
Gemplus, Gemenos, FR;
Abstract
A countermeasure method in an electronic component using a secret key algorithm K on an input message M executes an operation O(D) on input data D. A random value, of one first random information U, is generated that is of identical size as the input information D. A second random information V, is calculated by performing an exclusive OR operation between the input information and the first random information U. The operation Oor the sequence of operations are successively executed on the first input information U and to the second random information V, supplying respectively a first random result O(U) and a second random result O(V).