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:
Aug. 01, 2006
Filed:
Sep. 15, 1999
Christophe Clavier, Gemenos, FR;
Olivier Benoit, Aubagne, FR;
Christophe Clavier, Gemenos, FR;
Olivier Benoit, Aubagne, FR;
GEMPLUS, Gemenos Cedex, FR;
Abstract
The invention concerns a countermeasure method in an electronic component using a secret key K cryptographic algorithm with sixteen computing cycles to supply an encrypted message (C) from an input message (M), each cycle using first means TCto supply an output information from an input information, Said method consists in applying by selection a sequence with the first means or another sequence with other means TC, TCto a group Gcomprising the first three cycles at least and another group Gcomprising the last three cycles at least. Whatever the sequence, the output result of the last cycle of each group is the same for the same input message (M).