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:
Nov. 12, 2013
Filed:
Jun. 20, 2001
Christophe Bidan, Thorigne-Fouillard, FR;
David Naccache, Paris, FR;
Pierre Girard, La Destrousse, FR;
Pascal Guterman, Roquevaire, FR;
Ludovic Rousseau, Aubagne, FR;
Christophe Bidan, Thorigne-Fouillard, FR;
David Naccache, Paris, FR;
Pierre Girard, La Destrousse, FR;
Pascal Guterman, Roquevaire, FR;
Ludovic Rousseau, Aubagne, FR;
Gemalto SA, Meudon, FR;
Abstract
A method for preventing secret code manipulation in a data processing device, such as a smart card, to which a presented code is applied. Prior to implementation of a code transforming function in the processing device, the secret code is transformed into a transformed secret code in the card. For each use of the card, the presented code is transformed into a transformed presented code in accordance with the implemented transformation function. A comparison of the transformed secret code with the transformed secret code in the card is then performed.