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:
Apr. 28, 2009
Filed:
Jun. 07, 2002
David Arditti, Clamart, FR;
Jacques Burger, Bieville Beuville, FR;
Henri Gilbert, Bures sur Yvette, FR;
Marc Girault, Caen, FR;
Jean-claude Pailles, Epron, FR;
David Arditti, Clamart, FR;
Jacques Burger, Bieville Beuville, FR;
Henri Gilbert, Bures sur Yvette, FR;
Marc Girault, Caen, FR;
Jean-Claude Pailles, Epron, FR;
France Telecom, Paris, FR;
Abstract
The present invention relates to a cryptographic method of protecting an electronic chip against fraud and a device including an electronic chip which is adapted to protect the electronic chip against fraud. The method includes: mixing some or all of the input parameters (E) to supply an output data item E'=(e′, e′, . . . , e′, . . . , e′), changing the state of a finite state automaton from an old state to a new state as a function of the data item E′=(e′, e′, . . . , e′, . . . , e′), and calculating a certificate (S) by means of an output function having at least one state of the automaton as an input argument. The device includes: mixing means, a finite state automaton, and output means for calculating a certificate (S).