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. 17, 2013
Filed:
Jan. 30, 2001
Applicants:
Mehdi-laurent Akkar, Gentilly, FR;
Paul Dischamp, Paris, FR;
Inventors:
Mehdi-Laurent Akkar, Gentilly, FR;
Paul Dischamp, Paris, FR;
Assignee:
Oberthur Card Systems SA, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/32 (2006.01); H04L 9/00 (2006.01); G06F 12/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
Perfected cryptographic protocol making it possible to counter attacks based on the analysis of the current consumption during the execution of a DES or similar. According to the invention, a message (M) is processed by two entities (A and B) and the entity (B) subject to attack executes a chain of operations known as DES in which it is chosen to carry out a given operation (O, O, O. . . O) or the same operation complemented (Ō, Ō, Ō. . . Ō), the choice being random.