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:
Jun. 04, 2013
Filed:
May. 17, 1999
Applicants:
Harald Vater, Giessen, DE;
Hermann Drexler, Munich, DE;
Eric Johnson, Munich, DE;
Inventors:
Assignee:
Giesecke & Devrient GmbH, München, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/00 (2006.01); H04L 9/28 (2006.01); H04K 1/00 (2006.01); G06F 12/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a data carrier () having a semiconductor chip (). In order to prevent an attacker from determining secret data of the chip () from intercepted signal patterns of the chip (), security-relevant operations are performed only with commands or command strings of the operating program whose use does not permit the processed data to be inferred from the signal patterns.