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. 06, 2010
Filed:
Dec. 23, 2005
Berndt Gammel, Markt Schwaben, DE;
Holger Bock, Graz, AT;
Michael Goessel, Mahlow, DE;
Infineon Technologies AG, Neubiberg, DE;
Abstract
A cryptographic unit includes a first processing unit for determining an output signal on the basis of the AES algorithm and for determining a first comparison signal, a second processing unit for determining a second comparison signal, and a release unit for providing the output signal, wherein the release unit is designed to perform a defense measure against an external tapping of the output signal when the first comparison signal is not related to the second comparison signal in a predetermined relationship. The first comparison signal is determined in a different way as compared to the second comparison signal, so that, in the case of the injection of faults into the cryptographic unit, these faults may be detected very easily.