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:
Jul. 19, 2011
Filed:
Sep. 09, 2003
Markus Bockes, München, DE;
Hermann Drexler, München, DE;
Helmut Kahl, München, DE;
Giesecke & Devrient GmbH, Munich, DE;
Abstract
In a method for protected execution of a cryptographic calculation in which a key with at least two key parameters is drawn on, an integrity check of the key is performed, in order to prevent a cryptographic attack in which conclusions are drawn as to at least one second key parameter by corrupting at least one first key parameter. A further method serves to determine a key for a cryptographic calculation with at least two key parameters provided for use in the first-mentioned method. A computer program product and a portable data carrier have corresponding features. The methods enable particularly good protection of cryptographic calculations against attacks.