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:
Oct. 21, 2008
Filed:
Oct. 29, 2002
Dieter Weiss, Munich, DE;
Dieter Weiss, Munich, DE;
Giesecke & Devrient GmbH, Munich, DE;
Abstract
In a method for controlled program execution by a portable data carrier, the value of a status counter (ZZ) is altered during execution of each controlled section (.x) of an executed program () in order to reflect the processing of the respective controlled section (.x); when executing a jump instruction (.x), which causes one or more controlled sections (.x) to be skipped, the value of the status counter (ZZ) is altered as if the skipped controlled sections (.x) had been executed and the value of the status counter (ZZ) is compared at at least one test point () with at least one admissible value. A portable data carrier has corresponding features. The invention provides reliable protection against manipulations of the portable data carrier and is also suitable for application in executing complex programs.