Giesecke & Devrient Gmbh

Gao Gesellschaft Fur Automation Und Organisation Mbh

Wolfgang Effing

Wolfgang Rankl

Michael Lamla

Franz Weikmann

Stephan Spitz

Hermann Drexler

Ullrich Martini

Ulrich Kolzenburg

In a method for generating program code in a load format for a portable data carrier, a pseudo library is used, which differs from the library located on the data carrier in such a way that at least some of the internal workings of the library located on the data carrier are absent or hidden or masked in the pseudo library. In a method for providing executable program code in the portable data carrier, the program code in load format is linked relative to the library located on the data carrier. A device and a computer program product have corresponding features. The invention provides secure, privacy-safeguarding technology, which allows the generation of program code in a load format for a portable data carrier and the provision of executable program code in the portable data carrier.

Generation of a program code in a load format and provision of an executable program code

The invention relates to a method for testing the authenticity of a data carrier () and/or an external device () which enters into data exchange with the data carrier (). According to the invention, the data carrier () and the external device () are each equipped with a special additional apparatus () for generating and/or testing authenticity data. Data transmission between the data carrier () and the external device () as required for authenticity testing is performed at least partly via a special transmission channel (B). The transmission channel (B) for transmitting authenticity data is separated physically or logically from a transmission channel (A) for transmitting standard data so that there is no mutual interference of data transmission via the two transmission channels (A, B). In authenticity testing, the additional apparatuses for generating and/or testing authenticity data () of the data carrier () and external device () and optionally also the transmission channel (B) for authenticity data must meet special demands which cannot be met by conventional designs. The transmission channel (B) for transmitting authenticity data is activable during the total time period between activation and deactivation of the data carrier () so that authenticity testing can be performed anytime.

Data medium authentication method

Method for testing the authenticity of a data carrier

Method for testing the authenticity of a data carrier having an

The present invention relates to a data carrier arrangement having an integrated circuit (1) for obtaining of services, goods or the like, the integrated circuit (1) having at least one non-volatile data memory (2) with a predetermined number of memory cells which are readable, erasable and writable. In the data carrier arrangement described, the integrated circuit (1) has along with the data memory (2) a counter (3) consisting of a plurality of stages, and a control and security logic (4), the counter (3) being operable only in one predetermined direction, the size of the data memory (2) being selected such that its memory cells are adapted to the steps of the counter, and the control and security logic (4) controlling, among other things, the data transfer between the memory (2) and the counter (3) in such a way that before each use of the data carrier the current memory value is transferred to the counter and after use of the data carrier the memory content is updated with the new counter reading.

Data carrier arrangement having an integrated circuit

Growing community of inventors

Gilching, Germany

Wolfgang Effing