Patent · US Expired

Method for testing the authenticity of a data carrier

US5850524A · kind A · utility

2Cited by

2References

26Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Michael Lamla · Birkenfeld, DE
Wolfgang Rankl · Frauenau, DE
Franz Weikmann · Plön, DE
Wolfgang Effing · Forstern, DE

Key dates

Filing date	Jul 15, 1996
Grant date	Dec 15, 1998
Priority date	—
Expiry date	Jul 15, 2016

Classification

Technology area (CPC H)Electricity
CPC primaryH01L2924/00014
WIPO fieldIT methods for management
WIPO sectorElectrical engineering

Abstract

A method for testing the authenticity of a data carrier having at least an integrated circuit with memory units and logic units as well as a data line for data exchange with an external device. The invention is characterized in that the integrated circuit additionally has a separate hard-wired circuit for transmitting and/or receiving data during the power-up sequence, which is used for authenticity testing, the first transmission or reception of data being completed within a defined time domain of the power-up sequence in which the data line has no defined state.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.