A method for carrying out of a secret code comparison in the case of a microprocessor-based portable data carrier

摘要

described is a method for implementing a geheimcodevergleiches for user identification in bearbeitungsvorgu00e4ngen with a mikroprozessorgestu00fctzten, portable device.the eeprom memory (electrically erasable programmable read only memory) and a data input and has datenausgabegeru00e4t (terminal) for communication with the portable device.with the user on the terminal in the portable device with the entered code stored secret code is comparedand with a wrong input secret code of a fehlbedienungszu00e4hler (fbz) in the eeprom of the portable data carrier by one level ordecreased, so that the portable device after a predetermined number of trial and error for a further communication is automatically locked.with the erfindungsgemu00e4u00dfen procedure prevents fraudulent manipulations.