Elektronische Datenverarbeitungseinrichtung und -system

摘要

The invention relates to an electronic data processing device comprising a processing unit (CPU) which is connected to at least one memory (ROM, EEPROM) via a bus. An encoding unit (VE) is assigned to the processing unit (CPU). At least one secret key (Key1, Key2) is stored in the memory or in one of the memories (ROM, EEPROM) and at least all security-relevant data is stored in the memory or memories (ROM, EEPROM) in encoded form. A comparator (V) for comparing the stored secret key (Key1, Key2) with a keyword (SW) to be entered by a user controls a switching unit (SE; MUX) controlling the encoding unit (VE), so that stored data can be decoded only if the comparison is positive.