FIELD: electronic data processing devices. SUBSTANCE: device has processing unit (CPU), bus, memory device (ROM, EEPROM), coding unit (VE), comparison unit (V) of stored private key code (Key 1, Key 2) with keyword (SW) entered by user, and switchgear (SE; MUX) enabling coding of data being entered and decoding entered data when comparison results are adequate. EFFECT: improved protection against unwanted memory access. 8 cl, 2 dwg
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