FIELD: manufacturing technology.
SUBSTANCE: invention relates to input devices. Input device has several functional keys and temperature changing module. Functional key may be controlled by means of pressing by finger tip touching appropriate working surfaces, and are used for input of authentication characters string. When authentication characters string shall be entered, temperature changing module changes temperature of several functional keys working surfaces so, that they are essentially equal.
EFFECT: technical result consists in prevention of illegal producing of characters strings for authentication using thermography.
16 cl, 25 dwg
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