1. A method for detecting living human skin, the method which comprises: providing a region of a skin surface close to at least one electric conductor by one of bringing the region of the skin surface in contact with the at least one electric conductor and providing the region of the skin surface at a given distance from the at least one electric conductor; applying one of an electric potential of a superimposition of frequencies and an electric AC voltage with a variable frequency to the at least one electric conductor; determining, with a measurement carried out with one of the electric potential and the electric AC voltage, an electric impedance as a specific function of one of time and frequency, by one of determining a real part and an imaginary part of the electric impedance and determining a frequency and an absolute value of the electric impedance; and checking whether the specific function corresponds to a reference function.